Phosphorus availability in the Parana flood plain lakes (Argentina): influence of pH and phosphate buffering by fluvial sediments

Article Abstract:

Phosphorus (P) availability in the Parana flood plain lakes of Argentina is discussed. Its influence of pH and phosphate buffering by fluvial sediments was studied in three geologically different rivers. Phosphate-buffering properties and P chemistry of suspended particulate matter (SPM) in three rivers are compared and distinctive P-buffering capacities were related to the chemical composition of SPM. Loading of fluvial sediments to the lakes and the acidic dissolving of calcium-bound P likely can explain the permanent excess of dissolved phosphate-P in the waters in question.

Canada, Argentina, Phosphates, Lakes, Watersheds, Floodplain ecology, Sediment transport

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A novel approach for estimating ecosystem production and respiration in estuaries: application to the oligohaline and mesohaline Hudson River

Article Abstract:

A novel approach for estimating ecosystem production and respiration in estuaries is discussed relative to its application to the oligohaline and mesohaline Hudson River. The study measured dissolved oxygen (DO) depth profiles over diel time periods in the two parts of the river along a transect from upper Haverstraw Bay to the George Washington Bridge to estimate net ecosystem production (NEP), (whole-ecosystem respiration) ER and gross primary production (GPP). The technique should avoid some of the biases that go with incubation of water in bottles.

Methods, Physiological aspects, Water, Light, Rivers, Water chemistry, Hudson River, Biological assay, Bioassay, Carbon cycle (Biogeochemistry), Carbon cycle, Dissolved oxygen

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Forms and availability of sediment phosphorus in cabonate sand of Bermuda seagrass beds

Article Abstract:

Phosphorus (P) is released to the pore water, becoming available for seagrass (Thalassia testudinum) roots, as the carbonate matrix of the sediment is dissolved in the rhizosphere, according to a study of three seagrass beds in Bermuda. The site with the highest anthropogenic influences was highest in P availability. The carbonate-bound P supply is sufficient to sustain the P requirements of seagreasses for decades, but the rate of release may not be fast enough to support maximum growth rates of seagrass.

Bermuda, Natural history, Seagrasses

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