Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Community Ecology
Document related concepts
Unified neutral theory of biodiversity wikipedia , lookup
Habitat conservation wikipedia , lookup
Molecular ecology wikipedia , lookup
Overexploitation wikipedia , lookup
Storage effect wikipedia , lookup
Biodiversity action plan wikipedia , lookup
Introduced species wikipedia , lookup
Occupancy–abundance relationship wikipedia , lookup
Latitudinal gradients in species diversity wikipedia , lookup
Island restoration wikipedia , lookup
Ecological fitting wikipedia , lookup
Transcript
Community Ecology • A community is • Multiple populations (different species) • Share same general area/space • Interacting • Differ in their species richness • number of species • abundance of different species. Ecological Niche • Every population has a specific role (unique) • Niche • What it does • How it does it • Utilization of necessary resources • Abiotic & biotic Competition for resources • Limiting factors • 2 different species cannot share same need for • 1 will out compete. Why? • competitive exclusion principle • Each species will have unique niche » Resource partitioning Community Interactions: competition, predation, mutualism and commensalism Predation +/- • Predator eats prey • Herbivores eat plants • Omnivores eat both • Parasitism • Parasite depends on a host • Lice • Tapeworms • Harmful bacteria • Athletes foot • Mistletoe • Will a successful parasite kill their host quickly or slowly? • Mutualism +/+ • Aicatia tree & ants • Commensalism +/0 • Barnacles attached to a whale. Trophic structure • The feeding relationships • Transfer of food energy • food chain • Typically 4-5 links • Source • Producer • Consumers (1-3) • Part of niche • Food webs. • What transforms food chains into food webs? • More realistic trophic structure • Any species may be at more than one trophic level. • Birds Dominant species and keystone species • Dominant species • highest number or biomass • Producers • Keystone species • Regulator • Stabilize community • Typically a predator • keystone species removal • Alters community structure • What affect would this have on the rest of the community?
