Intraguild predation reduces redundancy of predator species in multiple predator assemblage
Article first published online: 7 JUN 2006
© 2006 The Authors. Journal compilation © 2006 British Ecological Society
Journal of Animal Ecology
Volume 75, Issue 4, pages 959–966, July 2006
How to Cite
GRIFFEN, B. D. and BYERS, J. E. (2006), Intraguild predation reduces redundancy of predator species in multiple predator assemblage. Journal of Animal Ecology, 75: 959–966. doi: 10.1111/j.1365-2656.2006.01115.x
- Issue published online: 23 JUN 2006
- Article first published online: 7 JUN 2006
- Received 4 October 2005; accepted 22 March 2006
- functional equivalency;
- multiple predator effects;
- predator interference;
- risk reduction;
- substitutable effects
- 1Interference between predator species frequently decreases predation rates, lowering the risk of predation for shared prey. However, such interference can also occur between conspecific predators.
- 2Therefore, to understand the importance of predator biodiversity and the degree that predator species can be considered functionally interchangeable, we determined the degree of additivity and redundancy of predators in multiple- and single-species combinations.
- 3We show that interference between two invasive species of predatory crabs, Carcinus maenas and Hemigrapsus sanguineus, reduced the risk of predation for shared amphipod prey, and had redundant per capita effects in most multiple- and single-species predator combinations.
- 4However, when predator combinations with the potential for intraguild predation were examined, predator interference increased and predator redundancy decreased.
- 5Our study indicates that trophic structure is important in determining how the effects of predator species combine and demonstrates the utility of determining the redundancy, as well as the additivity, of multiple predator species.