BiogeochemicalCycles

Mr. SkirbstLife Science

Topic 19

Cycles

CyclesDaily Rhythms

CyclesDaily Rhythms

diurnal – active at day

CyclesDaily Rhythms

diurnal – active at daynocturnal – active at night

CyclesLunar Rhythms

Cycles

Lunar Rhythmstides – high / lowmonthly cycles

CyclesAnnual Rhythms

CyclesAnnual Rhythms

seasonal changes

CyclesAnnual Rhythms

seasonal changesmigration – annual

movement from breeding to feeding grounds

CyclesAnnual Rhythms

seasonal changeshibernation – winter

resting state(Latin: hibernus – “winter”)

CyclesAnnual Rhythms

seasonal changesestivation – summer

resting state(Latin: aestivus – “summer”)

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

Cycles of MatterWater Cycle:

- evaporation (liquid to gas)

Cycles of MatterWater Cycle:

- evaporation- condensation (gas to liquid)

(cloud formation)

Cycles of MatterWater Cycle:

- evaporation- condensation- precipitation (rain, snow, sleet, hail, fog)

Cycles of MatterWater Cycle:

- evaporation- condensation- precipitation- infiltration / runoff (groundwater, streams, oceans)

Water Cycle

Cycles of MatterOxygen – Carbon Cycle:

Cycles of MatterOxygen – Carbon Cycle:

- photosynthesis (producers: take CO2 O2)

Cycles of MatterOxygen – Carbon Cycle:

- photosynthesis (producers: take CO2 O2)

- respiration (consumers: take O2 CO2)

Carbon – Oxygen Cycle

Cycles of MatterNitrogen Cycle:

Cycles of MatterNitrogen Cycle:

- fixation: bacteria change “free” N from air to N-compounds in soil

Cycles of MatterNitrogen Cycle:

- metabolizing: N-compounds moved from soil to plants to animals

Cycles of MatterNitrogen Cycle:

- decomposition: bacteria “free” N back to air again

Nitrogen Cycle

Cycles of ChangeEcological Succession:

- gradual change from one community to another

Cycles of ChangeEcological Succession:

- gradual change from one community to another

Climax Community:

Cycles of ChangeEcological Succession:

- gradual change from one community to another

Climax Community:- a stable community of organisms

Cycles of ChangeEcological Succession: