Evidence for selective angling of introduced trout and their hybrids in a stocked brown trout population
Evidence for selective angling of introduced trout and their hybrids in a stocked brown trout population
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在放养的褐鳟鱼群中选择性垂钓引进鳟鱼及其杂交种的证据
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
C. Largiadèr
中科院分区：
文献类型：
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作者：
M. Mezzera;C. Largiadèr
比较的遗传组成的褐鳟鱼萨尔莫trutta捕获的垂钓者和电捕鱼的基础上三个诊断微卫星位点提供了强有力的证据表明，垂钓是选择性的储备褐鳟鱼种群。在两个地点，垂钓者抓住了显着年轻的鳟鱼和比例更多的介绍孵化场鳟鱼和杂交比观察到的电捕鱼调查。选择性钓鱼，结合一个小的法律的捕获量，可能已经大大消除了引进鳟鱼和杂交种产卵前在研究地点，从而可能减少了外来基因渗入到当地的基因库。垂钓是影响鱼类种群遗传结构的重要因素，在放养鱼类种群渐渗杂交及其管理研究中应予以考虑。在这项研究中，放养的人口后果没有评估。因此，即使放养的遗传后果可能是最小的或在很大程度上是可逆的，通过钓鱼，本地和引进鳟鱼之间的资源竞争，直到他们达到法律的捕获量，预计将有负面影响的本地鳟鱼人口的生产力。
Comparisons of the genetic composition of brown trout Salmo trutta captured by anglers and by electrofishing based on three diagnostic microsatellite loci provided strong evidence that angling is selective in a stocked brown trout population. At two sites, anglers caught significantly younger trout and proportionally more introduced hatchery trout and hybrids than were observed in electrofishing surveys. Selective angling, in combination with a small legal catch size, may have considerably eliminated introduced trout and hybrids before spawning at the study sites, and thus may have reduced the introgression of alien genes into the local gene pool. Angling can be an important factor influencing the genetic structure of fish populations and should be taken into account in studies of introgressive hybridization in stocked fish populations and their management. In this study, demographic consequences of stocking were not assessed. Thus, even though the genetic consequences of stocking may be minimal or largely reversible through angling, resource competition between native and introduced trout, until they reach legal catch size, is expected to have a negative effect on the productivity of the indigenous trout population.