The importance of habitat heterogeneity, biotic interactions and dispersal in abundance–occupancy relationships
Article first published online: 18 AUG 2004
Journal of Animal Ecology
Volume 73, Issue 5, pages 841–851, September 2004
How to Cite
HOLT, A. R., WARREN, P. H. and GASTON, K. J. (2004), The importance of habitat heterogeneity, biotic interactions and dispersal in abundance–occupancy relationships. Journal of Animal Ecology, 73: 841–851. doi: 10.1111/j.0021-8790.2004.00862.x
- Issue published online: 18 AUG 2004
- Article first published online: 18 AUG 2004
- Received 29 July 2003; accepted 15 December 2003
- interspecific abundance–occupancy relationship;
- biotic interactions;
- habitat heterogeneity;
- 1In simple microcosm systems, the form of interspecific abundance–occupancy relationships has been found to be dependent on biotic interactions. However, in more complex systems such effects may be obscured by those of habitat heterogeneity. Here we test this proposal using laboratory microcosms of protists and bacteria.
- 2The independent effects of species interactions and heterogeneity were tested by comparison of the abundance–occupancy relationship formed in multiple habitat patch systems containing all species together, with that relationship formed by combining data from equivalent systems containing each protist species alone and between homogeneous and heterogeneous environments.
- 3There was more residual variation about positive interspecific abundance–occupancy relationships formed in heterogeneous environments in interacting and non-interacting communities as the majority of species were more restricted in the number of patches they could occupy compared to homogeneous landscapes.
- 4Abundance–occupancy relationships in interacting communities were better defined than those in non-interacting communities. The inclusion of interspecific interactions caused a reduction in the abundance and occupancy of the majority of species and changed the position of species within the relationship.
- 5Our results show that biotic interactions influence the abundance–occupancy relationships even with imposed environmental heterogeneity. However, in heterogeneous environments, for some species these processes occurred in fewer patches, causing increased residual variation about positive interspecific abundance–occupancy relationships compared to homogeneous environments.