### people | population:

Human population
* All human populations possess language.
* Most human populations are victims of the voracious beast, humankind.
* are hard to get accurate numbers of the human population
  - in a growth phase
* can have profound effects on populations of wild animals
  - impose excessive stresses on aquatic ecosystems
* has many direct and indirect effects on other variables.
* have more genetic variability than one strain of hairless albino mice.
* impact the land through timbering, mining, farming, urbanization.
* is low and dispersed
  - still relatively low compared to developing nations
* tend to aggregate around soils where farming is largely successful
  - modify existing ecosystems for own purposes
* use resources in the environment in order to maintain and improve their existence.

Immigrant population
* have a different age structure.
* tend to have higher fertility than native populations.

### people | population:

Large population
* bring unbearable pecking order pressures on individual birds.
* build up in a short period of time
  - over time and then crash before building up again
* can build up unnoticed before plants begin to show visible symptoms
  - cause wilting and poor plant growth due to minor root pruning
  - kill or stunt seedlings
  - pollute the environment with their own wastes
  - run away from disease sources
  - severely defoliate or kill plants
* cause cupping and curling of the leaves and prevent head formation
  - leaves to brown and drop prematurely
  - the leaves to turn brown and drop from the plant
* develop during hot, dry weather.
* have a large gene pool, with lots of diversity between individuals.
* live both on the borders of and deep within important forests.
* raise the standard of living by providing a wide variety of goods and services.
* reduce plant vigor
  - the effect of mutations
* tend to have high mutation rates.

Mosquito population
* are also sensitive to the presence of standing water.
* vary according to temperature, rainfall, and wind.

Natural population
* are found only on a number of offshore islands of New Zealand
  - genetically variable in the same manner as lab populations
* have enormous excess fecundity.
* occur in a wide range of tropical climates.
* persist in several Sonoran watersheds.
* tend to oscillate in a stable or unstable fashion around the carrying capacity.

Northern population
* Some northern populations migrate long distances.
* rise and fall in cycles along with prey populations.

Pest population
* take time to build to damaging levels.
* vary considerably from one field to the next, even in adjoining fields.

Population control
* can reduce conflicts by making sure that every nation has adequate resources.
* form of arms control.
* is an attempt to limit the growth in numbers of a population
  - essential part of the solution to the long-term food problem
  - critical to the overall global environmental agenda
  - social control

Resident population
* includes military populations and persons living in institutions.
* is the population living in the United States.

Rural population
* Many rural populations suffer from poverty and hunger.
* face problems of diversity and of deep divides between haves and have-nots.
* seek food and work in urban areas where unimmunized populations concentrate.
* use water from drilled or shallow dug wells.