Population Genomic Analysis Reveals Contrasting Demographic Changes of Two Closely Related Dolphin Species in the Last Glacial

Molecular Biology and Evolution
Nagarjun VijayJoong-Ki Park

Abstract

Population genomic data can be used to infer historical effective population sizes (Ne), which help study the impact of past climate changes on biodiversity. Previous genome sequencing of one individual of the common bottlenose dolphin Tursiops truncatus revealed an unusual, sharp rise in Ne during the last glacial, raising questions about the reliability, generality, underlying cause, and biological implication of this finding. Here we first verify this result by additional sampling of T. truncatus. We then sequence and analyze the genomes of its close relative, the Indo-Pacific bottlenose dolphin T. aduncus. The two species exhibit contrasting demographic changes in the last glacial, likely through actual changes in population size and/or alterations in the level of gene flow among populations. Our findings suggest that even closely related species can have drastically different responses to climatic changes, making predicting the fate of individual species in the ongoing global warming a serious challenge.

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Citations

Jun 22, 2019·Scientific Data·Shengyong XuTianxiang Gao
Aug 3, 2019·Journal of Molecular Evolution·Sagar Sharad ShindeNagarjun Vijay
May 19, 2021·Heredity·Ajinkya Bharatraj Patil, Nagarjun Vijay

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Methods Mentioned

BETA
Illumina sequencing

Software Mentioned

samtools
BWA
bamCaller
ANGSD
SMC
shapeit
MEM
MSMC
Trimmomatic
seqtk

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