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首页> 外文期刊>Marine ecology >Does the same refuge signify the same reproductive tactics? Comparing the mating systems of two symbiont alpheid shrimps (Crustacea: Decapoda)
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Does the same refuge signify the same reproductive tactics? Comparing the mating systems of two symbiont alpheid shrimps (Crustacea: Decapoda)

机译：Does the same refuge signify the same reproductive tactics? Comparing the mating systems of two symbiont alpheid shrimps (Crustacea: Decapoda)

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Animal populations can present different mating tactics according to the number ofmates males or females obtain. The limiting factors for copulation in symbiont crustaceansare the size, structural complexity, and density of refuge, in addition to predationrisk outside their shelters. In this study, we aimed to investigate, comparatively,if the occupation of the same refuge leads to the same reproductive tactic in twosymbiont species of alpheid shrimps. For this purpose, we described the populationdistribution of Alpheus estuariensis, a burrowing shrimp, and Salmoneus carvachoi, atenant species, in an intertidal mudflat in Pernambuco, northeastern Brazil. Alpheusestuariensis experiences sexual dimorphism relative to body and cheliped size, wheremales present larger body sizes and allocate more resources to cheliped growth thanfemales. However, both males and females presented positive allometric growth inchelipeds. In S. carvachoi, male-phaseindividuals reach smaller body sizes than hermaphrodites.Male-phaseshrimps experience positive allometry in cheliped size,while hermaphrodites do not. Both species were found inhabiting burrows as sexualpairs more frequently than expected by chance. Paired females of A. estuariensis werefound carrying embryos more frequently than solitary ones. We did not find a statisticaldifference between the frequency of single and paired ovigerous hermaphroditesin S. carvachoi. Our results indicate that A. estuariensis is social monogamous, while S.carvachoi is promiscuous. We argue that different biological and ecological aspects ofthese species could explain the distinct tactics adopted by them. Alpheus estuariensisdigs its own refuge and is a much larger species, bearing a more robust chelipedthan S. carvachoi. Thus, we argue that the burrowing species (A. estuariensis) shouldmonopolize and defend their refuge, and S. carvachoi only takes advantage of thisresource.

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