Biological Communities. Reading: Smith and Smith, Chapters 21-23. Biological community - a group of populations of different species that exist in the same place and are, at least in principle, capable of interacting with each other.
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Reading: Smith and Smith, Chapters 21-23
Or, are they ad-hoc assemblages of species that just happen to be able to live together?
size of community-boundaries are sometimes arbitrary
diversity of species in a community
number of species in a community
Pattern of energy flow based on who eats whom
resistance of a community to change due to extinction or disturbance
Every community has some degree of disturbance, and most are part of a series of communities that replace one another due to the process of ecological succession
Example-pitcher plants, sp. are members of bog communities.
This is an ecotone
coastal forest and wetland at the Elkhorn Slough
Some species belong to more than one
Example-warblers migrate seasonally, moving from temperate forests and grasslands to subtropical forests
macrocystis sp. forms dense forests underwater
In communities dominated by buckthorn, the most conspicuous major food source for birds is an annoying, laxative berry. This spreads buckthorn to other sites
These communities are often zoned by temperature, with green and red algae growing at the cool edges, cyanobacteria in the middle, and hyperthermophile prokaryotes near the center.
The archaean, Sulfolobus sp. gains energy by oxidizing sulfur granules around hot springs, and thus lower the Ph.