Can seal eating explain elevated levels of PCBs and organochlorine pesticides in walrus blubber from eastern Hudson Bay (Canada)?

Muir, Derek C.G.; Segstro, Mark D.; Hobson, Keith A.; Ford, C.A.; Stewart, Robert E.; Olpinski, S

doi:10.1016/0269-7491(95)00019-n

Cited by 96 publications

(57 citation statements)

References 38 publications

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“…Resale or republication not permitted without written consent of the publisher highly lipophilic and resistant to biodegradation, PCBs biomagnify in the fatty tissues of the marine fauna, their concentrations increasing with the trophic level (Tanabe et al 1981, Muir et al 1995, Mössner & Ballschmiter 1997, Bard 1999, Bang et al 2001. Marine mammals, like seals, are particularly exposed to contamination by PCBs because they are top predators, characterized by relatively long life spans and large deposits of fatty tissue reserves.…”

Section: Abstract: Grey Seal · Halichoerus Grypus · Pcbs · Lactationmentioning

confidence: 99%

Quantitative dynamics of PCB transfer from mother to pup during lactation in UK grey seals Halichoerus grypus

Debier¹,

Pomeroy²,

Dupont³

et al. 2003

Mar. Ecol. Prog. Ser.

136

101

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Section: Abstract: Grey Seal · Halichoerus Grypus · Pcbs · Lactationmentioning

confidence: 99%

Quantitative dynamics of PCB transfer from mother to pup during lactation in UK grey seals Halichoerus grypus

Debier¹,

Pomeroy²,

Dupont³

et al. 2003

Mar. Ecol. Prog. Ser.

136

101

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“…Hobson & Welch 1992, Ostrom et al 1993, Muir et al 1995. This method is based on the demonstration that stable isotope ratios in tissues of animals are correlated with those of their diet (Gearing et al 1984, Minagawa & Wada 1984.…”

Section: Introductionmentioning

confidence: 99%

Marine mammals and the community structure of the Estuary and Gulf of St Lawrence, Canada: evidence from stable isotope analysis

Lesage¹,

Hammill²,

Kovacs³

2001

Mar. Ecol. Prog. Ser.

163

131

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The trophic relationships of both the benthic and pelagic communities in the Estuary and Gulf of St Lawrence regions were examined, with a special focus on the trophic position (TP) and relationship(s) among harbour, grey, hooded and harp seals and beluga whales. A multiple stable isotope and multiple tissue approach, used in conjunction with conventional dietary information, suggested that marine mammals occupied the highest trophic positions in the food webs of both communities and that they overlapped with one another to some extent trophically. Harbour seals Phoca vitulina and hooded seals Cystophora cristata occupied the highest TP, grey seals Halichoerus grypus, Gulf harp seals Phoca groenlandica, and male beluga whales Delphinapterus leucas were intermediate, and Estuary harp seals and female beluga whales were at the lowest TP. A general pattern of increasing enrichment of 13 C or 15 N with age was observed in marine mammals (as well as fishes), although yearlings showed a decreased enrichment compared to both younger and older age classes. Sex also influenced δ 15 N values. Males were more 15 N-enriched than females, with the difference between the sexes increasing with age, and being most pronounced in species that are sexually dimorphic with respect to body size. Geographical location also influenced isotope abundance. Estuary organisms were generally 13 C-enriched relative to Gulf animals. δ 13 C values were on average lower in short-term diet integrators (blood serum) than in longer-term diet integrators (red blood cells) of harbour seals captured in April to June in the Estuary, which suggests that they probably did not move outside the Lower Estuary during the winter. Grey seals captured in the Lower Estuary did, however, show evidence of having been in the Gulf region some weeks or months before capture.

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“…Therefore, aquatic invertebrates are likely to play an important role in the dynamics of contaminants in aquatic food webs. Also, the level of OC exposure by upper TL organisms will depend on their choice of species as prey (Muir et al 1995).…”

Section: Abstract: Stable Isotopes · Carbon-13 · Nitrogen-15 · Zooplmentioning

confidence: 99%

Influence of habitat, trophic ecology and lipids on, and spatial trends of, organochlorine contaminants in Arctic marine invertebrates

Fisk¹,

Hoekstra²,

Gagnon³

et al. 2003

Mar. Ecol. Prog. Ser.

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Can seal eating explain elevated levels of PCBs and organochlorine pesticides in walrus blubber from eastern Hudson Bay (Canada)?

Cited by 96 publications

References 38 publications

Quantitative dynamics of PCB transfer from mother to pup during lactation in UK grey seals Halichoerus grypus

Quantitative dynamics of PCB transfer from mother to pup during lactation in UK grey seals Halichoerus grypus

Marine mammals and the community structure of the Estuary and Gulf of St Lawrence, Canada: evidence from stable isotope analysis

Influence of habitat, trophic ecology and lipids on, and spatial trends of, organochlorine contaminants in Arctic marine invertebrates

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