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首页> 外文期刊>Oceanographic Literature Review >Macroalgal, seagrass and mangrove communities
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Macroalgal, seagrass and mangrove communities

机译：大型藻类，海草和红树林群落

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Bottom-up (e.g. resource quality) and top-down (e.g. predation) factors have strong effects on the fitness and distribution of small herbivores. Herein, we investigated how food quality and refuge offered by macroalgal hosts influence the distribution of a me-sograzer. We used the herbivorous amphipod Cymadusa filosa and seasonally evaluated its association with the macroalgal hosts Sargassum filipendula, Padina gymnospora, and Dichotomaria marginata on a subtropical rocky shore from the Brazilian southeastern coast. Feeding experiments were conducted to test the food value of hosts, while predation experiments in the field and laboratory were performed to investigate the refuge value of the macroalgae. Cymadusa occurred on Padina in a density greater than that observed on Dichotomaria and Sargassum, while Dichotomaria harbored more amphipods than Sargassum. Adults of Cymadusa showed a higher consumption of Padina and Sargassum in both choice and no-choice feeding experiments and juveniles had greater growth and reproductive potential when feeding on such macroalgae. In the predation experiment in the field, Padina was a better refuge for Cymadusa than Sargassum. However, no difference in refuge value among hosts was observed in the laboratory assays. The distribution of Cymadusa was explained by a balance between food and refuge values of hosts, with higher abundances being observed in the high-quality food alga that provides refuge against predators (e.g. Padina), while fewer individuals occurred in other high-quality food that was less suitable as refuge (e.g. Sargassum). Therefore, predation may be more of a determinant for distribution of that mesograzer than resource quality.
机译：自下而上（例如资源质量）和自上而下（例如捕食）因素对小型草食动物的适应性和分布有很大影响。在这里，我们调查了大型藻类寄主提供的食物质量和避难所如何影响中型食草动物的分布。我们使用了草食性两栖类Cymadusa filosa，并季节性评估了其与巴西东南沿海亚热带岩石海岸上的大型藻类寄主Sargassum filipendula，Padina Gymnospora和Dichotomaria marginata的关联。进行饲喂实验以检验宿主的食物价值，同时在野外和实验室进行捕食实验以研究大型藻类的避难所价值。 Cymadusa发生在Padina上的密度大于Dichotomaria和Sargassum上观察到的密度，而Dichotomaria携带的两栖类动物比Sargassum多。在选择和无选择喂养实验中，Cymadusa的成年动物均显示较高的Padina和Sargassum食用量，而以此类大型藻类为食的幼鱼则具有更大的生长和繁殖潜力。在野外的捕食实验中，帕迪纳（Padina）是Cymadusa的避难所，比Sargassum好。但是，在实验室检测中，宿主之间的避难所值没有差异。 Cymadusa的分布可通过食物和寄主的避难所值之间的平衡来解释，其中高品质的食物藻类提供了对捕食者（例如Padina）的避难所，而在其他高质量的食物中不太适合作为避难所（例如Sargassum）。因此，掠夺可能比分配资源质量更能决定该中型放牧者的分布。

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    《Oceanographic Literature Review》 |2019年第5期|1073-1075|共3页
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