Modern pollen dispersal studies in India: a detailed synthesis and review

Quamar, Md. Firoze; Kar, Ratan

doi:10.1080/01916122.2018.1557274

Cited by 32 publications

(22 citation statements)

References 108 publications

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“…Tropical deciduous forest elements (regional taxa), such as Syzygium, members of the subfamily Mimosoideae, Shorea and Acacia, appeared sporadically in the pollen spectra; this seems related to their entomophilous habit. The complete absence of other tropical deciduous forest elements (regional taxa), such as Terminalia, Emblica officinalis, Grewia, Mitragyna (Cannel and Smith, 1984;Duan et al, 2009;Cariñanos et al, 2014;Quamar, 2020;Quamar and Bera, 2014a, b;Quamar and Kar, 2020;Quamar et al, 2018a, b and relevant references therein). Ephedra sp., Dodonea sp., Croton sp., members of Acanthaceae, and Zizyphus sp.…”

Section: Discussion Inferences On the Modern Pollen Rain-vegetation Relationshipmentioning

confidence: 99%

“…An adequate understanding of the relationship between modern pollen assemblages and extant vegetation is needed for the confident use of fossil pollen records for reconstruction of vegetation and climate change (Moore and Webb, 1978;Faegri and Iversen, 1989;Birks and Berglund, 2018;Quamar and Kar, 2020 and references cited therein). However, the Fagerland effect (non-linearity of the modern pollen-vegetation relationship, i.e.…”

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confidence: 99%

“…there is no one-to-one relationship between modern pollen and extant vegetation; Fagerland, 1952) twists the basic assumption of that relationship. Furthermore, the uncertainties related with pollen production, dispersal and preservation of taxa of angiosperms and gymnosperms, the structure of the surrounding vegetation, and taxonomic resolution of pollen (Faegri and Iversen, 1964;Quamar and Bera, 2014a-c;Gaceur et al, 2017;Broothaerts et al, 2018;Bajpai and Kar, 2018;Quamar, 2020;Quamar and Kar, 2020 and references therein) add to the complexity of the problem. That non-linearity, taphonomic issues, and differential pollen production result in pollen percentages that are ambiguously related to the abundance of the corresponding plant species in the vegetation.…”

mentioning

confidence: 99%

“…Understanding that relationship and the accompanying uncertainties are key to interpreting the fossil pollen data, and can improve the quality of reconstructions and interpretations of past vegetation, landscape and climate (Chen et al, 2017). Much research on that relationship has been done on the Indian subcontinent in the most recent years Bera, 2014a, 2017;Quamar, 2017;Quamar and Kar, 2020 and references cited therein), but fewer such studies have been done in the Jammu region (Vishnu-Mittre and Robert, 1971;Sharma et al, 2001;Quamar and Srivastava, 2013;Quamar et al, 2018a, b;Quamar, 2020). To address this, we analysed the pollen of 35 surface soil samples in order to establish the relationship between extant vegetation and the modern pollen assemblage, and to provide data on the modern pollen-vegetation relationship useful for improving the interpretation of fossil pollen records from the Indian subcontinent on different spatio-temporal scales.…”

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confidence: 99%

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The modern pollen–vegetation relationship in Jammu, India: a comparative appraisal

Quamar¹,

Tiwari²,

Thakur³

2021

Acta Palaeobotanica

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An understanding of the relationship between modern pollen and vegetation is a prerequisite for reconstruction of vegetation and climate change from fossil pollen records. We conducted palynological studies of thirty-five surface soil samples from the Jammu region of India, which revealed that Pinus, among the conifers (regional needle-leaved taxa), is over-represented in the pollen assemblage due to its high production and effective dispersal of pollen. Other coniferous and broadleaved (regional and/or extra-regional) taxa have comparatively lower values in the pollen assemblages, similar to the representation of subtropical deciduous forest elements (regional), as well as shrubby (regional and/or extra-regional) taxa. This inconsistency in the pollen assemblage could be due to long-distance transport of the former by wind and/or water from the higher reaches of the Himalayas, and also because the latter have an entomogamous pollination syndrome and are not high pollen producers. The recovered pollen assemblage presents a distorted picture of the extant vegetation; hence, caution should be exercised in interpreting fossil pollen records from the study area. Principal component analysis (PCA) shows variability in the distribution of pollen from different sites in the Jammu region, perhaps the result of transport (by wind and/ or water), altitude and/or edaphic factors of the Himalayan terrain. The study should improve our understanding of the modern pollen-vegetation relationship and aid further calibration and interpretation of fossil pollen records.

