Comparative Shape of Two Recently Diverged Species of Pacific Rockfish: Sebastes ciliatus and S. variabilis

Diversity Pub Date : 2024-09-05 DOI:10.3390/d16090552
Jonah Smith, Michael Sorensen, Dennis K. Shiozawa, Mark C. Belk
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Abstract

Species delimitation can be based on the consideration of several different criteria, including the differentiation of ecological or functional traits. Two species of Pacific rockfish, the dark rockfish (Sebastes ciliatus) and the dusky rockfish (Sebastes variabilis), appear to represent recently divergent evolutionary lineages. We evaluate evidence for the differentiation of these two species in somatic shape using geometric morphometrics at two locations in the northeast Pacific where they occur in sympatry. The somatic shape was significantly different between species, but the species’ shape did not vary between the two locations. Sebastes ciliatus had an upturned and relatively smaller head, eye, and jaw, and an elongated midbody, whereas S. variabilis had a downturned and larger head, eye, and jaw, and a shorter midbody. These results suggest that S. ciliatus and S. variabilis are morphometrically differentiated in a similar way in both locations. The somatic shape differentiation between these two sympatric species is similar to genus-wide patterns of somatic shape differentiation.
两种新近分化的太平洋岩鱼的形状比较:Sebastes ciliatus 和 S. variabilis
鱼种的划分可以基于几种不同的标准,包括生态或功能特征的区分。太平洋岩鱼的两个物种--深色岩鱼(Sebastes ciliatus)和暗色岩鱼(Sebastes variabilis)--似乎代表了最近出现分化的进化品系。我们在这两个物种共生的东北太平洋两个地点,利用几何形态计量学评估了这两个物种体形分化的证据。不同物种之间的体形存在明显差异,但物种的体形在两个地点之间并无不同。Sebastes ciliatus的头、眼和颌上翘,相对较小,中体拉长;而S. variabilis的头、眼和颌下垂,较大,中体较短。这些结果表明,S. ciliatus 和 S. variabilis 在两地的形态分化方式相似。这两个同域物种之间的体形分化与全属的体形分化模式相似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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