Habitat specificity of littoral Chydoridae (Crustacea,Branchiopoda, Anomopoda) in Plastic Lake,Ontario, Canada |
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Authors: | Tremel Birgitta Frey S.E. (Libby) Yan Norman D. Somers Keith M. Pawson Trevor W. |
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Affiliation: | (1) Department of Biology, c/o Dorset Environmental Science Centre, York University, Dorset, ON, Canada, P0A 1E0;(2) Present address: Richard Wagner Str. 26, D-19059 Schwerin, Germany;(3) 2625 S. Smith Rd., Bloomington, IN, 47401-8944, U.S.A.;(4) Dorset Environmental Science Centre, Ontario Ministry of the Environment, P.O. Box 39, Dorset, ON, Canada, P0A 1E0;(5) Dorset Environmental Science Centre, Ontario Ministry of the Environment, P.O. Box 39, Dorset, ON, Canada, P0A 1E0 |
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Abstract: | This study identified two scales of pattern in the assemblages of Chydoridae (Crustacea, Branchiopoda, Anomopoda) in the shallow (<2 m) littoral zone of Plastic Lake, Ontario, Canada in the autumn of 1987. Twenty chydorid species were collected in 15 over-night sets of funnel traps in each of four habitat types. Analysis of variance multivariate analysis of variance, and discriminant function analysis revealed that assemblages differed among the habitats. Alona intermedia, Alona quadrangularis and Chydorus bicornutus were particularly abundant in the most structurally diverse habitat type – muddy, rock-strewn areas with approximately 40% bottom cover by the pipewort, Eriocaulon septangulare. In contrast, Anchistropus cf. minor was caught most often on bare shelves of rock. A second set of analyses demonstrated that chydorid assemblages also differed at a smaller scale, i.e. with local patchiness in bottom cover by the dominant macrophyte (E. septangulare). The abundance of Alona affinis was positively correlated with cover by E. septangulare, whereas Anchistropus cf. minor was caught mainly in microhabitats without vegetation. Alona intermedia and A. quadrangularis were most abundant in microhabitats with intermediate amounts of vegetation, suggesting their abundance is influenced by habitat factors other than vegetation. |
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Keywords: | Chydoridae Plastic Lake habitat spatial patchiness |
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