Resource partitioning among rock-dwelling haplochromines (Pisces: Cichlidae) from Lake Victoria
Resource partitioning among rock-dwelling haplochromines (Pisces: Cichlidae) from Lake Victoria
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DOI：
10.1111/j.1600-0633.1997.tb00165.x
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发表时间：
1997-12-01
影响因子：
1.8
通讯作者：
van Alphen, JJM
中科院分区：
文献类型：
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作者：
Bouton, N;Seehausen, O;van Alphen, JJM
对维多利亚湖南部岩石岛屿上的4个单染慈鲷组合进行了资源分配研究。重点放在饮食隔离，而微生境隔离的数据主要用于确定食物的潜在竞争者。饮食和微生境隔离证明在所有四个组合。在其中一个组合中，我们观察到两个丝状藻类饲养者之间的资源分配很少。食物的竞争的作用进行了讨论的基础上的波动饮食重叠在食物供应的季节性变化。饮食重叠被证明是最高的食物丰富的时期。这与食物丰富时竞争减少的假设是一致的。此外，我们比较了鱼类密度之间的组合，因为竞争会调节密度。我们发现，饮食是最多样化的组合与最低的鱼类密度，而在饮食的种间差异最小。食物似乎并没有限制这个特定的组合，除了食物竞争之外，其他因素在调节密度方面可能更重要。
Resource partitioning was studied on four assemblages of haplochromine cichlids at rocky islands in the southern part of Lake Victoria. The emphasis was put on diet segregation, while data on microhabitat segregation were mainly used to determine potential competitors for food. Diet and microhabitat segregation were demonstrated in all four assemblages. In one of the assemblages we observed little partitioning of resources among two filamentous algae feeders. The role of competition for food is discussed on the basis of fluctuations in diet overlap in relation to seasonal changes in food supply. Diet overlap proved to be highest in periods of food abundance. This is in concordance with the hypothesis that competition decreases in case of food abundance. Furthermore, we compared fish densities between assemblages, because competition would regulate density. We found that diets were most diverse in the assemblage with lowest fish density, while interspecific differences in diet were smallest. Food seems not to be limiting in this particular assemblage, and factors other than competition for food are probably more important in regulating density here.