Abstract
Individual and temporal variability in the spawning behaviour of Atlantic Cod (Gadus morhua L.) was examined by studying wild and reared individuals from the same putative population in a common spawning arena. The number of eggs fertilized per male was best explained by the number of aggressive interactions initiated by each male. A strong skew in male reproductive success and a temporal shift in male fertilization success were also observed. The latter co-occurred with an apparent similar temporal shift in the reproductive behaviour of the individual males. We hypothesize that energetic costs associated with reproduction, potentially mediated by sperm depletion in dominant individuals, may be responsible for temporal shifts in mating behaviour and reproductive success of male Atlantic Cod. We suggest that this hypothesis merits further study.
References
Alatalo RV, Höglund J, Lundberg A, Sutherland WJ (1992) Evolution of black grouse leks-Female preferences benefit males in larger leks. Behav Ecol 3:53–59
Bekkevold D, Hansen MM, Loeschcke V (2002) Male reproductive competition in spawning aggregations of Atlantic Cod (Gadus morhua L.). Mol Ecol 11:91–102
Berglund A (1997) Mating systems and sex allocation. In: Godin JGJ (ed) Behavioural ecology of teleost. Oxford University Press, Oxford, pp 237–265
Blanchard JL, Frank KT, Simon JE (2003) Effects of condition on fecundity and total egg production of eastern Scotian Shelf haddock (Melanogrammus aeglefinus). Can J Fish Aquat Sci 60:321–332
Bradbury JW, Vehrencamp SL, Gibson RM (1985) Leks and the unanimity of female choice. In: Greenwood PJ, Harvey PH, Slatkin M (eds) Evolution: essays in the honour of John Maynard Smith. Cambridge University Press, Cambridge, pp 301–314
Brander K (1994) Spawning and life history information for North Atlantic Cod stocks. ICES Coop Res Rap 205
Brawn VM (1961) Reproductive behaviour of the cod (Gadus callarias L.). Behaviour 18:177–197
Duchesne P, Godbout MH, Bernatchez L (2002) PAPA (Package for the Analysis of Parental Allocation): a computer program for simulated and real parental allocation. Mol Ecol Notes 2:191–193
Fleming IA, Jonsson B, Gross MR, Lamberg A (1996) An experimental study of the reproductive behaviour and success of farmed and wild Atlantic salmon (Salmo salar). J Appl Ecol 33:893–905
Höglund J, Alatalo RV (1995) Leks. Princeton Press, Princeton
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
Karlsen Ø, Holm JC (1994) Ultrasonography, a noninvasive method for sex determination in cod (Gadus morhua). J Fish Biol 44:965–971
Kjesbu OS (1989) The spawning activity of cod, Gadus morhua L. J Fish Biol 34:195–206
Morgan MJ, Trippel EA (1996) Skewed sex-ratios in spawning shoals of Atlantic Cod (Gadus morhua). ICES J Mar Sci 53:820–826
Noldus LPJJ (1991) The Observer—a software system for collection and analysis of observational data. Behav Res Meth Inst Comp 23:415–429
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 spawner? Fish Fish 1:90–93
Pinheiro JC, Bates DM (2000) Mixed-effects models in S and S-PLUS. Springer, London
Robichaud D, Rose GA (2001) Multiyear homing of Atlantic Cod to a spawning ground. Can J Fish Aquat Sci 58:2325–2329
Robichaud D, Rose GA (2003) Sex differences in cod residency on a spawning ground. Fish Res 60:33–43
Rowe S, Hutchings JA (2004) The function of sound production by Atlantic Cod as inferred from patterns of variation in drumming muscle mass. Can J Zool 82:1391–1398
Rowe S, Hutchings JA (2006) Sound production by Atlantic Cod during spawning. Trans Am Fish Soc 135:529–538
Rowe S, Hutchings JA (2008) A link between sound producing musculature and mating success in Atlantic Cod. J Fish Biol 72:500–511
Rowe S, Hutchings JA, Skjæraasen JE (2007) Non-random mating in a broadcast spawner: mate size influences reproductive success in Atlantic Cod (Gadus morhua). Can J Fish Aquat Sci 64:219–226
Rowe S, Hutchings JA, Skjæraasen JE, Bezanson L (2008) Morphological and behavioural correlates of reproductive success in Atlantic Cod Gadus morhua. Mar Ecol Prog Ser 354:257–265
Skjæraasen JE, Rowe S, Hutchings JA (2006) Sexual dimorphism in pelvic fin length in Atlantic Cod. Can J Zool 84:865–870
Stockley P, Gage MJG, Parker GA, Møller AP (1997) Sperm competition in fishes: the evolution of testis size and ejaculate characteristics. Am Nat 149:933–954
Weir LK, Hutchings JA, Fleming IA, Einum S (2004) Dominance relationships and behavioural correlates of individual spawning success in farmed and wild male Atlantic salmon, Salmo salar. J Anim Ecol 73:1069–1079
Windle MJS, Rose GA (2007) Do cod form spawning leks? Evidence from a Newfoundland spawning ground. Mar Biol 150:671–680
Acknowledgements
We thank J. Eddington, P. Avendaño and C. Smith for help with the technical labour, analyses of results and input to the experimental set-up. Thanks to T. Nilsen for statistical advice. J. Titelman kindly provided feedback on the manuscript. The research conducted in this study was approved by the Dalhousie University Animal Care Committee and complied with the guidelines of the Canadian Council for Animal Research. The study was sponsored by the Norwegian Research Council-project (172649/S40 entitled, “Interactions between wild and farmed cod; non-lethal impacts of escapees on wild populations)”, and by a Natural Sciences and Engineering Research Council (Canada) Discovery Grant to JAH.
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Skjæraasen, J.E., Hutchings, J.A. Shifting reproductive success in a shoal of Atlantic Cod, Gadus morhua L.. Environ Biol Fish 88, 311–318 (2010). https://doi.org/10.1007/s10641-010-9650-9
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DOI: https://doi.org/10.1007/s10641-010-9650-9