| differences in the sterol composition of dominant antarctic zooplankton. | the composition of free sterols was determined in antarctic zooplankton species with various feeding behaviors. in the southern ocean, the dominant calanoid copepods calanoides acutus, calanus propinquus, metridia gerlachei, and euchaeta antarctica were investigated during different seasons and compared with the euphausiids euphausia superba, e. crystallorophias, and thysanoessa macrura. in addition, the arctic copepods calanus hyperboreus, c. glacialis, and c. finmarchicus were studied for comp ... | 1999 | 10188596 |
| examination of the bioaccumulation of halogenated dimethyl bipyrroles in an arctic marine food web using stable nitrogen isotope analysis. | concentrations of four possibly naturally produced organohalogens--1,1'-dimethyl-3,3',4-tribromo-4,5,5'-trichloro-2,2'-bipyrrole (dbp-br3cl3), 1,1'-dimethyl-3,3',4,4'-tetrabromo-5,5'-dichloro-2,2'-bipyrrole (dbp-br4cl2), 1,1'-dimethyl-3,3',4,4',5-pentabromo-5'-chloro-2,2'-bipyrrole (dbp-br5cl) and 1,1'-dimethyl-3,3',4,4',5,5'-hexabromo-2,2'-bipyrrole (dbp-br6)--were quantitated and the extent of their magnification through an entire arctic marine food web [measured as integrated trophic magnific ... | 2002 | 11808557 |
| enantiomer fractions of organic chlorinated pesticides in arctic marine ice fauna, zooplankton, and benthos. | stereoisomers of chiral chlorinated pesticides (alpha-hch (hch = hexachlorocyclohexane), trans- and cis-chlordane, mc5, o,p'-ddt) were quantified in arctic marine invertebrates (ice-associated amphipods gammarus wilkitzkii, pelagic copepods calanus hyperboreus, krill thysanoessa inermis, and amphipods themisto libellula, and benthic amphipods paramphithoe hystrix). enantiomer fractions (efs) were calculated to investigate the influence of habitat, geographic area, and diet on selective bioaccumu ... | 2005 | 15952350 |
| biogeographic provinces of total and methyl mercury in zooplankton and fish from the beaufort and chukchi seas: results from the sheba drift. | samples of copepods (calanus hyperboreus) and arctic cod (boreogadus saida) were collected along the sheba (surface heat budget of the arctic) drift track, which commenced in the canada basin (october 1997) and finished in the mendeleev basin (october 1998). here, we report total mercury (hgt) and ch3hg concentrations in these biological samples and examine concentration variability along the drift track in the context of trophic variation, inputs from land, spring mercury depletion events (mdes ... | 2005 | 16053067 |
| trophodynamics of some pfcs and bfrs in a western canadian arctic marine food web. | the trophodynamics of per- and polyfluorinated compounds and bromine-based flame retardants were examined in components of a marine food web from the western canadian arctic. the animals studied and their relative trophic status in the food web, established using stable isotopes of nitrogen (delta15n), were beluga (delphinapterus leucas) > ringed seal (phoca hispida) > arctic cod (boreogadus saida) > pacific herring (clupea pallasi) approximately equal to arctic cisco (coregonus autumnalis) > pe ... | 2009 | 19569333 |
| mercury bioaccumulation and biomagnification in a small arctic polynya ecosystem. | recurring polynyas are important areas of biological productivity and feeding grounds for seabirds and mammals in the arctic marine environment. in this study, we examined food web structure (using carbon and nitrogen isotopes, δ(13)c and δ(15)n) and mercury (hg) bioaccumulation and biomagnification in a small recurring polynya ecosystem near nasaruvaalik island (nunavut, canada). methyl hg (mehg) concentrations increased by more than 50-fold from copepods (calanus hyperboreus) to arctic terns ( ... | 2015 | 25149682 |