Studies at Sable Island in Nova Scotia and other locations imply that the breeding season can be an important time for spread of the codworm parasite. It is thought that pups lack resistance to this parasite, and their concentrations in breeding areas are correlated with incidence of marine transmission to certain fisheries. For example several thousand pups may be born at Sable Island annually and the subsequent incidence of cod worm is correlated temporally with dispersal patterns of the pups, with the seal breeding grounds at the epicenter, according to Anderson.
- * Encyclopedia of Earth. Authors; Encyclopedia of Life; Peter Saundry. 2011. "Grey seal". Topic ed. C.Michael Hogan. Ed.-in-Chief. Cutler J.Cleveland http://www.eoearth.org/article/Grey_seal .
- * Anderson, R.C. 2000. "Nematode parasites of vertebrates: their development and transmission", CAB International, 672 pages ISBN: 0851994210
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