Biogeochemical Cycles Mr. Skirbst Life Science Topic 19

Cycles

Daily Rhythms

Cycles Daily Rhythms diurnal – active at day

Cycles Daily Rhythms diurnal – active at day nocturnal – active at night

Cycles Lunar Rhythms

Cycles Lunar Rhythms tides – high / low monthly cycles

Cycles Annual Rhythms

Cycles Annual Rhythms seasonal changes

Cycles Annual Rhythms seasonal changes migration – annual movement from breeding to feeding grounds

Cycles Annual Rhythms seasonal changes hibernation – winter resting state (Latin: hibernus – “winter”)

Cycles Annual Rhythms seasonal changes estivation – summer resting state (Latin: aestivus – “summer”)

Cycles of Matter Flow of matter (chemicals) from non-living (abiotic) to living (biotic) parts of an ecosystem, and back again

Cycles of Matter Water Cycle: - evaporation (liquid to gas)

Cycles of Matter Water Cycle: - evaporation - condensation (gas to liquid) (cloud formation)

Cycles of Matter Water Cycle: - evaporation - condensation - precipitation (rain, snow, sleet, hail, fog)

Cycles of Matter Water Cycle: - evaporation - condensation - precipitation - infiltration / runoff (groundwater, streams, oceans)

Water Cycle

Cycles of Matter Oxygen – Carbon Cycle:

Cycles of Matter Oxygen – Carbon Cycle: - photosynthesis (producers: take CO 2  O 2 )

Cycles of Matter Oxygen – Carbon Cycle: - photosynthesis (producers: take CO 2  O 2 ) - respiration (consumers: take O 2  CO 2 )

Carbon – Oxygen Cycle

Cycles of Matter Nitrogen Cycle:

Cycles of Matter Nitrogen Cycle: - fixation: bacteria change “free” N from air to N- compounds in soil

Cycles of Matter Nitrogen Cycle: - metabolizing: N-compounds moved from soil to plants to animals

Cycles of Matter Nitrogen Cycle: - decomposition: bacteria “free” N back to air again

Nitrogen Cycle

Cycles of Change Ecological Succession: - gradual change from one community to another

Cycles of Change Ecological Succession: - gradual change from one community to another Climax Community:

Cycles of Change Ecological Succession: - gradual change from one community to another Climax Community: - a stable community of organisms

Cycles of Change Ecological Succession: