Can cat predation help competitors coexist in seabird communities? - Archive ouverte HAL Access content directly
Journal Articles Journal of Theoretical Biology Year : 2009

Can cat predation help competitors coexist in seabird communities?

Dominique Pontier
Connectez-vous pour contacter l'auteur
David Fouchet
  • Function : Author
  • PersonId : 1102251
J. Joël Bried
  • Function : Author
  • PersonId : 890471

Abstract

On oceanic islands, nest site availability can be an important factor regulating seabird population dynamics. The potential for birds to secure a nest to reproduce can be an important component of their life histories. The dates at which different seabird species arrive at colonies to breed will have important consequences for their relative chances of success. Early arrival on the island allows birds to obtain nests more easily and have higher reproductive success. However, the presence of an introduced predator may reverse this situation. For instance, in the sub-Antarctic Kerguelen archipelago, early-arriving birds suffer heavy predation from introduced cats. Cats progressively switch from seabirds to rabbits, since the local rabbit population starts to peak after early-arriving seabird species have already returned to the colony. When late-arriving birds arrive, cat predation pressure on seabirds is thus weaker. In this paper, we investigate the assumption that the advantage of early nest monopolization conferred to early-arriving birds may be counterbalanced by the cost resulting from predation. We develop a mathematical model representing a simplified situation in which two insular seabird species differ only in their arrival date at the colony site and compete for nesting sites. We conclude that predation may ensure the coexistence of the two bird species or favor the late-arriving species, but only when seasonal variations in predation pressure are large. Interestingly, we conclude that arriving early is only favorable until a given level where high reproductive success no longer compensates for the long exposure to strong predation pressure. Our work suggests that predation can help maintain the balance between species of different phenologies.
Fichier principal
Vignette du fichier
PEER_stage2_10.1016%2Fj.jtbi.2009.09.006.pdf (545.91 Ko) Télécharger le fichier
Origin Files produced by the author(s)
Loading...

Dates and versions

hal-00559157 , version 1 (25-01-2011)

Identifiers

Cite

Dominique Pontier, David Fouchet, J. Joël Bried. Can cat predation help competitors coexist in seabird communities?. Journal of Theoretical Biology, 2009, 262 (1), pp.90. ⟨10.1016/j.jtbi.2009.09.006⟩. ⟨hal-00559157⟩

Collections

PEER
35 View
149 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More