The influence of plant community on chironomid secondary production in two wetland types: cypress-gum swamps and grass-sedge marshes
Entrekin, Sally A.; Golladay, Stephen W.; Batzer, Darold P.
published: Oct 18, 2001
ArtNo. ESP141015203004, Price: 29.00 €
We sampled Chironomidae larvae (Diptera) diversity, density, biomass, and secondary production within three cypress-gum swamps and three grass-sedge marshes in Southwest Georgia, U.S.A. These wetlands flood seasonally, and were inundated from November 1998 through April 1999. Chironomid diversity was greatest in the grass-sedge marshes, although the same genera dominated both wetland types. Total mean biomass ranged from 449 to 1154 mg AFDM/m2 in cypress-gum swamps and 268 to 2116 mg AFDM/m2 in the grass-sedge marshes. Density of chironomids showed similar patterns of variation as biomass. Production ranged from 649 to 2000 mg AFDM/m2 in cypress-gum swamps and 562 to 4853 mg AFDM/m2 in grass-sedge marshes over a five month hydroperiod. Additionally, laboratory growth studies using cultured chironomids fed benthic detritus were conducted to further examine the influence of food quality on chironomid growth. The variation in chironomid density, biomass, and production among the wetlands seems to be attributable to an interaction among biotic and abiotic variables including hydroperiod, food quality, and chironomid species assemblage.