Asymmetric dispersal can maintain larval polymorphism: a model motivated by Streblospio benedicti.

Integrative and Comparative Biology
Christina Zakas, David W Hall

Abstract

Polymorphism in traits affecting dispersal occurs in a diverse variety of taxa. Typically, the maintenance of a dispersal polymorphism is attributed to environmental heterogeneity where parental bet-hedging can be favored. There are, however, examples of dispersal polymorphisms that occur across similar environments. For example, the estuarine polychaete Streblospio benedicti has a highly heritable offspring dimorphism that affects larval dispersal potential. We use analytical models of dispersal to determine the conditions necessary for a stable dispersal polymorphism to exist. We show that in asexual haploids, sexual haploids, and in sexual diploids in the absence of overdominance, asymmetric dispersal is required in order to maintain a dispersal polymorphism when patches do not vary in intrinsic quality. Our study adds an additional factor, dispersal asymmetry, to the short list of mechanisms that can maintain polymorphism in nature. The region of the parameter space in which polymorphism is possible is limited, suggesting why dispersal polymorphisms within species are rare.

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Citations

Apr 13, 2012·Integrative and Comparative Biology·K Emily Knott, Damhnait McHugh
Feb 12, 2014·Interface Focus·Anne Duputié, François Massol
Dec 5, 2015·Evolution; International Journal of Organic Evolution·Ryan A Ellingson, Patrick J Krug
Oct 15, 2013·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Luis Ovidiu PopaVictor Surugiu
Sep 30, 2016·Proceedings. Biological Sciences·Delphine LegrandMichel Baguette
Jul 6, 2019·PLoS Computational Biology·Jane LovelessBarbara Webb

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