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NR 578 Exam 2 Questions & 100% Correct Answers- Latest Test | Graded A+ | Passed $10.69   Add to cart

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NR 578 Exam 2 Questions & 100% Correct Answers- Latest Test | Graded A+ | Passed

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  • NR 578

Life history -:- An organism's lifetime pattern of growth, differentiation, storage, and reproduction Ways to talk about life history models -:- Physiological ecology, population ecology, community ecology Physiological ecology -:- -An individual -Mechanisms of plant adaptation -Individ...

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  • September 3, 2024
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  • NR 578
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NR 578 Exam 2 Questions & 100% Correct
Answers- Latest Test | Graded A+ | Passed
Life history


✓ -:- An organism's lifetime pattern of growth, differentiation, storage,

and reproduction




Ways to talk about life history models


✓ -:- Physiological ecology, population ecology, community ecology




Physiological ecology


✓ -:- -An individual

-Mechanisms of plant adaptation


-Individual or a few individuals assumed to represent species


-Whole plant or single




Community Ecology


✓ -:- -Vegetation composition, dominance, diversity

-identify community types and relate them to one another


-Relate community attributes to habitat factors and species composition with

environmental gradients



1|Page | Grade A+| 2024/2025

,2024 /2025 |© copyright | This work may not be copied for profit gain | Excell!
-In this kind of ecology, often identify community types of how they relate to one

another.


Ex: Ponderosa pine- mixed with different forest types depending on where it is

geographically. Sometimes intermixed with fir, with spruce, etc.




Population Ecology


✓ -:- -Differences among individuals

-Life-history traits that play out across time for the whole population


-Group attributes important


Example: Trees + population ecology - How engelmann spruce in the south

respond to drought is far different than how those in colorado respond.




Theories of Life History Evolution


✓ -:- R and K strategies




R strategists:


✓ -:- -Occupy disturbed habitats and are unable to persist long-term

-Usually short-lived, such as annual flowers


-Populations grow rapidly and are regulated by density


-Lots f reproduction


2|Page | Grade A+| 2024/2025

, 2024 /2025 |© copyright | This work may not be copied for profit gain | Excell!



K strategists


✓ -:- -Persist in the same habitat for long periods relative to their life

span, stable habitat

-Persist relatively few offspring


-Persist near the carrying capacity of the habitat for the species


-Trees could be considered a k strategist




Grime's Plant Strategies (1977)


✓ -:- Establishment phase of plants experienced three different forms

of natural selection:

-R-selection species


-C-selection species


-S-Selection species




R-selection species


✓ -:- -Ruderals- low stress, high disturbance

-Evolved in severely disturbed but potentially productive habitats


-High seed production




3|Page | Grade A+| 2024/2025

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