Methods used here are described in:
Jeffrey C. Johnson, Stephen P. Borgatti, Joseph J. Luczkovich, and Martin G. Everett.  2001.  Network Role Analysis in the
Study of Food Webs: An Application of Regular Role Coloration. Journal of Social Structure, Vol. 2, No. 3, May 8, 2001.
(note this is an on-line peer-reviewed journal)

Aquatic Systems

• St. Marks, Florida, Halodule seagrass bed (Baird, Luczkovich and Christian 1998; Christian and Luczkovich 1999)
• Chesapeake Bay (Baird and Ulanowicz 1989)
• Crystal River, Florida (Hirata and Ulanowicz 1985)
• Mukkaw Bay, Washington (Paine 1966)

• Luquillo Rainforest, Puerto Rico (Regan and Waide 1995)
• Coachella Valley Desert, California (Polis 1996)
• Norwegian Food Web for Humans (Bakken and Blekken 1999)