Genetic structure of the stonefly, Yoraperla brevis, populations: the extent of gene flow among adjacent montane streams
Genetic structure of the stonefly, Yoraperla brevis, populations: the extent of gene flow among adjacent montane streams
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石蝇、Yoraperla brevis、种群的遗传结构：相邻山地溪流之间基因流动的程度
DOI：
10.1046/j.1365-2427.1999.00385.x
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发表时间：
1999
影响因子：
2.7
通讯作者：
F. Allendorf
中科院分区：
文献类型：
--
作者：
J. Hughes;P. Mather;A. Sheldon;F. Allendorf
1.溪流昆虫种群中的基因流预计将取决于溪流网络中站点之间的距离和连通性，以及传播能力（即幼虫漂移和成虫飞行）。
2. Yoraperla brevis（班克斯）是落基山脉北方小溪流中丰富而独特的石首鱼。本文作者分析了美国蒙大拿州西部流入比特鲁河的七条溪流中27个地点的遗传结构。醋酸纤维素电泳鉴定出5个变异位点，共16个等位基因。
3.基因型频率符合Hardy-Weinberg的预期。内流分化低，外流变化（Fst）是一个数量级更高。
4. UPGMA分组流内的网站，也分组相邻流。邻接法生成的树虽然没有那么清晰，但也是类似的。
5.这种有序的模式（即哈代-温伯格比例，流和地理结构内的同质性）与在澳大利亚亚热带流中观察到的无脊椎动物的模式形成强烈对比。Yoraperla brevis在可预测的环境中保持着大量的种群，具有很长的生命周期，有可能发生群体混合，在大型繁殖种群中同步出现，并占据由高海拔地区隔开的溪流;澳大利亚的情况在大多数方面相反。
6.需要对一系列物种进行进一步分析，以确定Y。与澳大利亚种相比，短翅蝗更普遍地出现在北美溪流昆虫中。
1. Gene flow in populations of stream insects is expected to depend on the distance between and the connectedness of sites in stream networks, and on dispersal ability (i.e. larval drift and adult flight).
2. Yoraperla brevis (Banks) is an abundant and characteristic stonefly of smaller streams in the northern Rocky Mountains. The present authors analysed genetic structure at 27 sites in sevenz streams flowing into the Bitterroot River in western Montana, USA. Cellulose acetate electrophoresis identified five variable loci with 16 alleles.
3. Genotype frequencies conformed to Hardy–Weinberg expectations. Within-stream differentiation was low and among-stream variation (Fst) was an order of magnitude higher.
4. UPGMA grouped sites within streams and also grouped adjacent streams. The tree produced by the Neighbour Joining Method was similar although not quite so clear cut.
5. This orderly pattern (i.e. Hardy–Weinberg proportions, homogeneity within streams and geographical structure) contrasts strongly with patterns observed in invertebrates from subtropical streams in Australia. Yoraperla brevis maintains large populations in predictable environments, has a long life-cycle with a likelihood of cohort mixing, emerges synchronously in large breeding populations and occupies streams separated by areas of high relief; the Australian situation is the opposite in most respects.
6. Further analysis of a range of species is required to determine whether the different genetic structure in Y. brevis compared to the Australian species occurs more generally in North American stream insects.