Biology 3442F/G Lecture Notes - Lecture 9: Habitat Destruction, Overexploitation, Introduced Species

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Major causes of extinction: habitat loss and fragmentation, overharvesting (hunting, pollution. Iucn red list - lists the status of species throughout the world: habitat loss and fragmentation 80 , hunting/harvesting 30 40 % Introduced species 40 : pollution 10 % Only way to fix the underlying causes of an extinction is to properly diagnose the cause: proper diagnosis = science. Suggesting an improper cause will waste: limited funds for conservation, time of experts/officials involved, time that the species has left. Graeme caughley: conservation biologist from new zealand that studied herbivore-vegetation dynamics, termed the small population paradigm and declining population paradigm. Declining population paradigm vs. small population paradigm: declining, the cause of small populations. Small: effects of a small population on the persistence of the population. Medical" model: determine if the population is on a dangerous decline, more effective than looking at the population numbers (some species can persist in low numbers)

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