UCCS Biology 1200 Chapter 53
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UCCS Biology 1200 Chapter 53
UCCS Biology 1200
Bio 1200 lecture notes
What are abiotic factors of dispersion?
environmental factors like temperature
What are biotic factors of dispersion?
What are the patterns of distribution in reference to dispersion?
Abundance is affected by:
Natality and Morality
Immigration and Emigration
Density is affected by:
Availability of resources
Fecundity and Morality
Demographics are the quantifiable statistics of a given population
The number of individuals in a population that survive per unit of time
What is Type I Survivorship?
Higher survivorship of young and middle aged individuals
What is Type II Survivorship?
Equal survivorship among all age groups
What is Type III Survivorship?
Higher Survivorship of middle and older aged individuals
What is the net reproductive rate (R0)?
The average number of offspring produced by an individual
What is generation time (T)?
Average time from egg to egg
What is the geometric rate of increase ()?
The ratio of population size two points in time
What is the per capita rate of increase (r)?
Birth Rate - The Death Rate
-if negative, population is declining
-if 0, population is stable
-if positive, population is growing
What are the two types of growth of a population?
Exponential growth represents:
The growth of a population under ideal conditions
A J-Shaped curve on a population graph indicates what kind of population growth?
Logistic growth represents:
Population growth when resources are limited
An S-Shape curve on a population graph indicates which kind of growth?
How does Logistic growth happen?
Population growth starts fast but then levels off and approaches zero at K
What is a Maximum sustainable yield (MSY)?
The largest catch/yield that can be taken from a stock while remaining a stable population size
Define Age Structure:
Number of individuals of each age in the population
What is the doubling time for human beings?
When did the human population peak and at what % ?
1962 at 2.2%
What is the current growth rate of humans?
What is the growth rate predicted to be in 2050?
Which kind of countries account for the highest rates of growth?
Less developed countries
Which countries account for greater rates of resource consumption and waste production?
More developed countries
Define life history:
reproductive characteristics of a population
What are the aspects of life history?
Age of reproductive maturity
Frequency of reproduction
Number of offspring
Life history strategies involve trade offs because resources are limited. What are some examples?
Egg/seed size and number
Frequency of reproduction (semelparity or iteroparity)
Semelparity and iteroparity refer to:
the reproductive strategy of an organism
The act of reproducing or the condition or process of being reproduced
producing offspring more than once during itslifetime