Assertion: sea otter's survival | /r/HasProperty | -down effects
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Source sentences:
text: Because of differences in sea otters’ use of mussels outside of KEFJ, and the varying densities of sea otters across the Gulf, the Gulf-wide decline in large mussels was not attributed solely to sea otters, but rather to the combined effects of a broad suite of predators on post-settlement survival (top-down effects).