GHY-1012 Lecture 2: Exam 2 lect 2 geo
16 Aug 2016
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Notes: humans are accelerating the natural extinction rates by 1000x, we are the astroid of the dinos, hippo - 5 major reasons why species go extinct, h - habitat destruction - #1 reason, i - invasive species. Exotic organisms thrive in new territory with no predators, diseases, or resource limitations. Over past 300 years approximately 50000 non-native species have become established in the us (ex kudzu, purple loosestrife, zebra mussels, chestnut blight, brown tree snake) Monday, march 21, 2016: the introduced species prey upon or compete better than the native populations. then the nature of the community can be altered - mongoose and rats in caribbean. Started with europeans: pollution - pesticides and lead - indirect and direct pollution, population - growth and resource use, overharvesting - poaching and over shing (passenger pigeon) - all major. Sh stocks expected to collapse within 50 yrs - bushmeat trade.
