Re: NANFA-- Topeka shiner decline and FW jelly expansion

Mark Otnes (markotnes_at_email.msn.com)
Fri, 7 Jun 2002 18:53:43 -0500

Thanks for the information on the Topeka Shiner. This is very interesting
and it makes sense to me. A few years back I almost left the computer world
and was going to go to graduate school for fisheries at the University of
Minnesota under Jay Hatch. The project I was going to work on was the
Topeka Shiner in southwest Minnesota Over several weeks we did a bunch of
collecting in the area and found them to be locally abundant. What really
struck me was that the habitat was often far from pristine where we would
find bucket loads of the fish. There was one farm pond where they were the
most abundant species.

The contention that the main problem the Topeka Shiner has is with
introduced species strikes a cord with my limited observations. Thanks for
the info.

Mark Otnes
Fargo ND

----- Original Message -----
From: "Hoover, Jan J ERDC-EL-MS" <HOOVERJ_at_wes.army.mil>
To: <nanfa_at_aquaria.net>
Cc: <adamsr_at_siu.edu>; <killgore at wes.army.mil>
Sent: Friday, May 31, 2002 3:45 PM
Subject: NANFA-- Topeka shiner decline and FW jelly expansion

> Two very interesting articles in the June 2002 issue of Journal of
> Freshwater Ecology:
>
> "Spatial and temporal species associations with the Topeka shiner(Notropis
> topeka)in Missouri," by Matthew R. Winston. This article uses fish data
> from 1938 to present to look at changes in distribution. Topeka shiner
> declined (along with 6 other species) and were negatively associated with
> three expanding species: blackstripe topminnow, bluegill, and largemouth
> bass. Unlike other declining species, Topekas retreated to smaller,
> high-gradient streams. Results did not support physical/chemical causes
for
> Topeka declines (e.g., agriculture, urbanization, sedimentation,
> channelization, etc.) but suggested biotic causes (e.g., predation,
> competition, introduced diseases).
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