Pollen and spores as proxies for palaeoenvironment reconstruction: A review of sediment-based research

Abstract

Studying pollen and spores preserved in sedimentary archives has emerged as a pivotal method for reconstructing past environments and understanding the long-term dynamics of Earth’s ecosystems. This study explores the utility of pollen and spores as proxies for palaeoenvironmental conditions, highlighting the methodological advancements in their extraction and analysis that have enhanced our ability to interpret historical climate and vegetation patterns. We can infer a wide range of ecological and climatic parameters through detailed sediment analysis, from shifts in vegetation communities and biodiversity to changes in hydrological cycles and fire regimes. These innovations provide a more comprehensive understanding of past biodiversity and ecosystem responses to climatic and anthropogenic changes. This study also discusses the implications of these findings for modern environmental management, including applications in climate change adaptation, biodiversity conservation, ecosystem restoration and sustainable land use planning. By integrating palaeoenvironmental insights into contemporary management practices, we can better predict and mitigate the impacts of current and future environmental changes, ensuring more resilient and sustainable ecosystems.

Keywords

Palaeoenvironment pollen analysis spore analysis sediment analysis proxy indicators

INTRODUCTION

Palaeoenvironmental reconstruction is a crucial scientific endeavour that enhances our understanding of the Earth’s climatic and ecological history (Dincauze, 1987; Bement et al., 2007; Youcef & Hamdi-Aïssa, 2014). Among the numerous methods used to reconstruct past environments, the analysis of pollen and spores preserved in sediments is particularly distinguished for its unparalleled robustness and effectiveness in providing detailed and reliable insights into historical climate and vegetation patterns (Webb & Bryson, 1972; Peyron et al., 2005; Mander & Punyasena, 2018). Pollen and spores, collectively known as palynomorphs, are microscopic reproductive structures produced by a wide variety of plants, including angiosperms, gymnosperms, ferns, and bryophytes (Stephen, 2014; Jain & Jain, 2020). These structures are encased in a highly resistant biopolymer called sporopollenin, which ensures their preservation in sediments over extensive geological timescales (Brooks & Shaw, 1978; Mackenzie et al., 2015; Li et al., 2019). This preservation potential makes them invaluable for reconstructing historical vegetation patterns and, by extension, the climatic conditions that supported such vegetation (Kui-Feng et al., 2022; Jardine et al., 2023).

Pollen grains are primarily produced by seed plants (angiosperms and gymnosperms) and are dispersed by wind, water or animals (Bedinger, 1992). On the other hand, spores are produced by ferns, mosses and other spore-producing plants and are typically dispersed by wind (Traverse, 2007a,b). Once released into the environment, these microscopic particles can settle in lakes, bogs, rivers and marine environments, incorporating them into the accumulating sedimentary record (Dark & Allen, 2005; Mander & Punyasena, 2018). By extracting sediment cores from these depositional environments, scientists can obtain a stratified archive of past biological activity (Wilke et al., 2016; Gregory-Eaves & Smol, 2024). Each layer of sediment represents a different period, allowing researchers to construct a chronological sequence of vegetative and climatic changes (Vescovi et al., 2007; Ellison, 2008; Moreno et al., 2012). The analysis of pollen and spores consists of multiple steps, each crucial for obtaining accurate and meaningful results (Figure 1a,b).

Figure 1.

(a) An overview of the pollen study framework. (b) Summary of the pollen and spore analysis method.

Pollen and spore assemblages provide a detailed record of past vegetation, which in turn reflects the prevailing climatic conditions (Pini et al., 2009; Andreev et al., 2011; Bonis & Kürschner, 2012; Mourelle & Prieto, 2016). Furthermore, changes in pollen assemblages over time can indicate climatic shifts. For instance, transitioning from forested pollen to grassland types might reflect a shift from a wetter to a drier climate (Prieto, 2000; Trondman et al., 2015). Additionally, the presence of certain indicator species, such as Artemisia (sagebrush) in arid regions or Alnus (alder) in wetland areas, can provide specific clues about past environmental conditions (Minckley et al., 2008; Aharonovich et al., 2014). In addition to natural climatic changes, pollen and spore records can reveal the impact of human activities on the environment (Kalis et al., 2003; Oldfield & Dearing, 2003). The introduction of agricultural species, such as cereals (e.g., wheat and barley), can be detected in the pollen record and indicates the onset of farming practices (Poska & Saarse, 2006; Josefsson et al., 2014). Similarly, increased charcoal particles alongside certain pollen types can point to anthropogenic fire activity, which has been used for land clearing and cultivation (Jiang et al., 2008; Lestienne et al., 2020). Numerous case studies have demonstrated the utility of pollen and spore analysis in paleo-environmental research (Carrión et al., 1998; Bement et al., 2007; Zhang et al., 2017; Trapote Forné, 2019; Ye et al., 2022; de Souza Celarino et al., 2013). For instance, in the study of Holocene climate variability, sediment cores from European lakes have provided detailed records of forest succession and climate oscillations (Magny, 2004; Kousis et al., 2018). Similarly, pollen analysis has been used in tropical regions to reconstruct the dynamics of rainforest expansion and contraction in response to climatic fluctuations (VanDerWal et al., 2009; Cheng et al., 2020).

