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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 4 | PAGES 671-690 | 1998
© Oxford University Press

research-article

Nearshore abundance of zooplankton in relation to shoreline configuration and mechanisms involved

Philippe Archambault1, John C. Roff2, Edwin Bourget1,5, Bohuyn Bang3 and Grant R. Ingram4

1GIROQ, Département de Biologie, Université Laval Québec, Qué. G1K 7P4, Canada 2Department of Zoology, University of Guelph Guelph, Ont. N1G 2W1, Canada 3GIROQ, Department of Atmospheric and Oceanic Sciences, McGill University Montréal, Qué H3A 2K6, Canada 4Department of Earth and Ocean Sciences, University of British Columbia 6270 University Blvd, Vancouver, BC V6T 1Z4, Canada

5To whom correspondence should be addressed

Received on September 2, 1997; accepted on November 19, 1997 Zooplankton abundance was examined in relation to shoreline configuration. Four embayments (0.15, 1.5, 4 and 7 km opening) were each divided into three zones, corresponding to regions inside, outside and downstream. A portion of straight coast [{small tilde}12 km, Sainte-Flavie (SF)] was also divided into three zones. Only the largest embayment was sampled in 1993, but all embayments and SF were sampled in 1994. In 1993, zooplankton abundance was significantly higher within the embayinent than in external zones for six of seven dates. Zones inside the four embayments had generally higher zooplankton abundance than zones external to the embayments in 1994, but the opposite was observed during the first of two sampling dates for the largest embayments. No definite pattern was observed among zones along SF. Four hypotheses could explain the higher abundance of zooplankton inside embayments. Three were tested using meroplankton (M)/holoplankton (H) ratios. The M/H ratios confirmed hypotheses of retention and local production of meroplanktonic larvae inside embayments. Zooplankton abundance was lower inside than in zones external to embay ments only twice, and wind direction may have been responsible for these results. No embayment size effect on zooplankton abundance was detected. The patchy distribution of zooplankton may increase the difficulty of observing an effect of embayment size on zooplankton abundance.


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