Approaches to the analysis of energetic costs of intraspecific competition for space by rainbow trout (Salmo gairdneri)
Approaches to the analysis of energetic costs of intraspecific competition for space by rainbow trout (Salmo gairdneri)
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虹鳟鱼种内空间竞争能量成本的分析方法（Salmo gairdneri）
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
R. W. Brocksen
中科院分区：
文献类型：
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作者：
Hiram W. Li;R. W. Brocksen
对两种估算虹鳟鱼密度依赖性活动能量消耗的方法进行了试验。从实验室系统中的生长实验获得代谢率。在较高的人口密度的代谢率的增加归因于三个因素：（1）饥饿，（2）增加运动水平的亚优势鱼被迫保持站在快速的水，由于饱和的领土更占主导地位的鳟鱼，（3）更高的飞机的兴奋。结果表明，常规代谢、生长率、消耗率和生长效率等能量因子的方差随密度的增加而增加。这些反应似乎是种内竞争的一个很好的迹象。密度和平均每日口粮，或密度和攻击行为之间的相关性不大。
占主导地位的鳟鱼，作为一个群体增长更快，增长更有效，并含有更大的脂质含量比其他人口在每个密度。然而，严格定义的，充满活力的优势并没有赋予一个“啄权”的基础上。在较高的密度，优势带来的好处比在较低的人口水平。空间限制本身并不是影响增长率的一个影响因素。用于估计密度依赖的能源成本的方法进行了评估。这两种方法给出了几乎相同的估计。
Two approaches of estimating energy expended by rainbow trout (Salmo gairdneri) on density-dependent activities were tested. Metabolic rates were obtained from growth experiments in laboratory systems. Increases in metabolic rates at higher population densities were attributed to three factors: (1) starvation, (2) increased levels of exercise by subdominant fish were forced to maintain stations in fast water due to saturation of territories of more dominant trout, (3) higher planes of excitation. It was observed that variance of energetic factors of routine metabolism, growth rate, consumption rate, and growth efficiency tended to increase with density. These responses seem to be a good indication of intraspecific competition. Little correlation was observed between density and average daily ration, or density and aggressive behaviour.
Dominant trout, as a group grew faster, grew more efficiently, and contained greater lipid content than the rest of the population at each density. However, strictly defined, energetic advantages were not conferred on a ‘peck-right’ basis. At higher densities, dominance conferred less benefits than was observed at lower population levels. Space limitation per se was not an influential factor affecting growth rates. Methods used to estimate density-dependent energy costs are evaluated. Both methods give nearly identical estimates.