In arid and semi-arid regions, pollen and spore analysis has shed light on past hydrological changes and desertification processes (Albert, 2015; Liu et al., 2016). For example, the analysis of sediments from the Sahara Desert has revealed periods of increased rainfall and vegetation cover, known as “Green Sahara” phases, interspersed with more arid conditions (Holz et al., 2007; Lanckriet et al., 2017; Nutz et al., 2024). Analysing pollen and spores preserved in sedimentary deposits is a powerful and versatile tool in palaeo-environmental research (Gavrilova et al., 2018). It directly links past vegetation and climate, enabling scientists to reconstruct detailed and nuanced pictures of historical ecological conditions (Mehrotra et al., 2024). Pollen is an ideal proxy for palaeoenvironmental reconstruction due to its durability, abundance and sensitivity to climate change. Its chemical stability allows for long-term preservation in sediments, while its diagnostic nature provides precise insights into past climates and vegetation (Willard & Ruppert, 2023). Pollen analysis is globally applicable and can be integrated with other proxies, making it a valuable tool for reconstructing past environmental conditions and understanding long-term ecological shifts (Chevalier et al., 2020).

As methodologies continue to advance and our understanding deepens, the study of pollen and spores will remain central to untying the complex interactions between climate, vegetation and human activity throughout Earth’s history (Steele & Warny, 2013). New molecular techniques and analytical methods have driven recent advancements in palaeoenvironmental research. Sedimentary ancient DNA (sedaDNA) analysis allows for precise investigations of past organismal responses to environmental changes (Armbrecht, 2020). Additionally, automated pollen identification systems have improved the accuracy and efficiency of reconstructing past climates. von Allmen et al. (2024) developed object detection and classification methods for fossil pollen, while Ota et al. (2024) introduced an automated technique for extracting and radiocarbon dating fossil pollen. These innovations demonstrate how molecular biology and automation enhance palaeoenvironmental studies’ resolution. This approach enhances our comprehension of past environments and informs predictive models of future climatic and ecological changes, underscoring the enduring relevance and importance of palaeo-environmental research.

OBJECTIVES

To examine the use of pollen and spores as proxies for palaeoenvironmental conditions.

To highlight advancements in extraction and analysis methods for pollen and spores.

To explore how these advancements improve historical climate and vegetation interpretation.

MORPHOLOGICAL CHARACTERISTICS AND SIGNIFICANCE

Taxonomic Identification of Pollens And Spores

A comprehensive examination of the morphological characteristics of pollens and spores is necessary for their taxonomic identification (Mander & Punyasena, 2014). Both categories are essential to the reproduction of fungi and plants, and species differences exist in their traits. Here, we provide a detailed explanation of the taxonomic classification of pollens and spores.

Pollen Identification

Pollen grains exhibit a variety of shapes, including elliptical, spheroidal, prolate, oblate or combinations thereof. Their size, measured in micrometres, varies significantly across plant species (Wortley et al., 2015). The outer layer of pollen, known as the exine, features apertures or openings, which play a crucial role in their identification (Muller, 1979). These apertures can be categorized into types such as colpate (furrow-like), porate (pore-like) and inaperturate (lacking apertures). The arrangement of these apertures is also important, with variations like tricolpate (three furrows) or monocolpate (single furrow) being standard identifiers (Walker & Doyle, 1975). The exine of pollen grains often exhibits characteristic ornamentation, such as reticulate (network-like), striate (lined) and rugulate (wrinkled) patterns. These features, along with the shape, aperture arrangement and exine structure (e.g., tricolporate, monosulcate), allow for the categorization of pollen into different groups (Milne & Martin, 1998). Additional layers may be present within the exine, which can be granular or exhibit various forms (Rowley, 1990). The lengths and widths of the colpi (furrows) on the pollen surface are also diagnostic features. Surface structures, such as thorns, spines or other features, can be critical for identification (Erdtman, 2023).

Spore Identification

Spores, like pollen, exhibit various forms, including ellipsoidal, tetrahedral and spherical shapes (Adeonipekun et al., 2021). Their sizes range from microscopic to large enough to be seen with the naked eye. Spores can also have unique ornamentation on their surfaces, such as smooth textures, spines, warts or ridges, and they come in different colours, including white, brown, black and others, with colour being a significant diagnostic feature (Calhim et al., 2018). The presence and type of apertures on the spore surface (equatorial, polar or germinal) provide additional taxonomic information (Punt et al., 2007). The outer layer of the spore wall, known as the sporoderm, varies in composition and structure between species, aiding in classification (Traverse, 2007a,b). Identification often relies on ornamentation patterns and surface details’ arrangement and shape (Jarzen & Jarzen, 2006). The initiation of spore germination via meiosis or mitosis is another important characteristic for classification (Brown & Lemmon, 2013). Advanced techniques, such as electron and light microscopy, are frequently used to evaluate these properties. Moreover, molecular techniques like DNA analysis are increasingly crucial for accurately identifying pollen and spores (Bell et al., 2016).

While the morphological characteristics of pollen and spores are fundamental to their identification, it is essential to understand their relationship with vegetation, as the composition of the surrounding plant community directly influences the pollen types present in sediments. Erdtman (1952) and Faegri and Iversen (1989) emphasised the importance of understanding the vegetation of the study area, as the types and abundance of pollen grains reflect the local flora and climatic conditions. The vegetation in a given region determines the types of plants that produce the pollen, and changes in this vegetation over time can offer valuable insights into past environmental conditions. Therefore, it is critical to have detailed knowledge of the vegetation of the study area to interpret pollen records accurately, as this relationship between vegetation and pollen is fundamental to reconstructing past climates and ecosystems.

Preservation of Pollens and Spores

Pollen and spore preservations are essential for researching palaeoclimates, historical habitats and plant evolution (Mander & Punyasena, 2018). The process involves preventing the deterioration and breakdown of these minuscule structures, with preservation conditions varying based on specific sedimentary contexts (Havinga, 1967; Wilmshurst & McGlone, 2005).

