Ecosystems and Human Well-Being Biodiversity Ecosystems and Human Well-Being: Biodiversity Synthesis ecosystemshumanw05kuma Year: 2005 Cultivated Systems: Areas in which at least 30 of the landscape is cultivated Source: Millennium Ecosystem Assessment Figure Decline in Trophic Level of Fisheries Catch since 1950 (CI 8) A trophic level of an organism is its position in a food chain. Levels are numbered according to how far particular organisms are along the chain from the primary producers (level 1), to herbivores (level 2), to predators (level 3), to carnivores or top carnivores (level
Ecosystems and Human Well-Being Biodiversity Ecosystems and Human Well-Being: Biodiversity Synthesis ecosystemshumanw05kuma Year: 2005 Cultivated Systems: Areas in which at least 30 of the landscape is cultivated Source: Millennium Ecosystem Assessment Figure Decline in Trophic Level of Fisheries Catch since 1950 (CI 8) A trophic level of an organism is its position in a food chain. Levels are numbered according to how far particular organisms are along the chain from the primary producers (level 1), to herbivores (level 2), to predators (level 3), to carnivores or top carnivores (level 4 or 5). Fish at higher trophic levels are typically of higher economic value. The decline in the trophic level harvested is largely a result of the overharvest of fish at higher trophic levels. Mean trophic level (^ \ â II A Al I mar ne Mean trophic level Mean trophic level u~ m Coastal North Atlantic Ocean 1950 1960 1970 1980 1990 2000 1950 1960 1970 1980 1990 2000 1950 1960 1970 1980 1990 2000 Source: Millennium Ecosystem Assessment b<£ Ecosystems and Human Well-being: Biodiversity Synthesis
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