Natural and Man-induced Variability in a Silverjaw Minnow (Ericymba buccata) Population

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Abstract
During 8 yr of fish sampling in an agricultural watershed, density of the silverjaw minnow E. buccata fluctuated widely with a population outbreak in 1976 followed by a rapid decline. Accompanying these fluctuations were changes in population structure that were linked to differential mortality and variation in recruitment. Factors responsible for the demise of this species in the watershed included: severe droughts in 1976 and 1978; consecutive harsh winters in 1976-1977, 1977-1978 and 1978-1979; fish kills; and modified habitat conditions brought about by stream alterations.