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Tracking Populations

Tracking Populations. Populations on a kelp holdfast. How did we study those populations? Brought kelp into lab Visually spotted them Pulled them off the kelp Sorted them into another container Measured abundance of each taxa Assessed species richness/eveness.

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Tracking Populations

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  1. Tracking Populations http://earthref.org/SCC

  2. Populations on a kelp holdfast • How did we study those populations? • Brought kelp into lab • Visually spotted them • Pulled them off the kelp • Sorted them into another container • Measured abundance of each taxa • Assessed species richness/eveness http://earthref.org/SCC

  3. What about more mobile species? • How do we study their populations? • Tag devices • Sensor Networks http://earthref.org/SCC

  4. Mark-Recapture Do you see all your friends in school everyday? When you see someone you’ve never seen before what does this make you think about the size of your school? The number of repeat encounters you have with friends each day is related to the size of your school. http://earthref.org/SCC

  5. Mark-Recapture • How many times you see the same person is related to how big your school population is. • Same goes for animal populations. • But you know what your friends look like. • Need to ID animals http://earthref.org/SCC

  6. Mark-Recapture • Each time you mark an animal and recapture it, this tells you something about the population size. • Fish Tagging Lab http://earthref.org/SCC

  7. More ways to study populations • Satellite Tagging & Tracking • Genetics • Photo ID Mark Recapture http://earthref.org/SCC

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