Laboratório de Ecologia Reprodutiva e do Recrutamento de Organismos Marinhos, Instituto Oceanográfico (IO), Universidade de São Paulo (USP), Praça do Oceanográfico 191, PC 05508-120 São Paulo, Brazil.
J Fish Biol. 2012 May;80(6):2357-73. doi: 10.1111/j.1095-8649.2012.03300.x.
The feeding ecology of the American freshwater goby Ctenogobius shufeldti in a low salinity salt-marsh habitat in the Paranaguá Bay estuarine complex (Brazil) was assessed through the gut analysis of 632 individuals. The effects of a set of abiotic factors (type of sediment, salinity, temperature and estuarine reach), season and body size on dietary composition were analysed. Seasonal and size-related changes in feeding strategy, feeding intensity and trophic level were assessed. The effects of gape and body size on prey size use were also analysed. The results showed that C. shufeldti is a typical omnivorous, generalized benthic predator of low trophic levels throughout the seasons and size classes, feeding on 56 dietary items; tanaids, chlorophyte algae, ostracods, gastropods, detritus and benthic diatoms made up the bulk of its diet. The tanaid Kalliapseudes schubarti was the main prey item in both numerical and volumetric terms. The gut fullness was persistently high across the seasons. As expected for a typical generalized, opportunistic omnivorous feeder: (1) seasonal and spatial-temporal variability of abiotic factors had a significant effect on diet structure, (2) season accounted for most of the dietary variation and (3) diet composition and the size of prey consumed did not vary across the size classes.
采用胃内容物分析法对巴拉那瓜湾河口复杂生境中低盐沼泽栖息地的 632 只美洲淡水鱚（Ctenogobius shufeldti）的摄食生态进行了评估。分析了一组非生物因素（沉积物类型、盐度、温度和河口区域）、季节和体型对饮食组成的影响。评估了摄食策略、摄食强度和营养级随季节和体型变化的情况。还分析了口裂和体型对猎物大小利用的影响。结果表明，美洲淡水鱚是一种典型的杂食性、广适性底层掠食者，在整个季节和体型范围内均表现出这种特性，以 56 种食物为食；糠虾、绿藻、介形类、腹足类、碎屑和底栖硅藻构成了其大部分食物来源。在数量和体积上，糠虾 Kalliapseudes schubarti 均为主要的猎物。整个季节胃饱满度均保持在较高水平。与典型的广适性、机会主义杂食性摄食者一致：（1）非生物因素的季节性和时空变化对饮食结构有显著影响，（2）季节是饮食变化的主要原因，（3）饮食组成和猎物大小在体型范围内没有变化。
