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The impact of hydrological variation on the seasonal occurrence and migratory timing of freshwater fish species in the lower St. Lawrence River

Marchand, F. et de Lafontaine, Y. (2003). The impact of hydrological variation on the seasonal occurrence and migratory timing of freshwater fish species in the lower St. Lawrence River. [Publication gouvernementale]

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Résumé

Knowledge of the movement and seasonal distribution of local fish assemblages in the lower St. Lawrence River was incomplete and the importance of hydrological variability on fish distribution patterns was not fully understood. Given the variability in river level at both seasonal and interannual scales, the objective of this study was to test the hypothesis that variation in river level would affect the distribution dynamics of local fish assemblages in the lower St. Lawrence River. Using long-term data series (28 years) of both river level and fish catches at a fixed location, we examined the empirical relationships between attributes of the hydrological regime and the annual distribution patterns of 38 fish species. Results indicated that the annual timing and/or the duration of occurrence of 20 fish species components were significantly related to the river level. Correlation analysis indicated that an increase in the spring river level would delay the annual timing of occurrence of the spring fish components. In contrast, high autumn river level was associated with earlier timing of occurrence for fall fish components. Summer fish components appeared to be relatively unaffected by interannual variations in level. These results indicated that proposed scenarios for water level management in the St. Lawrence River should incorporate the temporal distribution and migratory patterns of fish in response to water level variations. These fish responses will inevitably have a direct influence on fishing activities and profitability of fisheries in the lower St. Lawrence River.

Type de document: Publication gouvernementale
Nombre de pages: 44
Éditeur: St. Lawrence Centre, Environment Canada
Lieu de publication: Montréal
Statut du texte intégral: Public
Mots-clés libres: Local fish assemblages, Hydrological variability, Temporal distribution of fish, Migratory patterns of fish, Water level management, Fishing activities
Sujets: 2. Milieu physique > 2.4. Hydrologie
4. Faune > 4.2. Poisson
7. Usages > 7.1. Pêche
Date de dépôt: 19 avr. 2017 13:37
Dernière modification: 19 avr. 2017 13:37
URI: http://belsp.uqtr.ca/id/eprint/1186

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