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19 Cards in this Set
- Front
- Back
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Population growth |
When environmental conditions are suitable, the size of a population can increase rapidly |
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Linear growth |
Both variables grow in equal increments |
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Exponential growth |
J curve; occurs when a population increases by a fixed percentage each year |
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Biotic potential |
The highest rate of reproduction under ideal conditions |
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Limiting factors |
•available food •available water •temperature •light |
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Carrying capacity |
The largest number of individuals an environment can support |
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Limiting factors: Species - species |
•food •hierarchy in feeding- alphas eat first •competition for rank •mating •territory •population numbers |
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Limiting factors: Interspecific |
•habitats •territories •predator/prey •population numbers |
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DDT |
•post WWII insecticide used for killing mosquito's •caused birds who consumed it's bodies to block the absorption of calcium •not soluble in water •silent spring by Rachel Carson (1962) informed people about it •banned in 1972 |
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PCBs |
•used for paper making 1957-1971 carbonless copy paper •accumulates in fat tissue of everything that consumes it, absorbed into food web •39 mile stretch of fox river •dredging/cleanup started 2009 |
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Interspecific competition |
Competition between species |
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Density Dependant factors |
Have an increasing effect as population grows, ex: diseases, competition |
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Density independent factors |
Affect all populations, regardless of size, usually abiotic |
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Acid rain |
Forms when nitrogen and sulfur dissolve in atmospheric water vapor; forms nitric & sulfuric acids |
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Primary succesion |
The gradual colonization of a barren area by organisms; no soil base, starts with very simple organisms. Ex: volcanic eruption covers everything in lava & a new ecosystem has to start from scratch |
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Secondary succesion |
A sequence of changes that takes place when a community (climax or near climax) is disrupted by natural disturbances or human actions; occurs more rapidly than primary succession. Ex: forest fire |
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Consequences of crowding |
•organisms produce less offspring, become agressive •decline in population size |
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Invasive animals |
•zebra mussels •asian carp •goby •asian beetle •rusty crayfish |
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Invasive plants |
•phragmites •purple loosestrife •buckthorn •barberry •honeysuckle |
