Studied by 2 people
Looks like no one added any tags here yet for you.
what is a population?
organisms of the same species living in an area
what is geographic distribution?
area where individuals live
what is density?
number of individuals per unit of area
how do we calculate density?
number of individuals/the size of the area
what is the growth rate?
how the number of individuals in a population increases or decreases over time
what is population growth?
how the number of individuals changes over time
what three factors effect population size?
number of births, number of deaths, number of individuals entering or leaving the population
why would an organism immigrate/emigrate?
food or water, better living conditions, mating purposes
what are the two types of growth?
exponential and logistic
exponential growth occurs when…
resources are unlimited, no limits on growth, and reproduction is at a constant rate
exponential growth has what shape of the curve?
J-shaped curve
logistic growth occurs when…
resources become less available, the growth of the population slows down or stops, reaches it’s carrying capacity
logistic growth has what shape of the curve?
S-shaped curve
what is carrying capacity?
the maximum number of individuals that the resources can support
how can the carrying capacity change?
due to environmental changes
factors that limit the growth of populations are referred to as…
density-dependent factors and density-independent factors
what are density-dependent factors?
factors that become limiting when the density of the population reaches a certain level
what are some examples of density-dependent factors?
competition, predation, parasitism, disease
what are density-independent factors?
factors that affect all populations in the same way, regardless of population size
what are some examples of density-independent factors?
weather, natural disasters, seasonal cycles, human activities
Note 
Flashcard (130)