Thomas E. Thompson

Ecological Changes Following an Alewife Introduction in an Oligotrophic Reservoir: A Case History

Fisheries Outstanding Technical Paper

Alewife (Alosa pseudoharengus) was introduced into oligotrophic Mayo Reservoir, North Carolina, during 1992 or 1993. The species established a self-sustaining population and increased from <1% of total fish biomass in 1993 to 31% in 2000. Size-selective planktivory by the species, a well-documented phenomenon in other alewife introductions, was implicated in observed changes in the reservoir zooplankton community. Large- and mid-sized zooplankton (> 0.7 mm) (Onchyodiaptomus birgei, calanoid copepodites, Daphnia spp., Diaphanosoma brachyurum, and Holopedium gibberum) decreased in...