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Social monogamy in the shrimp Pontonia margarita, a symbiont of Pinctada mazatlanica, off the Pacific coast of Panama

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Abstract

A previous study predicted the evolution of monogamy in symbiotic crustaceans inhabiting scarce, relatively small hosts in tropical environments where predation risk away from hosts is high. This prediction was tested in the shrimp Pontonia margarita, which inhabits the pearl oyster Pinctada mazatlanica. A total of 68 oysters were collected from the intertidal and shallow subtidal at two islands (Islas Secas [N 27° 55′, W 82° 03′] and Isla de La Coiba [N 27° 50′, W 97° 03′]) off the eastern tropical Pacific coast on 15 and 17 March 2007, respectively. The population structure, distribution, male-female association pattern, and relative growth of the major claw and pleura of the second abdominal segment of each shrimp retrieved were examined. Shrimps were found as heterosexual pairs in the mantle cavity of hosts more frequently than would be expected by chance alone. Males occurred with females in the same host, independent of the reproductive condition of the female or the stage of development of brooded embryos. This observation, and strong correlations between the host and shrimp body size in both males and females suggest a long-term association between males and females in each host. Sexual dimorphism in body size was minor, with males being just slightly smaller than females. In agreement with predictions for monogamous species, the major claw of males did not display positive allometry, which has been generally reported for polygamous shrimps. In turn, the pleura of the second abdomen presented negative allometry in males but positive allometry in females. All available information suggests that Pontonia margarita has a socially monogamous mating system with males and females forming exclusive pairs in their hosts.

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Acknowledgments

I am grateful for the support from a Smithsonian Tropical Research Institute (STRI) Postdoctoral Fellowship and a Smithsonian Marine Station (SMS) Postdoctoral Fellowship. Thanks to R. Collin for inviting me to participate on the research cruise to Islas Secas, Isla de la Coiba, and other islands in the tropical eastern Pacific on the R/V Urraca, STRI, Panama. The comments by Dr. Judy Grassle and three anonymous reviewers substantially improved this manuscript. Thanks to Jennifer Reitz for improving the English of the manuscript.

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  1. Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa, Ancón, Republic of Panama

    J. Antonio Baeza

  2. Smithsonian Marine Station at Fort Pierce, 701 Seaway Drive, Fort Pierce, FL, 34949, USA

    J. Antonio Baeza

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  1. J. Antonio Baeza
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Correspondence to J. Antonio Baeza.

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Communicated by J.P. Grassle.

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Baeza, J.A. Social monogamy in the shrimp Pontonia margarita, a symbiont of Pinctada mazatlanica, off the Pacific coast of Panama. Mar Biol 153, 387–395 (2008). https://doi.org/10.1007/s00227-007-0815-9

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