Geography 2156B Lecture Notes - Lecture 4: Brown Tree Snake, Living Planet Index, Millennium Ecosystem Assessment
10 Feb 2020
School
Department
Course
Professor
Document Summary
Un millennium ecosystem assessment (most comprehensive survey every into the natural systems that sustain life on earth, expected extinction in next 100 yrs: 32% of fish; 12% of birds; 25% of mammals, extinction rate: At present: 1000x background rate ; near future: 10,000x background rate . Many uncertainties about past & present rates, but strong consensus that present acceleration has reached point of spasm". *youtube video: book the sixth extinction: there have been 5 known major mass extinction in the. Brown tree snake, brought from new guinea to guam, multiplied like crazy; killed off many birds. *ocean acidification is global warmings evil twin : tropical species have a small range to adapt to climate change (this affects their life span & population) *theory: there are slow changes, but major mass extinctions do happen & were living in it right now: panama: disease that affects reptiles, now in contravention center & cannot go outside to study this disease & prevent it.
