Ecology homework help.

  1. Please identify the type of species interaction or relationship that is shown in the figure above and provide an explanation for your identification.


  1. Two species of warblers compete for grasshoppers. The carrying capacity for poet warblers is 111 individuals and the carrying capacity for greenleaf warblers is 140 individuals. Their competition coefficients are 0.9 and 1.43, respectively. Can these two species coexist? Please draw their zero net growth isoclines (ZNGI’s) and explain what the graph shows about the possibility of their coexistence.


  1. In a prairie, you find both poet and greenleaf warblers. How is this possible?
  2. 3. a. Please identify if the graph above is an example of density dependent or density independent factors. Please provide an explanation for your assessment.


  1. Please identify if the graph above is an example of top-down or bottom-up control mechanism. Please provide an explanation for your assessment. Note: This species         interaction is in the absence of human influence.


  1. 4. Farmer John has a rat problem in his barn. Last December, he assessed that there were approximately 40 individuals. A heavy snow season prevented Farmer John from getting rid of the rats and in March, he estimated 80 individuals. What is the intrinsic rate of rat population increase (r)? Calculations are required for full credit.


  1. Due to a tractor accident, Farmer John was not able to get rid of the rats in March. What is the projected population size in two (2) months, when Farmer John’s leg is

expected to heal and the cast is removed? Calculations are required for full credit.

Survivorship Fecundity
X ax lx Fx mx lx mx
Age (yrs.) Number surviving to age x Proportion  Surviving from age 0 to age x Total offspring produced by population at age x Offspring per individual at age x Realized fecundity
(Data) ax / a0 (Data) Fx / ax lx * mx
0 1320 1.00 0 0 0
5 508 0.38 0 0 0
10 76 0.06 0 0 0
15 32 0.02 0 0 0
20 21 0.02 0 0 0
25 19 0.01 0 0 0
30 7 0.01 0 0 0
35 1 0.001 476 476 0.48
40 0 0 0
  1. a. The above is a life table of a species. Based on the data provided, what is the realized fecundity of 25 year olds? How many offspring do all the 35 year olds produce? What is the net reproductive rate of the cohort and is the population increasing or decreasing?


  1. Based on the data, what type of survivorship curve is exhibited by the species? Please explain your reasoning. What is the reproductive strategy of this species? Please explain your reasoning


  1. The figures above show horse evolution in two different ways. Which figure represents anagenesis and which figure represents cladogenesis? Which of these figures is a more accurate depiction of horse evolution? Please provide an explanation for your reasoning.


  1. Kelly’s favorite flower is a daisy (Gerbera sp.) and her favorite color is pink. Unfortunately, José cannot find a daisy with pink flowers at the garden store. So, José buys a daisy plant with red flowers and a daisy plant with white flowers to cross in order to get a daisy plant with pink flowers. However, every daisy plant offspring José gets from the crossing have speckled red and white flowers. What is the explanation for this red and white speckled flower pattern and why is David not getting a daisy plant with pink flowers?


Ecology homework help