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Organism
An individual living thing
Population
A group of organisms that belong to the same species and live in the same area
Community
Populations of living things in a particular area
Ecosystem
All the biotic and abiotic factors in an area
Biome
A group of ecosystems that share similar climates and typical organisms
Abiotic
Non-living things
Biotic
Living things
Food chain
A series of steps in which organisms transfer energy by eating and being eaten
Food web
A community of organisms where there are several connected food chains
Producer
An organism that can make its own food.
Consumer
Organisms that eats other organisms or organic matter
Decomposer (One type of detritivore)
Organisms that break down waste/dead organisms
Scavenger (Other type of detritivore)
Eats dead organisms
Apex predator
Top predator in an ecosystem
10% rule
10% of energy from an organism is transferred up the food chain
Biomagnification/Bioaccumulation
Accumulation of pollutants at higher levels of a food chain
Precipitation
The falling to earth of any form of water
Percolation
Water moving through soil and rock due to gravity.
Evaporation
Water changing into an atmospheric gas
Transpiration
Evaporation of water from plants
Absorption
Water taken in by a plant
Combustion
Burning something
Respiration
The release of carbon dioxide into the atmosphere by humans and animals; taking in oxygen too.
Carbon sink
Storage space for carbon Ex: fossil fuels, coal, etc
Nitrification
The process by which nitrites and nitrogen is produced by bacteria in the soil (nitrifying bacteria)
Nitrogen fixation
Process of converting nitrogen gas into ammonia
Dentrification
Conversion of nitrates into nitrogen gas (dentrifying bacteria)
Immigration
Migration to a new location
Emigration
Migration from a location
Type I
Low birth rate, low death rate until old age
K-strategist (follows Type I)
Reproduce late in life; few offspring; care for offspring
Type III
High birthrate, high death rate at early age
R-strategist (follows Type III)
Reproduce early in life; many small unprotected offspring: no care for offspring
Type II
Death rate is constant over organism's life span
Exponential growth (J shaped graph)
Amount of organisms grows exponentially over time. (unlimited resources)
Logistic growth (J and ~ shaped graph)
Amount of organisms grows exponentially until it hits carrying capacity. (limited resources)
Population dispersion
Way in which individuals of a population are spread out over an area or volume (Clumped, uniform, random)
Population density
Number of individuals per given area
Limiting factor
Any biotic or abiotic factor that cause a decrease in population growth.
Density dependent factors
Limiting factor that depends on population size
Density independent factors
Limiting factor that affects all populations in similar ways, regardless of population size
Green World Hypothesis
Herbivores consume relatively little plant mass because they are held in check by predators, parasites and disease.
Keystone species
A species that influences the survival of many other species in an ecosystem
Tropic cascade
A single species can affect the well-being of a whole environment