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Burrow use and sexual dimorphism as indicators of the mating system in the symbiotic pea crab Austinixa patagoniensis (Rathbun 1918) (Decapoda, Brachyura, Pinnotheridae)
Marine Ecology ( IF 1.1 ) Pub Date : 2021-08-04 , DOI: 10.1111/maec.12672
Marcio C. A. João 1, 2 , Patricio Hernáez 3
Affiliation  

Brachyuran crabs of the family Pinnotheridae De Haan are a classic example of symbiotic lifestyle. Here, we described the host-use pattern, relative growth and sexual dimorphism of Austinixa patagoniensis (Rathbun 1918), a symbiont of the ghost shrimp Callichirus major (Say 1818). We use these analyses to test the A. patagoniensis mating system considering that monogamous species inhabit their respective host as male–female pairs and have a low degree of sexual dimorphism. Austinixa patagoniensis showed a high social plasticity, with individuals inhabiting galleries in solitary, in pairs, in trios or in groups of up to eight crabs. While it is true that 38% of the burrows sampled harbored pairs of crabs, the body size of paired crabs from the opposite sex was poorly correlated. This suggests that heterosexual pairing is short term with frequent shifts among burrows by male and/or female crabs, as reported before for other symbiotic decapods in which the body size of paired crabs is poorly correlated. A considerable proportion of the ovigerous females (34%) were found living solitarily, which suggest that males abandon these females shortly after insemination. The sexual dimorphism in terms of body and cheliped size was evident in this species, a condition that argues in favor of male–male competition in A. patagoniensis. The observations above argue against the notion that A. patagoniensis is monogamous. Lastly, our results revealed that body size and chelipeds of males are not under sexual selection by females, thus reinforcing the idea that male–male competition is the mechanism behind sexual selection in A. patagoniensis.

中文翻译:

洞穴使用和性别二态性作为共生豌豆蟹 Austinixa patagoniensis (Rathbun 1918) (Decapoda, Brachyura, Pinnotheridae) 交配系统的指标

Pinnotheridae De Haan 家族的 Brachyuran 蟹是共生生活方式的典型例子。在这里,我们描述了Austinixa patagoniensis (Rathbun 1918)的宿主使用模式、相对生长和性别二态性,这是鬼虾Callichirus major (Say 1818)的共生体。我们使用这些分析来测试A. patagoniensis交配系统,考虑到一夫一妻制的物种以雄性-雌性配对的形式居住在各自的宿主中,并且性别二态性程度较低。巴塔哥尼松表现出高度的社会可塑性,个体以单独、成对、三人或最多八只螃蟹的群体居住在画廊。虽然 38% 的采样洞穴确实有成对的螃蟹,但来自异性的成对螃蟹的体型相关性很差。这表明异性配对是短期的,雄性和/或雌性螃蟹在洞穴之间频繁变化,正如之前报道的其他共生十足目动物,其中配对螃蟹的体型大小相关性较差。相当比例的卵生雌性(34%)被发现单独生活,这表明雄性在授精后不久就抛弃了这些雌性。该物种在身体和螯肢大小方面的性别二态性在该物种中很明显,这种情况有利于雄性 - 雄性竞争巴塔哥尼松。上述观察结果与A. patagoniensis是一夫一妻制的观点相反。最后,我们的研究结果表明,车身尺寸和男性的螯足就不在性选择的女性,从而强化了想法,雄性之间的竞争背后是性选择的机制A. patagoniensis
更新日期:2021-08-04
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