Feeding pressure of Mytilus edulis and Styela clava on phytoplankton and zooplankton, including lobster larvae (stages I and IV) / by R. Sonier … [et al.]. : Fs97-6/3263E-PDF

"This report provides insight on feeding pressures of cultivated blue mussels Mytilus edulis and the invasive solitary tunicate Styela clava on phytoplankton and zooplankton, including American lobster (Homarus americanus) larvae (stages I and IV). In 2015-2016, experiments were conducted in a portable aquatic laboratory on Prince Edward Island (PEI) using natural sea water. Average standardized (for 1g of dried tissue weight) clearance rates (CR) were of 12.5 ± 1.12 Lh-1g-1 and 6.7 ± 0.7 Lh-1g-1 for mussels and tunicates respectively. Scaling up these results to a bay scale model that integrates mussels and tunicates feeding pressures on phytoplankton in Malpeque Bay (PEI) showed the importance of mitigation measures and treatment regimes on tunicate populations. A retention of zooplankton was detected at approximately 35 ± 9.4% and 28 ± 9.0 % by mussels and tunicates respectively with a slight preference for copepods. As for predation on lobster larvae (both stages I and IV), M. edulis and S. clava demonstrated no retention or capture of lobster larvae, even at densities which surpass significantly natural lobster larvae abundance in the natural environment. It is anticipated that the information presented in this report will serve in future modelling and management analysis"--Abstract, p. vi.

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