Wildlife Ecology Notes
Population Demography 13 Feb 2014 NRC 261
If we want to double a population of endangered piping plovers, what should we
concentrate on doing and how quickly should we expect results?
In order to reduce livestock and game losses, I want to significantly decrease the
number of leopards that live on a group of large ranches in southern Africa; how
often do I have to trap and how many do I have to catch?
Reproductive characteristics- finds out potential of regrowth
Population: a group of individuals of a species
-Sometimes easy to identify sometimes not so easy/
Meaningful – is it meaningful to discuss to talk about size, growth rates, density,
distribution and vital statistics.
Comparable-Population can be compared with other populations or in another
time its own population.
Isolated – largely reproductively isolated from other populations of same species
Robins- flock of robins is not a population
Snapping turtles- in campus pond is a population. They are reproductively isolated.
Mallard ducks- Maybe could because they are inbred ducks. But they do classify routes
as a population of species
Whooping Crane-Once upon a time the entire species was the population. Today, People
have started setting up new migration routes and many populations.
Population Dynamics - how and why populations change in numbers and
Brown bats- understanding how they live in different geographic areas helps population
dynamics. (all species)
Exponential population growth- Where species continually increase. Steep
population curve. No limit on food. Increasing at fast rates unlimited resources and no
mortality. But will lead to a crash. Over eat food supply.
Mule deer in Arizona- population grew from 5000-100,000 crashed down to
10,000. There was a point where they could not increase because limited resources
Caribou/island- 6000-42. Humans- On a exponential growth rate, so could crash or could find out how to
support ourselves with limited resources
Carrying capacity (K)- S shaped growth. Under normal circumstances logistic
growth occurs. Resources and area can only hold so much
Logistic population growth
-Amount of resources is limited
-Reproductive rates levels off
Cyclic population change- Cycling population growth rat