BIOLOGY 3SS3 Lecture 3: nonlinear_4.handouts.pdf

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violetwater-buffalo117

10 Mar 2015

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Small populations: population success (reproductive number) may be lower for very small populations. We"ve already assumed reproductive numbers are low for very large populations: small populations are likely to be harder to predict. 5. 1 allee e ects: e ects which cause small populations to have low per-capita growth rates are called allee e ects. Types of allee e ect: allee e ects can a ect the birth rate, or the death rate. Allee e ect models: what will this model do, if the initial population is: 1 t e a r a t i p a c r e. 1 n o i t l a u p o. Allee effect in birth rate t p o p e t a r l a t o. Allee effect in birth rate n o i t l a u p o.

Related Questions

. Describe your response to a sudden severe pain in your ownexperience; for example, an injury. Describe your physical responseand your emotional reactions.b. Using your knowledge of normalphysiology, list the e?ects of increased sympathetic nervous systemstimulation on body function and muscle tone.c. Suggest howmonitoring for sympathetic nervous system changes assists you inevaluating a person

For this example we are going to use the combination of Populations A and B as or standardized population. Complete the table below and calculate the age-adjusted mortality rates for populations A and B. You must show your calculations:

	Age Distribution in Standard Population (A & B Combined)	Population A	Population B
	Age Distribution in Standard Population (A & B Combined)	Expected Deaths based on Standardized Population	Expected Deaths based on Standardized Population
<15
15-44
45+
TOTAL
Age-Adjusted Rates per 1,000

Compare the results from the crude death rates to those seen in the adjusted rates. How do you explain the differences?

In this example, the age-specific death rates for Population A and Population B are different. Explain what the results would be if the age-specific death rates in the two populations were the same (hint: you do not need to do these calculations)?

Which measure (crude or adjusted) is more appropriate for inter-population comparisons and why?

The choice of a standard population for the age adjustment is somewhat arbitrary. One could obtain a different answer if another standard population were used. What are some examples of other standard populations that could be used? What issues would you need to consider in selecting a standard population?

I need only the last part please

puceworm846

16. Which of the following is not an example of allopatric speciation?

A) The Isthmus of Panama arose 10 million years ago dividing a species of snapping shrimp into two separate populations. Over time, individuals on one side of the isthmus became reproductively isolated from individuals on the other side.

B) A species of hummingbird lives on mainland Costa Rica. Ten individuals make their way to a small island off the coast. Over time these island birds become reproductively isolated from the mainland birds.

C) A squirrel population was divided into two groups because of the formation of the Grand Canyon. Since that time, genetic changes have occurred and the two groups of squirrels are now reproductively isolated from one another.

D) Two populations of deer are separated by a river. Over millions of years, the river dries up. When the two deer populations meet, they are able to interbreed successfully.

E) All of these are examples of allopatric speciation.

Why is D considered allopatric speciation? I thought that D is the correct answer because if the two deer populations are able to interbreed, then speciation did not occur; so it cannot be considered allopatric speciation. â

BIOLOGY 3SS3 Lecture 3: nonlinear_4.handouts.pdf

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