Freshwater Biome, Estuaries, Nitrogen Cycle

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Presentation transcript:

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 Cycle 1. 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 in atmosphere animals denitrifying bacteria nitrifying ammonium ammonification decomposers plant nitrogen-fixing bacteria in soil bacteria 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 in atmosphere animals denitrifying bacteria nitrifying ammonium ammonification decomposers plant nitrogen-fixing bacteria in soil bacteria in roots nitrates nitrites

Nitrogen is excreted by animals in the form of urine or feces Nitrogen Fixation:Nitrogen is taken from the atmosphere and fixed as nitrates by bacteria 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 Nitrogen Cycle Nitrates are absorbed by plants from the soil and used to build proteins Plants are eaten by consumers and nitrogen is taken up

Eutrophication http://www.youtube.com/watch?v=6LAT1gLMPu4 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