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The allometry of bee tongue lengths - ESA2014

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The allometry of bee tongue lengths - ESA2014

  1. 1. The allometry of bee tongue length and its uses in ecology Ignasi Bartomeus Dan Cariveau Geetha Nayak Joe Zientek Rachael Winfree @ibartomeus nacho.bartomeus@gmail.com
  2. 2. Tongue length is linked to: -Extinction risk (Beisjmier et al. 2006, Bommarco et al 2013)
  3. 3. Tongue length is linked to: -Extinction risk (Beisjmier et al. 2006, Bommarco et al 2013) -Plant-pollinator network linkage rules (Santamaría and Rodriguez-Gironés 2008)
  4. 4. Tongue length is linked to: -Extinction risk (Beisjmier et al. 2006, Bommarco et al 2013) -Plant-pollinator network linkage rules (Santamaría and Rodriguez-Gironés 2008) -Foraging efficiency (Harder 1886, Balfour et al 2013) -Pollination efficiency (Rundolf et al In prep)
  5. 5. Tongue length is linked to: -Extinction risk (Beisjmier et al. 2006, Bommarco et al 2013) -Plant-pollinator network linkage rules (Santamaría and Rodriguez-Gironés 2008) -Foraging efficiency (Harder 1886, Balfour et al 2013) -Pollination efficiency (Rundolf et al In prep) -Co-evolutionary processes (Borrell 2005)
  6. 6. Tongue length is linked to: -Extinction risk (Beisjmier et al. 2006, Bommarco et al 2013) -Plant-pollinator network linkage rules (Santamaría and Rodriguez-Gironés 2008) -Foraging efficiency (Harder 1886, Balfour et al 2013) -Pollination efficiency (Rundolf et al In prep) -Co-evolutionary processes (Borrell 2005) -Breeding of crops to increase honey bee visitation (Hawkins 1969)
  7. 7. Single species: (e.g.Aizen et al 2008) Bombus dahlbomii Bombus terrestris
  8. 8. Single species: Community ecology: ... (e.g.Aizen et al 2008)
  9. 9. phylogeny Colletes Amegilla Megachile Augchlora
  10. 10. allometry Julian Huxley (1936) log-body mass log-metabolicrate
  11. 11. body mass speciestrait species trait = a*body massb (slope in log-log!) proportionality coefficient scaling exponent allometry
  12. 12. Joe Zientek Let’s measure tongues, then! Geetha Nayak
  13. 13. Thorax 795 specimens 108 species 27 genus 5 families Glossa head
  14. 14. Thorax 795 specimens 108 species 27 genus 5 families Glossa head Cane 1987
  15. 15. Analysis: Tongue length = (a+Family)*body sizeb
  16. 16. Analysis: Tongue length = (a+Family)*body sizeb -Tested IT and head width independently as size measure. -Tested non linearities on this variables. -Tested each term importance. -Tested for both intercept and slope changes - Best model selected using AIC comparisons
  17. 17. Best model include both IT + Family Apidae log - log- Tongue length = (a+Family)*ITb
  18. 18. Megachilidae Best model include both IT + Family log - log-
  19. 19. Halictidae Best model include both IT + Family log - log-
  20. 20. Colletidae Best model include both IT + Family log - log-
  21. 21. Andrenidae Best model include both IT + Family R2 = 0.90 log - log-
  22. 22. Allometry can be calculated on dry body size
  23. 23. Bombus A tool for community ecology Apidae
  24. 24. Maybe the interest is in the residuals?
  25. 25. Is short and long tongue families a good proxy?
  26. 26. Is short and long tongue families a good proxy? R2 < 0.10
  27. 27. What about intra-specific relationships? Tongue length = (a+Sex)*ITb
  28. 28. What about intra-specific relationships? Genus_species n R^2 Bombus griseocollis 67 0.411 Bombus bimaculatus 54 0.536 Xylocopa virginica 40 0.009 (ns) Ceratina ssp. 34 0.649 Colletes inaequalis 33 0.155 Habropoda laboriosa 32 0.195 Bombus impatiens 29 0.768 Halictus ligatus 29 0.345 Megachile mendica 28 0.689 Melissodes denticulata 24 0.421 Hoplitis pilosifrons 23 0.792 Augochlora pura 21 0.259 Lasioglossum versatum 19 0.080 (ns) Bombus perplexus 17 0.580 Agapostemon virescens 16 0.221 Interesting to understand why variation in tongue length and body size is decoupled at the individual level 6 out of 15 species R2>0.5 (Peat et al. 2005)
  29. 29. @ibartomeus nacho.bartomeus@gmail.com www.bartomeuslab.com https://github.com/ibartomeus/BeeIT Want to use the equation (R code): Want to know more on how to measure tongues? Talk with Joe at his Poster (227) Friday morning. Thanks! There will be a pollination Bee happy hour (17:30) at DeVere's Irish Pub located at 1521 L St. Join us!

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