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Occurrence and Biology of Cyathura Polita (Stimpson) (Isopoda, Anthuridae) in Canada

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A large reproducing population of Cyathura polita occurs in the Saint John River estuary, New Brunswick, Canada. This is the first record from Canada and represents a 180 km northeastward extension of the known range for this species. A large portion of the Cyathura population occupies deep (20 m), mesohaline (0.1-200/00) water on bottoms of moderate silt-clay content. The population exhibits protogynic hermaphroditism, a phenomenon common to cyathurans. This occurrence, disjunct from the main center of Cyathura polita distribution to the south, may be a result of an earlier widespread distribution during the Hypsithermal Period with a subsequent fracturing of the range during recent cooler climatic conditions.

Affiliations: 1: Department of Biology, Emory University, Atlanta, Georgia, U.S.A.; 2: Department of Fisheries and Environment, Biological Station, St. Andrews, N.B., E0G 2X0, Canada; 3: Montreal Engineering Company, Fredericton, N.B., Canada


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