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Partitioning of the feeding niche along spatial, seasonal and size dimensions by the fish community in a tropical Bay in Southeastern Brazil

机译：巴西东南部热带海湾鱼类群落沿空间，季节和大小维度划分的摄食位

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摘要

Feeding guilds and spatial, seasonal and ontogenetic changes in the diets of 24 fish species in a tropical bay in Southeastern Brazil were examined. The hypotheses tested were that groups of species form specific trophic guilds and that the feeding partitioning differs along the niche dimensions. Five trophic guilds (Polychaeta, Copepoda, Teleostei, Teleostei/Crustacea and Polychaeta/Crustacea) and two species with specialised feeding, one teleost (Aspistor luniscutis) and one bivalvia (Sphoeroides testudineus), were found. Polychaeta was the most important resource for nine fish species, followed by Copepoda (6 spp.), Teleostei (5 spp.) and Caprelidae Amphipoda (3 spp.). Polychaeta was the most used resource for species in the inner bay zone, and Crustaceans in the outer bay zone. We detected a predominance of Polychaeta between the spring and autumn, whereas crustaceans were consumed at a greater rate in the winter. The most conspicuous changes in diet occurred along the spatial and seasonal dimensions, rather than the size dimensions. The hypotheses tested were accepted. Identifying and incorporating information about the bay food web is a first step towards developing management strategies that are sensitive to this particular ecosystem.
机译：在巴西东南部的一个热带海湾，对24种鱼类的饮食行会以及空间，季节和个体发生的变化进行了研究。检验的假设是，物种的组形成特定的营养行会，并且进食分区沿生态位维度不同。发现了五个有营养的行会（Polychaeta，Copepoda，Teleostei，Teleostei /甲壳纲和Polychaeta /甲壳纲）和两个具有专门饲养的物种，其中一个硬骨鱼（Aspistor luniscutis）和一个双壳纲（Sphoeroides testudineus）。 Polychaeta是9种鱼类的最重要资源，其次是Co足目（6 pppp），Teleostei（5 pppp）和Cap鱼（Caprelidae Amphipoda）（3 pppp）。 Polychaeta是内湾区和外湾区甲壳动物最常用的物种资源。我们在春季和秋季之间发现了Polychaeta的优势，而在冬季，甲壳类动物的消耗量更大。饮食中最明显的变化发生在空间和季节方面，而不是大小方面。接受检验的假设。识别和整合有关海湾食物网的信息是制定对这一特定生态系统敏感的管理策略的第一步。

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