Flashcards in Bio 5: Ecosystems and sustainability Deck (28):
A place where an organism lives
All of the organisms of one species that live in the same place at the same time and that can breed together.
All the populations of different species that live in the same place at the same time.
A group of organisms including biotic factors and abiotic factors and their interrelationships between them.
Role that a species plays in an ecosystem
Autotrophic organisms that convert light energy into chemical energy, which is then supplied to consumers
Living organisms that feed on other living organism
Level at which an organism feeds in a food chain
Pyramids of biomass
Areas of the bars are proportional to the dry mass of all the organisms at the trophic level
Pyramid of energy
Burning the organisms in a calorimeter and working out how much heat is released per gram.
Gross primary productivity
Rate at which plants convert light energy into chemical energy.
Net Primary Productivity
NPP= GPP - Respiration
Rate at which carbphydrates accumulate in the tissue of plants of an ecosystem.
Total amount of energy fixed by photosynthesis.
The directional change in a community over time
Secrete enzymes onto dead and waste material, they digest the material into small molecules, which are then absorbed into the organisms body.
Give fixed nitrogen, get carbon compounds
Anaerobic: reduce nitrogen gas to ammonium ions
Get energy from oxidising ammonium ions to nitrite
Or nitrite to nitrate
Only in well aerated soils
Nitrates back to N2
Anaerobic conditions: nitrate as source of oxygen, make N2 and N20
Maximum population size that can be maintained over a period of time in a particular habitat
factors that cause the population of something to stop growing any larger
Competition between individuals of the same species.
Competition between individuals of a different species
Cutting a tree close to the ground,once cuts several new shoots will grow from the surface, and these will grow into stems. These can then be cut again.
Cutting the trunk higher up, in order to stop deers from eating the new shoots
Felling an entire area. This destroys on a large scale. It reduces soil minerals and leaves it susceptible to erosion.
Maintenance of biodiversity, habitats and ecosystems