Global conservation genomics of blue whales calls into question subspecies taxonomy and refines knowledge of population structure

IF 2.8 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Animal Conservation Pub Date : 2024-03-15 DOI:10.1111/acv.12935
C. R. M. Attard, J. Sandoval-Castillo, A. R. Lang, B. G. Vernazzani, L. G. Torres, R. Baldwin, K. C. S. Jenner, P. C. Gill, C. L. K. Burton, A. Barceló, M. Sironi, M.-N. M. Jenner, M. G. Morrice, L. B. Beheregaray, L. M. Möller
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Abstract

Blue whales (Balaenoptera musculus) are the largest living animal and, like other baleen whales, became endangered due to whaling. Here, we used population genomics to infer the number, distribution and other characteristics of subspecies and populations. We used the largest DNA dataset in blue whales, both in terms of genomic markers (16,661 SNPs and mtDNA) and geographic coverage (n = 276 for SNPs; n = 531 for mtDNA). We found greatest divergence among the eastern Pacific, Indo-western Pacific and Antarctic blue whales. There were indications that natural selection in different environments promoted divergence among these groupings. Within these regions, there was divergence between the eastern North and eastern South Pacific, and among the eastern Indian Ocean, the western South Pacific and the northern Indian Ocean. There was no divergence within the Antarctic. These findings are consistent with the current classification of Antarctic and Indo-western Pacific blue whales in the Southern Hemisphere as different subspecies but call into question the subspecies taxonomy of eastern Pacific blue whales. The study shows that opposite breeding seasons on either side of the equator do not necessarily inhibit connectivity across the equator, and reinforces that population structure needs to be well understood to conserve the diversity within species.

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蓝鲸全球保护基因组学对亚种分类提出质疑,并完善了对种群结构的认识
蓝鲸(Balaenoptera musculus)是现存最大的动物,与其他须鲸一样,因捕鲸而濒临灭绝。在这里,我们利用种群基因组学来推断亚种和种群的数量、分布和其他特征。我们使用了蓝鲸最大的 DNA 数据集,包括基因组标记(16,661 个 SNPs 和 mtDNA)和地理覆盖范围(SNPs n = 276;mtDNA n = 531)。我们发现东太平洋、印度-西太平洋和南极蓝鲸之间的差异最大。有迹象表明,不同环境中的自然选择促进了这些群体之间的分化。在这些区域内,北太平洋东部和南太平洋东部之间存在分化,印度洋东部、南太平洋西部和印度洋北部之间也存在分化。南极内部没有分化。这些发现与目前将南半球的南极蓝鲸和印度洋-西太平洋蓝鲸划分为不同亚种的观点一致,但对东太平洋蓝鲸的亚种分类提出了质疑。该研究表明,赤道两侧相反的繁殖季节并不一定会阻碍跨越赤道的连接,同时也进一步说明,要保护物种内部的多样性,就必须充分了解种群结构。
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来源期刊
Animal Conservation
Animal Conservation 环境科学-生态学
CiteScore
7.50
自引率
5.90%
发文量
71
审稿时长
12-24 weeks
期刊介绍: Animal Conservation provides a forum for rapid publication of novel, peer-reviewed research into the conservation of animal species and their habitats. The focus is on rigorous quantitative studies of an empirical or theoretical nature, which may relate to populations, species or communities and their conservation. We encourage the submission of single-species papers that have clear broader implications for conservation of other species or systems. A central theme is to publish important new ideas of broad interest and with findings that advance the scientific basis of conservation. Subjects covered include population biology, epidemiology, evolutionary ecology, population genetics, biodiversity, biogeography, palaeobiology and conservation economics.
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