Effects of Mosquito Control Water Management on Soil Chemistry, Hydrology, andFish/Crustacean Microhabitat Associations on Upper Marsh Flats of Rim-Managed Impoundments and Tidal Marshes

摘要

Sulfide dynamics examined in Indian River lagoon impoundment ditches and anatural tidal creek both demonstrated increasing concentrations during the summer with peaks in the fall/winter coinciding with maximum litter inputs. Sulfide levels were not generally lethal to aquatic organisms. Cyprinodon varieqatus (sheepshead minnow) individuals exhibited territoriality over a 0.5 m. area where mating occurs and their populations increase during the summer flooding period of Rotational Impoundment Management (RIM). RIM adversely affected Uca (fiddler crab) burrow densities and distribution with a complete loss of burrows at low elevations. Uca densities were greatest at densely vegetated study sites. Impoundment management practices which minimize both the summer flooding period and water level, thus limiting vegetation mortality, is strongly encouraged.