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Updated: Jan 30, 2026

Swimming Performance Assessment in Fishes
Published on: May 20, 2011
Integration between swim speed and mouth size evolves repeatedly in Trinidadian guppies and aligns with
Emily A Kane1, Megan M Roeder2, McKenna L DeRue2
1Department of Biology, Georgia Southern University, PO BOX 8042-1, Statesboro, GA 30458, USA ekane@georgiasouthern.edu.
Abstract:
Well-supported correlations between swim speed and mouth size during prey capture suggest the broad existence of an integrated relationship between locomotion and feeding in suction-feeding fishes. However, the influence of specialization on this relationship is unclear. We used divergent populations of Trinidadian guppies (Poecilia reticulata) to test whether integration during suction is generalizable to a non-suction specialist and whether intraspecific specialization of component systems affects their integration. Guppies from replicate high- and low-predation streams were recorded capturing wild-type zooplankton using suction. Alternative general linear models supported a positive correlation between swim speed and mouth size in derived low-predation populations, suggesting that the relationship can be extended in some cases. High-predation populations lack this integration, which may be the result of direct selection or constraints imposed by selection on locomotion. As guppies invade new habitats they may be evolving a new, integrated performance phenotype from a non-integrated ancestor.
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