Reservoirs have altered the flow regime of most rivers on the globe. To simulate the natural flow regime, experimental floods are being implemented on regulated rivers throughout the world to improve their ecological integrity. As a large-scale disturbance, the long-term sequential use of floods provides an excellent empirical approach to examine ecosystem regime shifts in rivers. This study ev...

1.1 Summary of Activities We have completed a three-year investigation of land-atmospheric CO 2 exchange over Amazon Basin. During the project time span, we have implemented and evaluated a new version of ecophysiology model SiB that is capable of realistically representing seasonal drought in surface fluxes of carbon, energy, and water. Significant modifications have been made to the calculati...

Understanding the effects of major hydrogeological controls on hyporheic exchange and bank storage is essential for river water management, groundwater abstraction, restoration and ecosystem sustainability. Analytical models cannot adequately represent complex settings with, for example, transient boundary conditions, varying geom-5 etry of surface water–groundwater interface, unsaturated and o...

Effects of watershed and riparian zone characteristics on nutrient concentrations in the River Scheldt Basin J. Meynendonckx, G. Heuvelmans, B. Muys, and J. Feyen Ecosystem Management Group, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium Ecorem consultants nv, Kontichsesteenweg 38, 2630 Aartselaar, Belgium Department of Land Management and Economics, Faculty of Bioscience En...

A rapidly spreading Mountain Pine Beetle epidemic is killing lodgepole pine forest in the Rocky Mountains, causing landscape change on a massive scale. Approximately 1.5 million acres of lodgepoledominated forest is already dead or dying in Colorado, the infestation is still spreading rapidly, and it is expected that in excess of 90 percent of all lodgepole forest will ultimately be killed. Dro...

Black Sea receives 1,125,839 tons of organic matter, 575,000 tons mineral nitrogen, 55,000 tons mineral phosphorus, 30,000 tons organic phosphorus, 90,000 tons iron, 206,000 tons petroleum and petroleum products, 48,000 tons surfactant, 12,000 tons zinc, 67,000 tons manganese, 4,500 tons lead, 2,800 tons copper, 900 tons cadmium and 80 tons of mercury in a year from land based sources. All thes...

CHLORINE NUTRITION OF HIGHER PLANTS: PROGRESS AND PERSPECTIVES Wenrong Chen a; Zhenli L. He a; Xiao E. Yang b; Suren Mishra c;Peter J. Stoffella a a Indian River Research and Education Center, University of Florida, Institute of Food and Agricultural Sciences, Fort Pierce, Florida, USA b Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environme...

No further cases of rinderpest were recorded among Cape buffaloes (Syncerus caffer) in the Tsavo ecosystem after June 1995. There were, however, suspect but unconfirmed cases involving lesser kudu (Tragelaphus imberbis), bushbuck (T. scriptus) and giraffe (Giraffa camelopardalis) in the Meru area of Kenya in 1995. Serosurveillance showed that the epidemic had been more extensive than originally...

To control source pollution and improve water quality, an understanding of the spatiotemporal characteristics of organic contaminant concentrations in affected receiving waters is necessary. The Songhua River in northeast China is the country's third-largest domestic river and loadings of organic contaminants along an industrialized section have made it the focal point of a national pollution r...

Water resources availability for meeting reservoir storage, water supply diversion, and environmental instream flow requirements must be assessed based on various premises regarding future water uses as well as climatic and hydrological conditions. This study, therefore, investigates the possible association between climate change and water resources variability, and detects the plausible long-...