Foraging intensity of wild mulloway Argyrosomus japonicus decreases with increasing anthropogenic disturbance
Foraging intensity of wild mulloway Argyrosomus japonicus decreases with increasing anthropogenic disturbance
复制标题
野生银鲫觅食强度随着人为干扰的增加而降低
DOI：
10.1007/s00227-014-2603-7
复制
发表时间：
2015
期刊：
影响因子：
2.4
通讯作者：
C.A. Gray & M.D. Taylor
中科院分区：
文献类型：
--
作者：
Payne;N.L.;D.E. van der Meulen;I.M. Suthers;C.A. Gray & M.D. Taylor
对于陆地系统来说，人为干扰对野生动物行为的影响日益得到认识。关于自由放养水生动物的数据相对较少，这代表了估计人类干扰对生物体适应性以及水生系统功能的影响的问题。我们使用植入野生鱼类和档案胃内容物数据中的声学加速计和深度发射器来测试划船强度与河口掠食性鱼类（马洛韦Argyrosomus japonicus）的活动水平和觅食效率之间的关系。划船活动的增加（从水下噪声和当地海事记录的为期一周的趋势推断）与马洛韦活动水平的减少和深度分布的增加有关。来自附近河口的胃内容物数据显示，与工作日相比，该物种在周末（划船活动最多时）的摄食率要低得多，并且饮食结构也发生了变化，并且推断的觅食成功率几乎是工作日的三分之一。这些数据表明穆洛韦的行为和觅食强度受到人为干扰的显着影响。觅食成功率降低的总体适应性成本将取决于穆洛韦将觅食重新分配到干扰较少的条件的容易程度，以及该物种对干扰的应激相关反应的程度。这项研究支持了早期的预测，即噪音等人为干扰可能对水生动物的行为和健康产生重大影响。
The influence of anthropogenic disturbance on the behaviour of wild animals is increasingly recognised for terrestrial systems. Data on free-ranging aquatic animals are comparatively scarce, and this represents a problem for estimating the consequences of human disturbance for organism fitness and therefore the functioning of aquatic systems. We used acoustic accelerometer and depth transmitters implanted in wild fish and archival stomach content data to test for relationships between the intensity of boating and the activity levels and foraging efficiency of an estuarine predatory fish, the mullowayArgyrosomus japonicus.Increasing boating activity (inferred from week-long trends in underwater noise and local maritime records) was associated with a reduction in activity levels and increased depth distributions of mulloway. Stomach content data from a nearby estuary revealed a far-lower feeding rate and altered diet composition on weekends (when boating activity is greatest) compared to weekdays for this species, and an inferred foraging success rate almost one-third that of weekdays. These data suggest the behaviour and foraging intensity of mulloway is significantly influenced by anthropogenic disturbance. The overall fitness costs of the reduction in foraging success will depend on how readily mulloway can reallocate foraging to less disturbed conditions, and the extent of stress-related responses to disturbance in this species. This study supports earlier predictions that anthropogenic disturbances like noise could have significant impacts on the behaviour and fitness of aquatic animals.