GEOGRAPHIC-VARIATION AMONG 3 ISOLATED POPULATIONS OF THE HADAL AMPHIPOD HIRONDELLEA GIGAS (CRUSTACEA, AMPHIPODA, LYSIANASSOIDEA)
GEOGRAPHIC-VARIATION AMONG 3 ISOLATED POPULATIONS OF THE HADAL AMPHIPOD HIRONDELLEA GIGAS (CRUSTACEA, AMPHIPODA, LYSIANASSOIDEA)
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DOI：
10.3354/meps092277
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发表时间：
1993-02-01
影响因子：
2.5
通讯作者：
FRANCE, SC
中科院分区：
文献类型：
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作者：
FRANCE, SC
深海的相对同质性和连续性可能提供一个生境，使物种能够维持广泛分布、遗传同质的种群。本研究探讨lysianassoid片足类Hirondellea gigas（比尔斯坦& Vinogradov 1955年），以确定是否从空间分离的栖息地在深海种群保持遗传同质性。H. gigas是一种食腐动物，在10 000米以上的深度对实验性诱饵迅速作出反应并消耗。它似乎是西太平洋海沟的特有种，仅在千岛-堪察加、日本、伊豆-小笠原、火山、雅普、马里亚纳、帕劳和菲律宾海沟内采集到。为了估计从最后3个战壕的人口隔离的程度，形态变异进行了量化，通过判别分析的表面形态特征。判别分类结果进行了比较，以“空人口”，使用自举随机化程序，以确定歧视的意义。变异足以使68.4%至84.5%的个体使用判别函数被正确地重新分类到其群体中。数据的自举随机化表明分类成功率显著高于随机。结果表明，这些地理隔离的战壕人口之间的基因流水平可能会降低，导致他们在形态上分歧。
The relative homogeneity and continuity of the deep sea may provide a habitat in which species can maintain widespread, genetically homogeneous populations. This study examines the lysianassoid amphipod Hirondellea gigas (Birstein & Vinogradov 1955) to determine whether populations from spatially-disjunct habitats in the deep sea maintain genetic homogeneity. H. gigas is a scavenger which rapidly responds to and consumes experimental baitfalls at depths of > 10 000 m. It appears to be endemic to western Pacific trenches, having been collected only within the Kurile-Kamchatka, Japan, Izu-Bonin, Volcano, Yap, Mariana, Palau, and Philippine Trenches. To estimate the degree of isolation of populations from the last 3 trenches, morphological variation was quantified through a discriminant analysis of surficial morphometric characters. Discriminant classification results were compared to 'null-populations', generated using a bootstrap randomization procedure, to determine the significance of the discrimination. Variation was sufficient to allow 68.4 to 84.5 % of individuals to be correctly reclassified into their population using discriminant functions. Bootstrapped randomizations of the data indicate that the classification success was significantly greater than random. Results indicate that these geographically-isolated trench populations may have reduced levels of gene flow between them, causing them to diverge morphologically.