Extreme winter aggregation of invasive rainbow trout in small tributaries: implications for effective control
Extreme winter aggregation of invasive rainbow trout in small tributaries: implications for effective control
复制标题
DOI：
10.1007/s10228-016-0558-z
复制
发表时间：
2017-04
影响因子：
1.2
通讯作者：
I. Koizumi;Yukiyo Kanazawa;Chitose Yamazaki;Yuuki Tanaka;Kousuke Takaya
中科院分区：
文献类型：
--
作者：
I. Koizumi;Yukiyo Kanazawa;Chitose Yamazaki;Yuuki Tanaka;Kousuke Takaya
由于其很高的经济和娱乐价值，鲑鱼在世界范围内被广泛引入，并对当地生态系统造成重大影响。然而，控制或根除引入的鲑鱼种群的有效方法仍然有限，特别是在大型河流系统中。在这里，我们证明了入侵虹鱼Oncorhynchus mykisis在冬季迁移到并极度聚集在小支流中，这可以用于有效的种群控制。日本北海道中部的Tokachi River流域的10条小福河支流进行了季节性普查。在四条流速较低的支流中，冬季的鱼类丰度是夏季的8-125倍。相对较大的个体(200-350毫米)以异常高的密度聚集在几个池子里(2-3个个体/平方米或每个池子170-440个个体)。雌性在冬季的小支流中很常见，但在夏天则不常见。因此，在初冬时，在如此小的支流中移走入侵的虹鲑鱼可能是最好的做法。由于许多溪流鱼类在特定的、往往有限的栖息地越冬，在有效管理非本地鱼种时，应更多地注意这种冬季习性。
Because of their high economic and recreational value, salmonids have been extensively introduced worldwide and are responsible for significant impacts on native ecosystems. However, effective methods for controlling or eradicating introduced populations of salmonids are still limited, particularly in large river systems. Here, we demonstrated that invasive rainbow troutOncorhynchus mykissimmigrated to and extremely aggregated in small tributaries during the winter, which can be utilized for effective population control. Seasonal census was conducted in 10 small tributaries of the Otofuke River in the Tokachi River basin, central Hokkaido, Japan. Winter abundance was 8–125 times higher than summer abundance in four of the tributaries where water velocities were low. Relatively large individuals (200–350 mm) aggregated in several pools at an unusually high density (>2–3 individuals/m2or 170–440 individuals per pool). Females were common in the small tributaries in the winter, but not in the summer. Therefore, removal of invasive rainbow trout may be best practised in such small tributaries during early winter. Because many stream fishes overwinter in specific, often limited, habitats, more attention should be paid to such winter habits in the effective management of non-native fish species.