. Ecosystems and Human Well-Being: Biodiversity Synthesis . 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 va
. Ecosystems and Human Well-Being: Biodiversity Synthesis . 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
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