Covariation between grey seal (Halichoerus grypus) abundance and natural mortality of cod (Gadus morhua) in the southern Gulf of St. Lawrence

Canadian Journal of Fisheries and Aquatic Sciences

Volumn 62, Issue 9, 2005, Pages 1991-2000

  Chouinard, G A ^a   Swain, D P ^a   Hammill, M O ^b   Poirier, G A ^a  

^a GULF FISHERIES CENTRE   (Canada)

^b FISHERIES AND OCEANS CANADA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

GADOID FISHERY; MORTALITY; PINNIPED; PREDATION;

ATLANTIC OCEAN; GULF OF SAINT LAWRENCE;

GADUS MORHUA; HALICHOERUS GRYPUS;

EID: 29244460668     PISSN: 0706652X     EISSN: None     Source Type: Journal    
DOI: 10.1139/f05-107     Document Type: Article

References (38)

1. Beck, G.G., Hammill, M.O., and Smith, T.G. 1993. Seasonal variation in the diet of harp seals, Phoca groenlandica, from the Gulf of St. Lawrence and western Hudson Strait. Can. J. Fish. Aquat. Sci. 50: 1363-1371.
2. Bowen, W.D. 2000. Reconstruction of pinniped diets: accounting for complete digestion of otoliths and cephalopod beaks. Can. J. Fish. Aquat. Sci. 57: 898-905.
3. Bowen, W.D., Lawson, J.W., and Beck, B. 1993. Seasonal and geographical variation in the species composition and size of prey consumed by grey seals (Halichoerus grypus) on the Scotian Shelf. Can. J. Fish. Aquat. Sci. 50: 1768-1778.
4. Bowen, W.D., McMillan, J., and Mohn, R. 2003. Sustained exponential population growth of grey seals at Sable Island, Nova Scotia. ICES J. Mar. Sci. 60: 1265-1274.
5. Burnham, K.P., and Anderson, D.R. 1998. Model selection and inference. A practical information-theoretic approach. Springer, New York.
6. Campana, S.E., Mohn, R.K., Smith, S.J., and Chouinard, G.A. 1995. Spatial implications of a temperature-based growth model for Atlantic cod (Gadus morhua) off the eastern coast of Canada. Can. J. Fish. Aquat. Sci. 52: 2445-2456.
7. Chouinard, G.A., Swain, D.P., Currie, L., Poirier, G.A., Rondeau, A., Benoît, H., Hurlbut, T., and Daigle, D. 2003. Assessment of the southern Gulf of St. Lawrence cod stock, February 2003 / Évaluation du stock de morue du sud du Golfe du St-Laurent, février 2003. DFO Can. Sci. Advis. Secretariat Res. Doc. 2003/015.
8. Croxall, J.P. 1993. Diet. In Antarctic seals research methods and techniques Edited by R.M. Laws. Cambridge University Press, Cambridge, UK. pp. 268-290.
9. Fu, C., and Quinn, T.J., II. 2000. Estimability of natural mortality and other population parameters in a length-based model: Pandalus borealis in Kachemak Bay, Alaska. Can. J. Fish. Aquat. Sci. 57: 2430-2432.
10. Fu, C., Mohn, R., and Fanning, L.P. 2001. Why the Atlantic cod (Gadus morhua) stock off eastern Nova Scotia has not recovered. Can. J. Fish. Aquat. Sci. 58: 1613-1623.
11. Gavaris, S. 1988. An adaptive framework for the estimation of population size. Can. Atl. Fish. Sci. Advis. Comm. Res. Doc. 88/29.
12. Goulet, A.-M., Hammill, M.O., and Barrette, C. 2001. Movements and diving activities of grey seal females (Halichoerus grypus) in the Gulf of St. Lawrence, Canada. Polar Biol. 24: 432-439.
13. Hammill, M.O., and Gosselin, J.F. 1995. Reproductive rates, age of maturity and age at first birth in Northwest Atlantic grey seals (Halichoerus grypus). Can. J. Fish. Aquat. Sci. 52: 2757-2761.
14. Hammill, M.O., and Stenson, G.B. 2000. Estimated prey consumption by harp seals (Phoca groenlandica), hooded seals (Cystophora cristata), grey seals (Halichoerus grypus) and harbour seals (Phoca vitulina) in Atlantic Canada. J. Northwest Atl. Fish. Sci. 26: 1-23.
15. Hammill, M.O., and Stenson, G.B. 2002. Estimated consumption of Atlantic cod (Gadus morhua) and some other prey by grey seals (Halichoerus grypus) and harp seals (Phoca groenlandica) in the southern Gulf of St. Lawrence (NAFO zone 4T). Can. Sci. Advis. Seer. Res. Doc. 2002/054.
16. Hammill, M.O., Stenson, G.B., Myers, R.A., and Stobo, W.T. 1998. Pup production and population trends of the grey seal (Halichoerus grypus) in the Gulf of St. Lawrence. Can. J. Fish. Aquat. Sci. 55: 423-430.
17. Hammond, P.S., Hall, A.J., and Prime, J.H. 1994a. The diet of grey seals around Orkney and other island and mainland sites in north-eastern Scotland. J. Appl. Ecol. 31: 340-350.
