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Coastal erosion (EU) and fragile ecosystems in the Mediterranean Coastal erosion (EU) and fragile ecosystems in the Mediterranean
Among the many impacts erosion has on coastal ecosystems are the destruction of soil surface layers, leading to groundwater pollution and to reduction of water resources; degradation of dunes, leading to desertification; reduction of biological diversity; adverse effects on beach dynamics; reduction of sedimentary resources; and disappearance of the sandy littoral lanes that protect agricultural land from the intrusion of seawater, resulting in ...
19 Nov 2013 - by GRID-Arendal
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Human impacts on marine ecosystems Human impacts on marine ecosystems
Harmonizing traditional economic activity and ecosystem-dependent economic values is a challenge we must address, especially for our coasts and oceans. Persistent environmental pressures, including pollution, overharvesting of fisheries, and habitat conversion are driven by growing populations and the growing economic output these populations demand. These pressures have led to dramatic declines in the ecological state of our coasts and oceans. W...
15 Oct 2013 - by GRID-Arendal
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Indications of structural changes in the marine ecosystem, catch ratios of predatory and plankton feeding fish Indications of structural changes in the marine ecosystem, catch ratios of predatory and plankton feeding fish
Three-quarters of fish stocks are currently exploited to the maximum extent, if not excessively. The Northeast Atlantic Ocean continues to exhibit declining catches, as well as a shift towards fish at lower levels in the food chain. This graphic illustrates the decline in the catch ratios of predatory and plankton-feeding fish in the Northeast Atlantic Ocean from 1950 to 1995.
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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Species Turnover Species Turnover
Change in the initial species richness in 2005 relative to 2001-2005 average (high-range climate change scenario). Studies predict species invasion will be profound in the Arctic and Southern Oceans. Among others these changes could result in a significant turnover of species of more than 60% of present biodiversity. This has the potential to disrupt a range of marine ecosystem services including food provisioning.
06 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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