Review of Palaeobotany and Palynology最新文献

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Impact of the Younger Dryas dry event on equatorial forest ecosystems: Insight from Lake Child, Manengouba crater, Cameroon 小干纪干旱事件对赤道森林生态系统的影响：来自喀麦隆马嫩古巴火山口柴尔德湖的启示

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2024-11-14 DOI: 10.1016/j.revpalbo.2024.105237

A.-M. Lézine , B. Turcq , T. Desjardins , M. Mandeng-Yogo , F. Cetin , B. Tchiengué , G. Achoundong

This paper presents the pollen, microcharcoal and geochemical data generated by a sediment core extracted from Lake Child in the Manengouba massif of Cameroon (MAN-01: 5.02996 N, 9.822910E; 1948 m asl) covering the time interval between 15.4 and 9.6 ka. With an exceptional sedimentation rate of up to 13 cm per year, this record represents the highest resolution of the environmental changes that took place in the highlands of equatorial Atlantic Africa during the last deglaciation. Our study shows (1) that the Younger Dryas (YD) dry event consisted of two distinct phases: a dry phase between 12.8 and 11.7 ka followed by a wetter and colder phase between 11.7 and 11.3 ka; (2) that the Afromontane forest elements that were present during the last glacial period were replaced by sub-montane forest elements during the Holocene; (3) that vegetation and the hydrological environment have not always evolved in parallel: this was particularly the case at the YD/Holocene transition when the abrupt shift in hydrological conditions contrasted with the gradual spread of forests.

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引用次数: 0

Seeds Alapaja (Cupressaceae) from the Cretaceous of Western Siberia and their paleo-DNA 西西伯利亚西部白垩纪的Alapaja（濯缨草科）种子及其古DNA

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2024-11-10 DOI: 10.1016/j.revpalbo.2024.105236

A.A. Torshilova, I.A. Ozerov, N.A. Zhinkina, A.V. Rodionov

The article presents the results of cytoembryological research of the structure of fossil seeds in coniferous plants Alapaja cf. uralensis (Cupressaceae) from the Cenomanian–Turonian deposits of Western Siberia (age about 91.5 ± 8.5 Mya), and the results of the Feulgen test for the preservation of their structures' paleo-DNA in the nuclei. The study revealed the presence of fragments of embryo, megagametophyte and nucellus in the seed. The presence of megaspore membrane was also identified in the seed. The seed coat is 2–3-layered, the upper layer is very thin and presents just partially, and the middle layer of testa is represented by sclerotesta, the lower layer cells are fused into a single mass. It was established that nuclei are present in the cells of the embryo, megagametophyte and nucellus, however, in most cases, the DNA-deoxyribose skeleton, serving as a target for the Schiff reagent during the Feulgen reaction, is not cytologically detected in the nuclear chromatin. Only in two cases: in fragments of presumably embryonic tissue and megagametophyte, nuclei with a positive reaction according to Felgen were found, which indicates the preservation of aldehyde groups of deoxyribose in the nuclei of its individual parts.

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引用次数: 0

Phytolith spectra of the monotypic grass Danthonidium gammiei (Bhide) Hubb. in Hook. (Danthonioideae) from Northern Western Ghats, India: Taxonomic and environmental significance of its distinctive Bilobates 印度北部西高止山单型草 Danthonidium gammiei (Bhide) Hubb. in Hook.(Danthonioideae)：其独特双叶植物的分类和环境意义

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2024-11-10 DOI: 10.1016/j.revpalbo.2024.105235

Ranita Biswas , Manjuree Karmakar , Madhab Naskar , Oindrila Biswas , K. Althaf Ahamed Kabeer , Subir Bera

Grass Silica Short Cell Phytoliths (GSSCPs) are regarded as a potential adjunctive tool for grass subfamily identification owing to their definite morphology and affinity towards certain grass subfamilies. In the present study phytolith spectra of the monotypic genus Danthonidium gammiei (Bhide) Hubb. in Hook., collected from northern Western Ghats, Maharashtra is studied in detail for the first time. This grass profusely produces Bilobates along with other GSSCPs and Elongate types. A thorough study is undertaken to find out potential of the Danthonidium gammiei Bilobates in distinguishing this grass from other major Bilobate producing grass sub-families like Panicoideae and Aristidoideae. The possible relationship between Bilobates specific for Danthonidium gammiei and the intensity of rainfall in northern Western Ghats is also discussed here. Statistical analyses (PCA, CA, and CCA) also establish the potential of Bilobate phytoliths in identifying Danthonioideae subfamily and discriminating different rainfall zones of the region.

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引用次数: 0

Organic walled dinoflagellate cyst biostratigraphy of the Bartonian/Priabonian GSSP Alano di Piave section, NE Italy 意大利东北部巴顿纪/普里阿本纪 GSSP Alano di Piave 断面的有机壁甲藻囊生物地层学

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2024-11-05 DOI: 10.1016/j.revpalbo.2024.105233

Alina I. Iakovleva

The present paper augments the multidisciplinary stratigraphic analysis of the Global Stratotype Section and Point (GSSP) Bartonian-Priabonian boundary Alano di Piave section (NE Italy). Twenty-seven stratigraphically signficant organic walled dinoflagellate cyst events, calibrated against the magnetostratigraphic polarity timescale, and earlier established zonations based on calcareous microfossils are recognized. Among these events the first occurrence (FO) of Oligokolpoma agniniae sp. nov. (∼ 8 m below the GSSP boundary), and the FO of Reticulatosphaera actinocoronata (∼ 8 m above the GSSP boundary) may be considered as additional stratigraphic indicators for the Bartonian-Priabonian boundary. Six new potentially stratigraphically significant species Heteraulacacysta alanoensis sp. nov., Heteraulacacysta reticulata sp. nov., Impagidinium bellunoensis sp. nov., Impagidinium veneziaense sp. nov., Lophocysta domenicorioi sp. nov., and Oligokolpoma agniniae sp. nov. are formally described.

引用次数: 0

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