Seasonal and long-term nutrient trend decomposition along a spatial gradient in the Neuse River watershed

Article Abstract:

The nutrient enrichment of the Neuse River Estuary in North Carolina is believed to have declined in recent years because of algal blooms, fish kills, and toxic microorganisms. Research taking a local regression analysis (STL) approach to seasonal trend decomposition analysis of long-term and seasonal trends in nutrient concentrations indicates that upstream, phosphorus concentrations have decreased markedly, but remain downstream. This has resulted in the nitrogen to phosphorus concentrations rising considerably. A comparison of the ambient nutrient rations with the Redfield value indicates that phytophankton growth may be changing from nitrogen to phosphorous limitation during the better part of the year. This, in turn, may be precipitating a change in the biotic community.

North Carolina, Water bloom, Algal blooms, Water, Water chemistry, Soils, Phosphorus (Chemical element), Soil phosphorus

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Accumulation of Triflouroacetate in seasonal wetlands in California

Article Abstract:

Triflouroacetate is a breakdown product of hydro- and hydrocloro-flourocarbons and certain polymers and pesticides. If water systems have little or no outflow, the possiblity exists that levels of triflouroacetate could become toxic. Results of the study involving vernal pools in Northern California suggest that toxicity increases as the level of triflouroacetate increases, thus endangering indigenous plant species.

United States, Science & research, California, Polymers: Plastic, Rubber, Fiber, Resin, Synthetic Rubber, and Artificial and Synthetic Fibers and Filaments Manufacturing, Pesticide and Other Agricultural Chemical Manufacturing, Pesticides & Other Ag Chemicals, Agricultural chemicals, not elsewhere classified, Plastics Materials and Synthetics, Polymers, Pollution, Chemical industry, Polymer industry, Pesticides industry, Northern California

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A size-based probabilistic assessment of PCB exposure from Lake Michigan fish consumption

Article Abstract:

Two Bayesian models demonstrate that very few individuals of the five species of fish from Lake Michigan could fall into the category in which their consumption is unrestricted because of their high polychlorinated biphenyls (PCBs) content. Five salmonid species were the subject of a fish consumption advisory that was issued by the state of Wisconsin. Results have revealed that brown trout have the highest PCB concentration among smaller fish. Lake trout, on the other hand, have the highest PCB concentration among larger fish.

Commercial Fishing, Fishing, Industrial Organic Chemicals, Polychlorinated Biphenyls, Cyclic Crude and Intermediate Manufacturing, Standards, Environmental aspects, Fishes, Wisconsin, Lake Michigan, Lake trout, Brown trout

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