Lecture 46-Endangered Species

Lecture 46-Endangered Species - Lecture 46 Endangered...

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Lecture 46- Endangered Species Orcinus orca - the Killer Whale -Occur in large oceans, good predators, significance to 1 st Nations people -Occur worldwide in the oceans, but show considerable variations in behaviour -Two forms of killer whales: Resident- eat salmon; use a lot of eco-location to eat Transient- eat marine mammals, whales, sea otter; hardly produce eco-location clicks Endangered Species Act (ESA) -1973, signed into law by Nixon -“Species” are protected; not hybrids Convention for International Trade in Endangered Species (CITES) -Purpose to minimize international trade of endangered species International Union for the Conservation of Nature (ICUN) -Gives us criteria about what is endangered, objective guidelines -There has been a world-wide decline in populations of amphibians (frogs, toads, salamanders, cicillians): habitat split is a key feature -Frogs breed in water, but spend life in woodlogs. Due to habitat split, frogs can’t get to and from environments -As the wealth of a city increases, the number of people living in urban areas increases -There has been a steady increase in urban populations, which essentially divorces people from nature -The spread of Vancouver threatens the Western water shrew; it will be wiped our completely in 10
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Lecture 46-Endangered Species - Lecture 46 Endangered...

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