Preservation Factors and Process

Several environmental factors significantly influence the preservation of pollen and spores. Oxygen levels play a crucial role, as high oxygen conditions promote microbial activity, leading to decomposition (Condron et al., 2010). Conversely, anoxic environments, such as deep lake deposits or wetlands, inhibit microbial action, thereby aiding preservation (Jex et al., 2014). Fine-grained sediments like silts and clays are beneficial because they create a protective barrier against oxygen exposure, reducing the risk of organic material deterioration (Förstner, 2004). The pH of the environment also affects preservation; mildly acidic conditions can inhibit microbial growth and help preserve organic molecules, whereas alkaline conditions may lead to degradation (Langejans, 2010). Temperature is another critical factor; cold temperatures, typical of polar regions and high-altitude areas, help in the long-term preservation of pollen and spores (Seppä et al., 2002; Pini et al., 2017). The redox potential, which indicates oxygen availability, also affects preservation (Canfield, 1994). Low redox potential, characteristic of reducing conditions, helps preserve organic materials by minimizing oxygen availability (Krumbein & Garrels, 1952). Variations in water levels, such as those caused by lake level fluctuations or river flooding, can also influence pollen and spore deposition and preservation (Xu et al., 2016; Ge et al., 2021). Generally, consistent water levels are more conducive to preservation. Rapid burial of plant material in sediments protects from microbial activity and oxygen exposure, which is common in floodplains, marshes and lakes (Alexander et al., 1999; Burmeier et al., 2010).

The preservation process of pollen and spores begins with their deposition in sedimentary environments, facilitated by wind, water runoff or settling in lakes (McCarthy et al., 2021). Once deposited, the organic material is buried in sediments, where efficient burial minimises exposure to external elements (Willard & Ruppert, 2023). Over time, the accumulation of sediments leads to compaction, which protects the preserved material by creating a more stable environment (Liu et al., 2019). Following deposition, sediments undergo diagenesis, a series of physical and chemical changes that can transform organic material into more resilient forms, thus aiding in long-term preservation (Outridge & Wang, 2015; Bianchi et al., 2016). Under favourable conditions, the preserved material may undergo fossilisation, a process involving mineralisation or preserving organic structures in a more stable state (Briggs, 2003). As geological time progresses, sediments may lithify into sedimentary rocks, encasing and retaining pollen and spores (Potter et al., 2005). The careful preservation of these microscopic structures allows scientists, particularly palynologists, to extract valuable information from sedimentary cores about past ecosystems, climates and vegetation patterns. Technological advancements in analytical techniques, including molecular biology and palynology, have significantly enhanced the ability to examine and analyse these preserved materials (Abdelhady et al., 2024). By examining sedimentary cores, scientists—particularly palynologists—can extract critical information about past ecosystems, climates and vegetation patterns due to the meticulous preservation of pollens and spores.

Palaeoenvironmental Insights

Palaeobotanical studies enable scientists to identify the types of plants and vegetation present in a particular area during specific periods. The diverse morphologies of pollen and spores produced by different plant species allow for the reconstruction of ancient plant communities (Mander & Punyasena, 2014). For instance, pollen grain size, shape and surface ornamentation variations can distinguish between forested and grassland environments, revealing the vegetation composition of past ecosystems (Mander et al., 2013; Frazer et al., 2020). These detailed morphological characteristics are proxies for identifying plant species and understanding their historical distribution. By analysing the relative abundance and types of pollen and spores in sedimentary layers, researchers can infer the dominance of specific plant types and reconstruct vegetation’s spatial and temporal dynamics. This information is critical for understanding the ecological and evolutionary processes that have shaped current plant communities and their responses to environmental changes over geological timescales (Mander & Punyasena, 2014).

The relationship between climate and plant species distribution is often substantial, and pollen and spore assemblages serve as valuable indicators of past climatic conditions. By examining these assemblages, scientists can infer past temperatures, precipitation levels and other climatic variables (Seppä & Bennett, 2003). For instance, an abundance of grass pollen might indicate a drier climate, whereas the presence of pollen from specific tree species could suggest a warmer or wetter climate (Cariñanos et al., 2004). Pollen data, therefore, contribute to palaeoclimatology by helping reconstruct past climate variations and understanding their impact on terrestrial ecosystems (Wu et al., 2007; Xu et al., 2016). These reconstructions are essential for validating climate models and predicting future climate scenarios based on past trends.

Pollen and spore records are invaluable for tracking changes in vegetation over time. Shifts in pollen and spore assemblages can indicate natural processes such as succession, where ecosystems evolve from one type to another, like the transition from grasslands to forests or vice versa (Doyen & Etienne, 2017). These records can also identify anthropogenic changes, such as deforestation or agricultural practices, reflected in shifts from native vegetation to cultivated crops (Xiao et al., 2020). For instance, an increase in pollen from agricultural plants and a decrease in forest pollen can signal the onset of farming activities in a region (Marquer et al., 2014; Zhao et al., 2017). On the contrary, major natural events, such as wildfires, volcanic eruptions or meteorite impacts, leave distinctive marks in spore and pollen records (Pino et al., 2019). These events can cause abrupt changes in the composition of pollen and spore assemblages, which can be detected in sediment cores (Vajda et al., 2020). For instance, a sudden increase in charcoal particles alongside changes in pollen assemblages might indicate a wildfire event and its effect on local vegetation (Stähli et al., 2006; Chileen et al., 2020). Similarly, volcanic ash layers can correlate with shifts in plant communities due to the impact of volcanic eruptions (Arnalds, 2013; Ghermandi et al., 2015). These palaeoenvironmental records provide valuable information about natural disasters’ frequency, magnitude and ecological consequences. They also offer insights into how ecosystems have historically responded to such disturbances, contributing to our understanding of ecosystem resilience and the potential impacts of future natural events.

