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Context dependent interactions in ecology


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A PechaKucha teaching talk summarizing this synthesis on interactions: Chamberlain, S. A., Bronstein, J. L. and Rudgers, J. A. 2014. How context dependent are species interactions? - Ecology Letters 17: 881-890.

Additional source: Armas, C., Ordiales, R. and Pugnaire, F. 2004. Measuring plant interactions: a new comparative index. - Ecology 85: 2682-2686.

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Context dependent interactions in ecology

  1. 1. context-dependent interactions inspired by Chamberlain et al 2014 @cjlortie
  2. 2. context dependency in one of the most interesting & important elements of many ecological subdisciplines
  3. 3. context dependence = variation variation for interactions = magnitude & sign changes
  4. 4. magnitude of variation best captured by coefficient of variation (CV) CV = measures the amount of total variation with respect to the mean outcome
  5. 5. sign changes measure outcome ignoring magnitude positive (+) negative (-) neutral (0)
  6. 6. most powerful form of synthesis is arguably meta-analyses
  7. 7. effect size quantitative measure of strength of evidence or difference
  8. 8. Rii = relative interaction index [-1, +1] very useful effect size measure in ecology Armas 2004
  9. 9. Rii = (with - without)/(with + without) Armas 2004
  10. 10. the metric matters
  11. 11. Chamberlain et al 2014 247 studies interaction class context-dependency gradient location ecosystem
  12. 12. predation, competition, mutualism magnitude sign change
  13. 13. location: lab and greenhouse were the most variable in both magnitude and sign changes
  14. 14. variation in interactions by ecosystem depends on gradient, & interaction type but marine varied less than terrestrial or freshwater
  15. 15. mutualisms were most likely to change sign however the magnitude of variation between mutualisms & competition did not differ
  16. 16. spatial contexts: mutualisms change sign > competition temporal contexts: competition change sign > mutualisms
  17. 17. frequency & variation are powerful tools to model context in ecology
  18. 18. the mean outcome does not mean importance
  19. 19. competition, facilitation, and predation are separate classes of interactions but also interact within a system context is opportunity in ecology