Aspects of the biology and distribution of pteropods (Gastropoda; Opisthobranchia) from the Bay of Fundy region, Canada

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Abstract
Examination of zooplankton samples from the Bay of Fundy and its adjacent waters over a 9-year period revealed two common pteropod species. Limacina retroversa (Thecosomata) and Clione limacina (Gymnosomata). Two other species, Clio pyramidata (Euthecosomata) and Corolla calceola (Pseudothecosomata) were infrequently collected. Long-term horizontal distributional analyses of L. retroversa and C. limacina indicated both seasonal and annual fluctuations in abundance. Reproductive hermaphrodites of L. retroversa were present within the Bay during the spring, and probably spawned during late spring and early fall. The distribution and reproductive stages are discussed in relation to water currents, temperature and salinity parameters, and trophic relationships.

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