Predatory functional response and prey choice identify predation differences between native/invasive and parasitised/unparasitised crayfish.

PloS One
Neal R HaddawayA M Dunn

Abstract

Invasive predators may change the structure of invaded communities through predation and competition with native species. In Europe, the invasive signal crayfish Pacifastacus leniusculus is excluding the native white clawed crayfish Austropotamobius pallipes. This study compared the predatory functional responses and prey choice of native and invasive crayfish and measured impacts of parasitism on the predatory strength of the native species. Invasive crayfish showed a higher (>10%) prey (Gammarus pulex) intake rate than (size matched) natives, reflecting a shorter (16%) prey handling time. The native crayfish also showed greater selection for crustacean prey over molluscs and bloodworm, whereas the invasive species was a more generalist predator. A. pallipes parasitised by the microsporidian parasite Thelohania contejeani showed a 30% reduction in prey intake. We suggest that this results from parasite-induced muscle damage, and this is supported by a reduced (38%) attack rate and increased (30%) prey handling time. Our results indicate that the per capita (i.e., functional response) difference between the species may contribute to success of the invader and extinction of the native species, as well as decreased biodiversity a...Continue Reading

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Citations

Feb 26, 2014·Oecologia·Benjamin J ToscanoBlaine D Griffen
Oct 15, 2013·The Journal of Animal Ecology·Daniel Barrios-O'NeillHelene C Bovy
Jun 9, 2015·The Journal of Animal Ecology·Eoin J O'Gorman
Jan 30, 2015·Ecology Letters·Wolf-Christian Saul, Jonathan M Jeschke
Apr 17, 2016·The Journal of Animal Ecology·Michelle C JacksonIan Donohue
May 9, 2019·Proceedings. Biological Sciences·Laura Melissa Guzman, Diane S Srivastava
Jan 1, 2017·Biological Invasions·N G Taylor, A M Dunn
Dec 1, 2020·Ecology and Evolution·Marcus A LashleyChristopher J Lortie
Jul 25, 2017·Trends in Ecology & Evolution·Julia C Buck, William J Ripple
Mar 16, 2021·Ecology and Evolution·Vanessa Haller-Bull, Michael Bode
Apr 21, 2021·Journal of Invertebrate Pathology·Lucy G AndersonAlison M Dunn

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