Environmental Science Flashcards
Demand that your teachers teach you what you need to know to build it.
Peter Kropotkin
systematic study of our environment and our proper place on it
Environmental Science
Population Dynamics Objectives
- appreciate the potential of exponential growth
- describe environmental resistance
- define fecundity, fertility, birth rates, life expectancy, death rates, and survivorship
a group of organisms of the same species which live in a particular area and have the capability of interbreeding
Population
Examples of Population
African elephants
Salmon
What determines whether a population will increase or decrease abruptly or whether it will maintain a delicate balance with its neighbors?
Ex: Wolves and Moose in Isle Royal
Dynamics of Population Growth
- growth at a constant rate of increase per unit of time
* rate of population increase under ideal conditions
Exponential Growth
Exponential Growth Model Equation
G=rN
G
Growth rate of the population
N
Population size
r
the average contribution of each individual to population growth
Per capita rate of increase
Each cow moose reaches sexual maturity at
Age 3 or 4
She (Cow moose) reproduces ___________each year for the next ___________if she remains healthy, has enough to eat, and survives that long
1-3 calves
8-10 years
Each female moose can produce as many as ____________ during her lifetime
Thirty (30) calves
if half of the calves are female, and all survive to have as many offspring as their mother, the moose population will increase four to tenfold in each ten-year generation
Population is increasing at 14 to 35 percent annual growth rate
is the maximum rate at which a given population can increase under ideal environmental condition
(Growth)
Biotic Potential
Many predator (decrease of growth)
opposite of biotic potential
the factors that limit the population growth
Environmental Resistance
Female housefly
Musca domestica
ach female fly lays an average _________ in each generation
120 eggs
The eggs hatch and mature into sexually active adults and lay their own eggs in
56 days
In 1 year (7 generations) , if all offspring survived long enough to reproduce, a single female could be the ancestor of
5.6 trillion flies
the number of individual that can be supported with the natural resource limit to a given area and without putting at risk the natural, social, cultural and economic environment for the present and future agencies that live in the same area or habitat.
Carrying Capacity
The nest of red ants made out of mango leave
Showing Carrying capacity
•the carrying capacity of an area is not fixed; it is determined by the continuous ________________
Availability of resources
