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首页> 外文期刊>Journal of Avian Biology >Foraging behaviour and fuel accumulation of capital breeders during spring migration as derived from a combination of satellite- and ground-based observations
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Foraging behaviour and fuel accumulation of capital breeders during spring migration as derived from a combination of satellite- and ground-based observations

机译：卫星迁徙和地面观测结合得出的春季迁徙期间首都育种者的觅食行为和燃料积累

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The migration strategy of many capital breeders is to garner body stores along the flyway at distinct stopover sites. The rate at which they can fuel is likely to be strongly influenced by a range of factors, such as physiology, food availability, time available for foraging and perceived predation. We analysed the foraging behaviour and fuel accumulation of pink-footed geese, an Arctic capital breeder, at their mid-flyway spring stopover site and evaluated to what extent their behaviour and fuelling were related to physiological and external factors and how it differed from other stopovers along the flyway. We found that fuel accumulation rates of geese at the mid-flyway site were limited by habitat availability rather than by digestive constraints. However, as the time available for foraging increased over the stopover season, geese were able to keep constant fuelling rate. Putting this in perspective, geese increased their daily net energy intake along the flyway corresponding to the increase in time available for foraging. The net energy intake per hour of foraging remained the same. Geese showed differences in their reaction to predators/disturbance between the sites, taking higher risks particularly at the final stopover site. Hence, perceived predation along the flyway may force birds to postpone the final fuel accumulation to the last stopover along the flyway. Flexibility in behaviour appears to be an important trait to ensure fitness in this capital breeder. Our findings are based on a new, improved method for estimating fuel accumulation of animals foraging in heterogeneous landscapes based on data obtained from satellite telemetry and habitat specific intake rates.
机译：许多资本育种者的迁移策略是在不同的中途停留地点沿飞路收集车身。它们的燃料添加速度可能会受到一系列因素的强烈影响，例如生理，食物供应，可觅食时间和感知的捕食。我们分析了北极资本繁殖者粉红脚雁在春季中途停留地点的觅食行为和燃料积累，并评估了其行为和燃料在多大程度上与生理和外部因素有关，以及与其他中途停留有何不同沿着飞路。我们发现，中途飞行地点鹅的燃料积累率受到栖息地可用性的限制，而不是受到消化系统的限制。但是，随着中途停留时间的可觅食时间增加，鹅能够保持恒定的加油率。从这个角度来看，大雁增加了沿飞道的每日净能量摄入量，这与觅食时间的增加相对应。每小时觅食的净能量摄入量保持不变。鹅对站点之间的天敌/干扰反应表现出差异，尤其在最后的中途停留站点，风险更高。因此，沿航道的感知捕食可能会迫使鸟类将最终的燃料积累推迟到沿航道的最后中途停留。行为的灵活性似乎是确保适合该资本繁殖者的重要特征。我们的发现基于一种新的改进方法，该方法基于从卫星遥测和栖息地特定摄入率获得的数据来估计在异质景观中觅食的动物的燃料积累。

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