6. Origin of Species - Evolution and Speciation

6. Origin of Species - Evolution and Speciation - NEW YORK...

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NEW YORK TIMES. Aug 16, 2011. The Lake Erie watersnake, a harmless critter that can grow to more than three feet in length, has been removed from the federal list of endangered and threatened wildlife after a successful decade long effort to protect the snake and its habitat, the Interior Department announced this week. The watersnake ( Nerodia sipedon insularum ), found on the islands and shoreline of western Lake Erie in Ohio and Ontario, was on the verge of extinction because of intentional killing and a loss of habitat to development. Officials added it to the federal list of endangered species in 1999 and began a concerted effort to save it. ―Today the Lake Erie watersnake joins species such as the bald eagle, the American alligator and the peregrine falcon that have rebounded from the threat of extinction and no longer require the protection of the Endangered Species Act,‖ said Ken Salazar, the Interior secretary. ―These species –- and the hundreds of others whose extinction has been prevented by the act –- are living testimonies to its ability to bring species back from the brink by protecting them and conserving and restoring their habitat.‖ …. .
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Origin of Species Evolution and Speciation
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Evolution Biological evolution : changes in inherited traits (that have a genetic basis) over time Small-scale evolution: changes in traits in a population from one generation to the next Large-scale evolution: creation of multiple species from a common ancestor over many generations. Change in traits over a few generations Over many generations, evolution produces tremendous diversity in forms of life. Leaves on trees change color and fall over several weeks. Mountain ranges erode over millions of years.
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has changed over time — and that different species share common ancestors. Time
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6. Origin of Species - Evolution and Speciation - NEW YORK...

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