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Mercury exposure driven by geographic and trophic factors in Magellanic penguins from Tierra del Fuego
Marine Pollution Bulletin ( IF 5.8 ) Pub Date : 2021-11-29 , DOI: 10.1016/j.marpolbul.2021.113184
Samanta Dodino 1 , Luciana Riccialdelli 1 , Michael J Polito 2 , Klemens Pütz 3 , Rebecka L Brasso 4 , Andrea Raya Rey 5
Affiliation  

Penguins accumulate mercury due to their long-life span together with their high trophic position. We sampled adult and juveniles' feathers from three colonies of Spheniscus magellanicus from Tierra del Fuego along an inshore-offshore corridor. We integrated toxicological information (mercury concentrations) and foraging biomarkers (δ13C, δ15N) into a common data analysis framework (isotopic niche analysis) to evaluate the influence of age, location, and foraging behaviors on mercury concentrations. Adults had higher feather mercury concentrations, δ13C, and δ15N values compared to juveniles. Also, adult and juvenile feather mercury concentrations differed between colonies, with lower mercury concentrations at the nearest inshore colony relative to the farther offshore colonies. Trophic position and the isotopic niche analyses suggest that this geographic gradient in mercury concentrations is due to differences in colonies' foraging areas. Understanding penguins' exposure to mercury derived from local food webs is a crucial first step in evaluating the impacts of this heavy metal on their conservation status.



中文翻译:

由火地岛麦哲伦企鹅的地理和营养因素驱动的汞暴露

企鹅由于它们的长寿命和高营养位置而积累汞。我们从火地岛沿近海-近海走廊的三个Spheniscus magellanicus群落中采集了成年和幼鸟的羽毛。我们将毒理学信息(汞浓度)和觅食生物标志物(δ 13 C、δ 15 N)整合到一个通用数据分析框架(同位素生态位分析)中,以评估年龄、位置和觅食行为对汞浓度的影响。成年人的羽毛汞浓度较高,δ 13 C 和 δ 15与青少年相比的 N 值。此外,成虫和幼鸟羽毛汞浓度在殖民地之间存在差异,最近的近岸殖民地的汞浓度低于较远的近海殖民地。营养位置和同位素生态位分析表明,汞浓度的这种地理梯度是由于殖民地觅食区的差异。了解企鹅接触来自当地食物网的汞是评估这种重金属对其保护状况影响的关键第一步。

更新日期:2021-11-29
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