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Section: Discussion Inferences On the Modern Pollen Rain-vegetation Relationshipmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

The modern pollen–vegetation relationship in Jammu, India: a comparative appraisal

Quamar¹,

Tiwari²,

Thakur³

2021

Acta Palaeobotanica

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“…The study area experiences both the Aw (Tropical savannah-type climate) and Cwg (Mesothermal-Gangetic Plain type climate) climates (Köppen, 1936; Quamar and Kar, 2020b). The nearest Climate Research Unit Timeseries (CRU TS) 4.01, 0.5 × 0.5 gridded climate data points, 1901–2018, showing the mean monthly precipitation and temperature (Supplemental Files 1a, b) around the site of investigation is shown in Figure 2 (Harris et al, 2014).…”

Section: Environment Of the Study Area: Geology Human Impact Vegetation And Climatementioning

confidence: 99%

Vegetation response to the Indian Summer Monsoon (ISM) variability during the Late-Holocene from the central Indian core monsoon zone

Quamar¹,

Kar²,

Thakur³

2021

The Holocene

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Pollen analysis and radiocarbon dating of a 1.4 m deep lacustrine sediment profile from Chhattisgarh State, central India, in the core monsoon zone (CMZ), has revealed the vegetation history, associated climate change and the Indian Summer Monsoon (ISM) rainfall variability during the Late-Holocene. The pollen evidence suggests that between ca. 3000 and 2600 cal year BP, tree-savannah vegetation occurred in the region having a comparatively lesser monsoon rainfall. The forest expanded and culminated into an open-mixed tropical deciduous forest between ca. 2600 and 2200 cal year BP under a warm and moderately humid climate with an increase in monsoon rainfall. Subsequently, between ca. 2200 and 2000 cal year BP, the existing open-mixed tropical deciduous forest transformed into a mixed tropical deciduous forest under a warm and humid climate with further increase in monsoon rainfall. Finally, between ca. 2000 and 1800 cal year BP, a dense mixed tropical deciduous forest occupied the landscape under a regime of a warm and relatively more humid climate with further strengthening of the ISM. The gradual warming, and the climatic amelioration with the intensification of the ISM, during the Late-Holocene (ca. 2600–1800 cal year BP; ~650 BC to AD150) corresponds to the Roman Warm Period (RWP), recorded globally between 2500 and1600 cal year BP (~550 BC to AD ~350). Human activities were present around the study area, which varied according to the ISM variations. The present study provides insights into the gradual intensification of the monsoon since the last ca. 2600 cal year BP (between ca. 2600 and1800 cal year BP), and an increase in the ISM strength in the CMZ of India, against the generally weakening trend during the Late-Holocene.

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Wetlands as Potential Zones to Understand Spatiotemporal Plant‐Human‐Climate Interactions

Misra¹,

Sharma²,

Maurya³

et al. 2022

Advances in Remote Sensing Technology and the Three Poles

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Modern pollen dispersal studies in India: a detailed synthesis and review

Cited by 32 publications

References 108 publications

The modern pollen–vegetation relationship in Jammu, India: a comparative appraisal

The modern pollen–vegetation relationship in Jammu, India: a comparative appraisal

Vegetation response to the Indian Summer Monsoon (ISM) variability during the Late-Holocene from the central Indian core monsoon zone

Wetlands as Potential Zones to Understand Spatiotemporal Plant‐Human‐Climate Interactions

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