Fundamentals of Ecology Class Meetings
March 2013 Th.wk.10 & wk. 11

Population Ecology - 2 Species Systems...

SPECIES INTERACTIONS!

Announcements:

• Extra credit opportunities:
• EC film tonight, "The real dirt on farmer Brown" 6-8:30 pm, Jones 140
• Talk next Tues (3/26) Tim Seastedt "Remaking the Rockies" 7pm, chem 130
• Summer job opportunities on Bio. Website
• Article in this week's Herald on snowpack (our own Dr. Steltzer!):    http://durangoherald.com/article/20130319/NEWS01/130319502/0/FRONTPAGE/Year’s-snowpack-looking-weak

Week 11 Homework:

• GUEST SPEAKER on Tuesday, so other assignments shifted forward
• BUT read excerpts from Christina Eisenberg's book, The Wolf's Tooth - library e-book (p. 1-41 & 73-75) -- for TUES.
• For Thursday,  read ONE of the four articles on predator-prey interactions in the Greater Yellowstone Ecosystem (in O: drive, "Yellowstone Readings" folder)
• Answer the general questions associated with these articles (Word Doc in O: drive folder, OR on Homework page)
• Bring a copy of the paper to class to aid in discussion
• Bring 2 copies of your question responses to class, one to turn in.
• Jigsaw work in class - you need to be your group's expert on the article you read.  If you haven't read it, you can't participate in the jigsaw, & won't earn those points.
• Additional in-class activities will be turned in at end of class - be here & ready!

Goals:

• Species Interactions (2-species systems)
  • types of interactions - worksheet
  • specific examples

• Species Interactions (2-species systems)
  • types of interactions

Species Interactions Worksheet:

• Fill in name (or names)/category of interaction

• Give 1 example

•  Examples of Interactions:

  • Competition

    • the competitive exclusion principle

    • resource partitioning

      • Robert MacArthur (1958) - warblers

      • Joseph Connell (1961) - barnacles

       

  • Predation

    • direct & indirect effects

    • trophic cascades:

      • keystone species

      • top-down vs. bottom-up control

      • Lynx-Hare interactions

      • Yellowstone Wolf-Elk interactions: Ripple & Beschta article

       

• See Powerpoint Presentation on Dr. Dott's O: drive

Chthamalus Balanus

Cape May Warbler