Biology // Chapter 5 Exam // Schaal
Terms in this set (30)
How are populations described?
Geographic range, density and distribution, growth rate, age structure
the area inhabited by a population
Density and Distribution
Number of individuals per unit area and where they are spaced throughout that area
Rate of increase or decrease of a population
the number of M/F of each age in a population. We control this and to predict reproduction rates
Factors of Population Growth
birth rate, death rate, immigration, emigration
When does population growth stop?
When the birthrate and the death rate are the same and when immigrates equals emigration
the larger a population gets, the faster it grows; under ideal conditions with unlimited resources, this will occur
s shaped, when a populations growth slows then stops following a period of exponential growth
Why does logistic growth occur?
If immigration slows, diseases, if birthrate goes down
The maximum number of individuals of a particular species that a particular environment can support
Once this is achieved, limiting factors stabilize it
What is a limiting factor?
a factor that controls the growth of a population
Name the limiting factors that are dependent on population density
competition, predation, parasitism, disease
Name the limiting factors that are not dependent on population density
weather, natural disasters
What do limiting factors determine?
carrying capacity, ability to halt extinction and overpopulation
What are density dependent factors?
Limiting factors whose intensity is related to population density and can limit growth in natural populations. EX: comp, predation, parasitism, herbivory, stress from overcrowding
What are density independent limiting factors?
Affect all populations in similar ways, regardless of size and density EX: unusual weather, natural disasters
What is an exception to a density independent limiting factor?
When weather impacts certain populations more than a smaller one. (Moose example)
Exponential human population growth
as civilization advanced, life became easier, and the human population began to grow more rapidly. Birth rates went up and death rates went down.
If you are off by even 1, you are off by ______
What will the population be in 2050?
What should you always start your microscope on?
the lowest power
What is the correction factor?
Stage 2 of Demographic Transition Model
Death rate falls, birth rate is high
What is demographic transition?
a dramatic change from high birthrates and death rates to low birthrates and death rates
Stage 1 of Demographic Transition Model
Birth rate and death rate are equally high
Stage 3 of Demographic Transition Model
Birth rate and death rate are equally low
What patterns predict population changes?
Birth/death rates, age structure
Diluting makes the dilution factor
Equation from lab
# of cells x dilution factor x correction factor
OTHER SETS BY THIS CREATOR
Comp Gopo Hahn: Nigeria Vocabulary
Biology Semester 1 Final (Schaal)
Bio chapter 2