Effects of emergent macrophytes on dissolved oxygen dynamics in a prairie pothole wetland

Abstract

Transect measurements, continuous monitoring, and synoptic surveys were used to examine patterns in light availability, temperature, and dissolved oxygen concentrations within and outside emergent vegetation zones in Goose Lake Marsh. a natural prairie pothole wetland in central Iowa. Water column light availability was less than 2% of ambient light in emergent vegetated areas due to canopy cover, small floating plants (lemnids), and plant litter. Water temperatures and dissolved oxygen concentrations were significantly lower and varied less diurnally in vegetated areas. Three habitat zones could be identified based on patterns in vegetation and dissolved oxygen: (1) a zone of dense emergent macrophytes providing significant submerged structure but with nearly or completely anoxic water, (2) a transition zone of sparse emergent macrophytes providing less structure but with more aerobic water, and (3) an open water zone with consistently aerobic water but with little submerged structure. Vegetation patterns are likely to control major aspects of wetland biogeochemistry and trophic dynamics, and wetlands should be viewed as complex mosaics of habitats with distinct structural and functional characteristics.

What Drives Chytrid Infections in Newt Populations? Associations with Substrate, Temperature, and Shade

“…And although leaf litter accounted for more of the ''substrate complexity'' effect, emergent vegetation also lowers water temperature SV-length, snout-vent length a Standardized coefficients are provided for the predictors included in each model. Models were ranked in order of adjusted R 2 b Proportion of meter-sweeps containing dead leaves and/or vegetation and reduces the diurnal temperature range (Rose and Crumpton, 1996), which might affect Bd-host interactions . Shade around the periphery of the pond should substantially decrease the temperature of shallow water, and this in turn might increase susceptibility to infection in newts, which tend to concentrate in the shallow water near the shoreline (Petranka, 1998).…”

Biogeochemical Dynamics II: Cycling and Storage of Phosphorus in Wetlands

“…The open water habitat in wetlands in general is well oxygenated compared with the anoxic conditions characteristic of the emergent marsh environment (Hamilton et al 1995;Rose and Crumpton 1996). Temporal variations are primarily related to the season and the fl uctuating water level conditions.…”

Anaerobic decomposition of a native and an exotic submersed macrophyte in two tropical reservoirs

“…(native to Brazil) and Hydrilla verticillata (L.f.) Royle (exotic to Brazil). The genera Egeria and Hydrilla (Hydrocharitaceae) have been the focus of concern in Brazilian reservoirs due to their large biomass (Bianchini Júnior et al, 2010) leading to an increase in the amount of decomposed material, which may cause the decrease in oxygen concentration (Rose and Crumpton, 1996), alteration of redox potential (Van der Putten et al, 1997), increased rates of fouling (Rooth et al, 2003), changes in biogeochemical cycles, reduction of plant diversity (Meyerson et al, 2000), increased primary productivity (Jordan et al, 1990) and changes in trophic relationships (Batzer, 1998) available in these reservoirs.…”