Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption of Atlantic menhaden (Brevoortia tyrannus)
Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption of Atlantic menhaden (Brevoortia tyrannus)
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北卡罗来纳州大西洋蓝鳍金枪鱼 (Thunnus thynnus) 的摄食生态：饮食、每日配给量和大西洋鲱鱼 (Brevoortia tyrannus) 的消耗量
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
J. Buckel
中科院分区：
文献类型：
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作者：
C. M. Butler;P. Rudershausen;J. Buckel
在北卡罗来纳州外的大陆架沃茨，对蓝鳍金枪鱼的饮食、胃排空率、每日口粮和种群水平的猎物需求进行了估计。在秋末和冬季的几个月里，
2003-04、2004-05和2005-06。平均肠道充盈值的昼夜模式用于估计胃排空率。每日口粮确定的平均肠道充满值和胃排空率，沿着与蓝鳍金枪鱼的人口规模和居住时间，估计人口水平的消费蓝鳍金枪鱼大西洋鲱鱼（Brevoortia brachaden）。蓝鳍金枪鱼饮食（n= 448）以大西洋鲱鱼为主;其他硬骨鱼，
螃蟹和鱿鱼大多是次要的。在肠道充盈峰值后排空胃所需的时间估计为约20小时。每日口粮估计值约为每天体重的2%。在目前的西大西洋种群水平上，与其他已知捕食者的捕食和商业捕捞的数量相比，蓝鳍金枪鱼对大西洋鲱鱼的捕食是最少的。冬季，蓝鳍金枪鱼似乎占据了北卡罗来纳州的沿海沃茨，捕食大西洋鲱鱼。因此大西洋鲱鱼的变化
种群状况或分布会改变蓝鳍金枪鱼冬季觅食的地点
Diet, gastric evacuation rates, daily ration, and population-level prey demand of bluefin tuna (Thunnus thynnus) were estimated in the continental shelf waters off North Carolina. Bluefin tuna stomachs were collected from commercial fishermen during the late fall and winter months
of 2003–04, 2004–05, and 2005–06. Diel patterns in mean gut fullness values were used to estimate gastric evacuation rates. Daily ration determined from mean gut fullness values and gastric evacuation rates was used, along with bluefin tuna population size and residency times, to estimate population-level consumption by bluefin tuna on Atlantic menhaden (Brevoortia tyrannus). Bluefin tuna diet (n= 448) was dominated by Atlantic menhaden; other teleosts,
portunid crabs, and squid were of mostly minor importance. The time required to empty the stomach after peak gut fullness was estimated to be ~20 hours. Daily ration estimates were approximately 2% of body weight per day. At current western Atlantic population levels, bluefin tuna predation on Atlantic menhaden is minimal compared to predation by other known predators and the numbers taken in commercial harvest. Bluefin tuna appear to occupy coastal waters in North Carolina during winter to prey upon Atlantic menhaden. Thus, changes in the Atlantic menhaden
stock status or distribution would alter the winter foraging locations of bluefin