Effects of a range-expanding sea urchin on behaviour of commercially fished abalone.

In both Experiment 1 addressing interspecific competition and Experiment 2 addressing intra- and interspecific competition simultaneously, there was a highly significant effect of plot on the movement patterns of urchins and abalone (interspecific competition at day 1, and intra- and interspecific competition at weeks 4 and 6) ( Table 5 ).

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