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- W2324442020 abstract "Rain poois on rock surfaces in tropical Africa harbour one of two principal chironomid species. Either Chironomus imicola or the cryptobiotic species Polypedilum vanderplanki occur; rarely are both species to be found together, nor does one species replace the other in time. Introductions of P. vanderplanki to pools normally inhabited by C. imicola largely fail. Chance can therefore be ruled out as a causal factor in determining species present. On the contrary, it has been possible to identify a series of factors responsible for controlling partitioning of available pools. P. vanderplanki proves to be excluded by scarcity of sediment, the presence of tadpoles or, under certain circumstances, by the presence of C. imicola. P. vanderplanki persists only where there is sufficient sediment, where there are no tadpoles and where the pool is shallow enough for flushing by rain to remove 'metabolites' produced by C. imicola. Only in short-lived pools, therefore, with neither tadpoles nor sediment, do the two species compete. Experiments in the laboratory suggest that here body size determines the outcome of competition. Since larvae of P. vanderplanki are able to survive dry periods, each reflooding finds individuals of this species well grown while C. imicola must re-invade and start afresh at the first instar after each dry period. P. vanderplanki is thus usually able to establish itself in pools of very short duration though it may require several years to do so. Close proximity of other pools may override the normal constraints. The situation surrounding partitioning of the habitat is, therefore, not a simple one." @default.
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- W2324442020 title "What Determines the Species Present in a Rain-Pool?" @default.
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- W2324442020 doi "https://doi.org/10.2307/3565215" @default.
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