Data S1 Methods.

Table S1 amova results examining mtDNA sequence variation among 17 Gambusia hubbsi populations in blue holes.

Table S2 Sample sizes of wild-caught male Gambusia hubbsi from 22 blue holes (= 123).

Table S3 Description of all 51 homologous landmark locations depicted in Fig. 1c; landmarks were selected to capture shape variation in all potentially important gonopodial-tip regions.

Table S4 Eigenvector coefficients of the divergence vector (d) used to determine which relative warps (RWs) are most important in describing gonopodial-tip shape differences between predation regimes for wild-caught fish.

Table S5 Model selection results examining variation in gonopodial distal-tip shape (3 RWs) among 17 blue holes.

Figure S1 Map of study sites on Andros Island, The Bahamas.

Figure S2 Variation in gonopodial distal-tip shape of male Gambusia hubbsi in relation to predation regime (filled circles: predator present, open circles: predator absent) and phytoplankton density for (a) RW2 and (b) RW4.

Figure S3 Representative gonopodial-tip photographs from (A) four different high-predation populations and (B) four different low-predation populations.

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