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Lecture 22

BIOSC 0160 Lecture 22: Biology 2 Lecture 3.5: Population Ecology 2
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Department
Biological Sciences
Course
BIOSC 0160
Professor
Nilson
Semester
Spring

Description
Biology Week 14 4617 Lecture 3.5 How can we model population growth? How does a species life history influence population growth? Do not need to readunderstandknow chapter 54.3 R0= net reproductive rate = average number of female offspring that a female produced over her lifetime o = sum 0 to k (older age class in population) of lxmx lx = NxN0 mx given o <1: shrinking o =1: stable (replacement rate) o >1: growing o Cannot be compared across species because it is scaled to generation time More information as to what is causing changes in the population growth rates Life history: describes how an individual allocates resources to growth, survival, and reproduction o Lower survivorship but higher fecundity vs. o Higher survivorship, but lower fecundity o Tradeoffs: how organisms allocate their limited resources (allocate to offspring less to survival and vice versa) Exponential growth: as population size increases, the number of new individuals added to the population per unit time accelerates o N t+1 N t birth death (ignore immigration and emigration) o N t+1 N t bN t dN tb=birthsindividuals in sample, d=deathsindividuals in the sample) o Nt = N tbd) o bd = r; Nt = rt o r<0: population is shrinking o r=0: population is stable (corresponds with0R = 1) o r>0: population is growing r corrects for generation time and can use it to make comparisons across species o r=0.1: the population grows by 10 each time period If t = 10, then the population adds 1 in one year If N = 100, then the population adds 10 in one year t o r does not change with size of population, exponential population growth is considered density independent o We observe exponential growth when A few individuals found a new population (founder effect) A population experiences a catastrophic event and then begins to recover from a few individuals (bottleneck effect) o Eventually exponential growth slows
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