Assertion: echinoderm's number | /r/Causes | overgrazing of kelp forests
Facets:
value: with the result
type: OTHER
Source sentences:
text: A diminution of the numbers of predators (otters, lobsters and fish) can result in an increase in urchin numbers causing overgrazing of kelp forests with the result that an alga-denuded "urchin barren" forms.