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M 4.28

M 4.28. PQ #14 Grading and schedule updates See Trees (5) Finish Competition Theory 10B reminder Do Wolves pt 2. American sycamore Platanus occidentalis. Silver maple Acer saccharinum. Shagbark hickory Carya ovata. Eastern redbud Cercis canadensis. Flowering dogwood Cornus florida.

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M 4.28

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  1. M 4.28 • PQ #14 • Grading and schedule updates • See Trees (5) • Finish Competition Theory • 10B reminder • Do Wolves pt 2

  2. American sycamorePlatanusoccidentalis

  3. Silver mapleAcer saccharinum

  4. Shagbark hickoryCaryaovata

  5. Eastern redbudCerciscanadensis

  6. Flowering dogwoodCornusflorida

  7. New grade cutoffs(not doing AA4/IDQ9, so -45 pts)

  8. Do for Monday: On Monday: Do for Friday: On Friday:

  9. So… • Most of what we consider “competition theory” is based on the relationship between current morphology and current niche. • Any problems with this assumption?

  10. So… • Most of what we consider “competition theory” is based on the relationship between current morphology and current niche. • Any problems with this assumption? • It’s easy to study morphology and more difficult to study niche/resource separation. But when we examine morphology alone, there is still clear separation.

  11. The Problem? • One explanation is that competition has selected for differences in the species. In other words, the species have become more specialized, and thus reduced overlap.

  12. Also,

  13. BUT… • Morphology is a result of the past. Organisms are not adapted to their present, they are adapted to the ancestors’ present. • Right??

  14. Morphology is the “ghost of competition past”

  15. Logistic Growth Equation ΔN = r * N * (K – N)/K • (K-N/K) = proportion of environment still available for habitation • Whole equation = “change in N is equal to population’s rate of increase multiplied by current population, multiplied by portion of environment still available.” • (So, as N approaches K, (1-N/K) approaches 0, and multiplication by 0 is 0.)

  16. Definitions (lab p. 226) N1 N2 r1 r2 K1 K2 • α • Β

  17. Definitions (lab p. 226) • N1 = size of pop 1 • N2 = size of pop 2 • r1= growth rate of pop 1 • r2= growth rate of pop 2 • K1 = carrying capacity for pop 1 • K2 = carrying capacity for pop 2 • α = competition coefficient for pop 1 • Β = competition coeffic1ent for pop 2

  18. Competition coefficient (α and β) • “per-capita effect” • Effect of one individual of one species on one of the other • Consider a herd of bison vs a colony of prairie dogs

  19. What happens when we add species 2? • The number of unoccupied spaces available to species 1 get taken up by species 2. • So, the number of open spaces is now K1 – N1 – αN2 • But, remember, prairie dogs vs bison! • α would be large (>0) if converting bison space to prairie dog space, but small (<0) if reversed.

  20. By substitution: • Original equation: ΔN = r * N * (K – N)/K • Substitute: ΔN1= r1* N1* (K1 – N1 – αN2)/K1 • Works both ways (use β for species 2 coefficient) • Do Lab CYPs p 221 – 232 for practice, due with plant lab (10B)

  21. Lotka-Volterra Models • When graphed together, the point at which the lines intersect show the separation between growth and decline (p 232 – 235).

  22. Lab 10B: Competition • Check pots – no more than HALF of the numbers listed in rows 3 and 5 (final #) for each pot. • We will continue to provided almost unlimited water. • Sometime on 5/5, 5/6, or 5/7, do steps 4-6. • Answer all CYPS and Q 1-5 on p 240.

  23. Wolves Pt 2 • Pro-con table to get you warmed up. • Pt 1 Q 4?

  24. Wolves Pt 2 Wolf #21 spent a little over two years with his mother (#9) before venturing out to become the alpha male of another pack. He fathered pups every year from 1998–2004, including 20 pups in 2000. #21 became a legend to “wolf-watchers,” not only because of his size, but also because of his calm and gentle spirit. He was often seen walking away from a kill he had just made so that he could urinate or take a nap. This would allow the younger wolves to take their fill. Alphas typically eat first and will defend their right against others. #21 also was seen playing with the young wolves and letting them climb on top of him, much like a human father might do when wrestling with his young sons. Rick McIntyre, a biological technician for the Yellowstone Wolf Project, describes #21 the following way: When pups harassed him by biting his tail or ears, #21 would often just walk away; I once saw him cross the road and hide in some bushes to get away from pups that were bothering him. Of course, he also used his great size and strength to benefit his pack. If the younger wolves were attacking an elk, but could not pull it down, #21 would run in and help bring it down (Smith et al. 2005). #21 died in 2004, which made him an exceptionally long-lived wild wolf. He definitely left a legacy. In 2001, his pack numbered thirty-seven, the largest known wolf pack in history. Many of his pups went on to either join other packs or start other packs.

  25. Parts 3/4 • DUE: Parts 1-3 M 5/5 • Part 4 for 10SP M 5/5

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