Competitive interactions for foraging microhabitats in a size-structured interspecific dominance hierarchy of two sympatric stream salmonids in a natural habitat
Competitive interactions for foraging microhabitats in a size-structured interspecific dominance hierarchy of two sympatric stream salmonids in a natural habitat
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自然栖息地中两条同域溪流鲑科鱼的尺寸结构的种间优势层次中觅食微生境的竞争性相互作用
DOI：
10.1139/z95-217
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发表时间：
1995
影响因子：
1.4
通讯作者：
S. Nakano
中科院分区：
文献类型：
--
作者：
S. Nakano
侵略性的相互作用，觅食行为，微生境，和个人的两个同域流居住的鲑鱼，白斑红点鲑（Salvelinus leucomaenis）和马苏鲑鱼（Oncorhynchus masou masou）的增长，在日本中部的一个山区流进行了研究。同一池内的鱼类形成了一个种间大小结构的优势等级。这两个物种的优势个体保持对下属同种和异种觅食领土，而下属charr采取非领土的战术。在每个物种中，最占优势的鱼通常举行的焦点最近的池入口，这确保了优先获得漂流食物，与下属分布在更远的下游。觅食微生境垂直不同的两个物种之间的水柱，利用附近的河床和鲑鱼占据中层的家域charr。鲑鱼的觅食尝试的频率是相当高的比charr。
Aggressive interactions, foraging behaviour, microhabitats, and growth of individuals of two sympatric stream-dwelling salmonids, white-spotted charr (Salvelinus leucomaenis) and masu salmon (Oncorhynchus masou masou), were studied in a mountain stream in central Japan. The fishes within a single pool in the stream formed an interspecific size-structured dominance hierarchy. Dominant individuals of both species maintained foraging territories against both subordinate conspecifics and heterospecifics, whereas subordinate charr adopted nonterritorial tactics. In each species, the most dominant fish usually held the focal point nearest to the pool inlet, which ensured priority of access to drifting food, with subordinates distributed farther downstream. Foraging microhabitats differed vertically in the water column between the two species, charr utilizing a home range near the stream bed and salmon occupying the midlayer. The frequency of foraging attempts by salmon was considerably higher than that by charr...