We examine the spatial scale of variability in recruitment for 11 marine, three anadromous, and five freshwater species. Generally the spatial scale of recruitment correlations for marine species is approximately 500 km, compared with less than 50 km for freshwater; anadromous species fall between these two scales. The scale for marine species is comparable with (but less than) that of the largest-scale environmental variables (and is compatible with the idea that large-scale environmental agents influence recruitment). Our results are consistent with the hypothesis that predation is a more important factor in determining recruitment in freshwater than it is in the marine environment.

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We examine the spatial scale of variability in recruitment for 11 marine, three anadromous, and five freshwater species. Generally the spatial scale of recruitment correlations for marine species is approximately 500 km, compared with less than 50 km for freshwater; anadromous species fall between these two scales. The scale for marine species is comparable with (but less than) that of the largest-scale environmental variables (and is compatible with the idea that large-scale environmental agents influence recruitment). Our results are consistent with the hypothesis that predation is a more important factor in determining recruitment in freshwater than it is in the marine environment.Résumé : Nous avons examiné l'échelle spatiale de la variabilité du recrutement chez 11 espèces marines, trois espèces anadromes et cinq espèces d'eau douce. Généralement, l'échelle spatiale des corrélations de recrutement pour les espèces marines est d'environ 500 km, comparativement à moins de 50 km pour les espèces d'eau douce; pour les espèces anadromes, l'échelle se trouvent entre les deux. L'échelle des espèces marines est comparable (mais inférieure) à celle des variables environnementales de la plus grande échelle (et concorde avec l'idée que des agents environnementaux à grande échelle influent sur le recrutement). Nos résultats concordent avec l'hypothèse que la prédation est un facteur plus important pour la détermination du recrutement en eau douce que dans l'environnement marin. [Traduit par la Rédaction]

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According to the match/mismatch hypothesis, larval fish survival and eventual recruitment is dependent on the offset time between the peaks of abundance of larvae and their planktonic prey. A rudimentary larval food supply model is developed to determine the dependence of food availability on the mismatch between peaks. The model predicts that recruitment variability should increase as spawning duration decreases, a result which is moderately supported by an analysis of Atlantic cod (Gadus morhua) data.