Genetic structure of the beaked whale genus Berardius in the North Pacific, with genetic evidence for a new species
Genetic structure of the beaked whale genus Berardius in the North Pacific, with genetic evidence for a new species
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DOI：
10.1111/mms.12345
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发表时间：
2017-01-01
影响因子：
2.3
通讯作者：
Wade, Paul R.
中科院分区：
文献类型：
--
作者：
Morin, Phillip A.;Baker, C. Scott;Wade, Paul R.
在贝拉迪斯鲸属中有两个公认的物种，即贝尔德须鲸和阿努克斯喙鲸。在日本，捕鲸者传统上辨认出两种形式的贝尔德喙鲸，一种是常见的板岩灰色，另一种是较小的、罕见的黑色。先前对日本各地三个黑色样本和灰色样本的mtDNA控制区序列的比较表明，这两种形式包含不同的种群和潜在的不同物种。我们已经扩大了采样范围，包括北太平洋178头白嘴鲸的控制区单倍型。我们从阿留申群岛和白令海另外鉴定了5个黑色标本，总共8个黑色标本。Baird‘s喙鲸黑色和灰色体型的mtDNA单倍型之间的差异大于它们与南大洋中发现的同种Arnoux喙鲸之间的差异，与在其他同类喙鲸物种中观察到的类似。总而言之，来自日本和北太平洋标本的遗传证据，再加上较小的成年身体尺寸的证据，表明北太平洋存在一种未命名的贝拉迪斯物种。
There are two recognized species in the genus Berardius, Baird's and Arnoux's beaked whales. In Japan, whalers have traditionally recognized two forms of Baird's beaked whales, the common slate-gray form and a smaller, rare black form. Previous comparison of mtDNA control region sequences from three black specimens to gray specimens around Japan indicated that the two forms comprise different stocks and potentially different species. We have expanded sampling to include control region haplotypes of 178 Baird's beaked whales from across their range in the North Pacific. We identified five additional specimens of the black form from the Aleutian Islands and Bering Sea, for a total of eight black specimens. The divergence between mtDNA haplotypes of the black and gray forms of Baird's beaked whale was greater than their divergence from the congeneric Arnoux's beaked whale found in the Southern Ocean, and similar to that observed among other congeneric beaked whale species. Taken together, genetic evidence from specimens in Japan and across the North Pacific, combined with evidence of smaller adult body size, indicate presence of an unnamed species of Berardius in the North Pacific.