Slide 1

Group 6: Evolution (aka team Roadkill) Kirsten Deane-Coe, Jocelyne Dolce, Thomas Fox, Jan Janecka, Kristina Jones, Brady Porter Hard data to swallow: an interrupted case study

Slide 2

Teachable Tidbit Learning Objectives Interpret scientific data and draw conclusions Predict the response of a population to selection Describe adaptation to change in environment Background Information Teachable Unit Learning Goals See selection as an ongoing, visible, and relevant process Understand how selection works Resolve misconceptions about selection Intended Course: Introductory Biology for majors or non-majors Unit: Selection

Slide 3

American cliff swallow (Petrochelidon pyrrhonota)

Slide 4

Average life span: 5-8 y Aerial insectivores Agile flyers Build nests on cliffs, increasingly under bridges/overpasses Behavior: rest on ground, launch into flight for feeding / return to nests

Slide 5

Charles R. Brown and Mary B. Brown (2013) Current Biology

Slide 6

The figure drawn on the board depicts initial results from Brown & Brown (2013) on the number of road-killed swallows found over a 30 year period Turn to your neighbor, and take 2 minutes to: 1)Interpret the data shown 2)Develop at least one hypothesis that would explain this trend

Slide 7

Brown & Brown 2013

Slide 8

Slide 9

In your group, take a minute to discuss what, if anything, this histogram tells us Brown & Brown 2013

Slide 10

1) Copy and label the following set of axes onto the back of the concept map handout: Time, years Wing length of living birds 19832012 2) Draw your prediction of wing length of live birds over time if wing length is under selection

Slide 11

Average wing length of live swallows (mm) Brown & Brown 2013

Slide 12

Final activity / homework: revisit concept map Revisit the concept map the class created last week (handout). The Brown & Brown (2013) study published in Current Biology is provided for your reference. Work with your partner to match the terms on p1 of the the Cliff Swallow Case Study to the concepts in the map.

Slide 13

Variation in trait Selection pressure Differences in survival/reproduction Heritability of trait Response to selection Adaptation Concept map: evolution by natural selection A E B C F

Slide 14

Group 6: Evolution (aka team Roadkill) Kirsten Deane-Coe, Jocelyne Dolce, Thomas Fox, Jan Janecka, Kristina Jones, Brady Porter Teachable Tidbit Learning Objectives: Interpret scientific data and draw conclusions Describe adaptation to environmental change Predict the response of a population to selection