- Oct 2021
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bio.libretexts.org bio.libretexts.org
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Biologists are often interested in knowing the “value” of the different individuals from a practical standpoint because knowing something about the reproductive value can suggest which individuals should be harvested, killed, transplanted, etc. from a conservation or management perspective.
I find this interesting because I never thought about how an organism's life history and reproduction value at different ages would impact decisions regarding their management or survival in an ecosystem
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survivorship schedule
is this similar to a population pyraimd?
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- Sep 2021
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bio.libretexts.org bio.libretexts.org
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Thus, all species have an energy budget
I find it interesting how so many different species spend their energy differently. It doesn't seem as though there is one type of energy that is selected for in nature because there is such variation in the way species spend their energy
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bio.libretexts.org bio.libretexts.org
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As many as 50,000 acorns can be produced by an individual tree, but the germination rate is low as many of these rot or are eaten by animals such as squirrels. In some years, oaks may produce an exceptionally large number of acorns, and these years may be on a two- or three-year cycle depending on the species of oak (r-selection)
do r-selected species grow exponentially?
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bio.libretexts.org bio.libretexts.org
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taxonomically "cryptic species" look very similar to other species and may be misidentified (and hence overlooked as being a different species).
incipient species could fall into this category (?)
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bio.libretexts.org bio.libretexts.org
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Species richness and species evenness are probably the most frequently used measures of the total biodiversity of a region
other than tagging, what are ways in which they can track the organisms while making sure that they are not recounting the same organism?
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bio.libretexts.org bio.libretexts.org
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Genetic drift can also be magnified by natural events, such as a natural disaster that kills—at random—a large portion of the population. Known as the bottleneck effect, it results in a large portion of the genome suddenly being wiped out
As climate change continues, and more natural disasters such as forrest fires occur, how will this impact the ecosystem as a result of the bottleneck effect that many different populations will be impacted by?
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bio.libretexts.org bio.libretexts.org
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Similarly, the hypothetical mouse population may evolve to take on a different coloration if something were to cause the forest floor where they live to change color.
An example of directional selection that I learned about in biology class was the survival of brown and white mice in the desert because they either blend in with the sand or rocks making them less likely to be eaten by hawks
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bio.libretexts.org bio.libretexts.org
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Dispersal is when a few members of a species move to a new geographical area, and vicariance is when a natural situation arises to physically divide organisms.
Which of these two categories is the more common cause of allopatric speciation? Also, will climate change make the vicariance category more common or the dispersal category more common?
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bio.libretexts.org bio.libretexts.org
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Like anatomical structures, the structures of the molecules of life reflect descent with modification.
I find the fact that structures of molecules also reflect descent with modification interesting because I had only learned how organisms reflect descent with modification, not molecules
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