Ecosystems - Thomas County School District

Ecosystems - Thomas County School District

Ecosystems Ecosystem all the organisms in an area along with their environment (habitat) - includes biotic (living) and abiotic

(nonliving) factors Biotic factors: organism population (all org of one species) community (all species in the area)

Abiotic factors: temperature, water (rainfall), sunlight, oxygen levels, wind, soil

temperature and water (climate) - most important factors determining types of life an ecosystem can support

Biodiversity variety of organisms in an ecosystem Tropical rainforest most biodiverse land ecosystem

Coral reef most biodiverse aquatic ecosystem Succession Succession change in an ecosystem

Replacement of one type of community by another over a period of time Two types: 1. Primary occurs in a newly made habitat (EX: new volcanic island)

2. Secondary occurs in habitat that has been disturbed (EX: after forest fire or manmade change)

Succession (Cont) Communities involved in succession Pioneer community first species in habitat (EX: lichens, mosses)

Intermediate species follow pioneer Climax community final species to appear; will remain as long as ecosystem is stable EX: lichens grass shrubs pine trees

deciduous trees Biome Biome large region characterized by specific

kind of climate and certain kinds of plant and animal life Terrestrial biomes: tundra, taiga (coniferous forest), temperate (deciduous) forest, grassland

(prairie, savanna), desert, tropical rainforest Aquatic ecosystems: lakes and rivers, wetlands, estuaries, marine

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