Graphics Library >> In Dead Water - Climate Change, Pollution, Over-harvest, and Invasive Species in the World's Fishing Grounds

Collection: In Dead Water - Climate Change, Pollution, Over-harv ...

In Dead Water - Climate Change, Pollution, Over-harvest, and Invasive Species in the World
In Dead Water - Climate Change, Pollution, Over-harvest, and Invasive Species in the World's Fishing Grounds
UNEP rapid response assessment on the state of the world's seas. In this report, the locations of the most productive fishing grounds in the World – from shallow, coastal waters to the deep and high seas- are compared to projected scenarios of climate change, ocean acidification, coral bleaching, intensity of fisheries, land-based pollution ...
Available online at: http://www.grida.no/publications/rr/in-dead-water
Sites with dead zones (oxygen depletion on the sea bottom)
Dead zones (hypoxic i.e. oxygen deficient water) in the coastal zones are increasing, typically surrounding major industrial and agricultural centers. This is commonly occuring due to nutrient pollution, in the form of n...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Deep waters within and beyond areas of national jurisdiction in East Africa
The figure demonstrates that the overwhelming majority of marine areas under national jurisdiction in East Africa are deeper than 200 metres (dark blue). Areas in red indicate where the geology/geomorphology might justif...
01 Feb 2008 - by UNEP-WCMC and UNEP/GRID-Arendal
Estimated contributions to sea-level rise (1993-2003)
The two main reasons for sea-level rise are thermal expansion of ocean waters as they warm, and increase in the ocean mass, principally from land-based sources of ice (glaciers and ice caps, and the ice sheets of Greenla...
01 Oct 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Cumulative impacts on the marine environment
Climate change may, through effects on ocean currents, elevated sea temperatures, coral bleaching, shifts in marine life, ocean acidification and much more severely exacerbate the combined actions of accelerating coastal...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Ratio of wastewater treatment
Sewage treatment is low or absent in many parts of the World, leading to eutrophication of the coastal zone, (toxic) algae blooms and dramatically reduce the ability of coral to recover from bleaching events dramatically...
01 Nov 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Human impact in the coastal zones
Infrastructure development, intensive agricultural expansion, urbanisation and coastal development are increasing the flow of sediments and sewage into the ocean. The situation is most severe around Europe, the East coas...
01 Nov 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Plankton distribution changes, due to climate changes - North Sea
With melting sea ice and warming of the oceans, marine species change their distributions, affecting entire food chains and ocean productivity. In 2005 the subtropical dinoflagellate Ceratium hexacanthum was found in CPR...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Coastal regions with observations of dense shelf water flushing
Knowledge and mapping of these processes is still scarce due to uneven research effort. The map shows sites with known dense shelf water cascading phenomena, which often may involve the 'flushing' effect. It is most like...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
World fisheries hotspots, 2004
The World’s most productive fishing grounds are confined to major hotspots, less than 10% of the World oceans. The maps shows annual catch (tonnes per km2) for the World’s oceans. Notice the strong geographic concurrence...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
depth
About depth
29 Nov 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
scenario
About scenario
29 Nov 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Distribution of coldwater and tropical coral reefs
Coral reefs are marine ridges or mounds, which have formed over millennia as a result of the deposition of calcium carbonate by living organisms, predominantly corals, but also a rich diversity of other organisms such as...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
canyondsw
About canyondsw
29 Nov 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
stocks
About stocks
29 Nov 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Trends in natural disasters
With growing population and infrastructures the world’s exposure to natural hazards is inevitably increasing. This is particularly true as the strongest population growth is located in coastal areas (with greater exposur...
29 Nov 2007 - by Emmanuelle Bournay, UNEP/GRID-Arendal
Climate change and tropical coral reefs, scenarios for bleaching events
Projected areas of above normal sea temperature where coral bleaching is likely to occur for the SRES A2 scenario (continuing current trends) by two different models, the PCM (1.7°C increase in 100 years) and the HadCM3 ...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Acidification due to climate change - impacts for oceans and coral reefs
As carbon concentrations in the atmosphere increase from land use changes and emissions from fossil fuels - so do concentrations in the ocean, with resultant acidification as a natural chemical process. The skeletons of ...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Atmospheric concentrations of carbon dioxide (CO2) - Mauna Loa or Keeling curve
Atmospheric concentration of CO2 is steadily rising, and oceans directly assimilate CO2. As ocean concentration of CO2 increases, the oceans automatically become more acidic. This, in turn, may have severe impacts on co...
01 Nov 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
shelfwater
About shelfwater
29 Nov 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Major pathways and origins of invasive species infestations in the marine environment
All across the planet, the number and severity of outbreaks and infestations of invasive species (i.e. species purposefully or accidentally introduced in non-native environments) is growing, and invasions of marine habit...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
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