Population Basics
The number of organisms per unit area.
Population density
Fire, severe weather, and pollution are examples of this type of limiting factor.
Density-independent factor
Small size, short life span, and many offspring describe this strategy.
r-STRATEGY
Pre-reproductive, reproductive, post-reproductive
Biodiversity
The gradual, ongoing loss of species over time.
Background extinction
The pattern of spacing of individuals within a population.
Dispersion
Disease, competition, and parasites are examples of this type of limiting factor.
Density-dependent factor
Large size, long life span, few offspring, stable environment describe this strategy.
k-strategy
Variety of genes or inheritable characteristics within a population.
Genetic Diverstiy
A large percentage of species disappearing in a relatively short time.
Mass extinction
Individuals moving INTO a population.
immigration
When births are greater than deaths, what happens to a population?
It grows/increases
Study of human population size, density, distribution, movement, and birth/death rates.
Demography
Number of different species and their relative abundance in a community.
Species Diversity
Excessive use of a species that has economic value.
Overexploitation
A species may be unable to expand this because it cannot survive abiotic conditions in a new region.
Population Range
Growth rate is increasing at a rapid pace, with the population nearly doubling quickly.
Exponential growth
The birth rate of a population.
Natality
Variety of ecosystems in the biosphere and their biotic/abiotic interactions.
Eosystem Diversity
Breaking a habitat into smaller isolated pieces.
Habitat fragmentation
At 2.3 lemmings/m², about how many occur in 1,000 m²?
2,300 Lemmings
Maximum number of individuals an envirnoment can support long term
Carrying Capacity
Name the three age-structure groups.
Pre-reproductive, reproductive, post-reproductive
Give TWO benefits biodiversity provides.
Any two: stability, health, medicines, food, safe water, oxygen, other ecosystem services
Nonnative organisms that spread and harm native species.
Introduced/invasive species