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- W2333804979 abstract "SUMMARY (1) The population dynamics of Bdellocephala punctata (Pallas) were studied in the field, by qualitative (hand sampling) and quantitative (fixed quadrat) techniques, and in laboratory culture. (2) Bdellocephala punctata is an annual triclad. Adults, averaging 25 mm length, deposit cocoons on stones in January when temperatures rise above 0.5 ?C; these hatch by May but young do not appear on stones until July. They then grow to maturity at 18 mm by November. In the field, B. punctata deposits an average of 1.3 cocoons per adult, equivalent to sixteen young, and this is less than its potential. (3) Interspecific competition for food, particularly from Polycelis tenuis Ijima, may force hatchling B. punctata (3-4 mm long) to forage in suboptimal habitats where they experience severe mortality. Young B. punctata (8 mm long) escape this competition shadow and are able to forage on stones, which act as a prey focus. (4) It is argued that the origins of the semelparous strategy adopted by B. punctata and some other triclads lie in a selective requirement to reduce intensity of interspecific competition for hatchlings. By investing resources in reckless cocoon production early in the year these species avoid excessively severe competition from Polycelis and Dugesia, which are superior competitors breeding in spring and summer. (5) Bdellocephala punctata uses similar prey to its confamilial, Dendrocoelum lacteum (Muller), but avoids competition by size differential, breeding first and remaining 1.5 times longer during the autumn growth period. A population crisis at the study site was probably due to low water temperatures in February because these delayed breeding by B. punctata and hence increased competitive overlap with D. lacteum." @default.
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- W2333804979 date "1980-06-01" @default.
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- W2333804979 title "The Role of Competition in the Population Dynamics of a Freshwater Flatworm, Bdellocephala punctata (Turbellaria, Tricladida)" @default.
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- W2333804979 doi "https://doi.org/10.2307/4264" @default.
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