Analysis of stomach contents of freshwater stingrays (Elasmobranchii, Potamotrygonidae) from the middle Negro River, Amazonas, Brazil
Analysis of stomach contents of freshwater stingrays (Elasmobranchii, Potamotrygonidae) from the middle Negro River, Amazonas, Brazil
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巴西亚马逊内格罗河中游淡水黄貂鱼（Elasmobranchii，Potamotrygonidae）胃内容物分析
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发表时间：
2009
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通讯作者：
J. Zuanon
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作者：
Akemi Shibuya;M. L. G. Araújo;J. Zuanon
溪蟹属黄貂鱼仅限于新热带河流，有关其饮食的信息仍然很少。因此，猎物组成的四种淡水黄貂鱼从中间的内格罗河进行了研究，胃内容物分析：Potamotrygonmotoro（n = 40），Potamotrygonorbignyi（n = 27），Potamotrygonsp。"cururu"（n = 26），和Paratrygonaiereba（n = 34）。猎物项目被确定到最低的分类水平可能和分析的相对重要性指数（%IRI）。硬骨鱼类、甲壳类和昆虫幼虫被所有物种以不同的比例食用。溪蟹主要以长臂虾（33.8%）和蟹类（48.7%）为食。奥氏溪蟹胃内容物主要由昆虫组成（96.4%），其中以斑节蜱幼虫为主。以甲壳类（虾蟹类：49.4%）和昆虫幼虫（30.2%）为食。副海龙主要摄食硬骨鱼类（94.8%），种类繁多。这些结果表明，四个淡水黄貂鱼物种之间的食物分区，根据不同的微生境和觅食基板的使用。不同的猎物检测和捕获机制也可能有助于这些黄貂鱼物种的胃内容物的猎物组成的差异。
Potamotrygonid stingrays are restricted to Neotropical rivers and information on their diet remains scarce. Thus, the prey composition of four freshwater stingray species from the middle Negro River was studied using stomach contents analysis: Potamotrygon motoro (n=40), Potamotrygon orbignyi (n=27), Potamotrygon sp. "cururu" (n=26), and Paratrygon aiereba (n=34). Prey items were identified up to the lowest taxonomic level possible and analyzed with the Index of Relative Importance (%IRI). Teleosteans, crustaceans and insect larvae were consumed by all species in distinct proportions. Potamotrygon motoro fed mainly on palaemonid shrimps (33.8%) and trichodactylid crabs (48.7%). Stomach contents of Potamotrygon orbignyi were composed principally by insects (96.4%), with predominance of gomphid dragonfly larvae. Potamotrygon sp. "cururu" fed on crustaceans (shrimps and crabs: 49.4%) and insect larvae (30.2%). Paratrygon aiereba consumed mainly teleosteans (94.8%), which were composed by a wide variety of species. These results suggest a food partitioning among the four freshwater stingray species, based on the use of different microhabitats and foraging substrates. Different mechanisms of prey detection and capture may also contribute to the differences of prey composition in the stomach contents of these stingray species.