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April14-post - Lecture 40 April 14 Conserving Earths...

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1 Lecture 40: April 14 Conserving Earth’s Biodiversity What is biodiversity? - genetic, species & ecosystem levels How many species are being lost and why? - estimating extinction rates - current threats: habitat destruction/fragmentation, climate change, invasive species, disruption of species interactions, eutrophication & pollution, overexploitation Why should we care? What can we do about declining biodiversity? Chapter 55: 1265-1281 Discussion Activity this week - none Essay #2 Due April 15 to your GSI Biodiversity can be analyzed at three levels: Genetic diversity: the total genetic information contained within all individuals of a species, measured as the number and relative frequency of all alleles present in a species Species diversity: the variety of life forms on Earth, measured as the number and relative frequency of species in a particular region Ecosystem diversity: the variety of biotic communities in a region, along with abiotic components such as soil, water, and nutrients
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