Size, Sex And Geographic Variation in the Diet of the Tiger Shark, Galeocerdo Cuvier, From Western Australian Waters
Size, Sex And Geographic Variation in the Diet of the Tiger Shark, Galeocerdo Cuvier, From Western Australian Waters
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来自西澳大利亚水域的虎鲨（Galeocerdo Cuvier）的大小、性别和饮食的地理变化
DOI：
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发表时间：
2001
影响因子：
1.4
通讯作者：
R. McAuley
中科院分区：
文献类型：
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作者：
C. Simpfendorfer;A. Goodreid;R. McAuley
对在西澳大利亚中部海岸外的钓线上捕获的虎鲨Galeocerdo cuvier的胃内容物进行了分析，以调查由于性别，大小和地理位置而导致的饮食变化。84个样本的胃中含有食物，26个样本的胃是空的，66个样本的胃已经腐烂。已查明有12个猎物群体，最常见的是海龟、海蛇、硬骨鱼、儒艮和海鸟。男性和女性之间的饮食重叠很高。在饮食中观察到个体发育转变。较小的猎物（如头足类、硬骨鱼和海蛇）在小个体中更为常见，而较大的猎物（如海龟、儒艮和板鳃类）则随着鲨鱼体型的增大而增加。饮食的差异，观察四个地区之间沿着西澳大利亚州中部海岸。捕获和消耗大型猎物的能力，猎物的可用性，猎物密度和猎物的盈利能力被确定为影响饮食的因素。儒艮和鳖类在中华绒螯蟹食物中的高含量。居维叶相对于它们的丰度，表明鲨鱼捕食可能在调节这些物种的数量方面发挥重要作用。
Stomach contents from tiger sharks, Galeocerdo cuvier, caught on lines off the central coast of Western Australia were analysed to investigate variations in the diet due to sex, size and geographic location. Stomachs from 84 specimens contained food, while 26 had empty stomachs and 66 had regurgitated. Twelve prey groups were identified, the most common being turtles, sea snakes, teleost fishes, dugongs and sea birds. Dietary overlap was high between males and females. An ontogenetic shift was observed in the diet. Smaller prey (e.g. cephalopods, teleosts and sea snakes) were more common in small individuals, while the occurrence of larger prey (e.g. turtles, dugongs and elasmobranchs) increased with increasing shark size. Differences in the diet were observed between four regions along the central Western Australian coast. The ability to catch and consume large prey, prey availability, prey density, and prey profitability were identified as factors influencing the diet. The high level of occurrence of dugongs and turtles in the diet of G. cuvier, relative to their abundance, suggests that shark predation may play an important role in regulating populations of these species.