Space race functional responses
2015 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 282, no 1801, 20142121Article in journal (Refereed) Published
We derive functional responses under the assumption that predators and prey are engaged in a space race in which prey avoid patches with many predators and predators avoid patches with few or no prey. The resulting functional response models have a simple structure and include functions describing how the emigration of prey and predators depend on interspecific densities. As such, they provide a link between dispersal behaviours and community dynamics. The derived functional response is general but is here modelled in accordance with empirically documented emigration responses. We find that the prey emigration response to predators has stabilizing effects similar to that of the DeAngelis-Beddington functional response, and that the predator emigration response to prey has destabilizing effects similar to that of the Holing type 11 response. A stability criterion describing the net effect of the two emigration responses on a Lotka-Volterra predator-prey system is presented. The winner of the space race (i.e. whether predators or prey are favoured) is determined by the relationship between the slopes of the species' emigration responses. It is predicted that predators win the space race in poor habitats, where predator and prey densities are low, and that prey are more successful in richer habitats.
Place, publisher, year, edition, pages
2015. Vol. 282, no 1801, 20142121
functional response, dispersal behaviours, space race, community dynamics
IdentifiersURN: urn:nbn:se:umu:diva-101395DOI: 10.1098/rspb.2014.2121ISI: 000350077000006OAI: oai:DiVA.org:umu-101395DiVA: diva2:839575
Originally published in manuscript form.2015-07-032015-03-302015-07-03Bibliographically approved