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• W2103969072 abstract "Ecological theory for benthic communities emphasizes intense species interactions that depend on the high productivity of sedentary invertebrates. The keystone predator hypothesis maintains that intense predation by one consumer species is necessary to prevent a prolific, competitively dominant prey species from eliminating other species using the same resource. This study considers the consequences of extreme spatial and temporal variation in the recruitment of a prey species supporting keystone and diffuse predation. Prior experiments on rocky shores of Santa Catalina Island, California, USA, demonstrated that predation by spiny lobsters (Panulirus interruptus) maintained a distinctive red algal turf by killing juvenile mussels (Mytilus californianus and M. galloprovincialis) that otherwise overgrow and replace the algae. In the present study, long-term surveys revealed that high recruitment of the predominant mussel, M. californianus, occurred only on the most wave-exposed sites in certain years; mussel recruitment was slight to nil on relatively protected sites in most years. A predator exclosure experiment consisting of seven replicates placed along the gradient of wave exposure demonstrated that the effects of predation depended upon the spatial differences in recruitment rates. Lobsters on wave-exposed sites functioned as keystone predators; on more sheltered sites, little or no predation, whether by lobsters or the fishes and whelks also foraging on the sheltered sites, was necessary to maintain the algal assemblage. Similar species assemblages can be maintained by markedly different relative levels of crucial ecological rates. In the mid-intertidal zone of Santa Catalina Island, the intense species interactions depicted in the keystone predator hypothesis occurred only at productive, high wave exposure locations; low recruitment of mussels elsewhere preempts both predation and the competition between the mussel and algal assemblages. Thus, red algae dominates rocky shores through different mechanisms over a range of physical conditions. The occurrences of low mussel recruitment do not appear to be anomalies, but rather a consequence of the life history of Mytilus californianus." @default.
• W2103969072 created "2016-06-24" @default.
• W2103969072 creator A5070085437 @default.
• W2103969072 date "1997-07-01" @default.
• W2103969072 modified "2023-09-26" @default.
• W2103969072 title "CHANGING RECRUITMENT IN CONSTANT SPECIES ASSEMBLAGES: IMPLICATIONS FOR PREDATION THEORY IN INTERTIDAL COMMUNITIES" @default.
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• W2103969072 doi "https://doi.org/10.1890/0012-9658(1997)078[1400:cricsa]2.0.co;2" @default.
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