16S rRNA amplicon sequencing of bacterial communities from stormwater ponds in South Florida.

Stormwater ponds (SWPs) host distinct microbial communities. Here, we use 16S rRNA metabarcoding to characterize bacterial communities in four SWPs in South Florida, USA. A total of 37,002 amplicon sequence variants were identified, Cyanophyceae was the dominant class in pond A, while Gammaproteobacteria dominated the other ponds.

Intraspecific Variation in Crayfish Behaviour Alters Stream Ecosystem Functions.

Human-induced environmental changes are reshaping animal behavioural traits, yet their ecological consequences remain poorly understood. We demonstrate that among-population variation in the behavioural traits of two freshwater crayfish species profoundly affects key ecosystem functions in streams. Crayfish movement behaviour was strongly linked to increased water column metabolism in both natural streams and controlled mesocosm experiments.

Spatiotemporal diversity and community structure of cyanobacteria and associated bacteria in the large shallow subtropical Lake Okeechobee (Florida, United States).

Lake Okeechobee is a large eutrophic, shallow, subtropical lake in south Florida, United States. Due to decades of nutrient loading and phosphorus rich sediments, the lake is eutrophic and frequently experiences cyanobacterial harmful algal blooms (cyanoHABs). In the past, surveys of the phytoplankton community structure in the lake have been conducted by morphological studies, whereas molecular based studies have been seldom employed.

Calcification-driven CO emissions exceed "Blue Carbon" sequestration in a carbonate seagrass meadow.

Long-term “Blue Carbon” burial in seagrass meadows is complicated by other carbon and alkalinity exchanges that shape net carbon sequestration. We measured a suite of such processes, including denitrification, sulfur, and inorganic carbon cycling, and assessed their impact on air-water CO exchange in a typical seagrass meadow underlain by carbonate sediments. Eddy covariance measurements reveal a consistent source of CO to the atmosphere at an average rate of 610 ± 990 μmol m hour during our study and 700 ± 660 μmol m hour (6.

Wind induced algal migration manipulates sediment denitrification N-loss patterns in shallow Taihu Lake, China.

Driven by winds, the distribution of algae is often noticeably patchy at kilometer scales in shallow lakes. The decomposition of the settled algal biomass may affect nitrogen (N) biogeochemical cycles and thereby N loss in sediments. In this study, we investigated sediment denitrification N-loss patterns along algal migration pathway in Taihu Lake, a shallow and eutrophic lake in China, and found that wind-induced algal migration in the overlying water manipulated the temporal and spatial patterns of denitrification N-loss in sediments.

Variation in benthic metabolism and nitrogen cycling across clam aquaculture sites.

As bivalve aquaculture expands globally, an understanding of how it alters nitrogen is important to minimize impacts. This study investigated nitrogen cycling associated with clam aquaculture in the Sacca di Goro, Italy (Ruditapes philipinarum) and the Eastern Shore, USA (Mercenaria mercenaria). Ammonium and dissolved oxygen fluxes were positively correlated with clam biomass; R.