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Detecting the environmental impacts of human activities on natural communities is a central problem in applied ecology. It is a difficult problem because one must separate human perturbations from the considerable natural temporal variability displayed by most populations. In addition, most human perturbations are generally unique and thus unreplicated.(More)
The biological and physical factors that affect the distribution of the subtidal, epibenthic, sand-dwelling cnidarian Renilla kollikeri along a depth gradient from 2 to 13 m were determined by manipulative field and laboratory experiments. The sea pansy's nearshore distributional limit (2.5 m in depth) was set by the animal's inability to remain anchored on(More)
At two stations in the San Onofre kelp bed near San Clemente, California the abundance of sea urchins, Lytechinus anamesus, and starfish, Patiria miniata, were negatively correlated. At one station, urchins were more abundant outside compared to inside the kelp bed, a pattern which generally occurs in southern California. In contrast, at the other station(More)
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