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18 Cards in this Set
- Front
- Back
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Keystone species |
~Robert Paine (1966, 1969) :proposed that the feeding activities of a fewspecies have inordinate influences on community structure. |
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Disturbance |
storms,fire, floods, human activity – that changes communities by removing organismsor altering resource availability |
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Intermediatedisturbancehypothesis |
-moderate levels of disturbance fosterthe greatest species diversity |
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Whydo intermediate levels of disturbance maximize species diversity? |
-Low disturbance may result incompetitive exclusion - High disturbance excludesslow-growing and slow-colonizing species |
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k-selected species |
: slow population growth : slow development : late reproductive age : produce few, large offspring : highly competitive |
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r-selected species |
: fast population growth : rapid development : early reproductive age : small body size : produce many offspring : poor competitors |
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Ecological succession |
transitionin species composition of a community through time. |
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Primary succession |
occurs in an area where organisms werenot present and where soil had not yetformed |
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Secondary succession |
occurs when an existing community hasbeen cleared by some disturbance thatleaves the soil intact. |
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Whatdrives ecological succession? |
- Facilitation - Inhibition - Tolerance |
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Facilitation |
earlycolonizers facilitate the arrival of later species bymodifying the environment |
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Inhibition |
earlyspecies may inhibit establishment of later species;may require additional disturbance for subsequent colonization |
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Tolerance |
earlyspecies may be independent of later arriving species |
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Evolutionary history |
tropical communities are generally older than temperate and polar communities |
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Climate |
especiallysolar input, water availability, and temperature |
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Evapotranspiration |
measure of evaporation of water from soilplus transpiration of water from plants :much higher in warm, humid areas than cool or dry areas |
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Species area curve |
allelse being equal, the larger the geographic area of a community, the morespecies it has. |
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Read over summary (slide 61) |
Read over summary (slide 61) |
