Pollen evidence for Late Pliocene – Early Pleistocene vegetation and climate change in the North Caucasus, North-Western Caspian Region

Naidina, O. D.; Richards, Keith

doi:10.1016/j.quaint.2015.12.018

Cited by 27 publications

(9 citation statements)

References 14 publications

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“…8). The latter is situated along the route of the former 'Turgay Seaway' that connected the Arctic and Tethyan Oceans during the Paleogene (Akhmetiev et al, 2012;Naidina and Richards, 2016) and formed part of a route from the north towards the Aral Sea in the late Pleistocene (Mangerud et al, 2004). No firm evidence, however, is currently known from the literature that pinpoints a precise location for an arctic to Caspian gateway, despite a long research history on this subject, especially in Russia.…”

Section: Mechanism?mentioning

confidence: 99%

“…Previous palynological studies of the late Pliocene to early / middle Pleistocene of the Caspian Sea region (e.g. Filippova, 1997;Naidina, 1999;Yakhimovich et al, 2000;Naidina and Richards, 2016) are essentially pollen and spore based. These, therefore, give limited interpretations in that inferred environmental or climatic changes are based only on terrestrial vegetation.…”

Section: Introductionmentioning

confidence: 97%

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Palynology and micropalaeontology of the Pliocene - Pleistocene transition in outcrop from the western Caspian Sea, Azerbaijan: Potential links with the Mediterranean, Black Sea and the Arctic Ocean?

Richards

Baak

Athersuch³

et al. 2018

Palaeogeography, Palaeoclimatology, Palaeoecology

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New palynological, ostracod and foraminiferal data are presented from a long outcrop section in the Jeirankechmez river valley, Azerbaijan, near the western coast of the Caspian Sea. The interval studied includes the upper part of the Pliocene Productive Series and overlying Plio-Pleistocene Akchagylian (Akchagyl) and Apsheronian (Apsheron) regional stages. Productive Series sediments were deposited in a closed fluvio-lacustrine basin, isolated from any marine influence. The onset of Akchagyl deposition is marked by a lithological change associated with a significant flooding event that, at its maximum extent, reached the Sea of Azov and into present-day Iran, Kazakhstan, Turkmenistan and Russia. At the Jeirankechmez locality, the lowermost beds of the Akchagyl contain predominantly freshwater assemblages with very minimal marine or brackish content showing that the onset of Akchagyl deposition was not a marine induced event. Reworked Mesozoic palynomorphs occur frequently in this lowermost interval, including the reworked pollen taxa Aquilapollenites-Triprojectus that were eroded from the north or northeast. Significant marine influence is evident ca. 30 m above the base of the Akchagyl in the studied outcrop, marked by the 'Cassidulina Beds' which contain a distinct but low diversity assemblage of foraminifera that occurs widely and can be correlated in many parts of the greater Caspian region. Dinoflagellate cysts (dinocysts) in the marine interval include frequent specimens very similar to Algidasphaeridium capillatum (Matsuoka and Bujak), a species only previously recorded from the northern Bering Sea. The combined evidence from these dinocysts and foraminifera suggests that a marine (i.e. seaway) connection existed briefly between the Arctic Ocean and the Caspian Sea at the very end of the Pliocene. Re-examination of core material from the Adriatic Sea shows that Cassidulina reniforme (Nørvang) was present in the Mediterranean during and shortly after the Last Glacial Maximum. The possibility that the end Pliocene marine incursion came from the Mediterranean via the Black Sea region to the Caspian Sea cannot be entirely ruled out but is considered unlikely. Biometric analyses are applied to obtain a better understanding of the palaeoenvironmental significance of the assemblages dominated by cassidulinids. An interval more than 300 m thick is assigned to the Apsheron regional stage on the basis of predominantly brackish ostracod and dinocyst associations. The dinocysts are of 'Peri-Paratethyan' affinity and closely resemble species first described from Miocene and Pliocene sediments in the Pannonian and Dacic basins of Eastern Europe. Many similarities exist in the microplankton records (dinocysts and acritarchs) between the Caspian Sea, the Black Sea and Central Paratethys.

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Section: Mechanism?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Palynology and micropalaeontology of the Pliocene - Pleistocene transition in outcrop from the western Caspian Sea, Azerbaijan: Potential links with the Mediterranean, Black Sea and the Arctic Ocean?

