Effects of Food and Cover on Numbers of Apache and Brown Trout Establishing Residency in Artificial Stream Channels
Effects of Food and Cover on Numbers of Apache and Brown Trout Establishing Residency in Artificial Stream Channels
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食物和覆盖物对在人工河道中定居的阿帕奇和褐鳟鱼数量的影响
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
C. Mesick
中科院分区：
文献类型：
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作者：
C. Mesick
摘要 在允许迁徙的室内人工河道中测试了食物和覆盖物在控制阿帕奇鳟鱼 Oncorhynchus apache（以前称为 Salmo apache）和褐鳟鱼 Salmo trutta 丰度方面的重要性。在不同水平的食物和覆盖物下，标准长度（SL）为7.0-21.5厘米的阿帕奇鳟鱼和标准长度为6.3-21.1厘米的褐鳟鱼被放置在单独但相同的通道中，它们可以从中随意迁徙。 4-7天后，当迁徙停止24小时后，对渠道中剩余的鱼进行计数。测试的所有尺寸的阿帕奇鳟鱼和长度至少为 17 厘米的褐鳟鱼都需要顶部覆盖物，以混凝土块的形式提供黑暗区域，以维持栖息地。混凝土块形式的物体覆盖仅提供视觉屏蔽，略微增加了河道中剩余的 6.3-21.1 厘米褐鳟鱼的数量，但并不影响阿帕奇鳟鱼的数量。对于小型动物来说，这两个物种因缺乏食物而迁徙的速度相对较慢。
Abstract The importance of food and cover in controlling the abundance of Apache trout Oncorhynchus apache (formerly Salmo apache) and brown trout Salmo trutta was tested in indoor artificial stream channels that permitted emigration. Under different levels of food and cover, Apache trout, 7.0–21.5 cm standard length (SL), and brown trout, 6.3–21.1 cm SL, were placed in separate but identical channels from which they could emigrate at will. After 4–7 d, when emigration had ceased for 24 h, the fish remaining in the channels were counted. Apache trout of all sizes tested and brown trout at least 17 cm in length required overhead cover, in the form of concrete blocks providing a dark area, to maintain residency. Object cover, in the form of concrete blocks providing only visual screening, slightly increased numbers of 6.3–21.1-cm brown trout remaining in the channels but did not affect the numbers of Apache trout. The emigration of both species in response to a lack of food was relatively slow for the small...