Biological report of a giant deep-sea squid Onykia robusta collected from the Sanriku coast, Japan: Implications for low genetic diversity.
Biological report of a giant deep-sea squid Onykia robusta collected from the Sanriku coast, Japan: Implications for low genetic diversity.
复制标题
从日本三陆海岸采集的巨型深海鱿鱼 OnykiaRobista 的生物学报告：低遗传多样性的影响。
DOI：
10.1007/s12526-017-0770-8
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发表时间：
2018
影响因子：
1.6
通讯作者：
Yoshihisa Kurita
中科院分区：
文献类型：
--
作者：
Kazuki Kanno;Akihiko Koyama;Yoshihisa Kurita;Yoshihisa Kurita
尽管它们对研究人员和普通公众都很有吸引力，但巨型深海鱿鱼的生物学仍然是个谜。粗壮的棍钩乌贼Onykia robusta(Verrill，1876)是现存最大的深海鱿鱼之一。它分布在日本和加利福尼亚州之间的北太平洋，包括白令海。尽管这个物种经常被渔民捕获，但它的生物学在很大程度上仍然不为人所知。在这篇文章中，我报告了从日本东北部三陆海岸收集的一个标本的生物学数据。个体为性成熟雌性(全长：246厘米，外套长：125厘米，湿重：26公斤)，卵母细胞可能已经足够大，足以开始卵黄积累。对线粒体DNA(MtDNA)细胞色素氧化酶I(COI)基因的比较分析表明，该物种的遗传多样性较低(n=5；另外4个序列来自GenBank)。这种低核苷酸多样性(π=0.0044)与深海巨型乌贼相似，从线粒体DNA分析得知，这种乌贼缺乏可辨别的种群结构，表明来自太平洋不同地区的样本之间没有遗传分化。这种乌贼被认为是高度迁徙的，可能经历了一个中上层的半深海阶段。我的数据表明，深海巨型鱿鱼中存在一种共同的扩散策略。
Despite their appeal to both researchers and the general public, the biology of giant deep-sea squids remains enigmatic. The robust clubhook squidOnykia robusta(Verrill, 1876) is one of the largest living deep-sea squids. It is distributed across the northern Pacific Ocean between Japan and California, including the Bering Sea. Although this species has been frequently caught by fishermen, its biology remains largely unknown. In this paper, I report biological data from one specimen, which was collected from the Sanriku Coast of northeastern Japan. The individual was a sexually mature female (total length: 246 cm, mantle length: 125 cm, wet body weight: 26 kg) and with oocytes that may have been large enough to begin yolk accumulation. Low genetic diversity within this species was implied by comparative analysis of the mitochondrial DNA (mtDNA) cytochrome oxidase I (COI) gene (n= 5; additional four sequences sourced from GenBank). The low nucleotide diversity (π = 0.0044) was similar to that of the deep-sea giant squidArchiteuthis dux, which is known from mtDNA analysis to lack discernible population structure, showing no genetic differentiation among samples from different regions of the Pacific.Architeuthis duxhas been hypothesized to be highly migratory, probably through a pelagic paralarval stage. My data suggest the presence of a common dispersal strategy among the deep-sea giant squids.