Brian
Brian J. Torreano - Owner
BTDarters
Your on-line resource for American Darters and other native fish for the
small to medium-sized aquarium!
Web: http://www.btdarters.com
Phone: (262) 268-7489
--- Original message ----
>------------------------------
>
>Date: Thu, 29 Sep 2005 08:34:30 -0400
>From: "Todd D. Crail" <tcrail at UTNet.UToledo.Edu>
>Subject: NANFA-L-- Diversity Indicies
>
>Hi gang,
>
>I'm trying to illustrate diversity using the good ol' Shannon, Simpson,
>etc.
>While they're working out pretty well, I think I can take my data a step
>further if there's an index that weights the presence of certain species.
>
>For example:
>
>I might sample Langenderfer Ditch where I caught 52 bluntnose minnows, 15
>redfin shiners, 23 johnny darters and 10 orangethroat darters.
>
>I might then go to the Tippecanoe River and sample 52 bigeye chub, 15
>hogsucker, 23 bluebreast and 10 spotted darter.
>
>Ignoring the fact that these would never be replicates as this is a quick,
>pre-coffee illustration... :)
>
>My current indicies would score these sites the same. I believe there is >a
>little more information in this data however.
>
>Is there an index that places weight on certain species? I've caught >rumor
>of such things (mainly concerning plant heritage data through TNC), I
>wondered if anything existed for our fishes?
>
>Thanks!
>Todd
>It's never too late to have a happy childhood.
>http://www.farmertodd.com
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/ This is the discussion list of the North American Native Fishes
/ Association (NANFA). Comments made on this list do not necessarily
/ reflect the beliefs or goals of NANFA. For more information about NANFA,
/ visit http://www.nanfa.org Please make sure all posts to nanfa-l are
/ consistent with the guidelines as per
/ http://www.nanfa.org/guidelines.shtml To subscribe, unsubscribe, or get
/ help, visit the NANFA email list home page and archive at
/ http://www.nanfa.org/email.shtml