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Chapter 26 (metapopulations (a region of the environment is composed of…

- - - - empty patches will become colonized by migration from occupied patches
        
        populations within individual patches have a probability of going extinct within that patch
- - - - dependent on prey density = prey- dependent
  - - - 1) particular prey individual will be encountered, rare species are consumed less often. 2) decision by predator to attack, is plant poisonous, spiny, worth it? 3) attacked prey item will be successfully eaten
    - - 1) predators should prefer whichever prey yields the most energy per unit of handling time. 2) if high-yield prey become sufficiently scarce, then predator would be more successful by lowering high energy diet to something easy to handle 3) some prey items will always be eaten if encountered, others will never be eaten even if easy to obtain. 4) plant will be eaten depends partially on the abundance of other plants that are easy to handle and have higher value
  - - - invasive = when a species increased population density while a competitor is present
      - resource = and substance factor that lead to increased growth rates as its availability is increased and that its consumed by an organism
        
        abiotic resources- light, water, minerals and space
        
        biotic resources - attention of pollinators, seed dispersers, and mycorrhizal fungi.