Guppy populations differ in cannibalistic degree and adaption to structural environments
(English)Manuscript (preprint) (Other academic)
We investigated the degree of cannibalism in guppy (Poecilia reticulata) populations originating from high and low predation environments in Trinidad and how cannibalism was affected by the presence of refuges. Females from two populations were allowed to feed on juveniles from two populations in aquaria trials. The cannibalism was size-dependent and varied depending on both juvenile and female origin. Low predation females were more efficient cannibals and low predation juveniles were better at avoiding cannibalism compared to high predation guppies when no refuges were present. The addition of refuges decreased cannibalism when females from the low predation population were feeding on juveniles from the high predation population. In contrast, cannibalism increased with the addition of refuges for all other combinations. The high predation females were also superior cannibals and the high predation juveniles were better at escaping cannibalism than the low predation guppies with refuges present. We discuss whether the differences in cannibalism and response to refuge addition relate to predation induced habitat shifts and differences in the guppies’ natural environment.
Cannibalism, size-dependence, habitat use, structural heterogeneity, predation
IdentifiersURN: urn:nbn:se:umu:diva-36129OAI: oai:DiVA.org:umu-36129DiVA: diva2:352121