路易斯安那州巴拉塔里亚湾深水地平线石油泄漏后,越冬普通潜鸟(加维亚潜水器)的营养位置

Pub Date : 2022-11-11 DOI:10.1675/063.045.0104
S. Wainright, L. Vlietstra, Hannah R. Uher-Koch, J. Paruk
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引用次数: 1

摘要

摘要在2010年深水地平线漏油事件发生后的2011-2014年,在路易斯安那州海岸Barataria湾水域越冬的普通潜鸟(Gavia immer)进行了采样。分析了血液样本中碳、氮和硫的稳定同位素比率,作为栖息地利用和饮食的代表,以扩大我们对越冬潜鸟营养地位的理解。δ 13C和δ 34S值表明,这些普通潜蝇在沿海河口生境中取食。通过比较2014年同时采样的褐鹈鹕(Pelecanus occidentalis)和潜鸟的稳定同位素比率,间接估计了其营养位置。两种的同位素特征差异不显著;这与假设一致,即这两个物种主要在沿海河口栖息地觅食,主要是鱼食动物。亚成虫和成虫在同位素特征上没有显著差异,说明它们的栖息地和饮食习惯相似。成虫比亚成虫体重更重,身体状况更好。稳定同位素组成与体况无显著相关。通过对同一潜水者血液中多环芳烃(PAH,一种指示物或油污染)的平行数据集分析,PAH污染与稳定同位素组成之间没有显著关系。因此,多环芳烃污染不可能与特定的觅食栖息地或饮食有关。
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Trophic Position of Wintering Common Loons (Gavia immer ) in Barataria Bay, Louisiana Following the Deepwater Horizon Oil Spill
Abstract. Common Loons (Gavia immer) wintering in watercourses of Barataria Bay, in coastal Louisiana were sampled in 2011–2014 following the Deepwater Horizon oil spill of 2010. Blood samples were analyzed for stable isotope ratios of carbon, nitrogen and sulfur as proxies for habitat use and diet in order to expand our understanding of the trophic position of wintering loons. The δ 13C and δ 34S values indicated that these Common Loons feed in coastal estuarine habitats. Trophic position was estimated indirectly by comparing loon stable isotope ratios with those of Brown Pelicans (Pelecanus occidentalis), a known piscivore, sampled concurrently in 2014. The isotopic signatures of the two species were not significantly different; this is consistent with the hypothesis that both species foraged primarily in coastal estuarine habitats and mainly as piscivores. No significant differences were found between subadult and adult Common Loons with respect to isotopic signatures, suggesting similar habitat usage and diet. Adults weighed more and were in better body condition than subadults. Stable isotope composition and body condition were not significantly related. Using a parallel data set of polycyclic aromatic hydrocarbons (PAH, an indicator or oil contamination) in the blood of the same loons, there was no significant relationship between PAH contamination and stable isotopic composition. Therefore, PAH-contamination could not be linked to a distinctive foraging habitat or diet.
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