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JOURNAL OF PLANKTON RESEARCH | VOLUME 11 | NUMBER 3 | PAGES 419-430 | 1989
© Oxford University Press

research-article

Amphipods, isopods and surface currents: a case for passive dispersal in the Bay of Fundy, Canada

A. Locke1 and S. Corey

Department of Zoology, University of Guelph Guelph, Ontario, Canada N1G 2W1 1Present address: Department of Zoology, Erindale College, University of Toronto, Mississauga, Ontario, Canada L5L 1C6

Received on December 9, 1986; accepted on November 17, 1988 Six species of isopods and 18 species of amphipods were collected in the neuston of the Bay of Fundy and adjacent waters. Collections were made over a grid of stations covering 2.4x104 km2 during three spring, three summer and two autumn surveys. No isopods and only five species of amphipods were found in spring surveys. Isopods and amphipods were diverse and plentiful in the neuston in summer and autumn. Dominant isopods were Idotea baltica and I.metallica, and dominant amphipods were Calliopius laeviusculus and Parathemisto gaudichaudi. Amphipods and isopods reach the neuston of the Bay of Fundy in three ways. Idotea metallica, the only euneustonic species present, was probably advected into the Bay of Fundy from southern waters in summer, and did not appear to overwinter in the Bay. Most species, including I.baltica, were collected with drifting littoral vegetation, and we suggest that transport by surface currents is an important factor in dispersal of some shoreline crustaceans. Midwater plankton, such as Parathemisto gaudichaudi, reached the neuston either by advection in upwelling waters or by an extension of their normal diel vertical distribution.


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