Invasive Species Assignment

Invasive Species Assignment

 

1.  a) Identify ONE invasive species in the United States (other than those discussed in lecture or this homework – ladybird beetles, honeysuckle, emerald ash borers, burning bush, zebra mussels and round gobies), that poses a threat to native species due to INTERSPECIFIC COMPETITION.   How and where did this species get introduced, and what is its current distribution?  Are there any biotic or abiotic factors that limit its distribution in the US?  Were there any biotic or abiotic factors that limited its distribution in its native range?

 

 

 

 

 

 

 

 

 

 

 

 

b) Identify at least one native species that the invasive species is competing with, and at least one resource that is the object of the competition.  What is the likely outcome of the competitive interaction described (e.g. coexistence, extinction, etc.) and why?  Provide your reference at the end.  (It does not need to be from the primary literature but it does need to be properly cited).

 

 

 

 

 

 

 

 

 

2.  The common-bean (Phaseolus vulgaris; below left) is the protein, mineral and fiber-rich bean eaten by humans throughout much of the world.  The common-beans can be sensitive to weeds growing in crop fields with them, reducing crop yield.  In order to determine whether alexandergrass (Brachiaria plantaginea; below right) is a weed that poses a competitive threat to common-beans, the following DeWit replacement series experiments were conducted to obtain the results in the table. Relative biomass was reported in order to make comparisons between the plants, which differ in aboveground size. 

Common bean (Phaseolus vulgaris) flowers and pods

  

 

 

Pot proportions (B. plant.: P. vulg.)

B. plant. relative biomass

competitive equivalence

Pot proportions (P. vulg: B. plant.)

P. vulg. relative biomass

competitive equivalence

0

0

0

0

0

0

0.25

0.1

0.25

0.25

0.3

0.25

0.5

0.25

0.5

0.5

0.6

0.5

0.75

0.48

0.75

0.75

0.8

0.75

1

1

1

1

1

1

 

a) Plot the De Wit replacement series for each species on the following graphs.  Be sure to label the axes. (Or insert properly labeled figures from Excel)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

b) Based on the data in the above figures, what conclusion should you draw about the competitive threat alexandergrass poses to common-beans in crop fields and the competitive interactions between the two species generally?  Please explain. 

 

 

 

 

 

 

 

3.  a) The round goby (Neogobius melanostomus, below left), is an invasive fish in the Great Lakes.  It was first detected in the Detroit and St. Clair Rivers between 1990 and 1992, having been introduced via ballast water of ships coming from the Caspian and Black Seas.  The northern logperch (Percina caprodes, below right), is a native species the round gobies are competing with.    

https://www.lakescientist.com/wp-content/uploads/2011/08/round-goby2.jpg
Logperch (Percina caprodes) - Species Profile

Using the data below, plot the functional response curves for each species feeding on live amphipods (Hyalella azteca) in laboratory aquaria.   Be sure to label the graph axes and indicate what symbol is used to represent each species.  

Initial Prey Density

Average Prey Consumed

per Round Goby

Average Prey Consumed

per Northern Logperch

5

2

1

10

4

2

15

5

3

20

6

4

35

10

4

50

13

6

65

16

6

80

18

6

100

20

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

b) What type of functional response curves did you plot for each species?  Explain the biological reasons behind the curves having the shapes that they do for each species.  Then evaluate the figure and explain what you can infer about the competitive interactions between round gobies and northern logperch. 

Round goby type and explanation:

 

 

 

Northern logperch type and explanation:

 

 

 

Conclusions about competitive interactions:

 

 

 

 

Invasive Species assignment

Invasive Species assignment

Ecology Lab

Dr. Hoffman

Invasive Species assignment (10 pts)

 

 

Your assignment is to produce a 2-page, double spaced summary of a scientific journal article that focuses on some aspect of an invasive species.  The research paper must not have been published prior to 2009. Your summary should consist of four paragraphs, one for each of the major sections of the paper (Intro, Methods, Results, Discussion).

Also, the research must have been conducted in an area where the species is considered invasive.  For example, nutria (Myocastor coypus) are native to South America but invasive in Louisiana.  Research that was conducted on nutria in Louisiana is appropriate, but research done in South America is not.  This would also apply to species that are native to one part of a country but invasive to another (Hint: most often there is a section in the Methods that describes the study area and where the research was done.)

Finally, a hardcopy of the paper you chose must be turned in with your summary. Google Scholar is a good place to find pdf copy of journal articles.  Also, the library has a very good interlibrary loan system that can typically get you a pdf copy of the paper you want within a day or so.