Proportions of Native and Introduced Brown Trout in Adjacent Fished and Unfished Spanish Rivers
Proportions of Native and Introduced Brown Trout in Adjacent Fished and Unfished Spanish Rivers
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邻近已捕捞和未捕捞的西班牙河流中本地和引进褐鳟鱼的比例
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
C. Pla
中科院分区：
文献类型：
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作者：
J. García;N. Sanz;C. Pla
外源孵化鱼与当地种群存在不同程度的遗传相互作用的证据来自西班牙东北部四个高度捕捞地区和八个邻近的受保护和未捕捞地区的褐鲑鱼采集。尽管根据孵化场和本地鱼在Ldh-C *基因座上的固定差异以及在其他三个基因座(Smdh-A2*、Idhp-2*、Idhp-3*)上发现的不明显差异，每个样品中都检测到一定程度的杂交或导入，但鱼类种群的孵化基因水平显著低于受保护种群。在被捕捞和放养的地区，本地鱼类的持久性较强，这似乎反映了孵化场饲养的鱼类更容易钓鱼。尽管目前还不确定这种差异是与生俱来的，还是孵化场饲养的反映，但放养在被剥削的河流中并不能有效地增加接受者的数量。这些数据表明，可能需要采取不同的战略来保护捕捞和保护区内的土著人口，而在后一种情况下，可能需要采取更严厉的措施。
Evidence of different degrees of genetic interactions of exogenous hatchery fish with native populations was electrophoretically obtained from collections of brown trout from four heavily fished areas and eight adjacent protected and unfished areas in northeastern Spain. Although some degree of hybridization or introgression was detected in each collection based on fixed differences between hatchery and native fish at the LDH‐C * locus and less distinct differences were found at three other loci (sMDH‐A2*, IDHP‐2*, IDHP‐3*), fished populations had significantly lower levels of hatchery genes than protected ones. The greater persistence of native fish in areas that were fished and stocked appeared to reflect a greater susceptibility of hatchery‐reared fish to angling. Although it remains uncertain whether this difference is innate or a reflection of hatchery rearing, stocking was ineffective in enhancing the recipient population in the exploited river. These data suggest that different strategies may be needed for protection of native populations in fished and protected areas and that more intense measures may be required in the latter instance.