Filters: partyWithName: Birchell, Garn J (X) > Types: Citation (X)
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Floodplains are presumed to be important rearing habitat for the endangered razorback sucker (Xyrauchen texanus). To help recover this endemic Colorado River Basin species, the Upper Colorado River Endangered Fish Recovery Program implemented a floodplain acquisition and enhancement program. Levee removal was initiated in 1996 as one component of this floodplain restoration program. The goal of the Levee Removal Study was to evaluate the system responses to levee removal and make specific recommendations concerning the value of floodplain/river reconnecting for endangered species (specifically razorback sucker) recovery.
Categories: Publication;
Types: Citation;
Tags: Green River,
age-1,
flood,
floodplain depressions,
flows,
Despite successful reproduction by razorback suckers (Xyrauchen texanus) in the middle Green River, recruitment beyond the larval stage has not been recently observed. Bonytail (Gila elegans) are essentially extirpated in the wild and nearly all bonytail present in the Green River are hatchery-stocked fish. Floodplain wetlands may provide important rearing habitat for both larval razorback sucker and bonytail. However, survival of razorback suckers in restored floodplain habitat has not been observed since 1997, even when larvae were introduced directly into floodplain sites. Large nonnative fish populations in floodplain habitats have likely suppressed survival. The recent drought eliminated, or reset, nonnative...
Categories: Publication;
Types: Citation;
Tags: Green River,
bonytail,
endangered species,
floodplain wetland,
larval,
Adults and larvae of razorback sucker were sampled in the Green River Basin, Utah and Colorado, from 1996 to 1999 to assess their status and monitor population trends. Data from other studies and years were added to enhance the strength of the relatively sparse data set. The wild adult population in the middle Green River, Utah, from 1985 to 1992 was small at about 300 to 600 adults but recruitment was thought sufficient to replace annual mortality. Sampling since 1992 indicated that wild razorback suckers remained in a large portion of the Green River, including the lower Yampa River and the middle and lower Green River. Negligible change in total length (TL) of razorback suckers in the middle Green River, based...
Categories: Publication;
Types: Citation
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