González-Ortegón Enrique, Perez-Miguel Marta, Navas Jose I, Drake Pilar, Cuesta Jose A
Instituto de Ciencias Marinas de Andalucía (ICMAN-CSIC), Campus Universitario Rio San Pedro, Avda. República Saharaui, 2, 11519, Cádiz, Puerto Real, Spain.
Unidad Asociada Crecimiento Azul CSIC-IFAPA, El Puerto de Santa María Spain, Spain.
Curr Zool. 2021 Feb 24;68(2):185-197. doi: 10.1093/cz/zoab013. eCollection 2022 Apr.
The study of the recent colonization of a symbiont and its interaction with host communities in new locations is an opportunity to understand how they interact. The use of isotopic ratios in trophic ecology can provide measurements of a species' isotopic niche, as well as knowledge about how the isotopic niches between symbiont and host species overlap. Stable isotope measurements were used to assess the sources of carbon assimilated by the host species (the bivalves and ) and their associated symbiont pea crab , which occurs within these bivalves' mantle cavities. The mixing model estimates suggest that all of them assimilate carbon from similar sources, particularly from pseudofaeces and particulate organic matter in this symbiotic system based on filter feeding. The symbiotic species occupy comparable trophic levels and its association seems to be commensal or parasitic depending on the duration of such association. The pea crab reflects a sex-specific diet, where males are more generalist than the soft females because the latter's habitat is restricted to the host bivalve. The high isotopic overlap between soft females and may reflect a good commensal relationship with the host.
研究共生体在新地点的近期定殖及其与宿主群落的相互作用，是了解它们如何相互作用的一个契机。在营养生态学中使用同位素比率可以测量一个物种的同位素生态位，以及了解共生体和宿主物种之间的同位素生态位如何重叠。利用稳定同位素测量来评估宿主物种（双壳贝类和）及其相关共生体豌豆蟹所同化的碳源，豌豆蟹存在于这些双壳贝类的外套腔中。混合模型估计表明，它们都从相似的来源同化碳，特别是在这个基于滤食的共生系统中，从伪粪便和颗粒有机物中同化碳。共生物种占据相当的营养级，其关联似乎是共栖或寄生关系，这取决于这种关联的持续时间。豌豆蟹体现出一种性别特异性的饮食，雄性比雌性更具通用性，因为雌性的栖息地仅限于宿主双壳贝类。雌性与宿主之间较高的同位素重叠可能反映出与宿主良好的共栖关系。
