freshwater biome, estuaries, nitrogen cycle. aquatic biomes freshwater marine estuaries
Post on 13-Dec-2015
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Freshwater Biome, Estuaries,
Nitrogen Cycle
Aquatic Biomes• Freshwater• Marine• Estuaries
Freshwater Biomes• Rivers, streams, lakes• Organisms: fish, frogs, algae• Often surrounded by a variety of
plants.
Estuaries• Area where fresh and salt water mix (where
rivers enter ocean)• Examples: lagoons, mangrove swamps• Many species of plants, fish, crabs, shrimp,
and birds live here.• “Nurseries of the Sea” – many species
reproduce or raise young in estuaries.
Nitrogen Cycle1. Nitrogen is removed from the atmosphere
through nitrogen fixation (bacteria convert nitrogen gas to nitrates)
2. Plants use nitrates to make proteins.3. Animals get
nitrogen by eating plants (or animals that ate plants)
nitrogen inatmosphere
animals
denitrifyingbacteria
nitrifyingbacteria
nitrifyingbacteria
ammonium
ammonification
decomposers
plant
nitrogen-fixingbacteria in soil
nitrogen-fixingbacteria in
roots
nitrates
nitrites
Nitrogen Cycle (cont.)4. Animal waste and dead plant/animal
matter are decomposed by bacteria, nitrogen is returned to the soil.
5. Bacteria return nitrogen to atmosphere through the process of denitrification.
nitrogen inatmosphere
animals
denitrifyingbacteria
nitrifyingbacteria
nitrifyingbacteria
ammonium
ammonification
decomposers
plant
nitrogen-fixingbacteria in soil
nitrogen-fixingbacteria in
roots
nitrates
nitrites
Nitrogen Cycle
Nitrogen Fixation:Nitrogen is taken from the atmosphere and fixed as nitrates by bacteria
Nitrates are absorbed by plants from the soil and used to build proteins
Plants are eaten by consumers and nitrogen is taken up
Nitrogen is excreted by animals in the form of urine or feces
Nitrogen from dead plants and animals is broken down by bacteria returning nitrogen to the soil
Denitrification: Nitrogen is returned to the atmosphere by bacteria
Eutrophication • Increase of phosphorus and nitrogen concentrations in bodies of water, usually from run off
• Causes algal blooms • Leads to lack of oxygen in body of water
http://www.youtube.com/watch?v=6LAT1gLMPu4
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