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The effect of flow disturbance on the distribution and abundance of zooplanktonic particles was investigated around an isolated, steep-sided reef, in the south Coral Sea. North-flowing current >0J m s"1 caused doming of isotherms by 20-30 m in the flow-disturbed region at the north-western side of the island. The nutricline and the chlorophyll maximum were at 80-100 m in the free stream and 50-70 m in the flow-disturbed region. Over all depths combined, chlorophyll and nutrients were 1.4 times gTeater in the disturbed region. There was a strong correlation between the depth of the mixed layer, the depth of the chlorophyll maximum and the depth of the peak abundances of zoo- plankton between 300 and 1000 urn equivalent spherical diameter (esd; measured with an optical plankton counter). Slopes of the log-normalized abundance of 19 particle size classes between 300 and 2500 um esd indicated that all particle size classes were more strongly represented in the flow- disturbed region than in the free stream, but that the difference was relatively greater for small plank- ton. This indicates increased production by smaller zooplankton. Using size and taxonomic information from image analysis of net-collected samples, the relative composition of zooplankton did not differ between regions and was dominated by the calanoid copepods Pleuromamma and Acartia, and the cyclopoid copepod Oncaae. Multi-dimensional scaling snowed that the particle size community was not significantly different within or between nights, but most flow-disturbed stations were significantly different from the free-stream stations, consistent with current flow. Nutrient uplift into the photic zone in an oligotrophic tropical ocean has a significant impact on zooplankton size structure, and ultimately fish production.

Enhanced zooplankton abundance in the lee of an isolated reef in the south Coral Sea: the role of flow disturbance