Social monogamy in the cleaning goby Elacatinus evelynae: ecological constraints or net benefit?
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| Authors: | Whiteman, EA; Côté, IM |
| Year: | 2003 |
| Journal: | Animal Behaviour 66: 281-291 |
| Title: | Social monogamy in the cleaning goby Elacatinus evelynae: ecological constraints or net benefit? |
| Abstract: | We tested predictions from four hypotheses to explain the occurrence of long-term socially monogamous pairs in the Caribbean cleaning goby Elacatinus (=Gobiosoma) evelynae, namely (1) resource limitation, (2) low population and/or low mate density, (3) territorial defence and (4) net benefit of single-mate sequestration. We found no evidence that resources, in terms of available cleaning stations or clients to clean, were limited (1) or that after experimental goby removals, single individuals could not maintain cleaning stations alone (2). Population density was low but this did not prevent artificially widowed fish from remating quickly with individuals as large as their initial partners (3). Social monogamy in E. evelynae appears to result from the benefits associated with sequestering a large, high-quality mate (4). Both males and females showed intrasexual aggression towards experimental intruders consistent with mate guarding. Opportunities for polygynous matings by males, assessed by comparing the sizes, distances between and mating synchrony of neighbouring pairs, appeared both low and of limited value. Males therefore benefit most from guarding a larger, more fecund female. Females spent longer cleaning when paired with a large male, indicating that the benefits of guarding a high-quality mate may extend outside of the reproductive period for socially monogamous species. These results add to an increasing number of studies on coral reef fish showing mate-guarding behaviour and benefits to males and females from sequestering a single mate. (C) 2003 Published by Elsevier Ltd on behalf of The Association for the Study of Animal Behaviour. |
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