Impact and control of feral cats preying on wandering albatrosses: Insights from a field experiment
Résumé
Invasive alien species are a major threat to seabird species, and the number of impacted species is still increasing. A recent study revealed for the first time that feral cats predated a large albatross species and that without cat control, some albatross populations would markedly decline. We examined this new predator–prey system by individually monitoring known-age wandering albatross chicks with camera traps in a colony experimentally divided into zones with and without cat control. Our design allowed us to investigate how cat control influenced cat abundance and how this in turn influenced the probability for a chick to be predated by a cat. After cat controls, cat abundance was lower in controlled zones than in uncontrolled zones, while a survival analysis showed that the probability for a chick to die from cat predation depended on the zone but not on cat abundance. Our monitoring also provided a fine-scale investigation of the various sources of chick mortality. In addition to cat predation (24% of mortality overall), our data documented predation by giant petrels, for the first time in Kerguelen, and revealed a strong and unexpected effect of nest flooding on chick mortality. Overall, our results underline the need for future studies investigating interindividual variability in cat diet and spatial ecology.
Mots clés
Diomedea exulans Felis catus feral cats field experimentation giant petrels invasive species Kerguelen management nest flooding predation wandering albatrosses
Diomedea exulans
Felis catus
feral cats
field experimentation
giant petrels
invasive species
Kerguelen
management
nest flooding
predation
wandering albatrosses
Domaines
Sciences de l'environnement
Origine : Fichiers produits par l'(les) auteur(s)