Richards

Baak

Athersuch³

et al. 2018

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Examining how historical and contemporary ecological factors contribute to the demographic history and genetic differentiation of plants is a central question in ecology and evolution. Climatic oscillations have dramatically influenced the demographic history and patterns of genetic diversification in many plant species, particularly during the Pleistocene periods with more frequent glacial-interglacial cycles [1][2][3][4][5][6][7][8]. In Asia, at least four major glaciations are thought to have occurred, which likely affected its flora and fauna, although the glacial advances were not as extensive as that of Europe and North America.…”

Section: Introductionmentioning

confidence: 99%

Demographic history and genetic differentiation of an endemic and endangered Ulmus lamellosa (Ulmus)

Hou

Wang

et al. 2020

BMC Plant Biol

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Background Ulmus lamellosa (one of the ancient species of Ulmus) is an endemic and endangered plant that has undergone climatic oscillations and geographical changes. The elucidation of its demographic history and genetic differentiation is critical for understanding the evolutionary process and ecological adaption to forests in Northern China. Results Polymorphic haplotypes were detected in most populations of U. lamellosa via DNA sequencing. All haplotypes were divided into three phylogeographic clades fundamentally corresponding to their geographical distribution, namely THM (Taihang Mountains), YM (Yinshan Mountains), and YSM (Yanshan Mountains) groups. The YSM group, which is regarded as ancestral, possessed higher genetic diversity and significant genetic variability in contrast to the YSM and YM groups. Meanwhile, the divergence time of intraspecies haplotypes occurred during the Miocene-Pliocene, which was associated with major Tertiary geological and/or climatic events. Different degrees of gene exchanges were identified between the three groups. During glaciation, the YSM and THM regions might have served as refugia for U. lamellosa. Based on ITS data, range expansion was not expected through evolutionary processes, except for the THM group. A series of mountain uplifts (e.g., Yanshan Mountains and Taihang Mountains) following the Miocene-Pliocene, and subsequently quaternary climatic oscillations in Northern China, further promoted divergence between U. lamellosa populations. Conclusions Geographical topology and climate change in Northern China played a critical role in establishing the current phylogeographic structural patterns of U. lamellosa. These results provide important data and clues that facilitate the demographic study of tree species in Northern China.

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“…Climatic oscillations and related changes in vegetation can be recognized in the period from 3.6 to 0.8 Ma (Naidina & Richards, ). Multiple studies have showed that the climate oscillations especially in the glaciation cycles of the Quaternary may have facilitated speciation, diversification, hybridization, and changes in the distribution of the global vegetation (Liu et al., ; Shahzad, Jia, Chen, Zeb, & Li, ; Yamamoto, Ohtani, Kurata, & Setoguchi, ).…”

Section: Introductionmentioning

confidence: 99%

Phylogeography of two closely related species of Allium endemic to East Asia: Population evolution in response to climate oscillations

Yang

Zhou

Huang

et al. 2018

Ecology and Evolution

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This study investigated the effects of climate oscillations on the evolution of two closely related Allium species, A. neriniflorum and A. tubiflorum. We sequenced three cp DNA (cpDNA) fragments (rps16, rpl32‐trnL, and trnD‐trnT, together approximately 2,500 bp in length) of two closely related Allium species, with samples from 367 individuals in 47 populations distributed across the total range of these species. The interspecific and intraspecific divergence times of the two species were in the Quaternary glaciation. The population divergence was high for the cpDNA variation, suggesting a significant phylogeographic structure (NST = 0.844, GST = 0.798, p < 0.05). Remarkable ecological differentiation was also revealed by Niche models and statistical analyses. Our results suggest the speciation event of the two species was triggered by violent climatic changes during the Quaternary glaciation.

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Pollen evidence for Late Pliocene – Early Pleistocene vegetation and climate change in the North Caucasus, North-Western Caspian Region

Cited by 27 publications

References 14 publications

Palynology and micropalaeontology of the Pliocene - Pleistocene transition in outcrop from the western Caspian Sea, Azerbaijan: Potential links with the Mediterranean, Black Sea and the Arctic Ocean?

Palynology and micropalaeontology of the Pliocene - Pleistocene transition in outcrop from the western Caspian Sea, Azerbaijan: Potential links with the Mediterranean, Black Sea and the Arctic Ocean?

Demographic history and genetic differentiation of an endemic and endangered Ulmus lamellosa (Ulmus)

Phylogeography of two closely related species of Allium endemic to East Asia: Population evolution in response to climate oscillations

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