Determining Population Size Flashcards
What are the three methods used to determine population size
observation
sampling
mark/capture
Direct observation
observer is directly involved with population being studies
population is aware of the observer’s presence
Indirect observation
population is observed from a distance
population is unaware of observer presence
Sampling
number of members of one species in a specific area are counted
values are used to estimate the total population
Mark/recapture
samples of a specific population are captured, marked, and released
later samples use the ratio of marked/unmarked organisms to estimate population
Conservation biology
studies effect of humans on the environment and methods of conserving biological diversity
What are the factors affecting population growth
density-dependent factors
density-independent factors
Density-dependent factors
predation, disease, crowding, and stress
Density-independent factors
natural disasters, human impact, temperature, or organism behavior
Exponential growth show a …….. shaped growth curve
J
What type of species shows exponential growth
R-selected species
In exponential growth, population is multiplied by a value greater than …..
1
The higher the multiple of exponential growth, the ……. the growth curve
steeper
Logistic growth shows a …. shaped growth curve
S
What type of species show logistic growth
K-selected species
In logistic growth, population grows …….., then growth ……. as carrying capacity is reached
exponentially; slows
Logistic growth is ….. dependent
density
Population density
total number of organisms in region divided by land area in km squared or mi squared
What was the U.S. Census established by
U.S Constitution
The U.S Census performed once every
10 years since 1790
The U.S Census divded the country into
12 regions
