ISSN:
1573-5133
Keywords:
Percidae
;
microhabitat use
;
migratory behaviour
;
fecundity
;
resource partitioning
;
fishways
;
warmwater fish passage
;
impoundments
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The biology, microhabitat use and migratory behaviour of the greenside darter, Etheostoma blennioides, was studied at the Mannheim Weir on the Grand River, Ontario during the summer of 1995 and 1996. Officially listed as vulnerable in Canada, greenside darters reached maturity at age 1 and lived up to 4 years. They were found in riffle habitats that consisted of cobble and loose boulders, with large mats of Cladophora. This type of unembedded substrate is uncommon in the Grand River watershed. However, local abundance of greenside darters immediately downstream from the Mannheim Weir was likely due to high water velocities from weir discharge, freshets and ice scour which help maintain unembedded riffle areas. Trap data indicated that greenside darters temporally partition this habitat with the stonecat, Noturus flavus. Other darter species were not commonly found in areas with greenside darters, whose depth selection and habitat choices were influenced by predators and morphology. Denil fishways at the Mannheim Weir rarely passed greenside darters due to prohibitively high water velocities and exclusion by larger fish.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007444811400
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