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Population Ecology. Population Dynamics ______________________: all the individuals of a species that live together in an area ______________________:

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Presentation on theme: "Population Ecology. Population Dynamics ______________________: all the individuals of a species that live together in an area ______________________:"— Presentation transcript:

1 Population Ecology

2 Population Dynamics ______________________: all the individuals of a species that live together in an area ______________________: the statistical study of populations, make predictions about how a population will change Growth Rate: ________________________________________________ How many individuals are born vs. how many die Birth rate (b) death rate (d) = ______________________________

3 Three Key Features of Populations 1. Size: ____________________________

4 PRE- REPRODUCTIVE REPRODUCTIVE POST- REPRODUCTIVE

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6 Human Population Growth

7 Three Key Features of Populations 2. Density: measurement of population per unit area or unit volume _____________________________________________________

8 1. ______________________- movement of individuals into a population 2. ______________________- movement of individuals out of a population 4 Factors that affect density

9 3. ____________________________________ Biotic factors in the environment that have an increasing effect as population size increases Ex. disease competition parasites 4. ____________________________________ Abiotic factors in the environment that affect populations regardless of their density Ex. temperature storms habitat destruction drought 4 Factors that affect density

10 Three Key Features of Populations 3. Dispersion:describes their spacing relative to each other _______________

11 factors that affect population growth ____________________ any biotic or abiotic factor that restricts the existence of organisms in a specific environment. –EX.- Amount of water, Amount of food, Temperature –__________________ the maximum population size that can be supported by the available resources, _______________________________________________ _______________________________________________

12 Carrying Capacity NumberNumber Time

13 2 Life History Patterns __________________ short life span small body size _________________ have many young _________________ Ex: cockroaches, weeds, bacteria

14 2 Life History Patterns ________________ long life span __________________ reproduce slowly __________________ provides parental care Ex: humans, elephants

15 __________________________ can be classified into three general types –Type I, Type II, and Type III I II III 50 100 0 1 10 100 1,000 Percentage of maximum life span Number of survivors (log scale)

16 Succession- ________________________________________ in which new populations of organisms gradually replace existing ones

17 Primary succession- New bare rock comes from 2 sources: –1. ___________________________________ –2. ___________________________________

18 Rock

19 ____________________________ ________________________________________ –Ex: lichens are the first to colonize lava rocks

20 ____________________________ ________________________________________

21 Secondary succession- sequence of community changes that takes place when _______________________ ________________________________________ ________________________________________

22 Secondary succession- A fire levels portions of a forest A farmer plows his field

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24 Pond Succession

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