Size structure of benthic freshwater fish communities in relation to environmental gradients

被引:57
作者
Holmgren, K [1 ]
Appelberg, M [1 ]
机构
[1] Natl Board Fisheries, Inst Freshwater Res, SE-17893 Drottningholm, Sweden
关键词
direct gradient analysis; size-classes; species; trophic groups;
D O I
10.1006/jfbi.2000.1395
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
The benthic fish communities of 161 Swedish lakes, sampled with multi-mesh gillnets, were examined by direct gradient analyses with ten environmental factors. A geographic gradient, correlated with climatic factors and productivity, was most important for ordination of species optima. By contrast, the distribution of biomass in different size-classes and trophic groups, was influenced more directly by local factors such as water quality (PH) and lake morphometry (area and maximum depth). The communities are not only structured at the species level, but also by size-related allocation of resources, within and between coexisting species. This national survey confirmed patterns observed in previous local field studies, as well as experiments designed for testing mechanisms acting on size-structured populations. However, it highlighted the need for more extensive studies on if and how large-scale environmental variation affects the cues for size-related ontogenetic niche shifts in facultative piscivores, because species such as perch Perca fluviatilis, brown trout Salmo trutta, and Arctic charr Salvelinlus alpinus often dominate the benthic fish community. (C) 2000 The Fisheries Society of the British Isles.
引用
收藏
页码:1312 / 1330
页数:19
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