Predator‐prey ratios in communities of freshwater invertebrates: the role of enemy free space
作者：
DOI: 10.1111/J.1365-2427.1985.TB00700.X
关键词: Predator 、 Detritivore 、 Trophic species 、 Biology 、 Range (biology) 、 Ecology 、 Competition (biology) 、 Invertebrate 、 Habitat 、 Predation
摘要: SUMMARY. 1 The ratio: number of predator species/number prey species is reviewed using comprehensive faunal lists for a range freshwater habitats in Britain and North America. Prey are defined as detritivores, herbivores fungivores; predators eat metazoan animals the main component their diet. Our data refer only to invertebrates. 2 The numbers apparently very closely correlated communities (r=0.84, In transformed data), with an average ratio 0.36. The changes from 0.48 small (species-poor) collections 0.29 large (species-rich) collections. 3 We suggest that approximately constant may be generated by: (a) being function broad classes or kinds prey; (b) constrained by competition between ‘enemy free space’, i.e. too similar unable coexist shared predators.
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