Effects of conspecific associations on size at sex change in three species of calyptraeid gastropods
Effects of conspecific associations on size at sex change in three species of calyptraeid gastropods
复制标题
DOI：
10.3354/meps293089
复制
发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
Bailey-Jourdain, C
中科院分区：
文献类型：
--
作者：
Collin, R;McLellan, M;Bailey-Jourdain, C
在海洋软体动物中，性别变化通常是不稳定的，并且被认为在很大程度上受到与同种动物相互作用的影响。先前对盘足纲腹足类动物的研究得出结论，它们的社会环境影响着雌雄同体变性的时间。我们通过实地调查和实验室实验，研究了同种异体对3种巴拿马斑蝶变性时体型的影响。Crepidula cf. onyx、C. incurva Broderip（1834）和Bostrycapulus calyptraeformis （Des-hayes, 1830）在密度、性别比和发育方式上存在差异，表明它们可能以不同的方式对同种虫的关联做出反应。然而，我们的实验室实验表明，与同种特异性相互作用的反应通常是相似的。在这三个物种中，单独饲养的个体都经历了一个雄性阶段，单独饲养的雄性在与另一只雄性一起饲养的雄性一样大的时候改变了性别。C. C.缟玛瑙和C. C. incurva在与雌性一起饲养时，其性别变化比单独饲养或与另一雄性一起饲养时更大。两种处理之间在性别变化时的大小差异很小，处理效果更多地解释了C. cf. onyx在性别变化时的大小差异，C. cf. onyx是更孤独的物种，而C. incurva通常是成对发现的物种。在所有物种中，初始生长率高的个体比初始生长率低的个体更早改变性别，体型也更小。在性别变化过程中，缟玛虫草和隐球菌的生长速率显著提高，而萼状芽孢杆菌的生长速率则没有显著提高。
In marine molluscs, sex change is often labile and is thought to be largely influenced by interactions with conspecifics. Previous studies of calyptraeid gastropods concluded that their social environment influences the timing of protandrous sex change. We conducted field surveys and laboratory experiments to examine the effects of conspecifics on size at sex change in 3 Panamanian calyptraeids. Crepidula cf. onyx, C. incurva Broderip, 1834 and Bostrycapulus calyptraeformis (Des-hayes, 1830) vary in densities, sex ratio and mode of development, which suggests that they might respond to associations with conspecifics in different ways. However, our laboratory experiments showed that the response to interactions with conspecifics is generally similar. In all 3 species, individuals raised in isolation pass through a male phase and males raised alone change sex at the same size as males raised with another male. Both C. cf. onyx and C. incurva change sex at a larger size when kept with a female than when kept alone or with another male. The differences in size at sex change between the treatments is small and the treatment effect explains more of the variation in size at sex change in C. cf. onyx, the more solitary species, than in C. incurva, a species that is usually found in pairs. In all species, individuals with high initial growth rates change sex sooner and at a smaller size than those with slower initial growth rates. Growth rates increase significantly during sex change in C. cf. onyx and C. incurva but not in B. calyptraeformis.