Paleocene-Eocene and Plio-Pleistocene sea-level changes as "species pumps" in Southeast Asia: Evidence from Althepus spiders

Molecular Phylogenetics and Evolution
Fengyuan Li, Shuqiang Li

Abstract

Sea-level change has been viewed as a primary driver in the formation of biodiversity. Early studies confirmed that Plio-Pleistocene sea-level changes led to the isolation and subsequent genetic differentiation of Southeast (SE) Asian organisms over short geological timescales. However, long-time consequences of sea-level fluctuations remain unclear. Herein, we analyze the evolutionary history of Althepus (spiders) whose distribution encompasses Indo-Burma and the Sunda shelf islands to understand how sea-level changes over shallow and deep timescales effected their history. Our integrative analyses, including phylogeny, divergence times, ancestral area reconstruction and diversification dynamics, reveal an intricate pattern of diversification, probably triggered by sea-level fluctuations during the Paleocene-Eocene and Plio-Pleistocene. The timing of one early divergence between the Indo-Burmese and Sundaic species coincides with late Paleocene and early Eocene high global sea levels, which induced the formation of inland seaways in the Thai-Malay Peninsula. Subsequent lowered sea levels could have provided a land bridge for its dispersal colonization across the Isthmus of Kra. Analyses suggest that Plio-Pleistocene sea-level ...Continue Reading

Citations

Nov 13, 2019·Biological Reviews of the Cambridge Philosophical Society·Ivan L F MagalhaesMartín J Ramírez
Apr 22, 2020·Scientific Reports·Ivan N BolotovAlexander V Kondakov
Oct 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Oskar HagenLoïc Pellissier
Jan 5, 2022·Proceedings. Biological Sciences·Xiao-Qian LiWei Wang

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