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Environmental correlates of diet in the swordtail characin (Corynopoma riisei, gill)

Summary: Environmental correlates of diet in the swordtail characin
(Corynopoma riisei, gill)
Niclas Kolm & Göran Arnqvist
Received: 8 March 2010 /Accepted: 4 April 2011 /Published online: 27 April 2011
# Springer Science+Business Media B.V. 2011
Abstract In the sexually dimorphic swordtail chara-
cin (Corynopoma riisei, Gill), males are equipped
with an opercular flag-ornament that has been
suggested to function as a food-mimic since females
bite at the ornament during courtship. However,
virtually nothing is known about the diet in wild
populations of this species. In this study, we first
investigated composition of and variation in the diet
of C. riisei across 18 different populations in
Trinidad, using gut content analyses. We then related
variation in gut content to habitat features of
populations to investigate the potential link between
environmental conditions and prey utilization. Our
results showed that the dominating food type in the
gut was various terrestrial invertebrates, both adults


Source: Arnqvist, Göran - Department of Animal Ecology, Uppsala Universitet


Collections: Environmental Sciences and Ecology