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Estimates of the sources and wet deposition fluxes of inorganic nutrients (PO3- 4, NO- 3, NO- 2, NH+ 4) have been made using a long-term wet atmospheric deposition measurement at three sites along the Mediterranean coast of Israel. The nutrient composition in rainwater indicated a dominant anthropogenic source for NO- 3 and NH+ 4 and a continental, natural, and anthropogenic, rock/soil source for P03- 4. The calculated longterm dissolved inorganic N (IN) and inorganic P (IP) fluxes were 0.28 and 0.009 g m-2 yr-1 to the coastal zone and estimated as 0.24 and 0.008 g m-2 yr-1 to the Southeast (SE) Mediterranean, with a possible increasing pattern of the annual dissolved IN fluxes. Concentration of total and seawater...
Most climate change research has focused on threats to native species, but non-native, invasive species may be impacted as well. We show that warmer temperatures and shifts from snowmelt runoff regimes to mixed runoff regimes in parts of the Northern Rocky Mountains, US, may reduce the occurrence of nonnative brook trout (Salvelinus fontinalis) and indirectly benefit the native cutthroat trout (Oncorhynchus clarkii). Differences in reproductive strategy may account for the differential responses of the two species. We base these findings on models of species occurrence that use landscape and climatic variables as predictors and are built from a database of >4000 fish collection points. We estimate changes in stream...
This study assesses the role of the atmospheric dry fallout as a source of new nitrogen and phosphorus to the surface Levantine seawater. Leaching experiments of inorganic nitrogen () and phosphorus (LIPO4), using SE Mediterranean surface seawater, were performed on 41 aerosol (hereafter dust) samples collected on Whatman 41 filters between April 1996 and January 1999 at Tel Shikmona, Israel and on four desert-event dust powder samples. A geometric mean of 2.8 and 3.2 mmol NO3 - and NH4 + per gram of dust was leached by seawater from normal (background) dry deposition captured by the filters. Significantly lower amounts of IN with lower NH4 +:NO3 - ratios were leached from both the filters and the dust powder sampled...