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Biodiversity & Conservation; Climate change

Biodiversity & Conservation; Climate change. Outline : Patterns and controls on diversity Species extinctions Overexploitation Habitat destruction fragmentation Introduced species Conservation and protected areas Climate change Readings: 26, 28 and 29.

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Biodiversity & Conservation; Climate change

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  1. Biodiversity & Conservation; Climate change Outline: Patterns and controls on diversity Species extinctions Overexploitation Habitat destruction fragmentation Introduced species Conservation and protected areas Climate change Readings: 26, 28 and 29

  2. Large-scale patterns of biological diversity

  3. invertebrates

  4. Geographic patterns in species richness

  5. Species richness correlates with climate

  6. Extinctions of Large Animals Recent extinctions have primarily affected large animals (which are more profitable prey for hunters) The timing of extinctions in different regions has coincided with the arrival of humans (note absence of extinctions in Africa)

  7. Carolina parakeet Caribbean monk sealMonachus tropicalis Yangtze dolphin

  8. Nile perch Deliberately introduced to Lake Victoria (east Africa) in the 1960s to provide food for local fishermen. Has caused the extinction of at least 200 species of fish that were endemic to the lake

  9. Hot spots of biodiversity: • high overall biodiversity (1500 or more endemic plant species) • significant impacts from human activities

  10. Minimum viable population Minimum dynamic area

  11. Bighorn sheep

  12. Global climate change

  13. The effects of global climate change have been most pronounced at the poles

  14. Effects of climate change

  15. Effects of climate change • Precipitation patterns will also change; some areas will get more precipitation, others less • Temperate countries may become more agriculturally productive; tropical countries will most likely become less productive • Food production may increase in developed countries but these already have an overabundance of food; in third world countries, food shortages will worsen

  16. Changes to zones where species can live The current distribution of Douglas fur (green), regions where Douglas fur is currently found but is predicted to be unable to grow by the end of the 21st century (red), and regions where Douglas fur cannot grow at present but is predicted to be able to grow by the end of the 21st century (blue).

  17. Dawn redwoodMetasequoia glyptostroboides During the most recent glacial cycle of cooling and warming, this species went extinct in most parts of the world because it could not disperse fast enough to keep up with shifting climate zones. In the 21st century, the rate of global warming is expected to be 50-100 times faster than at the end of the last ice age. Many species will be unable to relocate fast enough to avoid extinction without human assistance.

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