Genetic Effects of Hatchery Propagation and Rearing in the Endangered Rio Grande Silvery Minnow, Hybognathus amarus
Genetic Effects of Hatchery Propagation and Rearing in the Endangered Rio Grande Silvery Minnow, Hybognathus amarus
复制标题
濒临灭绝的格兰德河银鲦鱼孵化繁殖和饲养的遗传效应
DOI：
10.1080/10641260500341544
复制
发表时间：
2006
影响因子：
--
通讯作者：
T. F. Turner
中科院分区：
文献类型：
--
作者：
M. Osborne;M. A. Benavides;Dominique Alò;T. F. Turner
格兰德河银色小鱼，Hybognathus amarus，是一种联邦濒危鲤科动物，现在仅限于新墨西哥州的中格兰德河，在其以前的范围的一小部分。2000年夏天，剩余的野生种群急剧下降，缺乏补充，促使收集并将卵和野生鱼放置在繁殖设施中。本研究的目的是评估孵化繁殖的遗传效应，在格兰德河银鲫使用10个微卫星位点和部分线粒体ND 4序列。考虑了三个孵化场种群（2001年，2002年和2003年）和野生来源种群（2001-2002年收集）。主要调查结果是;（i）人工产卵和饲养的格兰德河银米诺鱼耗尽水平的等位基因多样性，但类似水平的杂合性野生种群，和（ii）从野生捕捞的鸡蛋提高鱼类保持类似水平的等位基因多样性，但有较高的近亲繁殖系数比野生源股票。随着超过50万条格兰德河银鲫被遣返到格兰德河，繁殖的遗传效应可能会影响剩余的野生种群，特别是在野生种群数量继续下降的情况下。
The Rio Grande silvery minnow, Hybognathus amarus, is a federally endangered cyprinid now confined to the middle Rio Grande, New Mexico, in a fraction of its former range. The precipitous decline of the remaining wild population and lack of recruitment in the summer of 2000 prompted collection and placement of eggs and wild fish in propagation facilities. The aim of this study was to assess the genetic effects of hatchery propagation in the Rio Grande silvery minnow using 10 microsatellite loci and partial mitochondrial ND4 sequences. Three hatchery stocks (2001, 2002, and 2003) and the wild source population (collected in 2001–2002) were considered. Principal findings were; (i) captively spawned and reared Rio Grande silvery minnow had depleted levels of allelic diversity but similar levels of heterozygosity to the wild population, and (ii) fish raised from wild-caught eggs maintained similar levels of allelic diversity but had higher inbreeding coefficients than the wild source stock. With the repatriation of over 500,000 Rio Grande silvery minnow to the Rio Grande, the genetic effects of propagation are likely to impact the remaining wild population, especially as numbers in the wild continue to decline.