Host-use pattern and sexual dimorphism reveals the mating system of the symbiotic pea crab Austinixa aidae (Crustacea: Brachyura: Pinnotheridae)
Host-use pattern and sexual dimorphism reveals the mating system of the symbiotic pea crab Austinixa aidae (Crustacea: Brachyura: Pinnotheridae)
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DOI：
10.1017/s0025315412000720
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发表时间：
2013-05-01
影响因子：
1.2
通讯作者：
Mantelatto, Fernando L.
中科院分区：
文献类型：
--
作者：
Peiro, Douglas F.;Antonio Baeza, J.;Mantelatto, Fernando L.
在巴西乌巴图巴的佩雷克-阿库海滩，一种名为Austinixa aidae的幽灵虾Callichirus major栖息在洞穴中。本文描述了A. aidae测试一夫一妻制，考虑到这种交配系统在Pinnothereliinae亚科（Pinnotheridae科）中的普遍性，A. Aidae属于。与预期相反，A。Aidae在洞穴中作为单独个体生活的频率比预期的更高。进一步的观察表明，A. Aidae表现出一夫多妻制的交配系统，雄性在洞穴中移动，寻找接受雌性。首先，只有21%的洞穴窝藏异性对螃蟹和配对螃蟹的身体大小是不相关的。这表明对不稳定性和频繁的移动洞穴之间的男性和/或女性的螃蟹，如前所述的其他共生甲壳类动物中，成对的螃蟹的身体大小是不相关的。第二，雄性与具有性接受能力（没有胚胎）或最近具有性接受能力（携带早期胚胎）的雌性配对的频率比预期的更高。上述结果与报道的那些性配对持续时间不长的物种的结果一致。第三，在爪的大小和颜色方面的两性异形是明显的。雄性的爪子比雌性的大，这一情况支持了A.阿依达。此外，雄性的体色比雌性更接近海滩的沙粒。这种性别特异性的颜色表明雄性比雌性“更适应"在海滩表面漫游寻找洞穴，因为它们的颜色应该减少被捕食者发现的风险。实验需要揭示的一夫多妻制交配系统的细节推断为A。Aidae和了解有利于共生十足类甲壳动物特定生殖策略的条件。
Austinixa aidae inhabits burrows of the ghost shrimp Callichirus major at Pereque-acu beach, Ubatuba, Brazil. We described the host-use pattern and sexual dimorphism of A. aidae to test for monogamy given the generality of this mating system in the subfamily Pinnothereliinae (family Pinnotheridae) to which A. aidae belongs. Against expectations, A. aidae lives as solitary individuals within burrows more frequently than expected by chance alone. Additional observations suggested that A. aidae exhibits a polygynandrous mating system with males moving among burrows in search of receptive females. First, only 21% of the burrows harboured heterosexual pairs of crabs and the body size of paired crabs was poorly correlated. This suggests pair instability and frequent shifts among burrows by male and/or female crabs, as reported before for other symbiotic crustaceans in which the body size of paired crabs is poorly correlated. Second, males paired with females that were sexually receptive (without embryos) or that have been receptive recently (carrying early embryos) were found more frequently than expected by chance alone. The above agrees with that reported for species in which sexual pairing does not last long. Third, sexual dimorphism in terms of claw size and coloration was evident. Claws were larger in males than in females, a condition that argues in favour of male-male competition in A. aidae. In addition, the body coloration of males was more similar to the sand grains of the beach than that of females. This sex-specific coloration suggests that males are 'better adapted' than females to roam on the surface of the beach in search of burrows because their coloration should diminish the risk of detection by predators. Experiments are needed to reveal the details of the polygynandrous mating system herein inferred for A. aidae and to understand those conditions favouring particular reproductive strategies in symbiotic decapod crustaceans.