Additionally, shifts in pollen and spore assemblages in coastal sediments can reflect alterations in coastal vegetation and aid in reconstructing historical sea levels and coastal dynamics (García-Moreiras et al., 2019; Yang et al., 2019). The presence of pollen from salt-tolerant plants might indicate periods of higher sea levels, whereas an increase in freshwater plant pollen could suggest lower sea levels (Roe et al., 2005; Srivastava & Farooqui, 2017). Human activities, such as deforestation, urbanization and agriculture, significantly influence pollen records. Palynological research can reveal the extent and timing of human impacts on ecosystems (Franco-Gaviria et al., 2018; Ren et al., 2019; Ge et al., 2021). Moreover, the introduction of non-native species or the increase in pollen from agricultural plants can indicate periods of human settlement and land use changes (Kujawa et al., 2016). Furthermore, a decrease in forest pollen alongside an increase in grass or crop pollen can reflect deforestation events (Kaal et al., 2011). Variations in the abundance of specific plant species might reflect relationships with herbivores, such as grazing pressures or mutualistic associations with pollinators (Fowler et al., 2016; Rakosy et al., 2022). An increase in pollen from insect-pollinated plants could suggest periods of high pollinator activity, while a dominance of wind-pollinated plants might indicate a lack of pollinators (Labandeira et al., 2007). These biotic interactions are crucial for understanding the dynamics of ancient ecosystems and the evolutionary pressures that shaped plant traits and distributions (Cavender-Bares et al., 2016).

Pollen and spore assemblages are useful for dating sedimentary layers, providing a temporal framework for understanding the timing of environmental changes and events (Lowe & Walker, 2014; Jeffers et al., 2015). This biostratigraphic information is essential for correlating sedimentary sequences across different regions and reconstructing the chronological sequence of palaeoenvironmental events (Zhu et al., 2006). Moreover, palynological data are crucial for understanding how ecosystems have responded to past climate changes (Mercuri et al., 2013; Zhao, 2018). Advancements in quantitative palynology allow estimating vegetation cover and changes in plant abundance over time (Marquer et al., 2014). These techniques provide a more precise understanding of past ecosystems, enabling detailed reconstructions of historical vegetation dynamics and environmental conditions (Kapfer et al., 2017). By quantifying pollen data, researchers can assess the relative abundance of different plant species and reconstruct past vegetation landscapes more accurately (Dawson et al., 2016). This quantitative approach enhances our ability to detect subtle changes in plant communities, understand the drivers of these changes and predict future vegetation responses to environmental stressors (Thuiller et al., 2008). These detailed reconstructions are crucial for informing ecological restoration efforts, land use planning and biodiversity conservation in the face of rapid environmental changes.

A considerable number of research on pollen analysis and palaeoecological reconstruction has been conducted across various regions classified according to their climatic characteristics, encompassing temperate, subtropical and tropical zones (Horn et al., 1998; Gosling et al., 2009; Cheng et al., 2020). Pollen analysis in tropical regions poses unique challenges due to the high plant species diversity, complex vegetation structures and continuous or overlapping pollen production throughout the year. The variability in plant species and the difficulty distinguishing between similar-looking pollen grains from different species complicates the identification and interpretation of pollen spectra. However, despite these challenges, numerous studies have demonstrated the potential of pollen analysis in tropical environments, offering valuable insights into past climatic conditions and ecological dynamics. Horn et al. (1998) examined the feasibility of using soil pollen analysis to reconstruct vegetation and land-use history in the lowland humid tropics, finding that pollen records can be helpful even in these complex ecosystems. Researchers investigated modern pollen rain and its morphological features in the tropical western Malay Peninsula, providing a detailed understanding of how modern pollen spectra can infer past environmental conditions in the Sunda region (Cheng et al., 2020). Similarly, studies by Bush (1991) and Weng et al. (2004) highlighted the importance of modern pollen rain data from South and Central America and the elevational gradient in southern Peru, respectively, to refine palaeoenvironmental reconstructions in lowland tropical forests. The differentiation of neotropical rainforest, dry forest and savannah ecosystems through pollen spectra demonstrates how pollen analysis can distinguish between various tropical ecosystems (Gosling et al., 2009; Burn et al., 2010). Recent work by Julier et al. (2021) on modern pollen studies from tropical Africa has further underscored the potential of pollen analysis in paleoecology, emphasising its utility for reconstructing past climates and vegetation dynamics in tropical regions.

In temperate regions, the prevalence of pollen from tree species like oak (Quercus) and beech (Fagus) often indicates a warmer and more humid climate, while an abundance of grass (Poaceae) pollen typically suggests cooler or drier conditions associated with open, grassy landscapes (Connor, 2011; Leopold et al., 2014). Similarly, in subtropical areas, variations in pollen spectra can provide valuable insights into regional climate shifts, with tree and shrub pollen indicating changes in vegetation type and overall climatic conditions (Cariñanos et al., 2004; Whitney et al., 2011; Luo et al., 2016). Such studies emphasise the importance of understanding the regional vegetation to interpret pollen records for palaeoenvironmental reconstructions effectively.

