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- W2509666041 abstract "The changes in distribution of Daphnia longispina, D. magna and D. pulex on a group of islands containing 507 rock-pools were followed over a three-year period with at least two samples per year. Of the pools 48 % were inhabited at least during some period and two-species coexistence was observed in 12% of the pools. The distribution of invasions (155 cases) corresponded closely to the expected frequen cies calculated as the product of frequencies of occupied and unoccupied patches. Empty pools and those occupied by other species were invaded with equal probabil ity. Median distances to the closest source area were the same (5 — 9 m) in all species, but distances of up to 500 m were recorded. Of the populations existing at the start of the study 25 — 30% became extinct, whereas 80% of the populations established during the first study year and 33 % of those established during the second year disappeared. It is suggested that the distribution of daphnids is maintained by populations inhabiting favourable rock-pools. From these source areas hazardous marginal areas are continuously invaded, but with little success." @default.
- W2509666041 created "2016-09-16" @default.
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- W2509666041 date "1986-01-01" @default.
- W2509666041 modified "2023-10-17" @default.
- W2509666041 title "Distributional dynamics of Daphnia species in a rock-pool environment" @default.
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