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1.2 Interdependence

1.2 Interdependence . All species rely on many others for survival Symbiosis – The relationship between individuals of two different species over time. Types of Symbiosis. Commensalism – one organism benefits while the other is unaffected.

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1.2 Interdependence

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  1. 1.2 Interdependence • All species rely on many others for survival • Symbiosis – The relationship between individuals of two different species over time.

  2. Types of Symbiosis • Commensalism – one organism benefits while the other is unaffected. • Barnacles attach to a whale to move to other areas…the whale is unaffected.

  3. Mutualism – both species benefit • Cow birds sit on backs of cows and eat the bugs off them…the birds get food while the cows get cleaned.

  4. Parasitism – one organism benefits while the other is harmed. • Tapeworm attaches to the intestines of a human. The tapeworm gets nutrients from food in intestine, leaving little food for the human.

  5. Symbiotic relationships are examples of extreme interdependence. • Predator/Prey relationships are also a form of interdependence!! • E.g. Lynx and Hare

  6. Niches – role of an organism in an ecosystem • Interspecies competition – when two or more species need (compete for) the same resource. • This is one type of interaction between species where neither species benefits. • E.g. two species competing for the same food source will both have less food=starvation in the population.

  7. COMPETITION

  8. Interspecies competition puts limits in the size a certain population will be. • So How do so many species exist together in the same place?

  9. They all have specific NICHES!!! • What it eats, what eats it, its habitat, nesting site, range(how far does it roam), its effect on populations around it and its environment…

  10. Niches vary from population to population. • The niche a population occupies may change over time. • E.g. frog tadpole – aquatic environment • Adult Frog – aquatic AND terrestrial environment

  11. Resource Partitioning • Division of a resource among two or more coexisting species so that the niche of each species differs slightly.

  12. Homework • Page 19 Questions 1,2,3,4

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