Term
Temperature and moisture (and interactions between these) are central to what? |
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Definition
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Term
How are temperature gradients on Earth determined? |
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Definition
Incoming solar radiation (40% at poles vs 100% at the equator) and the distribution of land and water |
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Term
Is there greater precipitation at the poles or at the equator? |
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Definition
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Term
Do mountains get more or less precipitation than flatter, more even surfaces? |
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Definition
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Term
What two factors are ultimately important to organisms when it comes to precipitation? |
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Definition
Evaporation (how much water is returned to the atmosphere) and transpiration (how much water an organism loses through biological process); both of these are highly dependent on temperature |
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Term
What makes polar regions not as (generally) bad as desert conditions for habitats? |
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Definition
The lower temperature at polar regions means there is less evaporation |
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Term
Survival, reproduction, development of young and interactions with other species can all be impacted by what two important abiotic factors? |
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Definition
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Term
What important limiting factor is often created by temperature fluctuations? |
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Definition
There is often a limitation tied to increased energetic demands caused by cold weather |
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Term
Plants are (blank) sensitive to water availability and show (blank) variability to drought resistance |
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Definition
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Term
Increasing the depths of their roots is one way in which plants can do what? |
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Definition
Increase water uptake and thereby resist drought easier |
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Term
Closing the stoma, preventing cuticular respiration (making thicker cuticles), reducing leaf surface area and shedding leaves altogether during a drought season are all ways for plants to do what? |
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Definition
Reduce water loss and thereby resist drought |
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Term
What is one important issue to note about colder temperatures in winter and how they relate to water accumulation/loss? |
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Definition
There is such a thing as a "winter drought" where cold temperatures severely limit the amount of water that pine trees are able to take up; this is more concentrated in cold, northern areas |
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Term
What is the process by which phenotypes have become genetically fixed and constant across different environments? |
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Definition
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Term
This is the process by which individuals differ genetically for traits that improve survivorship in different environments |
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Definition
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Term
What is the idea behind phenotypic plasticity? |
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Definition
It is the process where intrageneration changes in a trait are caused by environmental cues |
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Term
What did Clausen et al. (1948) show with regard to plant height? |
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Definition
They showed that plant height in yarrow is strongly dictated by the winter temperature and precipitation |
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Term
What is so important to note regarding phenotypic plasticity and how it is generated? |
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Definition
It is likely under genetic control and can thus evolve by means of natural selection if put under evolutionary pressure |
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Term
What does the term "ecotype" refer to? |
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Definition
It is the genetic varieties within a species |
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Term
What would you expect to see if a trait or condition is plastic? |
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Definition
All individuals will respond the same to the common environment and produce different phenotypes in different environments |
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Term
These responses are irreversible and produce discrete rather than continuous phenotypic variation; these responses occur early in ontogeny and organisms ultimately have to commit to one phenotype or the other |
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Definition
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Term
These responses are reversible and produce continuous rather than discrete phenotypic variation; these responses can occur at multiple stages of ontogeny |
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Definition
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