Status of the Topeka shiner in west-central Iowa

American Midland Naturalist
By: , and 

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Abstract

The Topeka shiner Notropis topeka is a federally endangered fish species that is estimated to occupy only 20% of its historic range. In Iowa Topeka shiners have been in decline for decades. Our goal was to determine the present distribution of Topeka shiners in the west-central portion of their range in Iowa and to characterize the extent of its decline. We compared the current distribution to distributions generated from earlier collections. We found Topeka shiners in six of 22 watersheds where they occurred historically. Status of Topeka shiners was judged to be stable in 27% of the watersheds, at risk in 45% of the watersheds, and possibly extirpated in 27% of the watersheds. None were classified as increasing. Based on comparison of the historical distribution with more recent ones, Topeka shiners in west-central Iowa showed a 27% decline a decade ago and currently exhibits a 73% decline in their distribution. The collective evidence from four of five other states in the species’ range reveals similar declines. This study provides further information on the local distribution and extent of decline for this federally endangered species with a greatly reduced and fragmented overall distribution.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Status of the Topeka shiner in west-central Iowa
Series title American Midland Naturalist
DOI 10.1674/0003-0031-174.2.350
Volume 174
Issue 2
Year Published 2015
Language English
Publisher Bioone
Contributing office(s) Coop Res Unit Leetown
Description 9 p.
First page 350
Last page 358
Online Only (Y/N) N
Additional Online Files (Y/N) N