Is there really a drift paradox?
Article first published online: 5 MAR 2002
Journal of Animal Ecology
Volume 71, Issue 1, pages 151–154, January 2002
How to Cite
Humphries, S. and Ruxton, G. D. (2002), Is there really a drift paradox?. Journal of Animal Ecology, 71: 151–154. doi: 10.1046/j.0021-8790.2001.00579.x
- Issue published online: 5 MAR 2002
- Article first published online: 5 MAR 2002
- Received 8 May 2001; revision received 24 September 2001
- colonization cycle;
- invertebrate drift;
- population persistence
- 1Recent explanations for the persistence of freshwater invertebrates in the face of downstream drift (the so-called ‘drift paradox’) have centred largely on recolonization by upstream flight by preovipositing adults.
- 2Such explanations do not cover the many important species often found in the drift that lack an aerial phase. Here we demonstrate conclusively that long-range aerial movements are not required to explain the drift paradox.
- 3We show that small-scale movements along the streambed of the order of centimetres, combined with density dependence at some stage of the lifecycle, are sufficient to maintain populations over geological timescales.
- 4Further, we demonstrate that the principal previous modelling study of the drift paradox was parameterized in a way that is more compatible with such small-scale movements than the long-range flight for which it was intended.