Presentation on theme: "Community Interactions Three types of interactions –Competition –Predation –Symbiosis Mutalism Parasitism Commensalism."— Presentation transcript:
Community Interactions Three types of interactions –Competition –Predation –Symbiosis Mutalism Parasitism Commensalism
Competition- competing for resources occurs due to a limited number of resources Resource- any necessity of life. water, nutrients, light, food. Competitive exclusion principle- no two species can occupy the same niche in the same habitat at the same time
Predation Predation- when an organism captures and feeds on another organism. Predator- hunter Prey- hunted
Symbiosis Symbiosis- any relationship where two species live closely together. (3 types) –Mutualism –Commensalism –Parasitism
Symbiosis - Mutualism Mutualism- both species benefit from a relationship. Lichens (fungus and Algae) One example is the lichens, little non-descript patches of stuff you see growing on rocks and tree bark. This is a symbiosis, consisting of a fungus and an alga. The fungus provides a protective home for the algae, and gathers mineral nutrients from rainwater and from dissolving the rock underneath. The alga gathers energy from the sun. There are thousands of species of lichen in the world; actually thousands of species of fungi with just a few species of algae which can form a partnership with almost any of them.
Symbiosis - Mutualism Mutualism- both species benefit from a relationship. Mychorrizae (plant and fungus) One example is the mychorrizae – the fungus embeds itself in the roots of the plant and provides additional Surface area for absorption of nutrients. In return, the plant provides a place for the fungus to live as well as Sugars from photosynthesis that are stored in the roots.
Symbiosis - Commensalism Commensalism – One member of a symbiotic relationship benefits and the other is neither helped or harmed Ex. Holes used by bluebirds in a tree were chiseled out by woodpeckers after it has been abandoned.
Symbiosis - Parasitism Parasitism- One creature benefits and one creature is harmed Ex tapeworm. Feeds in a humans intestines absorbing his/her nutrients.
Relationships:Symbiosis = Living Together a) commensalism b) mutualism c) parasitism