Friday, January 27, 2012

Field Report 1 - DUE Thursday, Feb. 2 in lecture!

Here are a few tips to help you along the way...

Unsure what a field report includes? Review the example proposal.
Posted on SAKAI under Resources > Autecology & Evolution, you will find an example field report (field report 1 example_M Stanko.doc).  
Note: You field report experiment may not resemble this example!
Some components of a thorough experimental design that should be included in your field report:
Do not try this at home
or in a field report
(education.com).
A research question based on your field observations - Does your question have a practical application?  Is it testable?

A clear hypothesis - A predictive and informed statement, NOT a question.

Independent variable(s) - The manipulated variable or treatment, presumably the "cause".

Control treatment - The non-manipulated treatment that serves as the experiment's baseline.  Manipulative experiments commonly have a negative control and a positive/procedural control to help eliminate as many artifacts as possible that are introduced by the experimental procure.  If unaccounted for, these experimental artifacts may confound the results.

Dependent variables - Response variable(s) that are measured, presumably the "effect". Do not forget to include units of measurement, such as weight (oz., lb.), time (sec., min.), etc.

Standardized variables - These are other factors or variables that could fluctuate/differ  and affect your results, but are not relevant to your research question. Extraneous conditions not relevant to your hypothesis should be constant throughout all of the treatments; this helps isolate the effects of the independent (manipulated) variable on the dependent variable.  
Note:  Some people use the term "controlled variables" to describe variables that are standardized across treatments, but this can cause confusion, so I prefer to use the term  "standardized variables".

Replication - What is your level of replication?  How many times will you do the experiment or how many individuals will you include to get a representative sample size?

Methods - Your experimental design should be repeatable to anyone who picks up your field report.  Make sure you clearly identify all of the above terms in your experimental design.  Your design must have all of those components!

Expected results - Because your hypothesis is a predictive statement based on your field observations, you probably have an idea of what the outcomes of the experiment might be.  What do you expect to observe that will allow you to accept or reject your hypothesis?  If you are familiar with statistics and know an appropriate statistical method for your data analysis you may include that, but statistics are not mandatory.

Use those key terms when designing your experiment and writing your report!  Uncertain your organism or question is appropriate?  Feel free to email me before Wednesday (Feb. 1) or ask me before/after recitation.

Citations -  If you researched your organism or another aspect of your report you must use in-text citations and include a bibliography.  The bibliography does not count toward your page limit.  Please note: you must use reputable sources (e.g, peer reviewed journals) and not websites such as Wikipedia!

If you do include a bibliography, please follow the Chicago Author-Date Style.  
A PDF explaining this citation style may be found here.    

Still unsure about good scientific experimental designs?
Visit this link and read the section titled "Experimentation as a scientific research method".

Field report formatting requirements for Laura's sections:
    1-3 pages, excluding citations. Reports more than 3 pages will not be read/graded!
    Double spaced
    12pt Times New Roman or Arial font
    1-inch margins
    Print double sided (preferred)
    Stapled
    Document header: student name and section #
    Document footer: page #

Last but not least: 
Use spell check and have someone proofread your field report!  
Yes, you will lose points for poor writing.
The below excerpt is from an article by Dustin Wax, entitled "The Value of Writing Well".
"Writing well is not a gift reserved for the few but a set of skills that can be learned by anyone. The technical aspects can be learned in any of several ways: by taking a class, by studying books on writing, by working with a partner or a group and acting on their feedback. But while grammar and structure are an important part of writing, to write well also demands some effort to develop style. Style is what keeps people reading past the first sentence..." 

Recitation study tip:
Look over the "Autecology - Glossary of Terms" in your packet. Try highlighting or putting a mark next to words that sound familiar.  Revisit this glossary in a week and see if you can highlight any more words.  This brief study method should help you prepare for your recitation QUIZ is on Feb. 6 or 7.  By the time you have your quiz, all of the words in your packet will be highlighted/checked!

