[Ecoed] food web diagrams

[Liane Cochran-Stafira]

Hi Kristen,
I don't know if you have received any responses, but I'll chime 
in.  The arrows always (by convention) go from source to 
consumer.  So arrows would go from producers to the herbivores and 
from herbivores to the predators.  In food webs, this convention is 
retained - from food species to its consumer.  The arrows are 
tracking energy (and matter) flow.

Liane

At 06:14 AM 3/15/2007, Kristen Lennon wrote:
>Hi,
>
>I have a very simple question regarding the structure of "typical" food
>web diagrams that I would like you to weigh in on so that I can have a
>consensus. I'm working at the K-12 level, specifically at the middle
>school level at the moment, to give you some idea as to from where I'm
>coming. My understanding is that the arrows in food web diagrams always
>go from producer to consumer and  prey to predator; showing the flow of
>food from one organism to another. In my work, I have found that
>students (and even some of my colleagues) tend to think that the arrows
>should be reversed. Before I dismiss that as incorrect, I need some of
>you to weigh in.
>
>I appreciate your input. Feel free to respond to the list server or to
>me directly.
>
>Many thanks,
>Kristen
>
>Kristen A. Lennon, Ph.D.
>Research Associate
>Project 2061
>American Association for the Advancement of Science
>1200 New York Ave., NW
>Washington, DC 20005 USA
>
>
>Tel:202-326-7032
>E-mail: klennon at aaas.org
>http://project2061.aaas.org
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***************************
Liane Cochran-Stafira, Ph.D.
Associate Professor
Department of Biology
Saint Xavier University
3700 West 103rd Street
Chicago, Illinois  60655

phone:  773-298-3514
fax:    773-298-3536
email:  cochran at sxu.edu
http://faculty.sxu.edu/~cochran/


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