Description
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Abstract We compared ancestral anadromous-marine and nonmigratory, stream-resident threespine stickleback (Gasterosteus aculeatus) populations to examine the outcome of relaxed selection on prolonged swimming performance. We reared marine and stream-resident fish from two locations in a common environment and found that both stream-resident populations had lower critical swimming speeds (Ucrits) than marine populations. F1 hybrids from the two locations displayed significant differences in dominance, suggesting that the genetic basis for variation in Ucrit differs between locations. To determine which traits evolved in conjunction with, and may underlie, differences in performance capacity we measured a suite of traits known to affect prolonged swimming performance in fishes. While some candidate traits did not evolve (standard metabolic rate and two body shape traits), multiple morphological (pectoral fin size, shape and four body shape measures) and physiological (maximum metabolic rate; MMR) traits evolved in the predicted direction in both stream-resident populations. However, data from F1 hybrids suggested that only one of these traits (MMR) had dominance effects similar to those of Ucrit in both locations. Overall, our data suggest that reductions in prolonged swimming performance were selected for in non-migratory populations of threespine stickleback, and that decreases in MMR may mediate these reductions in performance. (2020-06-24)
Usage notes R_ScriptR script to re-produce analyses run in Dalziel et al. 2011Fig2_Ucrit_RRaw prolonged swimming speed data (Ucrit) associated with Figure 2Fig3_PecFinSA_RRaw pectoral fin surface area data (residuals of mass and standard length). Figure 3 of Dalziel et al. 2011.PecFinShapelandmarks_UnalignedTPSTPS file of 6 pectoral fin landmarks from Fig.3. Note that these landmarks must be aligned in TpsRelw prior to further analysisFig3_PecFinshape_RRaw data for pectoral fin shape (aligned landmarks), and DFA analysis.Fig4_BodyShape_RCorrected measures of stickleback body shape (see methods) and results of DFA.BodyShape12LandmarksTPS file for use in TmorphGen. Can be used to calculate distances between 12 landmarks from Fig. 4.Fig5_SMR_RRaw standard metabolic rate data.Fig5_MMR_RRaw maximum metabolic rate dataDominanceModelR script for dominance modelDominance_modelUcritdata_RRaw data for testing for differences in dominance among locations (Bonsall and West Creeks)in R. (2020-06-24)
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Notes
| Dryad version number: 1
Version status: submitted
Dryad curation status: Published
Sharing link: https://datadryad.org/stash/share/TtPf7LdW9o78tCgnIjQlz6sQIXvDfiUBnboV9MG4dcs
Storage size: 294142
Visibility: public |