Biology Spring 2008 #2

Biology Spring 2008 #2 - Biodiversity I Patterns in...

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Biodiversity I Patterns in biodiversity Values and losses of biodiversity How to measure biodiversity (bring calculator) Ecosystem characteristics: natural selection results in adaptations to abiotic factors… Another nutrient cycle imbalance: GLOBAL CARBON CYCLE Nutrients cycle between biotic sinks and abiotic reservoirs Large changes in the nutrient cycle balance negatively affect ecosystem health 75% emissions from burning fossil fuels 25% emissions from land use: deforestation Ecosystem function depends on the organism connections Example: food web Loses in diversity indicate a less healthy system. Biotic Characteristics Biodiversity: how diverse the organisms are Categorizing the health of ecosystem requires quantifying Three Levels of Biodiversity Genetic diversity of a species in 1 place. Examining a population Species diversity within a particular ecosystem. Examines a community Regional diversity: diversity of ecosystems. Examine a region Who qualifies to be a species? Biological Species Concept (John Ray in 1700’s)
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Biology Spring 2008 #2 - Biodiversity I Patterns in...

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