Populations. I. How Populations grow A. Describing populations 1. Geographic Range- Space where it...
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Transcript of Populations. I. How Populations grow A. Describing populations 1. Geographic Range- Space where it...
B. Population Growth-changes based onhow many individuals are added or removed
1. How?
a. Birthrate/death rate
b. immigration/emigration
D.Logistic growth-a growth pattern in which aPopulation’s growth rate slows down or stopsfollowing a period of exponential growth---graph shaped Like an S
E. Carrying Capacity1) the greatest number of individuals an
Environment can support2) the degree to which a population is
limited in size by its resources
II. Limits to Growth
A. Limiting Factors
Anything that causes the growthOf a population to decrease
Ex: food, predators
2. Density Independent Factors
Affects populations regardless of size
Ex: weather , natural disasters
2. Demographic Transition-
A change from high birth rates and death rates to low birthrates and death rates