ENV100Y5 Lecture Notes - Lecture 31: Forest Ecology, Habitat Destruction, Invasive Species
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ENV100Y5 Full Course Notes
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Document Summary
Continuation of session 30: conservation of species & habitats (done on session 31: november 23) continuing from slide 61. Only 50 years left" for fish stocks (science: oct 2006) loss of biodiversity is driving collapse of fisheries. Forests are home to 90% of terrestrial species. 80% of world"s forests are degraded or destroyed. Agriculture: losses of - billion annually. Implicated in global decline of songbirds, ground nesting birds, turtles, bats. 26 fold increase in amount of agricultural pesticide use in last 50 years. Chemicals used 1,000"s of km away enter arctic food chains. Depauperate communities are at high risk for disease biodiversity hot spots often correspond to areas of high density and great poverty. Stores 67 billion tonnes of carbon = 303 years of carbonemissions, carbon bank account = . 1 trillion. Creating incentives and sharing costs of conservation. Settled ~400 a. d. , peak ~1500 a. d. , sudden collapse, complete deforestation of island. Forest ecosystems cover 30% of earth"s land surface.