India has substantially contributed to palynology and pollen analysis, significantly advancing our understanding of past climates, vegetation dynamics and anthropogenic impacts. Rawat et al. (2015) provided an in-depth analysis of Late Pleistocene–Holocene vegetation and Indian summer monsoon (ISM) records from the Lahaul region in the northwest Himalayas, highlighting key shifts in climate. Quamar and Kar (2020a) offered a comprehensive overview of prolonged warming over the last 11,700 years, using pollen evidence to track climatic changes within the central Indian Core Monsoon Zone. In their subsequent work, Quamar and Kar (2020b) synthesised modern pollen dispersal studies across India, comprehensively reviewing regional variations in pollen movement and dispersal mechanisms. Kar and Quamar (2020) extended this work by examining Late Pleistocene–Holocene vegetation and climate change in the Western and Eastern Himalayas, further elucidating regional environmental fluctuations. Quamar and Kar (2022) critically appraised agricultural practices during the Holocene, using pollen data to assess the impact of human activity on vegetation patterns. Research from northeastern India highlights climatic and environmental changes across time. Mehrotra et al. (2022, 2024) documented Holocene vegetation shifts and modern pollen patterns influenced by climate and human activity. Using multi-proxy data, Prasad et al. (2018) reconstructed vegetation and climate dynamics during the Paleocene–Eocene transition. Research in the Ganges–Brahmaputra–Meghna floodplain and the Central Ganga Plain highlights past and modern environmental dynamics. Kumar et al. (2019) examined modern alluvial pollen distribution, emphasising its significance for palaeoenvironmental studies. Misra et al. (2020) used biotic proxies to reveal millennial-scale vegetation and climate changes during the Early to Mid-Holocene. Farooqui et al. (2023) studied hydroecology and climatic variability since ~4.6 ka through palynological and sedimentological analyses in the Central Ganga Plain. Research from India’s coastal regions highlights vegetation, sea-level changes and environmental shifts during the Holocene. Srivastava et al. (2021) reconstructed late-Holocene vegetation diversity near Karwar, southwest India. Mohapatra et al. (2021) inferred Holocene sea-level changes and climatic history from the Cauvery delta. Naik (2021) analysed pollen to study palaeoenvironmental changes in Konkan’s archaeological deposits. Nageswara Rao et al. (2020) detailed the Holocene sea-level history on the east coast, while Narayana et al. (2017) examined sediment records from a palaeodelta on the southwest coast. Rajmanickam et al. (2017) traced the early Holocene to modern environmental shifts in Kukkal Lake, Southern India.

Additionally, Quamar et al. (2021) investigated the vegetation response to variability in the ISM during the Late Holocene, offering key insights into the complex relationship between monsoonal shifts and vegetation. In a recent study, Quamar et al. (2024a) analysed ISM variability in the central monsoon zone since the Last Glacial Maximum (LGM), linking more decisive phases (e.g., Medieval Climate Anomaly, Current Warm Period) and weaker ones (e.g., Dark Age Cold Period, Little Ice Age) to vegetation and climate dynamics. Moreover, Quamar et al. (2024c) analysed the abundance of Pinus L. pollen to reconstruct Holocene palaeoclimate conditions in the Himalayas, contributing to the broader understanding of climate history in the region. In the Western Ghats, Quamar et al. (2023) studied hydro-climatic variability and vegetation response during CE 1219–1942, further expanding the knowledge of past climatic and ecological conditions. Kar et al. (2022) provided a high-altitude calibration set of modern biotic proxies from the Western Himalayas, emphasizing the significance of pollen–vegetation relationships and their palaeoclimatic and anthropogenic implications. In a related study, Quamar et al. (2024b) examined modern pollen and non-pollen palynomorphs from sub-tropical central India, discerning anthropogenic signals in surface pollen assemblages. Prasad et al. (2024) focused on the Late Holocene vegetation history and monsoonal climate changes from the Core Monsoon Zone of India, contributing to a refined understanding of long-term climatic trends. Finally, Mohanty et al. (2024) studied sediments from the Hamtah Glacier outwash plain, Lahaul-Spiti, India, revealing climate shifts over 1580 years. Pollen ratios (AP/NAP) indicated cold-arid phases (AD 370–620, DACP; AD 1000–present) and warm-moist periods (AD 620–1000, MCA; AD 1160–1270). Recent warming over 160 years marks the Current Warm Period (CWP). Sediment analysis supports these findings of extended cold phases and brief warm periods. Collectively, these studies highlight the critical role of palynology in reconstructing past environmental conditions and underscore the importance of Indian research in the global palynological landscape.

UTILIZING MICROFOSSILS AS ENVIRONMENTAL INDICATORS

Microfossils, which include pollen, spores, diatoms, foraminifera and ostracods, are invaluable tools in palaeoenvironmental research (Williams et al., 2017; McCarthy et al., 2021). Due to their small size, abundance and diverse range, they are preserved in various sedimentary environments, providing detailed records of past ecological and climatic conditions (Daniau et al., 2019; Yasuhara et al., 2017).

Palaeoclimate, Vegetation Dynamics and Sediment Analyses in Palaeoenvironmental Research

Microfossils are essential proxies for reconstructing past climates and understanding vegetation dynamics over geological timescales (Ouellet-Bernier & de Vernal, 2018). Pollen and spores, for instance, provide direct evidence of past vegetation and indirectly infer climatic conditions (Xu et al., 2016). Pollen grains from various plant species are often distinct in morphology, allowing for precise identification and correlation with specific vegetation types (Mander & Punyasena, 2014). Researchers can reconstruct historical plant communities by analysing pollen assemblages in sediment cores and infer climatic conditions that prevailed at different times (Seppä & Bennett, 2003). For example, pollen from temperate tree species can indicate warmer and wetter climatic conditions, while an abundance of grass pollen might suggest cooler and drier environments (Cariñanos et al., 2004). Additionally, the analysis of diatoms and foraminifera, which are sensitive to changes in water temperature, salinity and nutrient levels, provides insights into past aquatic environments and climate conditions (Benito, 2020). These microfossils are particularly useful for reconstructing coastal, lacustrine, and marine paleoclimates. Furthermore, microfossil analysis can reveal vegetation succession patterns and changes over time (Gałka et al., 2017). For instance, shifts in pollen assemblages can indicate transitions from forested landscapes to open grasslands or vice versa, reflecting broader ecological changes driven by climatic fluctuations or anthropogenic influences (Doyen & Etienne, 2017).

