Ecosystems 6.5

Trophic level

The level at which an organism feeds in a food chain

Productivity

The rate of production of new biomass by producers

What turns nh4 to no2

Nitrosomonas

What turns no2 to no3

Nitrobacter

Leaching

Nitrates flow into rivers and streams

What does nitrogen fixation

Rhizobium bacteria, haber process, lightning

Where does rizobium live

Root nodules

What causes fossil fuels to form

Fossilisation of plants and animals

Climax community

The final stable community that exists after the process of succession has occurred

Deflected successiom

When succession is stopped or interfered with

Pioneer species

The species that begin the process of succession often colonising an area as the first living things there

Succession

Progressive change in a community of organisms over time