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• W2321833743 abstract "The growth rate and survival of Hydrobia rentrosa and H. ulvae from naturally co-existing populations were investigated when kept together and separately in cages settled in an intertidal pool. Population density ranged from 2800 to 22000 ind./m 2 . Density dependent mortality was not found. No influence of related species on mortality was observed. However, growth variation of snails suggested strong interspecific competition. Despite large differences in size of H. ulnae and young H. ventrosa used in the experiments (initial size ratio 1.8 ; final 1.4), the effect of interspecific competition was significant. Moreover, interspecific competition was asymmetrical. At population densities of 7000 14000 ind./m 2 with H. ulvae present, H. ventrosa grew slower than in single-species populations. In contrast, H. ulvae under the same conditions increased growth rate in comparison to single-species populations. The competition coefficient (α), as a function of population density based on growth rate individuals, was calculated. The proportion of inter- to intraspecific competition in their joint influence on Hydrobia growth rate depends on population density. This correlation was non-linear. With population density close to naturals H. ulvae growth is limited by intraspecific competition. H. ventrosa growth is limited by interspecific competition. It may be supposed that stable coexistence of these two species is possible only in populations dominated by H. ventrosa. Moreover, the larger the proportion of H. ventrosa, the higher should be the growth rate. In contrast, the correlation between growth rate of H. ulvae and proportion of this species should be negative. The population density and presence of congeners have a great impact on shell size as can be shown after only three months of cage experiments. The growth rate of the mud snails varies within the wide range of the norm response on food availability. This contradicts the opinion of the hereditary nature of character displacement of H. ulvae and H. ventrosa when they co-exist and allows the adoption of an environment-based explanation of the phenomenon." @default.
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• W2321833743 date "1996-10-01" @default.
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• W2321833743 title "The Enigma of Mud Snail Shell Growth: Asymmetrical Competition or Character Displacement?" @default.
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• W2321833743 doi "https://doi.org/10.2307/3545588" @default.
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