CGRG Bibliography of Canadian Geomorphology
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Author : Coulombe-Pontbriand, M. ; and Lapointe, M.
Date : 2001.
Title : Study of geomorphological factors controlling the sedimentology of spawning substrate and the resultant selection of spawning sites by atlantic salmon along the valleys of the Petite-Cascapedia and Bonaventure Rivers.
Publication : The Canadian Association of Geographers/l'association Canadienne des Géographes. 2001 Annual Meeting. 50th Anniversary of the CAG Jointly Organised by McGill University, Concordia University and Université de Montréal Tuesday May 29 – Sunday June 3, 2001
Issue :
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Abstract
Geomorphological processes controlling the sedimentology of bed material along a river constitute a key aspect of the study of fluvial processes as well as fish habitat. We tested the hypothesis that Atlantic Salmon select their spawning sites according to the quality of sub-pavement bed material in cobble-bed rivers. The relation between spawning nest location, observed during two consecutive years, and the quality of spawning substrate were statistically analysed using logistic regressions in two neighbouring rivers: the Petite Cascapédia and Bonaventure Rivers, Que. Results showed that, within sites ranging between 1 to 20 percent sand, the probability of nest observation was significantly greater at sites having lower fine content and lesser at sites having higher fine content. Our analysis further supported the substrate quality criteria (sand index < 1) proposed by Peterson and Metcalfe (1981). The degree of lateral confinement of reaches by valley walls seemed to control in part the percentage of sand and, therefore, the quality of spawning habitat.
Bibliography of Canadian Geomorphology