Non-pollen palynomorphs from the late Quaternary sediments of southwestern Madhya Pradesh (India) and their palaeoenvironmental implications

Quamar, Mohammad Firoze

doi:10.1080/08912963.2014.933212

Cited by 26 publications

(9 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This period (~1550–800 cal. yr BP) begins with a remarkable wide deforestation event, which led to a major expansion of grasslands, likely related to a drier climate, but also to an increase of temperature, as suggested by open water indicators (Cook et al, 2011; Quamar, 2015; Van Geel, 2001). They also point to an increasing seasonality against the more continuous water availability indicated by aquatic taxa (Amami et al, 2010; Oertli et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Are Cedrus atlantica forests in the Rif Mountains of Morocco heading towards local extinction?

et al. 2018

View full text Add to dashboard Cite

Cedrus atlantica (Atlas cedar) is a relict and endemic endangered species from northwestern African mountains, whose distribution range has undergone a dramatic reduction over recent decades. Long-term studies are needed for a better understanding of the development of its range as well as for assisting in the implementation of sustainable conservation measures. The multi-proxy analysis of a high-resolution fossil record of 180 cm depth allowed us to depict the final demise of an Atlas cedar population from the western Rif Mountains (Jbel Khesana), despite its high resilience during the last ~4000 years. Currently, Atlas cedar trees are not observed in Jbel Khesana but they still occur in the nearby area as scattered populations on a few mountain tops at altitudes higher than 1400 m a.s.l. Our data show an initial relatively stable period (~4000–2400 cal. yr BP) followed by a phase where both climatic and human-induced disturbances cause an alternate dominance of oaks and Atlas cedars (2400~1550 cal. yr BP). Then, the increasing aridity and human activities favoured the depletion of Atlas cedar forests (~1550–800 cal. yr BP). Our record shows that Atlas cedar forests have recovered after each deforestation event, which reveals a high resilience of the species until the mid-20th century, when they became extinct in the study area. The main driver of their local extinction may be attributed to the strong human pressure. Management measures of Atlas cedar in the Rif Mountains should aim at limiting intensive loggings and protecting the existing populations for their local regeneration.

show abstract

Section: Discussionmentioning

confidence: 99%

Are Cedrus atlantica forests in the Rif Mountains of Morocco heading towards local extinction?

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Identification of modern palynomorphs recovered from the surface soil, mud and moss-cushion samples was carried out through the consultation of reference slides available in the sporothek of Birbal Sahni Institute of Palaeobotany (BSIP), Lucknow, and the scant published literature related to pollen and non-pollen palynomorph study (Chauhan & Bera 1990;Nayar 1990;Bera et al 2009;Quamar 2014). Betweem 280 to 316 pollen grains were counted in each sample.…”

Section: Methodsmentioning

confidence: 99%

Modern pollen and its ecological relationships with the tropical deciduous forests of central Uttar Pradesh, India

Tripathi¹,

Arya

Basumatary³

et al. 2015

Palynology

View full text Add to dashboard Cite

“…The high percentages of Glomus may indicate local soil erosion (Medeanic and Silva, 2010). The presence of Glomus, Diplodia, Curvularia, Tetraploa, Nigrospora, Cookeina, Alternaria and Helminthosporium reflects warm and humid climate around the study areas (Quamar, 2015).…”

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

confidence: 98%

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

Quamar¹,

Tiwari²,

Thakur³

2021

Acta Palaeobotanica

View full text Add to dashboard Cite

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.

show abstract

Non-pollen palynomorphs from the late Quaternary sediments of southwestern Madhya Pradesh (India) and their palaeoenvironmental implications

Cited by 26 publications

References 22 publications

Are Cedrus atlantica forests in the Rif Mountains of Morocco heading towards local extinction?

Are Cedrus atlantica forests in the Rif Mountains of Morocco heading towards local extinction?

Modern pollen and its ecological relationships with the tropical deciduous forests of central Uttar Pradesh, India

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

Contact Info

Product

Resources

About