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42 Cards in this Set
- Front
- Back
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population density |
the number of individuals per unit of area or volume |
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population size |
the total number of individuals in the population |
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geographic range |
the region within which a species occurs; |
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habitats |
the particular environment in which an organism lives |
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habitat patches |
areas of suitable habitat for a species that are separated by areas of unsuitable habitats |
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BD model |
birth death model |
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B |
birth |
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D |
death |
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E |
Emigration |
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I |
Imigration |
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varying density movement migration |
Challenges to getting a population count |
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count species in a sample area multiply by true area mark and recapture, then use proportions |
How to estimate the numbers of individuals in a population |
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BD; once extinct it doesn't come back BIDE; once extinct, immigration can bring it back |
BD model vs... BIDE model |
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(B+I)-(D+E) (in)_(out) |
Formula for growth |
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principle of allocation |
species prioritize their energy can only be used one function at a time |
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K number of individuals a habitat can support |
carrying capacity |
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Intraspecific competition occurs |
when the number of individuals reaches carrying capacity |
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density-independent; natural disasters, weather density-dependent; individuals affecting one another |
density-independent vs...density-dependent |
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Intraspecific |
within species |
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Interspecific |
between species |
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Mutualism |
+/+ bees and flowers |
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Competition |
-/- vultures and hyenas |
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Consumer-Resource |
+/- herbivory or parasitism |
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Ammensalism |
-/0 elephants and bugs |
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Commensalism |
+/0 cowbirds on cows |
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per capita growth rate |
r growth in population size |
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life history |
the time course of growth and development, reproduction, and death during an average individual's life |
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life table |
a summary of information about the progression of individuals in a population through various stages of the life cycle |
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survivorship |
the fraction of individuals from birth to different life stages or ages |
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fecundity |
the average number of offspring each individual produces at each life stage |
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resources |
something in the environment required by an organism for growth and maintenance |
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multiplicative |
adds a constant multiple j-shapped |
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additive growth |
constant number added linear |
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density dependent |
when pop becomes more crowded and r goes down |
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equillibrium |
r=0 population doesn't change in size |
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metapopulation |
bigger population consisting of subpopulations |
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BIDE model |
birth death emigration immigration model |
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limiting resource |
short supply for demand |
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predation |
predator kills and consumes its prey |
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herbivory |
animal consumes a plant |
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parasitism |
parasitic organism consumes an individual |
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resource partitioning |
coexistence |
