(Science: abbreviation) stimulatory protein 1.
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... Beta is 0.5, in other words the interspecific effect on population 2 is less than the intraspecific competition. I would interpret it as beta = (SP1onSP2 < SP2onSP2) = 0.5 < 1 where SP2onSP1 is the interspecific effect on population 2 by population 1, and SP2onSP2 is the intraspecific effect ...
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