Dietary partitioning by five sympatric species of stingray (Dasyatidae) on coral reefs.
Dietary partitioning by five sympatric species of stingray (Dasyatidae) on coral reefs.
复制标题
珊瑚礁上五种同域黄貂鱼（Dasyatidae）的饮食分配。
作者：
O. O’Shea;M. Thums;M. van Keulen;R. Kempster;M. Meekan
食物的特点和程度的同域黄貂鱼的饮食分区内的珊瑚礁泻湖宁格鲁礁，西澳大利亚州（牛尾Pastinachus atrus，蓝点扇尾Taeniura eradema，蓝点面具Neotrygon kuhlii，豪猪Urogymnus asperrimus射线和网状whipray Himantura uarnak）的胃内容物和沉积物分析进行了评估。从170条鳐鱼和3215个个体的胃中回收了2804个项目，用于选择性分析。24个猎物类群被确定为10个分类类别的胃内容物进行分析，其中环节动物，对虾，brachyurans和双壳类是最丰富的，共占96%的饮食。Himantura uarnak在饮食方面具有最大的种间差异，消耗了更大比例的甲壳类动物，特别是penaeids（占总饮食的41%），而其他四种射线，所有这些都以环节动物为主（占总饮食的71-82%）。甲壳动物的特化由H. uarnak的存在可能是为了最大限度地利用资源，减少同域物种之间的竞争。其余的物种可能会根据空间而不是饮食来分配资源。
Dietary characteristics and the degree of dietary partitioning by five species of sympatric stingray were assessed using stomach content and sediment analyses within a coral reef lagoon at Ningaloo Reef, Western Australia (the cowtail Pastinachus atrus, blue-spotted fantail Taeniura lymma, blue-spotted mask Neotrygon kuhlii, porcupine Urogymnus asperrimus rays and the reticulate whipray Himantura uarnak). A total of 2804 items were recovered from the stomachs of 170 rays and 3215 individual taxa from the environment, which were used in selectivity analyses. Twenty-four prey taxa were identified from stomach contents and pooled into 10 taxonomic categories for analysis, of which annelids, prawns, brachyurans and bivalves were the most abundant, together accounting for 96% of the diet. Himantura uarnak had the greatest interspecific dissimilarity in diet, consuming a larger proportion of crustaceans, notably penaeids (41% of total diet) than the other four species of rays, all of which had diets dominated by annelids (71-82% of total diet). Crustacean specialization by H. uarnak may exist to maximize resources and reduce competition among sympatric species. The remaining species may partition resources on the basis of space, rather than diet.