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ecology notes three
Terms in this set (26)
randomness producing probabilities
what is stochasticity?
environmental and demographic
what are the two types of stochasticity?
randomness that comes from the probability of birth, death or reproduction
Poisson distribution (1,2,3,...n)
Bernoulli process (coin flip for a probability that an individual will die)
what is demographic stochasticity? and what are the two examples?
small populations and it is density dependent
what type of populations does demographic stochasticity effect?
considers the influence of the environment on birth and death
what is environmental stochasticity?
no its independent
is environmental stochasticity density dependent?
it is when an individual moves outside their home range of where they usually are
what is dispersal?
active and passive
what are the two types of dispersal?
when an individual moves to a new area on its own
what is active dispersal?
when a individual moves to a new area with help of water, wind, or animal assistance
what is passive dispersal?
dispersal is an individual proactive while migration is a group of individuals
what is the difference between dispersal and migration?
departure, transfer, and settlement
what are the three phases of dispersal?
near the original location
because it comes at a cost and a risk of being preyed upon
where do individuals tend to disperse to? why is this?
the probability that an individual will reach a certain point in one event
what is a dispersal kernel?
all individuals have the same probability of disperse the same distance
what is neutral dispersal?
when individuals have info on the area and they determine their probability to make it
what is informed dispersal?
body size, genetics, wing size
what three factors influence informed dispersal?
density independent is passive dispersal and is when individuals formed adaptations to disperse
density dependent is active dispersal that looks at habitat size, population size when moving to a new area
what is the difference of density independent and density dependent?
male, genotype, and larger body mass
what are three characteristics of a good disperser?
the species that are good at dispersing into new habitats are bad competitors so they die off compared to the competitors
what is competition colonization tradeoff
the good dispersals all dispersed making a new population demographic since they moved to a new area
how may there be a colonization of good dispersals in one area?
roads, bridges, and dams
what are examples of human-modified landscapes?
where would there be a decreased dispersal/ high morality?
make it harder for the individuals to disperse or create a place to disperse more like green bridges
what do landscapes do to dispersal?
variation becomes smaller because the lager the population the less effected
what happens when you increase initial population size?
it either goes to 0 and extinction or goes to carrying capacity and stays there
what happens when you run a graph for a while?
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