Sediment analysis, combined with microfossil examination, is a fundamental approach in palaeoenvironmental research (Maher et al., 2012; Telford, 2019). Sediments archive past environmental conditions, capturing and preserving microfossils that settled from the surrounding environment (Bentley et al., 2011; Mather, 2011). Through the stratigraphic analysis of sediment cores, scientists can reconstruct a chronological sequence of environmental changes (Ellison, 2008; Dusar et al., 2011). Microfossils such as diatoms, foraminifera, and ostracods are particularly useful in sediment analysis because they provide information about the depositional environment and broader climatic conditions (Horne et al., 2012; Benito, 2020). For example, the species composition of diatom assemblages can reveal past water chemistry, including pH, salinity and nutrient levels, which are influenced by climatic and environmental factors (Battarbee & Charles, 1986). Similarly, foraminifera and ostracods are sensitive to changes in water temperature, salinity and oxygen levels, making them excellent indicators of marine and coastal environmental conditions (Murray, 2006). In palaeoenvironmental research, sediment cores are extracted from various settings, including lakes, wetlands, estuaries and ocean floors (Sonnenburg et al., 2013). These cores are then subjected to detailed stratigraphic analysis, where each sediment layer is examined for its microfossil content. Radiometric dating techniques, such as radiocarbon dating, are often used to establish a chronological framework for the sediment core, allowing researchers to correlate microfossil data with specific periods (Walker & Lowe, 2007).

Integrating microfossil analysis with sedimentological data provides a comprehensive understanding of past environmental conditions (Yasuhara, 2017). For instance, changes in sediment grain size, organic content and geochemical composition, combined with shifts in microfossil assemblages, can indicate alterations in depositional environments, such as transitions from lacustrine to fluvial settings or marine transgressions and regressions (Wilkinson et al., 2014; Berndt et al., 2019). This holistic approach enables scientists to reconstruct detailed environmental histories and understand the processes driving sediment deposition and preservation.

SEDIMENTARY ARCHIVES AS HISTORICAL RECORDS

Sedimentary archives are invaluable for reconstructing Earth’s historical records, providing insights into past environmental conditions, climatic changes and ecological dynamics (Dearing, 2013). These archives, found in various depositional environments such as lakes, oceans, wetlands and riverbeds, preserve layers of sediments that accumulate over time (Francke et al., 2020). Each layer encapsulates a snapshot of the environment during deposition, including physical, chemical and biological indicators.

Sediment Core Collection and Chronology

Collecting sediment cores is critical in accessing sedimentary archives (Glew et al., 2021). This process involves extracting cylindrical sections of sediments from various environments using specialised coring equipment. The choice of coring technique depends on the sediment’s nature and the research objectives. Standard methods include piston coring, gravity coring and freeze coring, each designed to minimise disturbance and preserve the integrity of the sediment layers (Skilbeck et al., 2017; Tommasi et al., 2019; Tuit & Wait, 2020). Once collected, the sediment cores are transported to laboratories undergoing detailed stratigraphic analysis (Paola et al., 2001). The first step is establishing a chronological framework for the sedimentary sequence, which is crucial for interpreting the temporal dynamics of past environmental changes. Various dating methods are employed to achieve this, including radiometric dating techniques, such as radiocarbon dating, optically stimulated luminescence (OSL) dating and lead-210 dating (Brown, 2011; Banerji et al., 2022). Radiocarbon dating is particularly useful for sediments up to about 50,000 years old, as it measures the decay of carbon-14 in organic material. OSL dating, on the other hand, estimates the time since mineral grains were last exposed to light, making it suitable for older sediments.

In addition to radiometric methods, relative dating techniques such as tephrochronology and biostratigraphy are also used. Tephrochronology involves identifying and correlating volcanic ash layers (tephra) within sediment cores, which serve as time markers (Daga et al., 2010; Lane et al., 2017). Biostratigraphy relies on certain microfossils, such as diatoms and foraminifera, whose known evolutionary timelines help date the sediment layers (Agnini et al., 2017; Weber & Jutson, 2022). Combining these dating techniques provides a robust chronological framework, enabling researchers to place past environmental events in a temporal context.

Analysing Pollen and Spore Fossils From Sediments

Analysing pollen and spore fossils preserved in sedimentary archives offers valuable insights into past vegetation, climate conditions and ecological dynamics (Goñi, 2022; Mander & Punyasena, 2014). Pollen and spores are resilient microfossils that can endure long-term burial and provide a continuous record of plant life over time (Ellison, 2008). The analysis begins with carefully extracting pollen and spore grains from sediment samples. This process involves several steps, including chemical treatments to remove mineral components and organic matter, then sieving and centrifugation to concentrate the microfossils (Green & Green, 2001; Coil et al., 2003). Once isolated, the pollen and spore grains are mounted on microscope slides and examined using light microscopy (Jones & Bryant, 2007). Scanning electron microscopy may also be employed for detailed morphological studies (Wacey et al., 2017). Identification of pollen and spores relies on their distinct morphological features, such as shape, size, aperture type and surface ornamentation (Pospiech et al., 2021). Reference collections and pollen atlases are essential for accurate identification and classification (Campos et al., 2021).

