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Nitrogen fluxes from the landscape are controlled by net anthropogenic nitrogen inputs and by climate
The flux of nitrogen (N) to coastal marine ecosystems is strongly correlated with the ânet anthropogenic nitrogen inputsâ (NANI) to the landscape across 154 watersheds, ranging in size from 16 km2 to 279 000 km2, in the US and Europe. When NANI values are greater than 1070 kg N kmâ2 yrâ1, an average of 25% of the NANI is exported from those watersheds in rivers. Our analysis suggests a possible threshold at lower NANI levels, with a smaller fraction exported when NANI values are below 1070 kg N kmâ2 yrâ1. Synthetic fertilizer is the largest component of NANI in many watersheds, but other inputs also contribute substantially to the N fluxes; in some regions, atmospheric deposition of N is the major component. The flux of N to coastal areas is controlled in part by climate, and a higher percentage of NANI is exported in rivers, from watersheds that have higher freshwater discharge
(Re)visions of Sex : A Companion to the Third Biennial of International Photo-based art
This anthology, presented on the occasion of the third Fotofeis biennal, contains eighteen texts (in styles ranging from poetic, critical, theoritical and fictional) which address the festival's central theme: sex. Subjects such as pornography, voyeurism, homosexuality, erotica, fetishism and desire are considered whitin the contexts of ethics, aesthetics, semiotics, psychoanalysis and digital culture. Brief biographical notes on authors. 52 bibl.ref