A Case of Rodent Speciation



As an expert in the field of mammalian reproductive strategies, you have been hired by the Department of Nature and Island Resources of the West Indies. This organization is a cooperative of several West Indies islands concerned with the loss of biological diversity on their island nations as tourism and development continue to grow. Scientists working on the island of St. Kitts and its sister island Nevis have uncovered what appears to be a previously undiscovered species of rodent.


Based on the original description of this animal, it was placed in a genus within the squirrel family. What you have been hired to do is to help save the population on St. Kitts, which is small and threatened by development. The population is so small that individuals are having difficulty finding mates and, in many cases, the reproductive seasons are being delayed by up to one year. When you arrive in the region and begin your observations, you notice that the Nevis population is very healthy and could be used as stock for the recovery operation that you plan on the island of St. Kitts.


In your  recovery  plan,  you  bring  animals  from Nevis into the population on St. Kitts to bolster the population numbers, ensure the availability of mates, and increase the genetic diversity within the shrinking population. As a good scientist, you observe the reproductive behaviors of this animal in the field to ensure the success of your program. Within a very short time, you realize that your plan is failing. In the 240 attempts to bring a Nevis animal into the St. Kitts population, you are unable to observe a single successful reproductive event. Although these animals look identical, you are concerned that they are two distinct species. Your focus now becomes identifying the differences between the two populations. What follows is a brief review of the data you collected from your study.




St. Kitts RodentNevis Rodent

Average weight: 83gAverage weight: 86g

Average length: 21.8cmAverage length: 23.3cm

Average hind limb: 7.8cmAverage hind limb: 4.2cm

Average forelimb: 4.2cmAverage forelimb: 3.9cm

Top speed: 2.2 meters/second (m/s)Top speed: 0.8m/s

Average leap height: 1.4mAverage leap height: 0.4m

Average gestation time: 29.3 daysAverage gestation time: 42.7 days

Average time spent in courtship display: 12.6 secondsAverage time spent in courtship display: 21.3 seconds



This case study describes a recovery program for a rodent population on the island of St. Kitts in the

Caribbean. After reading the case study above, your job is to formulate your own story incorporating some

of the details and data provided while also drawing on several evolutionary concepts studied in class. A list of

these concepts can be found at the end of this document.


There are no limitations on the details you can incorporate into your story, but it should follow some specific guidelines. Your story:

1.Should be 600 words or less.

2.Should incorporate the data supplied in the case study.

3.Should incorporate at least three of the concepts from the “Concept List.” As you incorporate each

concept, you must demonstrate its relevance to your story.

4.Can be told in any form. For instance, one student presented the story as field notes collected from

observing the animals in their natural habitat. Another student presented the story as a series of

experiments and observations made by groups of scientists over hundreds of years. Be creative.

5.Should account for the data on the organisms provided in the case study. It is acceptable to add more

data as you develop your story as long as it fits into the patterns of the data provided.

6.Can include graphics and illustrations. Be sure to cite the source and give credit for the material,

including material taken from the Internet. Avoid plagiarism.

7.Should include a scientific and common name* (see Note below) for the rodent populations. In

developing these names, make sure you use the rules for binomial classification. In addition, make sure

that you put the rodents into an existing genus. You come up with the species names.

8.Needs a good title.

9.Proof read. Check for spelling errors. Make sure your sentences are grammatically correct and that they are complete sentences.


Remember that you are developing an evolutionary picture of a rodent population using data supplied

with the case study. Keep in mind that in an evolutionary story you will be describing events that may have

occurred over very long time periods.


Important: When incorporating concepts from the “Concept List” into your story, you must elaborate on how they relate to your story. Simply including a concept word in your assignment is not acceptable. For example, stating that “the animals became two species because of genetic drift” is not sufficient. You must also explain how genetic drift works in this process.

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