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0�C3.5 mm size class and the bulk of the consumption was between the These results at the very least suggest looking beyond the typical ��proportion consumed�� for investigating multiple predator effects. These results are consistent with established foraging ecology of these two crab species on other mussel prey (Mytilus edulis; Lohrer & Whitlatch, 2002; Griffen, 2006). In this study, the observed emergent effect of the two predators when foraging together was dependent on the BLZ945 price predator density��only when two of each predator were foraging together was an effect observed. Prey survival was greater than expected based on the additive experimental design at high predator densities. The detection of risk reduction with the additive experimental design implies that predation interference occurred between the two species, decreasing predation rates below those observed when individuals of each species foraged independently. The shift in prey size structure Sclareol consumed by the predators when foraging together is likely another indication of interference. This may have a positive impact on the larger size classes of Guekensia demissa. Due to the competitive interference between the two species, it is likely that C. maenas might not be afforded time to be a selective feeder, shifting its ��preferred�� prey size down to smaller size classes in presence of interspecifics (Wong, Peterson & Kay, 2010). Hemigrapsus sanguineus consumed a greater number of smaller ribbed mussels than did C. maenas, likely because of its smaller size. Within existing populations of ribbed mussels, the largest individuals should benefit from the reduced predation pressure from C. maenas as salt marsh populations of H. sanguineus increase. However, both smaller mussels and mussel recruitment will likely be negatively impacted over time. Experimental treatments of H. sanguineus consumed more mussels in Dynasore cell line of the other treatments, an observation also made in other studies (Bourdeau & O��Connor, 2003). As densities of H. sanguineus increase, wild populations of ribbed mussels within this size class will be most affected. This can have especially dire consequences for mussel populations��as H. sanguineus populations rise to replace the biomass of predators they are displacing (O��Connor et al., 2008; Hudson, 2011), they can replace the feeding pressure exerted by C. maenas. However, this feeding pressure would be specifically targeting the recruiting classes of mussels, potentially leading to recruitment failure and population decline (O��Connor et al., 2008).

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