Ecosystems Chapter 15. 1. The organisms in the photo below represent: a. a population b. a community...
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Transcript of Ecosystems Chapter 15. 1. The organisms in the photo below represent: a. a population b. a community...
2. Name one density dependent limiting factor.
3. Name one density independent limiting factor.
4. In a certain habitat that you have been studying for years you notice that the population of deer always seems to stabilize around 50 individuals. This would be the ______________ for that population in that environment.
Biological MagnificationBiological Magnification– Increase in concentration of toxins in tissues
of organisms as they move up the food chain
Ex: DDT
Fig. 47-11, p. 848
atmosphere
wind-driven water vapor 40,000
precipitation onto land 111,000
evaporation from land plants (transpiration)
71,000evaporation from
ocean 425,000precipitation into
ocean 385,000
surface and groundwater flow 40,000
ocean land
Water CycleWater Cycle
Categories of Species Categories of Species InteractionsInteractions
SymbiontsSpecies that spend most or all of their
life cycle in close association with each other
Ex:Predation (Parasitism)Commensalism mutualism
Categories of Species Categories of Species InteractionsInteractions
Commensalism (+/0) benefits one species and does not affect the other
Mutualism (+/+) benefits both species
Interspecific competition (-/-) hurts both species
Categories of Species Categories of Species InteractionsInteractions
Predation (+/-) and parasitism (+/-) help one species at another’s expense
ParasitesLive on or in a host and usually do not kill it