Rosenfeld Sebastián, Marambio Johanna, Ojeda Jaime, González-Wevar Claudio, Gerard Karin, Pizarro Gemita, Mansilla Andrés
Laboratorio de Ecosistemas Marinos Antárticos y Subantárticos, Universidad de Magallanes, Casilla 113-D, Punta Arenas, Chile.
Instituto de Ecología y Biodiversidad (IEB) Casilla 653, Santiago, Chile.
Zookeys. 2018 Feb 19(738):1-25. doi: 10.3897/zookeys.738.21175. eCollection 2018.
Interactions between algae and herbivores can be affected by various factors, such as seasonality and habitat structure. Among herbivores inhabiting marine systems, species of the order Patellogastropoda are considered key organisms in many rocky coasts of the world. species are one of the most dominant macro-herbivores on the rocky shores of the sub-Antarctic ecoregion of Magellan. However, the importance of its key role must be associated with its trophic ecology. The objective of this work was to evaluate spatial and temporal variabilities in the dietary composition of two intertidal species, considering grazing on macro- (macroalgae) and microscopic (periphyton) food. The composition of periphyton and the availability of macroalgae in the winter and summer seasons were examined at two localities of the Magellanic province, alongside the gut contents of and . The dietary composition differed between the two species, as well as between seasons and locations. The differences observed in the diet of the two species of may be mainly due to their respective distributions in the intertidal zone. Both species presented a generalist strategy of grazing, which is relationed to the seasonality of micro- and macroalgae availability and to the variability of the assemblages between the localities. This research was the first to perform a detailed study of the diet of intertidal species.
藻类与食草动物之间的相互作用会受到多种因素的影响，如季节性和栖息地结构。在栖息于海洋系统的食草动物中，笠形腹足目物种被认为是世界上许多岩石海岸的关键生物。笠形腹足目物种是麦哲伦次南极生态区岩石海岸上最具优势的大型食草动物之一。然而，其关键作用的重要性必须与其营养生态学相关联。这项工作的目的是评估两种潮间带笠形腹足目物种饮食组成的时空变异性，同时考虑对大型食物（大型藻类）和微观食物（附生植物）的摄食情况。在麦哲伦省的两个地点，研究了冬季和夏季附生植物的组成以及大型藻类的可利用性，并分析了两种笠形腹足目物种的肠道内容物。两种笠形腹足目物种的饮食组成不同，季节和地点之间也存在差异。两种笠形腹足目物种在饮食上观察到的差异可能主要归因于它们在潮间带的各自分布。这两个物种都呈现出一种广食性的摄食策略，这与微型和大型藻类可利用性的季节性以及不同地点之间群落的变异性有关。这项研究首次对潮间带笠形腹足目物种的饮食进行了详细研究。
