Assertion: alewife's level | /r/Causes | the death of glochidia
Facets:
value: after only 24 hours of exposure
type: TEMPORAL
Source sentences:
text: A 2003 study revealed that levels of ammonia far below EPA maximum allowed concentrations caused the death of glochidia after only 24 hours of exposure, which led to a change in allowable ammonia concentrations in surface waters.