Log in
HomeClass Notes1,200,000CA670,000

BIOL 2260 Lecture Notes - Lecture 6: Adolph Murie, Hellbender, Observational Error

17 views9 pages
plumhedgehog200
9 Jan 2016
School
Trent University
Department
Biology
Course
BIOL 2260
Professor
Hossie Tom

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Learning outcomes: gain a basic understanding of age structure, explain the difference between cohort & static life tables, be able to interpret survivorship curves, and identify the three idealized types . Nt+1 = nt + nt (b + d) Age structure: the distribution of individuals amongst age classes. Can strongly influence a population"s growth rate s g g e f o. The avian egg - romanoff & romanoff 1949. The wolves of mount mckinley - murie 1944. Cohort: r = b - d r < 0 pop. decreasing r = 0 pop. stable r > 0 pop. increasing. Photo: gary peeples/usfws: size (mm) accurately predicts age, shift in size (age) structure towards fewer young individuals, lack of recruitment could indicate, reproductive failure, low survival of eggs / young individuals. Patterns of survival vary widely among species & can vary within a species over time or in different environments. Age-specific information about survival & reproduction improves population projections.

Get access

Grade+
$40 USD/m
Billed monthly
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers

Related Documents

BIOL 2260 Lecture 10: *LECTURE* Oct. 15:15
plumhedgehog200
BIOL 2260 Lecture Notes - Lecture 6: Perennial Plant, Cleome, Dall Sheep
brownsea-lion234
BIOL-208 Lecture Notes - Lecture 10: Life Table, Population Ecology, Germination
eringerbil565

Related Questions

Populations (Ecology)

•What’s the difference between a cohort and static life table and what are the difficulties with each? Be able to interpret data in a life table.

• Be able to draw or interpret survivorship curves for different populations. What are the differences between the three types?

• Why does population age structure matter?

• What happened to Pablo Escobar’s hippos? What are some possible consequences? What might happen in the future?

• What are exponential and geometric growth?

• Be able to graph population size over time for a given growth rate (like figure 10.11).

• What’s the difference between density dependent and density independent factors to limit growth? Give examples. Which one regulates population size? Why?

• What is logistic growth? Explain how the growth rate changes at different population sizes. Be able to compare logistic and exponential growth.

• What are the four factors that affect population size over time?

• What are population cycles? What are some of the factors that drive them?

• What is delayed density dependence and why does delayed density dependence cause populations to fluctuate? What factors affect these fluctuations? Be able to draw typical population fluctuation figures like fig. 11.10.

• What’s the difference between stabilizing and destabilizing feedbacks? How do delayed feedbacks affect a stabilizing feedback?

• How does population size affect the likelihood of extinction?

• What is the Allee effect? How does it affect growth rate at different population densities? Draw a figure illustrating this.

HELP ON ECOLOGY LAB REPORT PLEASE!!!

- The AIM of this lab exercise: Does Eastern Mosquitofish (Gambusia holbrooki) population structure differ with season?

- You will compare population structure in an FIU pond from February 2018 (previous semester) with the data that you collect this semester (September 2018).

- CREATE HYPOTHESIS ABOUT POPULATION STRUCTURE (HELP PLEASE)

(HELP PLEASE) Include at least one paragraph ON THE key points of comparison between the life tables. Include the major results for population structure, even if no difference is found! Do these populations differ with respect to optimal age of sexual maturity, R0, G, and r?

FEBRUARY 2018 CURRENT RESULTS

Age Class (days)
x		 Sample/ Age
s(x)		 Number/ Age
n(x)		 Survival Rate
1(x)		 Fecundity b(x) Offspring/Ind 1(x)*b(x)

Age Weighted Fecundity 1(x)*b(x)*x
0 24 120 1 0 0 0
30 39 96 0.8 0 0 0
60 19 57 0.475 0 0 0
90 21 38 0.317 24 7.608 684.72
120 8 17 0.142 27 3.834 460.08
150 5 9 0.075 29 2.175 326.25
180 2 4 0.033 32 1.056 190.08
210 0 2 0.017 0 0 0
240 1 2 0.017 0 0 0
Sum 120 R0

14.673 Offspring
G 113.209 Days
r

0.024 Ind/ Days

Optimal Age for Sexual Maturity

 120 Days

SEPTEMBER 2018 RESULTS:

Life Table
Age class (days) Sample/ age class Number/ age class Survival rate Fecundity Offspring/ individual Age-weighted fecundity
x n(x) n(x) l(x) b(x) l(x)*b(x) l(x)*b(x)*x
0 9 150 1 0 0 0
30 12 141 0.94 0 0 0
60 26 129 0.86 0 0 0
90 29 103 0.687 24 16.48 1483.2
120 33 74 0.493 27 13.32 1598.4
150 18 41 0.273 29 7.93 1189
180 16 23 0.153 32 4.91 883.2
210 7 7 0.047 0 0 0
240 0 0 0 0 0 0
Sum 150
R0 42.63 offspring
G 120.89 days
r 0.03 individuals/ day
Optimal age for sexual maturity 120 days

1. What is the difference between the different patternsof selection: directional, stabilizing, anddiversifying?

2. How do bacteria acquire genetic variation and how doesthat differ from the mechanism by which humans acquirevariation?

3. What were the key observations made by Darwin todevelop the basic tenants of the theory of evolution? Has thistheory been tested?

4. What are the most common misconceptions about evolutionand why are they not valid arguments against evolution?

5. The key component of the theory of evolution is naturalselection. Define this process. Why is it commonly known as“survival of the fittest”? What are examples of factors (selectivepressures) that drive evolution of populations?

6. What is the indirect evidence of evolution? What arehomologous and analogous structures? What is convergent evolution?How does similarity of proteins between different species supportthe idea of evolution?

7. Be able to explain why the following statement is true:Natural Selection works on individuals while evolution works onpopulations over generations. Or to put it another way: Individualsdo not evolve, populations do.

8. How can evolution explain the formation of complexstructures such as the eye or the flagella motor?

9. What causes variation in a species? To put this anotherway: all humans have the same genes, yet we do not look alike. Whatis the reason fro the phenotypic differences between individuals ofthe same species? What is genetic recombination?

10. What are the dangers of small populations of a speciesfrom a genetic and evolutionary standpoint? What is the bottleneckeffect?

11. How does speciation occur? What is the importance ofgeographic isolation? How is this illustrated in theGalapagos?

12. What is Darwinian Medicine and how does it help usbetter understand medical conditions?