Activity and diving metabolism correlate in Steller sea lion Eumetopias jubatus
Activity and diving metabolism correlate in Steller sea lion Eumetopias jubatus
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DOI：
10.3354/ab00039
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发表时间：
2008-01-01
期刊：
影响因子：
1.4
通讯作者：
Trites, Andrew W.
中科院分区：
文献类型：
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作者：
Fahlman, Andreas;Wilson, Rory;Trites, Andrew W.
三只虎头海狮Eumetopias jubatus被训练参加自由游泳，开放的海洋实验，旨在确定活动是否可以用来估计在深海寻找猎物的能量消耗。海狮被训练潜入10到50米的固定深度，并在一个漂浮的圆顶内重新浮出水面，通过气体交换来测量能量消耗。在觅食过程中，海狮身上安装了一个3轴加速度计。加速度数据用于确定总体动态身体加速度（ODBA），这是活动的代理。结果表明，ODBA与潜水代谢率（潜水+水面间隔）具有良好的相关性，且关系的变异性（r(2) = 0.47，将海狮作为随机因素进行线性回归）与其他研究中使用心率估算海狮在2 m深水通道中水下游泳的代谢率的结果相似。多变量分析表明，ODBA和潜水时间对预测潜水代谢成本都很重要，但ODBA单独预测动物之间的觅食成本在7%以内。因此，收集三维加速度数据是估计野生虎头海狮和其他潜水哺乳动物和鸟类野外代谢率的简单技术。
Three Steller sea lions Eumetopias jubatus were trained to participate in free-swimming, open-ocean experiments designed to determine if activity can be used to estimate the energetic cost of finding prey at depth. Sea lions were trained to dive to fixed depths of 10 to 50 m, and to re-surface inside a floating dome to measure energy expenditure via gas exchange. A 3-axis accelerometer was attached to the sea lions during foraging. Acceleration data were used to determine the overall dynamic body acceleration (ODBA), a proxy for activity. Results showed that ODBA correlated well with the diving metabolic rate (dive + surface interval) and that the variability in the relationship (r(2) = 0.47, linear regression including Sea lion as a random factor) was similar to that reported for other studies that used heart rate to estimate metabolic rate for sea lions swimming underwater in a 2 m deep water channel. A multivariate analysis suggested that both ODBA and dive duration were important for predicting diving metabolic cost, but ODBA alone predicted foraging cost to within 7% between animals. Consequently, collecting 3-dimensional acceleration data is a simple technique to estimate field metabolic rate of wild Steller sea lions and other diving mammals and birds.