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首页> 外文期刊>Anais da Academia Brasileira de Ciencias >Diet and niche breadth and overlap in fish communities within the area affected by an Amazonian reservoir (Amapá, Brazil)
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Diet and niche breadth and overlap in fish communities within the area affected by an Amazonian reservoir (Amapá, Brazil)

机译：受亚马逊水库影响的地区（巴西阿马帕）内鱼类群落的饮食和生态位宽度以及重叠

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We investigated the niche breadth and overlap of the fish species occurring in four environments affected by the Coaracy Nunes reservoir, in the Amapá Brazilian State. Seasonal samples of fishes were taken using a standard configuration of gillnets, as well as dragnets, lines, and cast-nets. Five hundred and forty stomach contents, representing 47 fish species were analyzed and quantified. Niche breadth and overlap were estimated using indexes of Levins and Pianka, respectively, while interspecific competition was evaluated using a null model (RA3). ANOVA and the Kruskal-Wallis test were used, respectively, to evaluate differences in niche breadth and overlap between areas. The data indicate that the majority of the fish species belong to the piscivore, omnivore, and detritivore guilds. These species have likely colonized the environments due to the availability of suitable feeding resources, and the favorable physical conditions created by the river damming. Overall, few species have ample niches, but most of them are highly specialized. Resources seasonal variation had little effect on the feeding behavior of most species in the study areas. The null models indicated that competition was not a factor determining on community structure.
机译：我们调查了在巴西阿马帕州受Coaracy Nunes水库影响的四种环境中出现的鱼类的生态位宽度和重叠情况。使用标准配置的刺网，拉网，鱼线和渔网采集季节性鱼类样品。对代表47种鱼类的540种胃内容物进行了分析和定量。利基宽度和重叠分别使用Levins和Pianka的指数进行估算，而种间竞争则使用无效模型（RA3）进行评估。分别使用ANOVA和Kruskal-Wallis检验来评估利基宽度和区域之间重叠的差异。数据表明，大多数鱼类都属于食肉动物，杂食动物和雌性动物行会。由于有合适的饲料资源以及河水筑坝带来的有利的自然条件，这些物种很可能已在环境中定居。总体而言，很少有物种有足够的生态位，但其中大多数是高度专业的。资源季节变化对研究区域大多数物种的摄食行为影响很小。零模型表明竞争不是决定社区结构的因素。

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