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Tag: Coral

Climate change vulnerability in Africa
Multiple stresses make most of Africa highly vulnerable to environmental changes, and climate change is likely to increase this vulnerability. This graphic shows which of the regions of Africa (North Africa, West Africa,...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Species diversity in the world's seas
The graphic compares the amount of diversity of marine mammals, sharks, molluscs, birds, shrimp and lobsters in various sea regions. Coral reefs are among the most productive and diverse of all natural ecosystems. Recent...
28 Sep 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Coral reefs at risk from human activities
Population growth and technology: operating together these two factors account for the major causes of coral reef decline - excessive domestic and agricultural waste pouring into ocean waters, poor land-use practices tha...
28 Sep 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Estimated value of marine biomes
An estimation of the financial value of selected different marine areas. Marine biomes are divided between coral reefs, estuaries, and oceans. The marine biome covers 75% of the earth's surface, and accounts for 90% of t...
28 Sep 2005 - by Philippe Rekacewicz, 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
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
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
Tropical sea temperature rises and coral reefs - climate change scenarios
The impacts of coral reefs from rising sea temperatures. When coral reefs become heat-exposed they die, leaving the white dead coral, also known as bleaching. With even moderate pollution, the coral are easily overgrown ...
01 Feb 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Distribution of coral, mangrove and seagrass diversity
Similar to corals, the region of greatest mangrove diversity is in Southeast Asia, particularly around the Indonesian Archipelago (Burke et al., 2001). There are three distinct areas of seagrass diversity in the Pacific ...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Threats to the World's coral reefs
Major observed threats to the world's coral reefs include tourism, poison fishing, overexploitation, sedimentation, coral harvesting, dynamite fishing and pollution. This graphic explains which activities or conditions a...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Coastal issues in the islands of Comoros and Mayotte
With poverty and high population density this group of volcanic islands between Eastern Africa and Madagascar faces challenges in the management of the coastal environment. The islands are fringed by magnificent coral re...
23 Feb 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
Climate change vulnerability in Africa
Multiple stresses make most of Africa highly vulnerable to environmental changes, and climate change is likely to increase this vulnerability. This graphic shows which of the regions of Africa (North Africa, West Africa,...
17 May 2005 - by Delphine Digout, Revised by Hugo Ahlenius, UNEP/GRID-Arendal
Climate change vulnerability in Africa
Multiple stresses make most of Africa highly vulnerable to environmental changes, and climate change is likely to increase this vulnerability. This graphic shows which of the regions of Africa (North Africa, West Africa,...
20 Sep 2005 - by Delphine Digout, Revised by Hugo Ahlenius, UNEP/GRID-Arendal
Coldwater coral reefs, distribution
Scientists are just beginning to learn about the many species in the remote, deep waters of the polar oceans. Corals, for example, are not limited to the warm, shallow waters of the tropics. They also exist in many cold,...
31 Jul 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Distribution of coral, mangrove and seagrass diversity
Similar to corals, the region of greatest mangrove diversity is in Southeast Asia, particularly around the Indonesian Archipelago (Burke et al., 2001). There are three distinct areas of seagrass diversity in the Pacific ...
21 May 2010 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Coral Reefs
Distribution of the world's coral reefs. Oceans blue carbon sinks, along with coral reefs and kelp communities, all fulfil very important functions in the coastal zone while providing opportunities for jobs and coastal p...
21 May 2010 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Coldwater coral reefs, distribution
Scientists are just beginning to learn about the many species in the remote, deep waters of the polar oceans. Corals, for example, are not limited to the warm, shallow waters of the tropics. They also exist in many cold,...
21 May 2010 - by Hugo Ahlenius, UNEP/GRID-Arendal
Expected impacts of climate change in 2050
It is expected that by 2050 there will be threats to ecosystem services in the Andes and Mexico, in the Central American and Caribbean sub-regions, and in southeastern Brazil, while there will be negative effects on fish...
22 Nov 2010 - by Nieves López Izquierdo, Associate Consultant UNEP/GRID-Arendal
Threats to coral reefs in Eastern Africa
Human land use along coasts and in major river basins can threaten coral reefs through toxic material inputs to coastal ecosystems. This graphic shows the areas of low, medium and high estimated threats to coral reefs on...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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