01:119:115 Lecture Notes - Lecture 28: Extinction Vortex, Effective Population Size, Ecotone
31 Jan 2017
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Document Summary
Scientists have named and described 1. 8 million species. Estimates 10-100 million species exist on earth. Humans are rapidly pushing many species toward extinction. Conservation biology seeks to preserve life, integrating several fields to preserve biological diversity: types of biodiversity. Biodiversity has 3 main levels of diversity. Genetic diversity comprises genetic variation within a population and between. Endangered species is in danger of becoming extinct . A threatened species is likely to become endangered soon. Local extinction = extirpation - loss in one area. Ex: more than 50% of wetlands in the us have been drained and converted to other ecosystems: benefits of biodiversity. Extirpation of one species can have a negative impact on other species in an ecosystem. Flying foxes are key pollinators and seed dispersers in the pacific islands. Ecosystem services ways natural ecosystems & species help sustain human life.
