Community Interactions. Community group of different populations living in the same ecosystem....
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Transcript of Community Interactions. Community group of different populations living in the same ecosystem....
Community group of different populations
living in the same ecosystem. includes all of the living things in an
ecosystem.
Mutualism
both organisms will benefit (are helped) from the relationship.
Examples:- Flowers and pollinators - Oxpecker and hippo- humans and gut bacteria
(+, +)
Commensalism one organism gets a
benefit (is helped) and
one organism gets no benefit AND is not
harmed (no effect)
Examples:- clownfish and anemone- Cattle egret and buffalo- Barnacle and whale- Sharks and remora
(+, 0)
Parasitism
one organism will benefit AND
one organism is harmed
Parasite lives in or on the host
Examples:- Humans and tapeworms- Snails and parasitic worm
(+, - )
Organism A Organism B
Mutualism
Commensalism
Parasitism
Draw a ‘+’ if the organism benefits. Draw a ‘–’ if the organism is harmedDraw a ‘0’ if the organism does not benefit AND is not harmed
+
–
0
+
+
+
Predator - Prey
Predation: when one organism kills and eats another
Predator – kills and eats other organisms
• Prey – gets eaten by predators
http://www.youtube.com/watch?v=0NcJ_63z-mA
Predators rely on prey for food and energy.
Predators eat the weakest prey members and it makes the prey population stronger overall.
When population of prey rises, predator population increases after.
When population of prey falls, predator population decreases after.
NicheA niche describes an organism’s way of life
and role in an ecosystem. Includes the biological (biotic) and
physical (abiotic) conditions needed to live
Biotic / Biological conditionsPlace in food webWhat it eatshow it gets its foodwhen, where, how it reproduces
Abiotic / Physical conditionsWhere it livesClimate it prefersBiome its found inAmount of water it needs
Fundamental Niche
full range of conditions an organism can live in
Realized Niche
niche that a species ACTUALLY occupies
Smaller than fundamental niche due to competition
Competitive Exclusion PrincipleNo two species can occupy the same exact
niche in the same habitat.
They will compete and one will win (survive) and one will lose (die).