AS and A Level Biology Revision - Biology Innovation. Dead Zones. Dead Zones: Sucking the Life from the World’s Oceans By Marisa Bauxbaum The difference between hypoxic water (murky green) and well-oxygenated water (clear blue). Photo: Nancy Rabalais/Louisiana Universities Marine Consortium Understandably, recent environmental media coverage on the Gulf of Mexico has focused on the Deepwater Horizon oil spill of 2010. Further threatening the Gulf and other aquatic systems around the globe is a different, chronic affliction. Since the 1960s, both the incidence and severity of dead zones have increased in coastal and estuarine ecosystems. Motherjones.com How do humans influence the formation of dead zones?
The dead zones that result from nitrogen and phosphorus over-loading can be persistent, irregularly present, or occur at seasonal intervals – the Gulf produces a roughly 8,000-square mile swath of dead ocean every summer. Hypoxic areas are highlighted in color, with the most severe hypoxia shown in red. But the problem is international in scope. Discovery of DNA Double Helix: Watson and Crick | Learn Science at Scitable. Chargaff, E. Chemical specificity of nucleic acids and mechanism of their enzymatic degradation. Experientia 6, 201–209 (1950) Evolution_poster_lg.gif (GIF Image, 1400x758 pixels) - Scaled (72%)