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These are the lecture slides of Ecology. Key important points are: Food Web Structure, Stability of Communities, Environmental Perturbation, Functioning of Community, Resilience of Communities, Alternative Stable States, Trophic Structure of Community
Typology: Slides
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Environmental perturbation can cause a delayed response in the functioning of a community
Suttle and Thomsen (Mary Power lab at UC Berkeley)
Spring watering:
Enhanced biomass, especially in the beginning
How about species richness?
Any extension of the rainy season resulting from climate change is likely to lead to a reduction of specie richness.
Remove of organisms in a New England rocky intertidal zone community resulted in replacement by one of several possible new community
Northern facing site dominated by barnacles
Southern facing site by algae
Replaced original ones and did not recover over five years
Trophic structure of a community may be
determined by bottom-up or top-down control
Cases for bottom-up, top- down control or both
Mathew Leibold, Uni. Of Chicago 1997, Survey
Remove or add herbivore will influence primary production
But consumer production is related to primary production
Leibold et al. 1997
Change in nutrient level can switch a marine
community between alternate state
Fish have indirect effects on the populations of several species in and around ponds
Knight et al. 2005, Nature
Compared ponds contain fish compared to ponds without fish
4 control (no fish) 4 treatment (within fish)
Another nice example to demonstrate the
indirect interactions