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Community ecology
- 1. Community Ecology Chapter 54 Jeff Jewett American College of Sofia Version 1.0 May 20 th , 2010
- 12. Galapagos Finches http://www.galapagoscruises.be/darwins-finches.jpg These birds show character displacement due to resource partitioning.
- 14. Photo: Dr. Shannon Savage, 2007 Count the toads….
- 15. http://www.alaska-in-pictures.com/data/media/4/bald-eagle-face_850.jpg http://commons.wikimedia.org/wiki/File:Muso_di_cavallo_%28horse_head%29.jpg Predator? Prey? Look at the eyes! (Well, and that beak…)
- 19. Food Webs
- 21. Keystone Species – Seastars ( Pisaster ochraceus )
- 22. Keystone Species – Sea Otter
- 27. The steep hillsides show early stages of primary succession (little or no soil), but the low, flat places accumulate soil and support grasses/trees. (Yosemite National Park, CA.)
- 28. Secondary Succession Yosemite National Park, CA . After a wildfire, grasses and tree seedlings grow up to replace the burned forest.
- 29. Secondary Succession Yosemite National Park, CA . Later after a wildfire, shrubs and short trees grow up to replace the burned forest. A few gray snags of the old burned forest are still visible.
Editor's Notes
- bottom is a milk snake (not poisonous), top is coral snake (very poisonous)
- Parasites can affect reproduction, survival, density. Mechanical parasites (cloud forests epiphytes) Coral reefs usually occur in nutrient poor waters and must be shallow enough for sunlight to reach them. Contained between the cells of the coral polyp cylinder are single-celled green algae called dinoflagellates. The coral polyp and the dinoflagellates form a complex mutualistic relationship. The coral polyp sweeps organic material from the water and metabolizes this material forming carbon dioxide and nitrogenous wastes. The dinoflagellates use the carbon dioxide and nitrogenous wastes in photosynthesis to form oxygen and sugars that are in turn used by the coral polyps as well as the dinoflagellates in their metabolism, reforming the carbon dioxide and nitrogenous wastes. This cyclical exchange of nutrients, oxygen, and carbon dioxide is beneficial to both the coral polyps and the dinoflagellates, a mutualistic relationship. (www.nearctica.com)