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Seabed habitats in Western Mediterranean Seabed habitats in Western Mediterranean
The Mediterranean Basin has a wide array of habitats that include sea grass beds, intact rocky shorelines, persistent frontal systems, estuaries, underwater canyons, deepwater coral assemblages and sea mounts (UNEP/MAP 2012).
19 Nov 2013 - by GRID-Arendal
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Composition of benthic communities Composition of benthic communities
Benthic communities are among the first to disappear under conditions of heavy stress. Benthic organisms play an important ecological role by reworking the sediments, which affects the flux of nutrients across the sediment-water interface. Thus their loss is a liability to the ecosystem as a whole. In undisturbed areas in the eastern Mediterranean, benthic communities have a high diversity of species, consisting of polychaetes (50–65%),molluscs...
19 Nov 2013 - by GRID-Arendal
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Non-indigenous species over the 20th Century Non-indigenous species over the 20th Century
Both the number and rate of non-indigenous introductions to the Mediterranean have been increasing in recent years (UNEP/ MAP 2009). Currently, about a thousand non-indigenous aquatic species have been identified in the Mediterranean Sea, with a new species being introduced roughly every ten days. About 500 of these species are well-established; many others are one-off observations (UNEP/MAP 2012). In addition, there are also terrestrial no...
19 Nov 2013 - by GRID-Arendal
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Comb jelly (Mnemiopsis leidyi) abundance variation in the Caspian Sea Comb jelly (Mnemiopsis leidyi) abundance variation in the Caspian Sea
One Comb jelly species has been introduced into the Caspian Sea – Mnemiopsis leidyi. The invasion of this jelly during the late 1990s represents one of the main environmental issues in this unique ecosystem, and is considered as one of the world’s major marine ecosystem invasive species occurrences.
17 Oct 2013 - by GRID-Arendal
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How the comb jelly (Mnemiopsis leidyi) is spreading in the European seas How the comb jelly (Mnemiopsis leidyi) is spreading in the European seas
One Comb jelly species has been introduced into the Caspian Sea – Mnemiopsis leidyi. The invasion of this jelly during the late 1990s represents one of the main environmental issues in this unique ecosystem, and is considered as one of the world’s major marine ecosystem invasive species occurrences.
17 Oct 2013 - by GRID-Arendal
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Production of nitrogen Production of nitrogen
The rapid increase in the production of reactive nitrogen via the Haber-Bosch process correlates closely with the increase in world population from about 2.6 billion in 1950 to over 6 billion in 2000 (figure page 78). Based on the figures from Dawson and Hilton (2011), over 2 billion tonnes of reactive nitrogen was manufactured in that period. The enormous increase in artificial fertilizer production catalyzed by the Haber-Bosch process has a...
16 Oct 2013 - by GRID-Arendal
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Long- term changes in the CHl-a levels in the Black Sea Long- term changes in the CHl-a levels in the Black Sea
Illustration in a set of graphics prepared for a pilot assessment report on the Black Sea drainage basin, for the UNEP Global Impact on Waters Assessment (GIWA). All data and information were prepared in close collaboration with the GIWA Black Sea team and the GIWA secretariat. The graphics were not used in this form in the final report on the Black Sea, published in 2005.
07 Nov 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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