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37 Cards in this Set
- Front
- Back
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Population Dynamics
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Study of how and why populations change in distribution, numbers, age structures and density
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Age Structure
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proportions of idnividauls based on various ages
1. prereproductive ages 2. reproductive ages 3. postreproductive ages |
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Biotic Potential
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a population saize increaser
the capacity of a population to grow |
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Intrisic rate of increase
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rate at which a poulation will grow if given unlimited resources
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Which one of the 4 principles of sustainability applies to limiting population growth
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population control
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environemntal resistance-
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popualtion decrease
factors that act to limit population growth |
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carrying capacity (K)
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maximum population that can e sustained in a given habitat
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what determines the carrying capacity
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resources, food habitat niche water
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Logistic Growth
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rapid growth to steady growth to leveling off
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what type of curve describes logstic growth
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s curve
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exponential growth
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starts slowly then accerlates because the base size keeps increasing
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what type of curve for exponential growth
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j curve
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population density
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number of indiviudals in aparticlar area
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asexual reproduction
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offspring are exact clones
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sexual reproduction
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mixes genetic material of both parents producing offspring with combinations of both
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r-sleected species
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opportuntiests and populations with a high rate of increase (r)
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examples of r-selected
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algae, bactera, rodents, most insects
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k-=selected species
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competitors produce late in life and have few offspring with fairly long lifespan
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examples of k-slected
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lare mamamsl, raptors, tropcal rainforest trees
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survivorship curves
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life expectancy curve based on reprodutive strategies
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late loss
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live to old ages
mammals and humans |
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constant loss
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die at all ages
song birds |
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early loss
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die at a young age
annual plants, nay insects |
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core case study: southern sea otters
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they were hunted to the brink of extinction by the arly 1900's and are now making a comeback
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why are sea otters important
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keystone sepcies for sea urchines and other kepp-eating organisms
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how do most populations live
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in clumps
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how do populations increase and decrease
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brithds and immigration
deaths and emigration |
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what happens as a population levels offf
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it often flucates slightly above and below the carrying capacity
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how do species deal with carrying capatcity
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migaigraitn got other areas or adapting
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what are examples of density dependent factors
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biotic factors like diesease
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what are examples of density independt factors
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abiotic factors like weather
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example of stable poplation
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rainforest speceis
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irruptive
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tempearte climates
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cyclic
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coniferous forests
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irregular
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natural or man-made castrophese
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wahts up with deer in the us
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25-30 million white tailed deer pose human intearctino problems
1.5 millioin have vichile collions and many transmit disesaes |
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whats the point of a surviorship curve
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to represent the age structure of a poulation
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