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Published byBenedict Dorsey Modified over 6 years ago
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Population Ecology
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Spatial pattern An individual’s arrangement within a population may be
The spatial pattern also determines how the organisms will interact with one another
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Range geographic distribution of different species
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What 2 factors determine range?
Abiotic and biotic Predators, parasites, prey Temperature, sunlight, water, wind
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Population a group of individuals from the same species that live in the same area at the same time
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Demography A change in the size of a population through time
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Immigration indicates ________ ________
Growing populations! When we look at the population size equation, we can look at the variables to determine whether the population is growing, declining, or at equilibrium Which variable would tell us this?
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Population size formula
∆N/ ∆ t = B + I - M - E What does each variable mean?
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Fecundity the number of female offspring produced by each female in the population at a time
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What are some life history tradeoffs?
Number of offspring Size of offspring How often does the female reproduce? What kind of survivorship does the species have?
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Give an example of an example of an organism with type III survivorship
Fish! They tend to produce a lot of eggs because they have a low chance of survival, but then the ones that last will live out their life to a good age
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What is the difference between clumped, uniform, and random spatial pattern?
Clumped tends to have individuals interact in smaller groups Random means independent relations with other organisms Uniform can be for the use of interacting with others, or having no interaction, depending on the situation
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Metapopulation a population of populations connected by migration
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Survivorship the proportion of offspring produced that survive, on average, to a particular age
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Give an example of an organism with type 1 survivorship
People We have a high number of offspring that survive childhood and then live out their life to an old age and die
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Mark-recapture studies measure what?
Population abundance
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Population density the number of individuals per unit area
Can change in different environments or ranges Can be affected by distribution
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Exponential equation is for ______ independent populations
Density
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Population ecology the study of how and why the number of individuals in a population changes over time
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