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Habitat suitability of the Carolina madtom, an imperiled, endemic stream fish

Transactions of the American Fisheries Society

State Wildlife Grant through the NCWRC; North Carolina State University; U.S. Fish and Wildlife Service; Wildlife Management Institute
By:
, , and
DOI:10.1577/T08-238.1

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Abstract

The Carolina madtom Noturus furiosus is an imperiled stream ictalurid that is endemic to the Tar and Neuse River basins in North Carolina. The Carolina madtom is listed as a threatened species by the state of North Carolina, and whereas recent distribution surveys have found that the Tar River basin population occupies a range similar to its historical range, the Neuse River basin population has shown recent significant decline. Quantification of habitat requirements and availability is critical for effective management and subsequent survival of the species. We investigated six reaches (three in each basin) to (1) quantify Carolina madtom microhabitat use, availability, and suitability; (2) compare suitable microhabitat availability between the two basins; and (3) examine use of an instream artificial cover unit. Carolina madtoms were located and their habitat was quantified at four of the six survey reaches. They most frequently occupied shallow to moderate depths of swift moving water over a sand substrate and used cobble for cover. Univariate and principal components analyses both showed that Carolina madtom use of instream habitat was selective (i.e., nonrandom). Interbasin comparisons suggested that suitable microhabitats were more prevalent in the impacted Neuse River basin than in the Tar River basin. We suggest that other physical or biotic effects may be responsible for the decline in the Neuse River basin population. We designed instream artificial cover units that were occupied by Carolina madtoms (25% of the time) and occasionally by other organisms. Carolina madtom abundance among all areas treated with the artificial cover unit was statistically higher than that in the control areas, demonstrating use of artificial cover when available. Microhabitat characteristics of occupied artificial cover units closely resembled those of natural instream microhabitat used by Carolina madtoms; these units present an option for conservation and restoration if increased management is deemed necessary. Results from our study provide habitat suitability criteria and artificial cover information that can inform management and conservation of the Carolina madtom.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Habitat suitability of the Carolina madtom, an imperiled, endemic stream fish
Series title:
Transactions of the American Fisheries Society
DOI:
10.1577/T08-238.1
Volume:
139
Issue:
2
Year Published:
2010
Language:
English
Publisher:
American Fisheries Society
Publisher location:
Bethesda, MD
Contributing office(s):
Coop Res Unit Atlanta
Description:
14 p.
First page:
325
Last page:
338
Online Only (Y/N):
N
Additional Online Files (Y/N):
N