PT  - JOURNAL ARTICLE
AU  - Kane, Emily A.
AU  - Roeder, Megan M.
AU  - DeRue, McKenna L.
AU  - Ghalambor, Cameron K.
TI  - Integration between swim speed and mouth size evolves repeatedly in Trinidadian guppies and aligns with suction-feeding fishes
AID  - 10.1242/jeb.190165
DP  - 2019 Jan 15
TA  - The Journal of Experimental Biology
PG  - jeb190165
VI  - 222
IP  - 2
4099  - http://jeb.biologists.org/content/222/2/jeb190165.short
4100  - http://jeb.biologists.org/content/222/2/jeb190165.full
SO  - J. Exp. Biol.2019 Jan 15; 222
AB  - 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.