Biology Chapter 2.1

Organisms and Their Environment

2.1 Organisms and Their Environment

Ecology- study of organisms and their environment Biosphere – high in atmosphere to

bottom of ocean

Provided by the SeaWiFS Project, NASA/Goddard Space Flight Center and ORBIMAGE.

2.1 Organisms and Their Environment

Biotic Factors = Living

Abiotic Factors = Nonliving

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2.1 Organisms and Their Environment

Levels of Organization Individual Population Biological

community Ecosystem

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2.1 Organisms and Their Environment

Habitat – where an organism lives Can be changed by natural causes or

humans

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2.1 Organisms and Their Environment

Niche- a position a species has in its environment No two sp. Can exist in the same niche

in the same place at the same time One will gain control over resources The other must adapt, move elsewhere, or

go extinct.

y2u.co.uk/.../I_zq5/RN_Animal_Giraffe_1.jpg

2.1 Organisms and Their Environment

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2.1 Organisms and Their Environment

Survival Relationships Predator / Prey Relationship

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2.1 Organisms and Their Environment

Survival Relationships Symbiotic Relationships

Commensalism Remora/Shark Barnacles on whales

Mutualism Bacteria in lg intestines The Nile crocodile and the Egyptian plover N-Fixing Bacteria and plants

Parasitism Tapeworms Fleas, Lice Mistletoe

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