Morphological and electrophoretic studies of the genus Themisto (Amphipoda: Hyperiidea) from the South and North Atlantic
Morphological and electrophoretic studies of the genus Themisto (Amphipoda: Hyperiidea) from the South and North Atlantic
复制标题
南大西洋和北大西洋的 Themisto 属（片足纲：Hyperiidea）的形态学和电泳研究
DOI：
10.1007/bf00443398
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发表时间：
1986
期刊：
影响因子：
1.7
通讯作者：
R. Weigmann
中科院分区：
文献类型：
--
作者：
R. Schneppenheim;R. Weigmann
摘要Themisto属在大西洋水域由四个不同的种代表：北半球的Themisto、Themista、T.abyssorum和T.libelula以及南半球的T.gaudichaudii。对形态和电泳学特征的研究表明，以前被认为具有两极分布的高氏沼虾，实际上分别在北极和南极水域由不同的物种组成。南极物种仍然是1828年的T.guchichaudii Guérin，北极物种最古老的名称是T.compresa Goes 1865。研究结果还表明，高氏毛虫内部的形态变异(如“扁平”和“双翅”型)更有可能是环境影响的结果，而不是遗传差异的结果。遗传变异的电泳分析表明，来自南乔治亚岛和南设得兰群岛附近水域的高氏毛虫属于同一杂交种群。对其他南极远洋动物同质性的类似观察表明，南极绕极洋流系统促进了有效的遗传交换，减少了形成不同的地方繁殖种群的可能性。
SummaryThe genus Themisto is represented in Atlantic Ocean waters by four different species: T. compressa, T. abyssorum, and T. libellula in the northern hemisphere and T. gaudichaudii in the southern hemisphere. Examination of morphological and electrophoretic characters has revealed that T. gaudichaudii, which was previously thought to have a bipolar distribution, in fact consist of separate species in Arctic and Antarctic waters, respectively. The Antarctic species remains as T. gauchichaudii Guérin 1828 and the oldest available name for the Arctic species is T. compressa Goes 1865. The results of the study also indicate that morphological variation within T. gaudichaudii (e.g. the “compressa” and “bispinosa” forms) is more likely to be the result of environmental influences rather than genetic differences. Electrophoretic analyses of genetic variation indicate that T. gaudichaudii from waters adjacent to both South Georgia Island and the South Shetland Islands belong to the same interbreeding population. Similar observations of homogeneity in other Antarctic pelagic animals suggest that the Antarctic circumpolar current systems promote effective genetic exchange and reduce the possibility of formation of distinct local breeding populations.