WFSC 403: FINAL EXAM
40 Cards in this Set
| Front | Back |
|---|---|
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nx
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number of individuals for an age class
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lx
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percent of individuals surviving from first generation/ birth
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bx
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age specific birth rate
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dx
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number of individuals who will die in that age class
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qx
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per capita mortality rate for generation x to x+1
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ex
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expectation of further life for individuals alive at the start of that generation
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λ
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finite rate of increase
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why is a life table "age structure directly observed"
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information gathered was from one point in time across different age classes to form a static life table
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What assumptions are made to construct a life table?
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age specific birth and death rates are constant and population size is constant
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If life table assumptions are not satisfied which values are incorrect?
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all of them
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R0
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net reproductive rate per generation
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R0 in words
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the average number of offspring produced by the average female during her lifetime
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How to calculate R0
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sum of lx bx's
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G
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mean length of a generation
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G in words
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the length of time between the birth of a female and average DOB of her offspring
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How to calculate G
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sum of xlxbx's/ R0
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Assumptions made to calculate R0 and G
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birth and death rates remain constant and no limit is placed on population growth
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R0 < 1
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population decreasing, downward exponential curve
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R0 > 1
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population increasing, upward exponential curve
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Semelparity
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one reproduction event
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Iteroparity
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multiple reproduction events
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Circumstances that lead to big bang reproduction
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the environment is constant and the offspring is very likely to survive to sexual maturity
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Circumstances that lead to repeated reproduction
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the environment is unstable and the offspring have a lower chance of surviving to sexual maturity
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What is the rationale supporting the evolution of semelparity or iteroparity?
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A reproductive strategy is developed to deal with the certainty or uncertainty of reproductive success due to the survival of the offspring due to the environment in which the organism lives
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Ecology is related to the sciences of
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physiology, genetics, behavior, and evolution
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The three types of dispersion are
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uniform, random, and aggregated
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Three main types of survivorship curves
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I, II, and III
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Type 1 survivorship curve characteristics
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live full physiological life
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Type 2 survivorship curve characteristics
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Constant mortality rate throughout life
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Type 3 survivorship curve characteristics
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high mortality rate in young
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Which frame from powers of 10 is most accurate and why?
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10^7, it shows all of earth which is all interconnected
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A leslie matrix is
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A population projection model and represents an age structured population
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dH/dt
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the population size of the prey over time
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dP/dt
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the population size of the predator over time
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C
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the predation rate for prey populations under predation
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K2
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The ability of a predator to turn prey into more predators
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K3
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the predator mortality rate adjustment in the absence of prey
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What outcomes can result from the predation equations?
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stable predator prey oscillations, divergent oscillations, convergent oscillations, stable equilibrium with no oscillations
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2 assumptions for predation equations
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the predator and the prey are in the same environment at the same time and there are no outside influences
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competition coefficients
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alpha and beta
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WFSC 403: FINAL EXAM