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Priority Effects and Species Coexistence: Experiments with Fungal-Breeding Drosophila
Bryan Shorrocks and Marc Bingley
Journal of Animal Ecology
Vol. 63, No. 4 (Oct., 1994), pp. 799-806
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/5257
Page Count: 8
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1. Priority experiments were carried out using the fungal-breeding species Drosophila phalerata and D. subobscura and the mushroom Agaricus bispora forma albida. 2. Field experiments showed that an oviposition window exists for these species and that priority in increments of 1 day are suitable for laboratory experiments. 3. Priority (arriving first) had a clear effect upon three components of `fitness'. When a species arrived late it had lower survival, smaller size and longer developmental time. 4. A priority model [based upon the `aggregation model' of Atkinson & Shorrocks (1981)] showed that traditional priority (both species arrive on average together, but with a range of priorities) does not significantly contribute to coexistence. 5. When the average arrival time is moved so that more fugitive situations are modelled, then priority can have a marked effect upon coexistence. 6. Both `priority' and `fugitive' situations are dominated by realistic amounts of intraspecific aggregation. This has implications for metapopulation dynamics.
Journal of Animal Ecology © 1994 British Ecological Society