Asymmetric dispersal can maintain larval polymorphism: a model motivated by Streblospio benedicti.
Asymmetric dispersal can maintain larval polymorphism: a model motivated by Streblospio benedicti.
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不对称扩散可以维持幼虫多态性:由 Streblospio benedicti 激发的模型。
DOI:
10.1093/icb/ics055
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发表时间:
2012
影响因子:
2.6
通讯作者:
Hall,DavidW
中科院分区:
文献类型:
--
作者:
Zakas,Christina;Hall,DavidW
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 polychaeteStreblospio benedictihas 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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