HomeAboutActivitiesMapsPhotosPublicationsNews
 
Home >> Vital Water Graphics >> Trends in marine and freshwater populations
File type Download Size Language
.jpg .jpg Download 38 kb -
Uploaded on Saturday 25 Feb 2012 by GRID-Arendal

Trends in marine and freshwater populations

Year: 2005
From collection: Vital Water Graphics
Author: Delphine Digout, UNEP/GRID-Arendal
Description:
The Marine Species Population Index provides an assessment of the average change over time in the populations of 217 species of marine mammals, birds, reptiles, and fish. The index represents the average value of six regional ocean indices. More pronounced declines are seen in the southern oceans, which is attributed to the fact that major losses and degradation of marine ecosystems in the industrialised world took place prior to 1970. Marine species are generally more difficult to monitor than terrestrial ones. Assessments are therefore based primarily on fishery catches, and the monitoring of land breeding species (e.g. turtles, birds and seals). However, these species are over-represented in the index, which should have a far greater proportion of invertebrate species.
Views: 337     Downloads: 109     Rating: 3
Benefits from marine and coastal ecosystems and activities
Water consumption - top countries
carbon_cycle
Causes of sea level rise from climate change
Water withdrawal and consumption
Renewable freshwater supplies, per river basin
Regulation of the Tigris and Euphrates rivers
Phosphate levels in major basins