Diel feeding, daily food consumption and the predatory impact of whitemouth croaker (Micropogonias furnieri) in an estuarine environment
Diel feeding, daily food consumption and the predatory impact of whitemouth croaker (Micropogonias furnieri) in an estuarine environment
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河口环境中白口鱼 (Micropogonias Furnieri) 的昼夜摄食、每日食物消耗和捕食影响
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Vieira
中科院分区：
文献类型：
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作者：
G. Figueiredo;J. Vieira
研究人员对白口鱼（Micropogonias Furnieri）的昼夜摄食模式和食物消耗进行了检查，并将其与河口环境的季节变化联系起来。为了确定昼夜摄食模式，我们在 24 小时（约 3 小时的间隔）内从帕托斯泻湖河口收集了白口鱼，并检查了它们的胃内容物。白口鱼的食物消耗量是根据实验和现场估计的疏散率来确定的。结果表明，帕托斯泻湖河口的白口鱼全天都在进食。然而，当水体透明度增加时，白口鱼在白天表现出比其他水体透明度低时更高的摄食强度和食物消耗。因此，当白口鱼看到猎物时，它们似乎会加强捕食。每日食物消耗量占湿重的 0.9% 至 5.3%（分别是冬季和夏季的最低和最高消耗率）。白口鱼对其优先猎物 Tanaid Kalliapseudes schubatii 的最大捕食影响为 27indiv·m−2·day−1。结果表明，水体透明度的变化似乎会影响白口鱼的昼夜摄食模式和食物消耗。这可能对鱼类生长产生重要影响。
Diel feeding pattern and food consumption of whitemouth croaker (Micropogonias furnieri) were examined and related to seasonal variations in an estuarine environment. To determine diel feeding pattern whitemouth croaker were collected from the Patos Lagoon Estuary over 24 h (∼3-h intervals) and their stomach contents were examined. Food consumption of whitemouth croaker was determined from evacuation rates estimated experimentally and in the field. The results suggested that whitemouth croaker in the Patos Lagoon estuary feed all day long. However, whitemouth croaker showed higher feeding intensity and food consumption during daylight hours when the water transparency increased than in others when water transparency was low. Thus, whitemouth croaker seemed to intensify their feeding when they could see their prey. Daily food consumption was between 0.9 and 5.3% of body wet weight (these being the lowest and highest consumption rates during the winter and summer, respectively). The maximum predation impact of whitemouth croaker on their preferential prey, the tanaid Kalliapseudes schubartii, was 27indiv·m−2·day−1. The results suggested that the changes in water transparency seem to affect the diel feeding pattern and food consumption of whitemouth croaker. This could have important consequences for fish growth.