Food habits of introduced brown trout and native masu salmon are influenced by seasonal and locational prey availability
Food habits of introduced brown trout and native masu salmon are influenced by seasonal and locational prey availability
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DOI：
10.1007/s12562-012-0554-9
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发表时间：
2012-11-01
影响因子：
1.9
通讯作者：
Ohkuma, Kazumasa
中科院分区：
文献类型：
--
作者：
Hasegawa, Koh;Yamazaki, Chitose;Ohkuma, Kazumasa
了解食物习性对于评估同域物种之间的种间竞争和捕食是重要的。在这类调查中，有关食物供应的数据应与有关饮食习惯的数据相结合。虽然不同栖息地或季节的食物供应不同，但这些差异在以前的研究中从未被考虑过。我们在一条溪流中进行了全年的实地调查，以比较引进的鲑鱼，棕色鳟鱼Salmo trutta和本地鲑鱼，masu鲑鱼Oncorhynchus masou的饮食习惯。马苏鲑鱼在褐鳟的饮食中所占的比例并不大，反之亦然。因此，捕食可能不会影响这两个物种的种群水平。褐鳟和马苏鲑鱼之间的饮食重叠取决于伽马鱼科和陆生无脊椎动物的存在；也就是说，种间争夺食物资源的强度可能因食物条件的不同而不同。
A knowledge of food habits is important for evaluating interspecific competition and predation between sympatric species. Data on food availability should be combined with data on food habits in this type of survey. Although food availability differs between habitats or seasons, these differences had never been considered in previous studies. We conducted year-round field surveys throughout a stream to compare the food habits of an introduced salmonid, brown trout Salmo trutta, and a native salmonid, masu salmon Oncorhynchus masou. Masu salmon did not constitute a large proportion of the diet of brown trout and vice versa. Thus, predation will likely not affect the population level of either species. The dietary overlap between brown trout and masu salmon varied depending on the presence of Gammaridae and terrestrial invertebrates; i.e., the intensity of interspecific competition for food resources may differ according to food conditions.