Habitat selection by foraging macaroni penguins correlates with hematocrit, an index of aerobic condition
Habitat selection by foraging macaroni penguins correlates with hematocrit, an index of aerobic condition
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DOI：
10.3354/meps11320
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发表时间：
2015-06-18
影响因子：
2.5
通讯作者：
Williams, Tony D.
中科院分区：
文献类型：
--
作者：
Crossin, Glenn T.;Takahashi, Akinori;Williams, Tony D.
繁殖投资在鸡饲养期间是一个重要的贡献终身健身。小鸡饲养的关键是父母觅食的成功，因为食物的交付会影响小鸡的生长和存活，直到羽翼丰满。对于海鸟来说，众所周知，包括海面温度等因素在内的海洋条件会影响觅食决策，但很少有研究探讨可能影响这些决策的生理变量。我们使用全球定位系统（GPS），时间深度记录仪（TDR），和生理采样技术，以探讨海洋温度，潜水行为，并在鸡饲养雌性通心粉企鹅Eudyptes chrysolophus觅食成功之间的联系。然后，我们探讨了这些觅食变量和个人的生理条件，特别是有氧能力（红细胞压积）和代谢状态（皮质酮）的措施之间的相关性。在GPS跟踪的企鹅中，观察到了衰老策略的2个原则：企鹅在南格鲁吉亚鸟岛繁殖地周围凉爽的近岸区域进行深潜，或者它们游得更远，在温暖的大陆架附近潜得更浅。休息区。装备TDR的企鹅也表现出类似的模式。TDR企鹅在旅行开始时的血液采样显示，红细胞压积和觅食旅行的平均持续时间，在这些旅行中经历的海洋温度，和觅食活动的相对效率方面的觅食行为记录每次潜水的数量之间存在很强的正相关性。这些结果表明，有氧能力可能是一个重要的决定因素，为老龄化的行程范围，以及工作量。皮质酮是无关的潜水行为，这与以前的研究探讨实验增加这种激素对觅食行为的影响，我们讨论了这种差异的原因。
Reproductive investment during the chick-rearing period is an important contributor to lifetime fitness. Key to chick-rearing is the success of parental foraging, as food deliveries affect chick growth and survival up until fledging. For seabirds, oceanographic conditions including factors such as sea surface temperature are known to influence foraging decisions, but few studies have examined the physiological variables that might affect those decisions. We used global positioning systems (GPS), time-depth recorders (TDR), and physiological sampling techniques to explore links between ocean temperature, diving behavior, and foraging success in chick-rearing female macaroni penguins Eudyptes chrysolophus. We then explored correlations between these foraging variables and measures of individual physiological condition, specifically aerobic capacity (hematocrit) and metabolic state (corticosterone). In GPS-tracked penguins, 2 principal for aging tactics were observed: penguins made deep dives in cool, near-shore areas surrounding the breeding colony at Bird Island, South Georgia, or they traveled farther to dive shallower in warmer shelf-break areas. TDR-equipped penguins showed similar patterns. Blood sampling of TDR penguins at the onset of trips revealed strong positive correlations between hematocrit and the mean duration of foraging trips, the ocean temperature experienced during these trips, and the relative efficiency of foraging activity in terms of the number of foraging behaviors recorded per dive. These results suggest that aerobic capacity might be an important determinant of for aging trip range, as well as workload. Corticosterone was unrelated to diving behavior, which counters previous studies examining the effects of experimental increases of this hormone on foraging behavior, and we discuss reasons for this disparity.