Abstract
Catch and acoustic telemetry data were used to test three predictions of lekking behaviour in Atlantic cod (Gadus morhua L.) at a small-scale spawning ground (∼25 km2) in Placentia Bay, Newfoundland: (1) that cod form male-skewed aggregations during spawning; (2) spawning arenas occur at consistent sites; and (3) on the arenas, there will be higher proportions of spawning fish. Forty-two fishing sets from 1998 to 2003 indicated male-skewed sets early in the spawning season (April) in 5 of 6 survey years. Male-skewed sets were consistently distributed at depths < 50 m and mostly in one part of the ground. The proportions of spawning females and spent males were significantly higher in male-skewed sets, whereas sets with equal sex ratios had significantly higher proportions of immature males and spent females. In addition, cod of both sexes were significantly larger in male-skewed sets. Telemetric tracking of 25 cod in 2002 and 2003 (12 males, 13 females) indicated that both males and females were highly mobile while present on the spawning ground. Overall, our results add support to the hypothesis that cod employ a lekking mating system.
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References
Bekkevold D, Hansen MM, Loeschcke V (2002) Male reproductive competition in spawning aggregations of cod (Gadus morhua, L.). Mol Ecol 11:91–102
Bradbury IR, Snelgrove PVR, Fraser S (2000) Transport and development of eggs and larvae of Atlantic cod, Gadus morhua, in relation to spawning time and location in coastal Newfoundland. Can J Fish Aquat Sci 57:1761–1772
Brattey J., Healey B (2003) Updated estimates of exploitation from tagging of Atlantic cod (Gadus morhua) in NAFO Subdivision 3Ps during 1997–2003. Can Sci Adv Sec Res Doc 2003/091
Brawn VM (1961a) Reproductive behaviour of the cod (Gadus callarias L.). Behaviour 18:177–197
Brawn VM (1961b) Aggressive behaviour in the cod (Gadus callarias L.). Behaviour 18:107–147
Donaldson TJ (1995) Courtship and spawning of nine species of wrasses (Labridae) from the western Pacific. Jpn J Ichthyol 42:311–319
Figenschou L, Folstad I, Liljedal S (2004) Lek fidelity of male Arctic charr. Can J Zool 82:1278–1284
Foote KG, Knudsen HP, Vestnes G, MacLennan DN, Simmonds EJ (1987) Calibration of acoustic instruments for fish density estimation: a practical guide. ICES Coop Res Rep no. 144
Gladstone W (1994) Lek-like spawning, parental care and mating periodicity of the triggerfish Pseudobalistes flavimarginatus (Balistidae). Environ Biol Fish 39:249–257
Höglund J, Alatalo RV (1995) Leks. Princeton University Press, Princeton
Hutchings JA, Myers RA (1993) Effect of age on the seasonality of maturation and spawning of Atlantic cod, Gadus morhua, in the Northwest Atlantic. Can J Fish Aquat Sci 50:2468–2474
Hutchings JA, Bishop TD, McGregor-Shaw CR (1999) Spawning behaviour of Atlantic cod, Gadus morhua: evidence of mate competition and mate choice in a broadcast spawner. Can J Fish Aquat Sci 56:97–104
Kjesbu OS (1989) The spawning activity of cod, Gadus morhua L. J Fish Biol 34:195–206
Lawson GL, Rose GA (2000) Small-scale spatial and temporal patterns in spawning of Atlantic cod (Gadus morhua) in coastal Newfoundland waters. Can J Fish Aquat Sci 57:1011–1024
Loiselle PV, Barlow GW (1978) Do fishes lek like birds? In: Reese ES, Lighter FJ (eds) Contrasts in behaviour:adaptations in the aquatic and terrestrial environments. Wiley, New York pp 31–76
McKaye KR (1983) Ecology and breeding behavior of a cichlid fish, Cyrtocara eucinostomus, on a large lek in Lake Malawi, Africa. Environ Biol Fish 8:81–96
McKenzie RA (1940) Nova Scotian autumn cod spawning. J Fish Res Board Can 5:105–120
Mello LGS, Rose GA (2005) Seasonal growth of Atlantic cod: effects of temperature, feeding and reproduction. J Fish Biol 67:149–170
Morgan MJ, Trippel EA (1996) Skewed sex ratios in spawning shoals of Atlantic cod (Gadus morhua). ICES J Mar Sci 53:820–826
Morrison CM (1990) Histology of the Atlantic cod, Gadus morhua: an atlas. Part 3. Reproductive tract. Can Spec Publ Fish Aquat Sci no. 110
Nordeide JT (1998) Coastal cod and north-east Arctic cod—do they mingle at the spawning grounds in Lofoten? Sarsia 83:373–379
Nordeide JT, Folstad I (2000) Is cod lekking or a promiscuous group spawning? Fish Fisheries 1:90–93
Rakitin A, Ferguson MM, Trippel EA (2001) Male reproductive success and body size in Atlantic cod Gadus morhua L. Mar Biol 138:1077–1085
Robichaud D, Rose GA (2001) Multiyear homing of Atlantic cod to a spawning ground. Can J Fish Aquat Sci 58:2325–2339
Robichaud D, Rose GA (2002a) The return of cod transplanted from a spawning ground in southern Newfoundland. ICES J Mar Sci 59:1285–1293
Robichaud D, Rose GA (2002b) Assessing evacuation rates and spawning abundance of marine fishes using coupled telemetric and acoustic surveys. ICES J Mar Sci 59:254–260
Robichaud D, Rose GA (2003) Sex differences in cod residency on a spawning ground. Fish Res 60:33–43
Robichaud D, Rose GA (2004) Migratory behaviour and range in Atlantic cod: inference from a century of tagging. Fish Fisheries 5:1–31
Rose GA (1993) Cod spawning on a migration highway in the north-west Atlantic. Nature 366:458–461
Rose GA (2003) Monitoring coastal northern cod: towards an optimal survey of Smith Sound, Newfoundland. ICES J Mar Sci 60:453–462
Rowe S, Hutchings JA (2003) Mating systems and the conservation of commercially exploited marine fish. Trends Ecol Evol 18:567–572
Wedekind C (1996) Lek-like spawning behaviour and different female mate preferences in roach (Rutilus rutilus). Behaviour 133:681–695
Windle MJS, Rose GA (2005) Migration route familiarity and homing of transplanted cod (Gadus morhua). Fish Res 75:193–199
Acknowledgements
This research was funded by an NSERC Discovery grant to G.A.R., the NSERC Industrial Chair in Fisheries Conservation, and NWT graduate support to M.J.S.W. We thank W. Hiscock, S. Fudge, G. D. Sherwood and Fisheries Conservation Chair personnel for help with data collection, and the crews of the RV Innovation, RV Mares and C.C.G.S. Shamook for field assistance. We are grateful to J.T. Nordeide and an anonymous referee for their helpful comments on an earlier version of the manuscript. The methods used in this study were compliant with the current laws of Canada.
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Communicated by J.P. Grassle, New Brunswick
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Windle, M.J.S., Rose, G.A. Do cod form spawning leks? Evidence from a Newfoundland spawning ground. Mar Biol 150, 671–680 (2007). https://doi.org/10.1007/s00227-006-0385-2
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DOI: https://doi.org/10.1007/s00227-006-0385-2