Catostomus warnerensis

Scientific Name:Catostomus warnerensis
Common name:Warner sucker
Rank and Status   
Global Rank:G1 Native Status:Native
Subnational (State) Rank:S1 Endemic:No
US ESA Status:Listed threatened Sand Dunes:No
NNHP Tracking Status:At-Risk List Wetland:Yes
Other Agency Status Status Last Updated Status Comments
Bureau of Land Management - Nevada Dropped, no longer of concern BLM 2011 list; not included on 2017 list
State of Nevada Protected Protected Fish NAC 503.065.1
Nevada Wildlife Action Plan - 2012 Species of Conservation Priority
CCVI Score Moderately Vulnerable Conf. Mod.; Factors contributing to increased vulnerability are natural barriers and historical and physiological hydrological niche.
Distribution (NV Counties)

Status: Confident or certain

Summary Occurrence Data
Occurrence Count:1
Total Observed Area (hectares):Not Available
Maximum Known Elevation (m):Not available
Minimum Known Elevation (m):1512
Catostomus warnerensis data at NatureServe
Catostomus warnerensis photos and data at Encyclopedia of Life
Character Abstract
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Habitat Comments:Historically abundant and widely distributed in the basin, the Warner sucker still maintains sizable numbers in a few habitats. It is still known to occur in most lakes, sloughs, and potholes, except during drought years. Stream resident populations are found in Honey and Twentymile creeks and tributaries (including Twelvemile Cr. in NV). In most habitats the Warner sucker is rare, although aggregations of spawning adults or young-of-the-year may be encountered. The Warner sucker inhabits the lakes and low gradient stream reaches of the Warner Valley. The metapopulation of Warner suckers is comprised of two life history forms: lake and stream morphs (Scheerer 2009). Larvae are found in shallow backwater pools or on stream margins where there is no current, often among or near macrophytes (aquatic plants). Young-of-the-year use deep still pools, but also move into faster flowing areas near the heads of pools. Adults use stretches of stream where the gradient is low enough to allow the formation of long, >50 meters (>164 feet), pools. These pools tend to have undercut banks, large beds of aquatic macrophytes, root wads or boulders, a vertical temperature differential of at least 2º C (35.6º F), a maximum depth >1.5 meters (>5 feet), and over-hanging vegetation (Richardson 2009).
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