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24 Cards in this Set
- Front
- Back
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Ecological Drift
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Communities change over time based on random events
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Succession
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Man did it, directional change in a community composition a site
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Disturbance
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A discrete event that damages or kills residents on a site; either catastrophic or non-cat.
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Stress
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Abiotic factor that reduces growth, reproduction, or survival of indivuduals
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Catastrophic Disturbance
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A disturbance that kills all residents of all species on a site
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Non-Catastrophic Disturbance
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A disturbance that falls short of wiping out all organisms from a site
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Primary succession
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Succession that occurs after the creation of a "blank slate"
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Secondary Succession
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Succession that occurs after a non-catastrophic disturbance
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Chronosequence
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A set of forested sites that share similar attributes but are of different ages
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Usable Nitrogen
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Comes from legumes and lightning
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Why do the plants change from near shore line to closer inland?
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Frequency of disturbance
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Fire influences ecosystems by:
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Reducing competition Altering seed bed characteristics Changing soil nutrient s in environment Reducing forest floor mass |
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Early successional species
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Fast growing, well dispersed species (opportunist, or r-selected life histories)
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Late successional species
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Slower growing, more competitive (k-selected) species
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Predation
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Straight-forward interspecies population interaction; one species uses another as a food source
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Tactics of the predator
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Cloak Hide and wait Venom Trap-doors Bigger, badder, faster Combination of some |
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Response of the prey
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Cloak FLEE!!! Poison and aposematic coloration Armor Play dead Strength in numbers |
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Brood parasites
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Rely of other organisms to raise their young
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Kleptoparasites
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Thieves
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Symbionts
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Live in close association with their host
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When is it co-evolution
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When two interacting species adapt in response to the other species
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Dominant/Foundation species
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Single species that defines much of the structure of a community
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Ecosystem Engineers
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Organism that changes the environment by transforming living or nonliving materials from one physical state to another
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Redundant species
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Serve similar roles in the environment
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