Tag: Water

Landscape Patterns in Soil-Plant Water Relations and Primary Production in Tallgrass Prairie

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Author: Knapp, A. K.; Fahnestock, J. T.; Hamburg, S. P.; Statland, L. B.; Seastedt, T. R.; Schimel, D. S. Description: Landscape variation in soil water relations, leaf xylem pressure potential (°) and leaf-level net photosynthesis (A) in Andropogon gerardii, and net primary production (NPP) were evaluated during the 1989 and 1990 growing seasons in a northeast Kansas (USA) tallgrass prairie. Landscape patterns were assessed along transects that spanned upland and lowland topographic positions in an annually burned and a long-term unburned watershed. Landscape variability in volumetric soil water content (°)…

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The underestimated dynamics and impacts of water-based recreational activities on freshwater ecosystems

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Author: Venohr, Markus; Langhans, Simone D.; Peters, Oliver; Holker, Franz; Arlinghaus, Robert; Mitchell, Lewis; Wolter, Christian Description: Recreational activities on, in, and along freshwaters (e.g., boating, bathing, angling) positively contribute to human well-being but can also concurrently stress aquatic ecosystems. While outdoor recreation, aquatic ecosystems, and human well-being form coupled social-ecological systems, inherent fluxes and interactions between these have rarely been properly quantified. This paper synthesizes information on links between water-based recreational activities, effects on freshwater ecosystems integrity and recreational quality, and proposes a novel framework for assessment and integrated…

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Frog skin epithelium: electrolyte transport and chytridiomycosis

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Author: Campbell, C.R.; Voyles, J.; Cook, D.I.; Dinudom, A. Description: One unique physiological characteristic of frogs is that their main route for intake of water is across the skin. In these animals, the skin acts in concert with the kidney and urinary bladder to maintain electrolyte homeostasis. Water absorption across the skin is driven by the osmotic gradient that develops as a consequence of solute transport. Our recent study demonstrated that chytridiomycosis, an infection of amphibian skin by the fungal pathogen, Batrachochytrium dendrobatidis, inhibits epithelial Na(+) channels, attenuating Na(+) absorption…

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