Thursday, January 26, 2012

Natural Selection and Speciation

In this post, I will briefly outline some of the terminology and concepts discussed in Dr. Ehrenfeld's lecture and in the assigned Mayr and Diamond reading.  This post is not exhaustive and will not substitute your personal notes, but will provide some resources/visuals for understanding key terms and concepts (Source: Evolution 101).

Important Scientists:
   Charles Darwin (Origin of Species, 1859) & Alfred Russell Wallace 
   The Biological Species Concept (BSC) is one way to define a species.
   Speciation: how do new species evolve? (this hyperlink has great visuals)
  

Allopatric speciation
Dichopatric speciation (geographic isolation)
Peripatric speciation ("founder effect") 












Sympatric speciation  
Sympatric speciation
Parapatric speciation 















Natural Selection, Speciation & Evolution Examples

Adaptive Radiation & Galapagos finches



Convergent Evolution


The above salamanders are a classic example of a ring species.

Tuesday, January 24, 2012

J.X. and Circadian Rythum

During my recitation sections this week, students raised interesting questions regarding the case study of J.X., presented to our class in lecture on Monday (Miles et al., 1977).  If you wish to read the original article, Rutgers' students may access it through JSTOR.

Here are the results from research (Sack et al., 2007) into the topic, with respect to (some) of my students' questions:
  • Yes, circadian rhythm sleep disorders (CRSDs), may change as a person ages.  
  • No, CRSDs do not only affect the blind, but the free-running disorder is common in people who are totally blind.  It should be noted that for humans and many other organisms, sunlight is the most important circadian cue.
  • Research suggests that gender may affect susceptibility to, and severity of certain CRSDs.
  • Recent genetic research has linked "clock gene" mutations to families exhibiting a predisposition to CRSDs (i.e., heritable trait).  

For reference, a "normal" circadian cycle (Image source: Wikimedia Commons)


Works cited (Note: Students, do not follow this blog's citation formatting):

Miles, L. E. M.,  Raynal, D. M.,  Wilson, M. A.  1977.  Blind Man Living in Normal Society Has Circadian Rhythms of 24.9 Hours.  Science 198: 421-423.
Sack, R., Auckley, D., Auger, R.R., Carskadon, M.A., Wright, K.P., Vitiello, M.V., Zhdanova, I.V.  2007.  Circadian rhythm sleep disorders: Part II, advanced sleep phase disorder, delayed sleep phase disorder, free-running disorder, and irregular sleep-wake rhythm. SLEEP 30(11): 1484-1501.

Week 2 Recap

This week in recitation we discussed... 
  • Course expectations (mine and yours)
  • Course Packet (order one if you have not done so!)
  • Content and questions from Dr. Ehrenfeld's first two lectures
  • Field Report 1 (Due in lecture Thursday, February 2)
Within the next week and half, you have a lot to do!  

To help you prepare, please do the following:  
 
1) Visit my webpage: Understanding Scientific Articles. 
      Read, and preferably print out, "How to read and interpret a graph" 
      Review at least one of the resources about how to approach reading.

2) Read your field report directions and begin observing possible subjects.  
      By next recitation, you should have identified your organism, hypothesis,   
      and experimental design.

3) Read and be prepared to discuss in recitation these papers from the Packet:
      The Problem With Speciation by E. Myr & J. Diamond
          * Review speciation terms/concepts at Berkeley's Evolution 101 website.

      Attraction of kestrels to vole scent marks in ultraviolet light by Viitala et al.
          * Reviewing (1) will help you identify/understand the experimental design & results.    

Monday, January 16, 2012

Welcome to the blog for Laura's Principles of Ecology recitation students!

This blog is geared towards students enrolled in Laura's Monday and Tuesday recitation sections, however, students from all sections are welcome to use it as a resource.
 
What to look for and expect in the coming semester...
  • Links to helpful resources and difficult topics.
  • Some recitation assignments for Laura's sections will be submitted via this blog.
  • Sign up to recieve email alerts of new blog postings (right sidebar).
  • Review the calendar for important dates.
This week's homework assignment?  Order the required Principles of Ecology 2012 Packet at UPublishing.com