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Conspicuous signal evolution in heterogeneous environments

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Abstract

A fundamental prediction of reproductive signal evolution is that selection should favor male courtship signals that are conspicuous with respect to the surrounding media. However, many species live in heterogeneous environments where spatiotemporal variability can degrade the efficacy of signals tuned to specific conditions. One rarely considered solution to this problem is to evolve generalized signals that can effectively transmit information under most of the conditions that are likely to be encountered. Here, I present results from a study of a freshwater fish, the brook stickleback (Culaea inconstans) that are consistent with the hypothesis that sexually dimorphic body coloration has been driven by selection for conspicuousness under multiple environmental conditions. In choice tests, females showed no bias favoring a conspicuous black stimulus in simulated oligotrophic stream conditions, but showed a strong and equal bias for the black phenotype in simulated dystrophic and eutrophic streams. These data indicate that the evolution of signals that maximize achromatic contrast with the surrounding environment may be an effective mechanism for maintaining conspicuousness in heterogeneous visual environments. The repeated evolution of black color signals by stream fishes may therefore represent a specific example of this general evolutionary mechanism.

Significance statement

For active female mate choice to occur, a female must detect a male before she can choose him. Hypotheses of reproductive signal evolution based on male conspicuousness have primarily focused on the relationship between signal structure and a particular set of environmental parameters. However, many species live in environments that are variable. The results of mate-choice tests conducted in this study are consistent with the hypothesis that melanic reproductive color signaling in male brook stickleback (Culaea inconstans) has evolved to maximize the likelihood of detection and approach by females in heterogeneous environments. These results extend our understanding of signal evolution based on transmission efficacy and may explain the repeated evolution of melanic body coloration (bars, patches, and full-body coloration) in freshwater fishes.

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Acknowledgments

I am grateful to Deborah McLennan for discussions and resources, and Paul Venturelli for comments on an earlier version of the study. I am also grateful to three reviewers for their thoughtful comments on the manuscript.

Funding

Funding for this study was provided by an Animal Behavior Society Student Research Grant to JLW.

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Authors and Affiliations

  1. Department of Biology, Ball State University, Cooper Life Science Building, 2111 W. Riverside Ave., Muncie, IN, 47306, USA

    Jessica L. Ward

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  1. Jessica L. Ward
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Correspondence to Jessica L. Ward.

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Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. This study was carried out in strict accordance with the requirements of the Ontario’s Animals for Research Act. The University Animal Care Committee of the University of Toronto approved all protocols for research, housing, and the maintenance of fish (protocol number 20005656).

Conflict of interest

The author declares that she has no conflict of interest.

Additional information

Communicated by J. Frommen

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Ward, J.L. Conspicuous signal evolution in heterogeneous environments. Behav Ecol Sociobiol 72, 119 (2018). https://doi.org/10.1007/s00265-018-2530-6

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  • DOI: https://doi.org/10.1007/s00265-018-2530-6

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