Genetic differentiation in populations of the freshwater amphipods Gammarus roeseli and Gammarus fossarum
Genetic differentiation in populations of the freshwater amphipods Gammarus roeseli and Gammarus fossarum
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淡水片脚类 Gammarus roeseli 和 Gammarus fossarum 种群的遗传分化
DOI：
10.1111/j.1601-5223.1988.tb00364.x
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发表时间：
2008
期刊：
影响因子：
2.7
通讯作者：
H. Siegismund
中科院分区：
文献类型：
--
作者：
H. Siegismund
用淀粉凝胶电泳法研究了两种淡水伽马鱼的种群结构。主要研究区域是巴伐利亚州南部的伊萨尔河及其支流。这两个物种种群的遗传分化反映了它们的地理分布格局。罗氏藻非常常见，并在河流中持续分布。该种的遗传变异表现出一定的规律性。在该物种中发现的两个多态基因座在河系的一部分具有相对恒定的频率，或在伊萨尔河显示平行的倾斜变异。相比之下，在研究区域内呈斑块状分布，因此在较少的地点采集的G.fossarum具有更分化的种群结构。在本种中没有观察到克隆变异；所有种群在四个多态位中至少一个上彼此不同。种群的分化用与地理分布相一致的遗传关系树来描述。
The population structures of the two freshwater Gammarus species G. roeseli GERVAIS and G. fossarum KOCH were studied by starch gel electrophoresis. The main study area was the river Isar with its tributaries in Southern Bavaria. The genetic divergence in populations of the two species reflects their geographical distribution pattern. G. roeseli is very common and is continuously distributed in the rivers. This species showed a regular pattern in its genetic variation. The two polymorphic loci found in this species had either a relatively constant frequency in a part of the river system or showed a parallel clinal variation in the Isar river. In contrast, G. fossarum, which has a patchy distribution in the study area and therefore was collected at fewer locations, had a more differentiated population structure. No clinal variation was observed in this species; all populations differed from each other in at least one of the four polymorphic loci. The divergence of the populations is described with a tree of genetic relatedness that corresponds well with the geographic distribution.