Term
| Energy-transfer hypothesis |
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Definition
| food chain length is limited by productivity |
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Term
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Definition
| long food chains are easily disrupted by envirornental perturbations and thus tend to be elimintated |
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Term
| environmental complexity hypothesis |
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Definition
| food chain length is a funcion of na ecosystems physical structure |
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Term
| gross primary productivity |
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Definition
| total amount of photosynthesis in a given area and time period |
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Term
| gross photosynthetic efficiency |
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Definition
| effieciency with which plants use the total amount of energy available to them |
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Term
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Definition
| primary consumers production of new tissue. |
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Term
| % goes to maintence? excretion and growth and reproduction. enrgy derivied from plants |
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Definition
| 80.7% maintenance. 17.7 exprection .1.6 growth |
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Term
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Definition
| - areas where elements are stored for a period of time |
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Term
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Definition
| path elements take as it moves fro abiotic systems through organisms and back again |
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Term
| decomposition rate is influence by: |
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Definition
| abiotic conditions and quality of the detritus as a nutrient source |
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Term
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Definition
| why are x amount of species at a place/time |
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Term
| community ecology tries to understand |
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Definition
| how species interact and how those interactions affect distribution and abundance |
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Term
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Definition
| how do chemicals and energy flow through specis in a ecoysystem. |
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Term
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Definition
| abiotic range of conditions favorable to a species |
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Term
| realized niche- give ex also |
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Definition
| fundamental niche modified by biotic interactions (ex.competition and predation |
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Term
| what produces different biomes |
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Definition
| temperature and precipiation and variation in temperature and preciptation. |
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Term
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Definition
| ecoyststem characterized by unique types of vegetation |
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Term
| Net primary productivity(NPP) and it represents |
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Definition
total amount of carbon that is fixed per year minus amount of fixed carbon oxidized during cell respiration.
Represents organic matter that is availbae as food for other organism |
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Term
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Definition
| intertidal neritic oceanic zone. |
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Term
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Definition
| Community is neither stably nor predictable. |
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Term
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Definition
| communities are highly predictable |
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Term
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Definition
| species that has a greater impact thhan their abundance would suggest. |
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Term
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Definition
| occurs when a disturbance removes the soil and its organisms, as well as organisms that live above the surface. |
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Term
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Definition
| occurs when a disturbance removes some or all of the organisms from an area but leaves the soil intact. |
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Term
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Definition
| are the first organisms to arrive at a newly disturbed site. They have good dispersal ability, being able to tolerate severe abiotic conditions, and high reproductive rates. However, they have little competitive ability. |
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Term
• As the number of native predator species
increases |
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Definition
diversity of native prey
species also increases (across the U.S.) |
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Term
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Definition
| early-arriving species make conditions more favorable for the arrival of certain later species. |
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Term
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Definition
| happens when existing species do not affect the probability that subsequent species will become established. |
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Term
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Definition
| occurs when the presence of one species inhibits the establishment of another. |
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Term
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Definition
| total genetic information contained within, for example, a species |
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Term
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Definition
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Term
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Definition
| the variety of biotic communities in a region, along with abiotic components such as soil, water, and nutrients |
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Term
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Definition
| alleles to go extict more rapidly in small populations than in large populations |
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Term
| alleles that become fixed |
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Definition
| genetic drift and slelection |
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Term
| low levels of genetic variation is due to |
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Definition
drift associated with founder effects and genetic bottlenecks during domestication
directional, artificial selection |
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Term
| gene flow increases variation ____ populations and decreases____ populations |
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Definition
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Term
| new speciation is caused by |
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Definition
| drift, mutation, selection |
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Term
| Sexual dimorphism refers to any trait that differs between males and females of the same species. |
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Definition
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Term
| biological species concept |
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Definition
| populations are evolutionarily independent if they are reproductively isolated from each other, i.e., they do not interbreed. |
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Term
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Definition
| Speciation that begins with physical isolation via either dispersal or vicariance is known as |
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Term
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Definition
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