Parasitism in ecosystem engineer species: a key factor controlling marine ecosystem functioning,Journal of Animal Ecology

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Parasitism in ecosystem engineer species: a key factor controlling marine ecosystem functioning
Journal of Animal Ecology ( IF 3.5 ) Pub Date : 2020-05-04 , DOI: 10.1111/1365-2656.13236
Ludovic Pascal _{1,

2} , Antoine Grémare _{1,

2} , Xavier de Montaudouin _{1,

2} , Bruno Deflandre _{1,

2} , Alicia Romero-Ramirez _{1,

2} , Olivier Maire _{1,

2}

Affiliation

Although parasites represent a substantial part of marine communities' biomass and diversity, their influence on ecosystem functioning, especially via the modification of host behaviour, remains largely unknown. Here, we explored the effects of the bopyrid ectoparasite Gyge branchialis on the engineering activities of the thalassinid crustacean Upogebia pusilla and the cascading effects on intertidal ecosystem processes (e.g. sediment bioturbation) and functions (e.g. nutrient regeneration). Laboratory experiments revealed that the overall activity level of parasitized mud shrimp is reduced by a factor 3.3 due to a decrease in time allocated to burrowing and ventilating activities (by a factor 1.9 and 2.9 respectively). Decrease in activity level led to strong reductions of bioturbation rates and biogeochemical fluxes at the sediment-water interface. Given the worldwide distribution of mud shrimp and their key role in biogeochemical processes, parasite-mediated alteration of their engineering behaviour has undoubtedly broad ecological impacts on marine coastal systems functioning. Our results illustrate further the need to consider host-parasite interactions (including trait-mediated indirect effects) when assessing the contribution of species to ecosystem properties, functions and services.

中文翻译：

生态系统工程物种的寄生性：控制海洋生态系统功能的关键因素

尽管寄生虫代表了海洋群落生物量和多样性的重要组成部分，但它们对生态系统功能的影响，尤其是通过宿主行为的改变，在很大程度上仍然未知。在这里，我们探讨了 bopyrid 外寄生虫 Gyge branchialis 对海生甲壳动物 Upogebia pusilla 工程活动的影响以及对潮间带生态系统过程（例如沉积物生物扰动）和功能（例如营养再生）的级联效应。实验室实验表明，由于分配给挖洞和通风活动的时间减少（分别减少了 1.9 和 2.9 倍），寄生泥虾的总体活动水平降低了 3.3 倍。活动水平的降低导致沉积物-水界面的生物扰动率和生物地球化学通量的大幅降低。鉴于泥虾的全球分布及其在生物地球化学过程中的关键作用，寄生虫介导的工程行为改变无疑对海洋沿海系统功能产生了广泛的生态影响。我们的结果进一步说明，在评估物种对生态系统特性、功能和服务的贡献时，需要考虑宿主-寄生虫的相互作用（包括性状介导的间接影响）。

更新日期：2020-05-04

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