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.
FOOTNOTES
Competing interests
The authors declare no competing or financial interests.
Author contributions
Conceptualization: E.A.K., M.M.R., M.L.D., C.K.G.; Methodology: E.A.K., M.M.R., M.L.D.; Validation: E.A.K.; Formal analysis: E.A.K.; Investigation: E.A.K., M.M.R., M.L.D.; Resources: E.A.K., C.K.G.; Data curation: E.A.K.; Writing - original draft: M.M.R., M.L.D.; Writing - review & editing: E.A.K., M.M.R., M.L.D., C.K.G.; Visualization: E.A.K.; Supervision: E.A.K.; Project administration: E.A.K.; Funding acquisition: E.A.K., C.K.G.
Funding
This work was supported by a National Science Foundation Postdoctoral Research Fellowship in Biology [DBI-1401560 to E.A.K.].
Data availability
All videos and data representing analyzed points have been deposited in ZMAportal.org in the study ‘Guppy feeding integration’ with permanent ID ZMA15. Calculated swim speed and mouth size data used in the statistical analysis are available from the Dryad digital repository (Kane et al., 2018): dryad.kr5rr2c.
Supplementary information
Supplementary information available online at http://jeb.biologists.org/lookup/doi/10.1242/jeb.190165.supplemental
- Received August 4, 2018.
- Accepted November 22, 2018.
- © 2019. Published by The Company of Biologists Ltd
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