Quantitative analysis involves counting the number of pollen and spore grains from different plant species within a given sample (Jones & Bryant, 2007). This data is used to reconstruct past vegetation assemblages and infer climatic conditions. For example, high proportions of pollen from tree species may indicate forested conditions, while an abundance of grass pollen might suggest open, grassy landscapes (Bush, 2002; Kennedy et al., 2005). Changes in pollen assemblages over time can reveal shifts in vegetation due to climatic fluctuations or human activities (Zhao et al., 2017; Yong et al., 2020). Furthermore, pollen and spore data can be used to interpret broader ecological changes. For instance, an increase in crop pollen can signal the onset of farming practices, while a decline in forest pollen might indicate deforestation (Harvey et al., 2021). These insights are essential for understanding the interactions between climate, vegetation and human activities over long periods.

In addition to light microscopy, advances in molecular techniques, such as DNA analysis of sedaDNA, are enhancing the resolution of pollen and spore studies (Armbrecht, 2020). SedaDNA provides genetic information about past plant communities, offering a complementary approach to traditional morphological analysis (Selway et al., 2022; Nguyen et al., 2023). The integration of pollen and spore analysis with other palaeoenvironmental proxies, such as charcoal particles (indicating fire activity), diatoms (reflecting aquatic conditions) and isotopic data (providing climatic information), allows for a comprehensive reconstruction of past environments (Daniau et al., 2019; Schiller et al., 2023). This multi-proxy approach enriches our understanding of historical ecological and climatic dynamics, contributing valuable knowledge to palaeoclimatology, archaeology and conservation biology.

METHODOLOGICAL ADVANCES IN EXTRACTION AND ANALYSIS

Recent Breakthroughs in the Last Decade

In the last decade, significant advancements have been made in extracting and analysing pollen and spore fossils from sedimentary archives, enhancing our ability to reconstruct past environments with greater precision and accuracy (Table 1). These methodological breakthroughs have improved palaeoenvironmental reconstructions’ efficiency, resolution and reliability. One significant advancement is the development of improved chemical extraction techniques that enhance the recovery and preservation of delicate pollen and spore grains from sediments.

Table 1.

Recent advancements in pollen and spore fossil analysis.

Key Contributions	References
Developed CNNs for automated fossil pollen analysis, achieving high accuracy in replicating pollen patterns with potential for broader application.	Allmen et al., 2024
Introduced the ‘orderly count’ method for accurate vegetation composition analysis in fossil pollen, emphasizing the need for tailored methodologies.	Yaman et al., 2024
Developed a method using a flow cytometer for extracting larger pollen grains for radiocarbon dating, reducing the number of grains needed and improving efficiency.	Ota et al., 2024
Created a method for high-purity pollen and spore concentrates, improving radiocarbon dating accuracy in lacustrine sediments, addressing discrepancies in dating due to pollen and spore concentrations.	Steinhoff et al., 2022
Proposed the LUP index for quantifying human impact on ecosystems using cultural indicator pollen types, validated with independent datasets, enhancing Holocene land-use reconstructions in Europe.	Deza-Araujo et al., 2022
Reclassified fossil species, highlighted the role of melanins in fungal spore preservation, and discussed their use as biomarkers in palaeoecological studies.	Otaño et al., 2022
Introduced an on-chip sorting method using microjet flows for high-throughput sorting of large particles, useful for various scientific applications and paleoenvironmental research.	Kasai et al., 2021
Developed an extraction and radiocarbon dating method for fossil pollen grains, focusing on organic-rich sediments, enhancing precision in age models.	Yamada et al., 2021
Proposed an acid-free fossil pollen processing method, using non-toxic substances, offering an environmentally friendly alternative to traditional methods.	Santos and Ledru, 2021
Introduced Airyscan confocal superresolution microscopy for high-resolution imaging of pollen grains, providing detailed morphological analysis with less processing time than electron microscopy.	Romero et al. (a), 2020
Combined superresolution microscopy with machine learning to classify fossil pollen, achieving high accuracy and supporting hypotheses on the biogeographic history of the Amherstieae tribe.	Romero et al. (b), 2020
Proposed a method integrating surface soil and lake sediment pollen data using PCoA for accurate paleoclimate reconstructions, providing consistency with modern observations.	Sun et al., 2020
Explored safer alternatives to hydrofluoric acid in pollen analysis, using sodium polytungstate and lithium heteropolytungstate for dense media separation, highlighting some discrepancies due to sample-specific factors.	Leipe et al., 2019
Investigated UV-B radiation’s impact on biological processes, using proxies to reconstruct past UV-B irradiance, advocating for an interdisciplinary approach to resolve uncertainties.	Seddon et al., 2019
Combined data from algal pigments and sedaDNA to assess fossil algae, reconstructing algae turnover rates over 14,500 years, emphasizing the integration of multiple data sources.	Stivrins et al., 2018
Introduced a method for quantitative paleoclimate reconstructions focusing on significant environmental variables influencing fossil pollen, improving accuracy in past precipitation trends.	Chen et al., 2017
Used spatial analysis to study taphonomic factors in the palynological record at La Draga, revealing environmental and activity patterns, highlighting spatial analysis in archaeopalynology.	Revelles et al., 2017

Notes: CNN, convolutional neural networks; LUP, land use probability; PCoA, adjustment for confounding factors using principal coordinate analysis.

