Document Detail


Natural flow regimes, nonnative fishes, and native fish persistence in arid-land river systems.
MedLine Citation:
PMID:  18686584     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Escalating demands for water have led to substantial modifications of river systems in arid regions, which coupled with the widespread invasion of nonnative organisms, have increased the vulnerability of native aquatic species to extirpation. Whereas a number of studies have evaluated the role of modified flow regimes and nonnative species on native aquatic assemblages, few have been conducted where the compounding effects of modified flow regimes and established nonnatives do not confound interpretations, particularly at spatial and temporal scales that are relevant to conservation of species at a range-wide level. By evaluating a 19-year data set across six sites in the relatively unaltered upper Gila River basin, New Mexico, USA, we tested how natural flow regimes and presence of nonnative species affected long-term stability of native fish assemblages. Overall, we found that native fish density was greatest during a wet period at the beginning of our study and declined during a dry period near the end of the study. Nonnative fishes, particularly predators, generally responded in opposite directions to these climatic cycles. Our data suggested that chronic presence of nonnative fishes, coupled with naturally low flows reduced abundance of individual species and compromised persistence of native fish assemblages. We also found that a natural flow regime alone was unlikely to ensure persistence of native fish assemblages. Rather, active management that maintains natural flow regimes while concurrently suppressing or excluding nonnative fishes from remaining native fish strongholds is critical to conservation of native fish assemblages in a system, such as the upper Gila River drainage, with comparatively little anthropogenic modification.
Authors:
David L Propst; Keith B Gido; Jerome A Stefferud
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Ecological applications : a publication of the Ecological Society of America     Volume:  18     ISSN:  1051-0761     ISO Abbreviation:  Ecol Appl     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-08-08     Completed Date:  2008-11-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889808     Medline TA:  Ecol Appl     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1236-52     Citation Subset:  IM    
Affiliation:
Conservation Services Division, New Mexico Department of Game and Fish, Santa Fe, New Mexico 87504, USA. david.propst@state.nm.us
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MeSH Terms
Descriptor/Qualifier:
Animals
Fishes*
Rivers*
Water Supply*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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