Influence of trophic position and foraging range on mercury levels within a seabird community

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Influence of trophic position and foraging range on mercury levels within a seabird community

Seabirds are often advocated as biomonitors for marine contaminants such as mercury (Hg). However, contaminant levels can vary widely depending on among-individual and amongspecies variation in foraging preferences and physiology, and on tissue types used for analyses. Using stable isotope analysis (SIA), we investigated the effects of trophic position, season, and tissue type on Hg burdens in ...

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Feather mercury levels in seabirds at South Georgia: influence of trophic position, sex and age

We studied the mercury contamination of 13 species of seabirds breeding on Bird Island, South Georgia, in 1998. Total mercury concentrations in body feather samples of birds caught at their breeding colonies were determined. Among the species, grey-headed albatross (8933 ng g–1) and southern giant petrel (7774 ng g–1) showed the highest, and gentoo penguin (948 ng g–1) the lowest body feather m...

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Mercury Biomagnification between Two Trophic Levels of a Grazing Food Chain (Plankton and Planktivorous Fish) in a Fresh Water Ecosystem

Background: The Present study was carried out to track and calculate Biomagnification Factor (BMF) of total mercury (T-Hg) between two different trophic levels (i.e., plankton and a planktivorous fish) in a fresh water grazing food chain. Methods: Experimental organisms were planktonic biomass and silver carp (Hypophthalmichthys molitrix) as a planktivorous fish. Silver carp samples were obt...

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Influence of density‐dependent competition on foraging and migratory behavior of a subtropical colonial seabird

Density-dependent competition for food resources influences both foraging ecology and reproduction in a variety of animals. The relationship between colony size, local prey depletion, and reproductive output in colonial central-place foragers has been extensively studied in seabirds; however, most studies have focused on effects of intraspecific competition during the breeding season, while lit...

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ژورنال

عنوان ژورنال: Marine Ecology Progress Series

سال: 2009

ISSN: 0171-8630,1616-1599

DOI: 10.3354/meps07784