Variability in nitrogen-derived trophic levels of Arctic marine biota
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چکیده
منابع مشابه
Freshwater discharges drive high levels of methylmercury in Arctic marine biota.
Elevated levels of neurotoxic methylmercury in Arctic food-webs pose health risks for indigenous populations that consume large quantities of marine mammals and fish. Estuaries provide critical hunting and fishing territory for these populations, and, until recently, benthic sediment was thought to be the main methylmercury source for coastal fish. New hydroelectric developments are being propo...
متن کاملRegional variability in food availability for Arctic marine mammals.
This review provides an overview of prey preferences of seven core Arctic marine mammal species (AMM) and four non-core species on a pan-Arctic scale with regional examples. Arctic marine mammal species exploit prey resources close to the sea ice, in the water column, and at the sea floor, including lipid-rich pelagic and benthic crustaceans and pelagic and ice-associated schooling fishes such ...
متن کاملComparing measured and predicted PCB concentrations in Arctic seawater and marine biota.
When a mechanistic food web model was parameterized for the Arctic marine ecosystem, it predicted PCB concentrations in zooplankton and fish that were two orders of magnitude lower than measured. PCB concentrations measured in zooplankton and fish were within the laboratory's accredited quality assured criteria, and were comparable to other Arctic regions. Although on a different scale, the pre...
متن کاملApplying Trophic Tracers to Study Contaminant Levels and Trends in Arctic Marine Wildlife and Food Webs: A Review
Arctic biota are exposed to a complex suite of anthropogenicallysourced contaminants including mercury (Hg) and persistent organic pollutants (POPs). Levels of these contaminants are determined by source emissions and pathways as well biological and ecological factors. As the use of chemical tracers in trophic ecology matures and gains recognition, these tracers have increasingly been applied t...
متن کاملDiet composition and trophic levels of marine mammals
Standardized diet compositions were derived for 97 species of marine mammals from published accounts of stomach contents as well as from morphological, behavioural and other information. Diet was apportioned among eight categories of prey types (benthic invertebrates, large zooplankton, small squids, large squids, small pelagic fishes, mesopelagic fishes, miscellaneous fishes and higher inverte...
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ژورنال
عنوان ژورنال: Polar Biology
سال: 2020
ISSN: 0722-4060,1432-2056
DOI: 10.1007/s00300-020-02782-4