Foraging Strategies of Laysan Albatross Inferred from Stable Isotopes: Implications for Association with Fisheries.
Foraging Strategies of Laysan Albatross Inferred from Stable Isotopes: Implications for Association with Fisheries.
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DOI：
10.1371/journal.pone.0133471
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Romano MD
中科院分区：
文献类型：
--
作者：
Edwards AE;Fitzgerald SM;Parrish JK;Klavitter JL;Romano MD
致命的渔具缠绕是全球信天翁数量下降的主要原因，这是商业捕鱼作业的诱饵和渔业丢弃物的吸引力的结果。我们调查了觅食策略的Laysan信天翁（Phoebastria immutabilis），推断初级羽毛的氮和碳同位素值，以确定繁殖相关的，季节性的，和历史因素，可能会影响与阿拉斯加或夏威夷延绳钓渔业的可能性。羽毛样本收集自夏威夷西北部中途岛环礁上监测繁殖状况和繁殖成功的活鸟，作为副渔获物打捞的鸟，以及1924年前加入博物馆收藏的鸟。在鸡饲养季节（采样4月至5月），稳定同位素值的最高，最一致的繁殖成功的鸟类的平均值和方差是不同的生产力较低的同种和完全不同的夏威夷或阿拉斯加延绳钓渔业捕获的鸟类，这表明鸟类具有较高的多年繁殖成功不太可能与这些渔业。当代鸟类的繁殖成功率最高的平均值最相似的历史鸟类。价值观的殖民地绑定，求爱的前繁殖者是类似于积极的繁殖者，但不同的前繁殖者在阿拉斯加延绳钓渔业。在繁殖季节，现代和历史鸟类的δ 15 N值变化很大。虽然一些历史鸟类的δ 15 N值极低，与当代鸟类（< 11.2‰）无法比拟，但其他鸟类的δ 15 N值与最高的渔业相关当代鸟类一样高。在非繁殖季节（采样7月至9月），同位素变异合并成一个更窄的一组值为当代和历史的鸟类。我们的研究结果表明，觅食策略的Laysan信天翁是一个复杂的功能的季节，繁殖状态，和多年的繁殖成功，可能影响的概率与渔业的因素。
Fatal entanglement in fishing gear is the leading cause of population decline for albatross globally, a consequence of attraction to bait and fishery discards of commercial fishing operations. We investigated foraging strategies of Laysan albatross (Phoebastria immutabilis), as inferred from nitrogen and carbon isotope values of primary feathers, to determine breeding-related, seasonal, and historic factors that may affect the likelihood of association with Alaskan or Hawaiian longline fisheries. Feather samples were collected from live birds monitored for breeding status and breeding success on Midway Atoll in the northwestern Hawaiian Islands, birds salvaged as fisheries-bycatch, and birds added to museum collections before 1924. During the chick-rearing season (sampled April-May), means and variances of stable isotope values of birds with the highest, most consistent reproductive success were distinct from less productive conspecifics and completely different from birds caught in Hawaiian or Alaskan longline fisheries, suggesting birds with higher multi-annual reproductive success were less likely to associate with these fisheries. Contemporary birds with the highest reproductive success had mean values most similar to historic birds. Values of colony-bound, courting prebreeders were similar to active breeders but distinct from prebreeders caught in Alaskan longline fisheries. During the breeding season, δ15N values were highly variable for both contemporary and historic birds. Although some historic birds exhibited extremely low δ15N values unmatched by contemporary birds (< 11.2‰), others had values as high as the highest fishery-associated contemporary birds. During the non-breeding season (sampled July-September), isotopic variability coalesced into a more narrow set of values for both contemporary and historic birds. Our results suggest that foraging strategies of Laysan albatross are a complex function of season, breeding status, and multi-annual breeding success, factors that likely affect the probability of association with fisheries.