Automated pollen identification systems and advanced imaging techniques are transforming the field by enabling large-scale, high-resolution, previously impractical studies (Bell, 2016; 2022). These technologies facilitate more extensive spatial and temporal analyses, helping to identify regional and global patterns in vegetation change. The increased speed and accuracy of pollen identification also enhance the potential for real-time monitoring of current environmental changes, providing valuable data for conservation and management efforts (Crouzy et al., 2016; Sauvageat et al., 2022). Future directions in this field will likely focus on further integrating these advanced methodologies to develop holistic approaches for environmental reconstruction. For instance, combining sedaDNA analysis with isotopic studies and microcharcoal analysis could provide a more nuanced understanding of past fire regimes, nutrient cycling and climate-vegetation interactions (Duxbury et al., 2021; Dharmarathna et al., 2021). Additionally, the continued development of machine learning algorithms and big data analytics will likely improve the precision and scalability of palaeoenvironmental research, enabling the synthesis of vast datasets from multiple sources.

Another promising direction is the application of these advanced techniques to understudied regions and time periods, filling gaps in the global palaeoenvironmental record (Heikkilä et al., 2022; Thompson, 2022). By expanding the geographical and chronological scope of studies, researchers can better understand past global environmental changes and their impacts on biodiversity and human societies. Finally, these methodological advancements hold significant potential for education and outreach. By making palaeoenvironmental data more accessible and engaging through digital platforms and interactive visualizations, researchers can better communicate the importance of historical perspectives in understanding current and future environmental challenges. Moreover, substantial technological advancements in the field, facilitated by AI systems, which have shown promising accuracy in identifying microfossil taxa (Marret, 2023; Yan et al., 2022).

CONCLUSIONS

Through reconstructing past ecosystems, palaeoenvironmental studies provide critical insights into Earth’s historical climate and ecological dynamics. By analysing proxies like pollen, spores, diatoms and sedimentary DNA, researchers can infer biodiversity, climate conditions and ecological processes over time. These reconstructions help understand ecosystem resilience to natural and anthropogenic changes, informing conservation efforts by identifying vulnerable species and ecosystems. Additionally, they provide context for distinguishing natural climate variability from human-induced changes, guiding modern environmental management. Insights from past climate variability can inform climate adaptation strategies, improve water resource management and shape fire and land use planning. Integrating palaeoenvironmental data into contemporary management enhances the sustainability of conservation and restoration efforts, underscoring the importance of interdisciplinary research to address modern environmental challenges.

Despite the valuable insights provided by pollen and spore analysis for paleo-environmental reconstructions, several limitations exist. Taphonomic biases can affect the preservation of palynomorphs, especially in tropical and subtropical regions, leading to incomplete or distorted records. The pollen–vegetation relationship can be confounded by long-distance transport and the uneven pollen distribution among plant species, complicating local vegetation interpretation. Additionally, modern analogs may not always be applicable due to shifts in species distributions and anthropogenic influences. Analytical challenges, such as the labour-intensive extraction process, taxonomic identification errors and low temporal resolution, further limit the accuracy of the reconstructions. To mitigate these issues, pollen data are often combined with other proxies for a more comprehensive understanding of past environments.

Pollen and spore analysis has significantly advanced our understanding of past climates and ecosystems, especially when examining global climatic events from the LGM to the present. The LGM, marked by a global cooling phase, has been pivotal in reconstructing late Pleistocene vegetation patterns, providing valuable insights into climate dynamics and ecosystems during this time. Following this, the Holocene witnessed significant climatic shifts, including the transition to warmer conditions, the onset of the Neolithic Agricultural Revolution and, more recently, anthropogenic climate change. These key events have shaped vegetation development across various regions, with pollen records serving as essential proxies in tracking these transformations.

Future directions in pollen analysis should focus on integrating high-resolution palaeoclimatic studies, allowing for more precise reconstructions of climate and vegetation over finer temporal scales. Additionally, advancements in molecular techniques such as DNA barcoding and isotopic analysis could provide further insights into the diversity and evolution of past plant communities, complementing traditional palynological methods. There is also a growing need for more regional-scale pollen databases to address spatial variations and improve the accuracy of reconstructions. Given the increasing impact of climate change, future research should also focus on understanding the resilience and adaptability of vegetation to extreme climatic events, including droughts, heatwaves, and shifting monsoonal patterns. Lastly, expanding the integration of palynological data with other proxies, such as geomorphological and archaeological evidence, could enhance our ability to reconstruct past climates and the broader human–environment interactions that have shaped the modern world. In sum, while pollen analysis has come a long way in reconstructing paleo-environments, continued technological advancements and interdisciplinary approaches will be crucial for advancing this field.

Footnotes

Acknowledgement

The authors would like to thank the Head of the Department of Geology at the University of Madras, Guindy Campus, Chennai 600025, India for extended support and guidance.

Author Contributions

Mohammad Abass Zargar: conceptualization, literature review, writing—original draft; Muzafar Riyaz: writing–original draft, writing—review & editing, validation, conceptualization; Shaik Mohammad Hussain: supervision, validation, review & editing; Arfat Nazir: writing—original draft, conceptualization; Saima Hamid: literature review, writing—review & editing; Ishfaq Ahmad Gojree: literature review, writing—original draft; Khursheed Ahmad Parray: supervision, literature review, writing—review & editing.

Statements and Declarations

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Declaration of Conflicting Interest

The authors declared no potential conflicts of interest regarding the research, authorship and/or publication of this article.

Funding

The authors received no financial support for the research, authorship, and/or publication of this article.

ORCID iD

MOHAMMAD ABASS ZARGAR

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