Monday 4.14• DUE today: Only Bugs/Stream data• NOT DUE: Anything else• DUE next Monday: AA3Packet, Wbirds – details TBA• Schedule adjustments x 3• WUSTL seminar cancelled this week• All got 10 EP last week• Sign up for owl prowl!! 30 SP!!• Blackboard shutdown R, F: bio271.weebly.com

1. PQ #122. Grade distribution3. See Small Mammals4. Discussion on Slime Molds, Birds, Ch 135. Lab 10B: Plant competition

PQ #12

• On a sheet of paper, answer the following:1. What concept, idea, etc. from the assigned readings

(13.1, 13.2, wbirds thru #11, Lab 10, slime molds) was most unclear? (That is, what do you still have questions about, or what did you understand the least?)

2. What part(s) of this same concept, idea, etc., do you understand? (That is, which part(s) can you explain clearly or which make sense?)

3. With both of these responses in mind, what can or will you do to prepare for this concept, idea, etc. appearing on an exam?

700.00

720.00

740.00

760.00

780.00

800.00

820.00

840.00

860.00

880.00

900.00

Group 1:Exam: 76%PQ: 76.6%Total: 836.3 pts

Group 2:Exam: 66%PQ: 51.1%Total: 718.3 pts

Read. The. Book.

Small Mammals in Missouri

All images are from Wikimedia Commons, unless otherwise

identified

Eastern cottontailSylvilagus floridanus

Nine-banded armadilloDasypus novemcinctus

Eastern spotted skunkSpilogale putorius

Striped skunkMephitis mephitis

OpossumDidelphis virginiana

Gray foxUrocyon cinereoargenteus

American minkNeovison vison

Least weaselMustela nivalis

Eastern moleScalopus aquaticus

Southern short-tailed shrewBlarina carolinensis

Discussion: Slime Molds• PQ Questions• Slime Molds: Crespi paper

1. If cooperation represents the “core of sociality,” are microorganisms “social?”

2. What is altruism? Does it advance fitness? Inclusive fitness?

3. Hamilton’s rule: Help can be given if RgB – C > 01. If not?2. If Rg is low?3. If B is low?4. High incidence of high Rg in haplodiploid systems (many

bees and wasps)

Discussion: Wbirds

• #1: Hypothesis in an “If X happens, then we can expect to see Y.” Let X be the definition of your dependent variable. (hint: inter/intra)

• #6: Is color brightness important to other males, to females, or to both?

• #7: If X, then Y.• #9: similar to #6• #11: ??

Discussion: Ch 13

• Competition is essential for selection.• If resources are limiting, we expect some

individuals to be better at getting available resources than others.

• What happens to the individuals that are better at getting resources?

Ch 13: Competition• Operates at two levels:– Intraspecific competition.– Interspecific competition.

• Which do you think is more important?

Eco-?

• Once again, we can see that foundations of ecology have borrowed heavily from principles of economics

• Consider Burger King vs McDonalds.• Do they compete?– For what?– Are their “niches” the same?

Eco-?

• Once again, we can see that foundations of ecology have borrowed heavily from principles of business

• Consider Burger King vs McDonalds.• Do they compete?– For what?– Are their “niches” the same?

• Consider a third fast food restaurant

How to “win?” (at business or biology)

• “Find a need and fill it.”– Henry Kaiser, entrepreneur

• So, if you were going to open a fast food restaurant, what would you do?– Mimic a successful formula?– Try something different?

Classic competition experiment, Georgy Gause

• Two spp of Paramecium, grown separately,

Paramecium

• BUT, when grown together,

Competitive Exclusion principle

• “No two species can occupy the same niche at the same time.”

• Obvs, this only works if Resources Are Limited

• Next up, models (L-V) of how these principles overlap to predict dynamics. Stay tuned!

Lab 10B: Competition

• Start with HALF the number of seeds instructed for all pots and all treatments

• In one week from today (4.21), thin to max final # (rows 3 and 5 of table)