18. Hammond, P.S., Hall, A.J., and Prime, J.H. 1994b. The diet of grey seals in the Inner and Outer Hebrides. J. Appl. Ecol. 31: 737-746.
19. Hurlbut, T., and Clay, D. 1990. Protocols for research survey cruises within the Gulf Region (demersal fish) (1970-1987). Can. Manuscr. Rep. Fish. Aquat. Sci. No. 2082.
20. Iverson, S.J., Field, C., Bowen, W.D., and Blanchard, W. 2004. Quantitative fatty acid signature analysis: a new method of estimating predator diets. Ecol. Monogr. 74: 211-235.
21. Lambert, Y., and Dutil, J.-D. 1997. Condition and energy reserves of Atlantic cod (Gadus morhua) during the collapse of the northern Gulf of St. Lawrence stock. Can. J. Fish. Aquat. Sci. 54: 2388-2400.
22. Lavigueur, L., and Hammill, M.O. 1993. Distribution and seasonal movements of grey seals, Halichoerus grypus, in the Gulf of St. Lawrence. Can. Field-Nat. 107: 329-340.
23. Lunneryd, S.G. 2001. Fish preference by the harbour seal (Phoca vitulina), with implications for the control of damage to fishing gear. ICES J. Mar. Sci. 58: 824-829.
24. Megrey, B.A. 1989. Review and comparison of age-structured stock assessment models from theoretical and applied points of view. In Mathematical analysis of fish stock dynamics. Edited by E.F. Edwards and B.A. Megrey. Am. Fish. Soc. Symp. 6: 8-48.
25. Mohn, R., and Bowen, W.D. 1996. Grey seal predation on the eastern Scotian Shelf: modelling the impact on Atlantic cod. Can. J. Fish. Aquat. Sci. 53: 2722-2738.
26. Moore, P.G. 2003. Seals and fisheries in the Clyde sea area (Scotland): traditional knowledge informs science. Fish. Res. 63: 51-61.
27. Murie, D.J., and Lavigne, D.M. 1985. Digestion and retention of Atlantic herring otoliths in the stomachs of grey seals. In Marine mammals and fisheries. Edited by J.R. Beddington, R.J.H. Beverton, and D.M. Lavigne. George Allen and Unwin, London, UK. pp. 293-299.
28. Myers, R.A., and Cadigan, N.G. 1995. Was an increase in natural mortality responsible for the collapse of northern cod? Can. J. Fish. Aquat. Sci. 52: 1274-1285.
29. Pitcher, K.W. 1980. Stomach contents and faeces as indicators of harbor seal, Phoca vitulina, diets in the Gulf of Alaska. Fish. Bull. 78: 797-798.
30. Schnute, J.T., and Richards, L.J. 1995. The influence of error on population estimates from catch-age models. Can. J. Fish. Aquat. Sci. 52: 2063-2077.
31. Shelton, P.A., and Lilly, G.R. 2000. Interpreting the collapse of the northern cod stock from survey and catch data. Can. J. Fish. Aquat. Sci. 57: 2230-2239.
32. Shelton, P.A., Warren, W.G., and Stenson, G.B. 1997. Quantifying some of the major sources of uncertainty associated with estimates of harp seal prey consumption. Part II. Uncertainty in consumption estimates associated with population size, residency, energy requirement and diet. J. Northwest Atl. Fish. Sci. 22: 303-315.
33. Sinclair, A.F. 2001. Natural mortality of cod (Gadus morhua) in the southern Gulf of St. Lawrence. ICES J. Mar. Sci. 58: 1-10.
34. Sinclair, A.F., and Murawski, S.A. 1997. Why have groundfish stocks declined ? In Northwest Atlantic groundfish: perspectives on a fishery collapse. Edited by J. Boreman, B.S. Nakashima, J.A. Wilson, and R.L. Kendall. American Fisheries Society, Bethesda, Md. pp. 71-93.
35. Sinclair, A.F., Swain, D.P., and Hanson, J.M. 2002. Disentangling the effects of size-selective mortality, density, and temperature on length-at-age. Can. J. Fish. Aquat. Sci. 59: 372-382.
36. Stenson, G.B., Hammill, M.O., and. Lawson, J.W. 1997. Predation by harp seals in Atlantic Canada: preliminary consumption estimates for Arctic cod, capelin and Atlantic cod. J. Northwest Atl. Fish. Sci. 22: 137-154.
37. Stobo, W.T., Beck, B., and Horne, J.K. 1990. Seasonal movements of grey seals (Halichoerus grypus) in the Northwest Atlantic. Can. Bull. Fish. Aquat. Sci. No. 222. pp. 199-213.
38. Swain, D.P., Sinclair, A.F., Castonguay, M., Chouinard, G.A., Drinkwater, K.F., Fanning, L.P., and Clark, D.S. 2003. Density-versus temperature-dependent growth of Atlantic cod (Gadus morhua) in the Gulf of St. Lawrence and on the Scotian Shelf. Fish. Res. 59: 327-341.