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Lecture

Age Structure

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Department
Biology
Course
Biology 2483A
Professor
Hugh Henry
Semester
Fall

Description
Age StructureAnother way of characterizing population is age structure Look at age classes and count the amount within each age class Members of a population whose ages fall within a specified range are said to be part of the same age classShow clearly what type of population growth you might expect Change growth rate by changing survival or fecundity If a populations age specific survival and fecundity rates are constant over time that population ultimately grows at a fixed rate from one year to the next This was the case for our hypothetical population which eventually grew at the fixed rate of lambda132 When the age structure of a population does not change from one year to the next the population is said to have a stable age distribution Age structure has an effect on whether or not the population will increase or decreaseOf 20 newborns 6 20 x S 20 x 03 survive to become 1 year olds Because S 0 o 2none of the 50 two year olds survive to become 3 year olds Each of the 6 1 year olds has 2 offspring and each of the 24 two year olds has 4 offspring so there are 108 6 x 224 x 4 newbornsIf you look at individuals a year latertime interval later divided by previous timegrowth ratehow quickly and in what direction its growing Endangered speciesturtleconservation was geared towards eggs first Born in the sandrun to t
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