Using commercial catch statistics to detect habitat bottlenecks in large lowland rivers
Identifieur interne : 000257 ( Istex/Corpus ); précédent : 000256; suivant : 000258Using commercial catch statistics to detect habitat bottlenecks in large lowland rivers
Auteurs : Christian Wolter ; Ronald MenzelSource :
- River Research and Applications [ 1535-1459 ] ; 2005-02.
English descriptors
- KwdEn :
Abstract
Thirty‐seven years of fisheries records covering a fishing area of 6231 ha in the lower Havel River, Germany, have been analysed to address two issues: (1) detection of the effects of habitat bottlenecks caused by extreme floods and droughts on adult fish assemblage; and (2) evaluating the appropriateness of commercial fisheries statistics in testing the habitat bottleneck concept. Time series analyses of the data were first tested for autocorrelations and then classified using the CHAID (Chi‐squared Automatic Interaction Detector) and C&RT (Classification and Regression Trees) algorithms. The significant environmental predictors revealed by these segmentation procedures were used in cross‐correlations with various time series of fisheries yields. No single hydraulic flood parameter was significantly correlated with fisheries yield but two drought parameters were. The strongest predictor of native fish species was the minimum discharge during the spawning season (March to June). Although total fisheries yield typically increased in years with low flows, probably because of higher catch efficiencies, the yields of pike and pikeperch significantly decreased in the following two years. By comparison, significantly higher catches of pike, perch, asp, burbot, and ide were recorded in the three years following periods of sustained higher base flows. Our findings suggest that habitat bottleneck effects on fish assemblages have an important role in influencing fish community structure and do require further study. Information on habitat bottlenecks will contribute to the setting of ecological flow requirements and sustainable fisheries in large rivers systems. Copyright © 2005 John Wiley & Sons, Ltd.
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DOI: 10.1002/rra.844
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ISTEX:AB9DEEDA79CA47700287F3619784DF120346B8BALe document en format XML
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Time series analyses of the data were first tested for autocorrelations and then classified using the CHAID (Chi‐squared Automatic Interaction Detector) and C&RT (Classification and Regression Trees) algorithms. The significant environmental predictors revealed by these segmentation procedures were used in cross‐correlations with various time series of fisheries yields. No single hydraulic flood parameter was significantly correlated with fisheries yield but two drought parameters were. The strongest predictor of native fish species was the minimum discharge during the spawning season (March to June). Although total fisheries yield typically increased in years with low flows, probably because of higher catch efficiencies, the yields of pike and pikeperch significantly decreased in the following two years. By comparison, significantly higher catches of pike, perch, asp, burbot, and ide were recorded in the three years following periods of sustained higher base flows. Our findings suggest that habitat bottleneck effects on fish assemblages have an important role in influencing fish community structure and do require further study. Information on habitat bottlenecks will contribute to the setting of ecological flow requirements and sustainable fisheries in large rivers systems. Copyright © 2005 John Wiley & Sons, Ltd.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Christian Wolter</name><affiliations><json:string>Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, 12561 Berlin, Germany</json:string></affiliations></json:item><json:item><name>Ronald Menzel</name><affiliations><json:string>Fischereischutzgenossenschaft “Havel” Brandenburg e.G., 14774 Brandenburg, Germany</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>fish assemblage</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>large river</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>lowland river</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>habitat bottleneck concept</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>minimum flow</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>fisheries statistics</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>time series</value></json:item></subject><language><json:string>eng</json:string></language><abstract>Thirty‐seven years of fisheries records covering a fishing area of 6231 ha in the lower Havel River, Germany, have been analysed to address two issues: (1) detection of the effects of habitat bottlenecks caused by extreme floods and droughts on adult fish assemblage; and (2) evaluating the appropriateness of commercial fisheries statistics in testing the habitat bottleneck concept. Time series analyses of the data were first tested for autocorrelations and then classified using the CHAID (Chi‐squared Automatic Interaction Detector) and C&RT (Classification and Regression Trees) algorithms. The significant environmental predictors revealed by these segmentation procedures were used in cross‐correlations with various time series of fisheries yields. No single hydraulic flood parameter was significantly correlated with fisheries yield but two drought parameters were. The strongest predictor of native fish species was the minimum discharge during the spawning season (March to June). Although total fisheries yield typically increased in years with low flows, probably because of higher catch efficiencies, the yields of pike and pikeperch significantly decreased in the following two years. By comparison, significantly higher catches of pike, perch, asp, burbot, and ide were recorded in the three years following periods of sustained higher base flows. Our findings suggest that habitat bottleneck effects on fish assemblages have an important role in influencing fish community structure and do require further study. Information on habitat bottlenecks will contribute to the setting of ecological flow requirements and sustainable fisheries in large rivers systems. 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Time series analyses of the data were first tested for autocorrelations and then classified using the CHAID (Chi‐squared Automatic Interaction Detector) and C&RT (Classification and Regression Trees) algorithms. The significant environmental predictors revealed by these segmentation procedures were used in cross‐correlations with various time series of fisheries yields. No single hydraulic flood parameter was significantly correlated with fisheries yield but two drought parameters were. The strongest predictor of native fish species was the minimum discharge during the spawning season (March to June). Although total fisheries yield typically increased in years with low flows, probably because of higher catch efficiencies, the yields of pike and pikeperch significantly decreased in the following two years. By comparison, significantly higher catches of pike, perch, asp, burbot, and ide were recorded in the three years following periods of sustained higher base flows. Our findings suggest that habitat bottleneck effects on fish assemblages have an important role in influencing fish community structure and do require further study. Information on habitat bottlenecks will contribute to the setting of ecological flow requirements and sustainable fisheries in large rivers systems. 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and (2) evaluating the appropriateness of commercial fisheries statistics in testing the habitat bottleneck concept. Time series analyses of the data were first tested for autocorrelations and then classified using the CHAID (Chi‐squared Automatic Interaction Detector) and C&RT (Classification and Regression Trees) algorithms. The significant environmental predictors revealed by these segmentation procedures were used in cross‐correlations with various time series of fisheries yields. No single hydraulic flood parameter was significantly correlated with fisheries yield but two drought parameters were. The strongest predictor of native fish species was the minimum discharge during the spawning season (March to June). Although total fisheries yield typically increased in years with low flows, probably because of higher catch efficiencies, the yields of pike and pikeperch significantly decreased in the following two years. By comparison, significantly higher catches of pike, perch, asp, burbot, and ide were recorded in the three years following periods of sustained higher base flows. Our findings suggest that habitat bottleneck effects on fish assemblages have an important role in influencing fish community structure and do require further study. Information on habitat bottlenecks will contribute to the setting of ecological flow requirements and sustainable fisheries in large rivers systems. Copyright © 2005 John Wiley & Sons, Ltd.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Using commercial catch statistics to detect habitat bottlenecks in large lowland rivers</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>HABITAT BOTTLENECKS IN LOWLAND RIVERS</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Using commercial catch statistics to detect habitat bottlenecks in large lowland rivers</title></titleInfo><name type="personal"><namePart type="given">Christian</namePart><namePart type="family">Wolter</namePart><affiliation>Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, 12561 Berlin, Germany</affiliation><description>Correspondence: Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, 12561 Berlin, Germany.</description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Ronald</namePart><namePart type="family">Menzel</namePart><affiliation>Fischereischutzgenossenschaft “Havel” Brandenburg e.G., 14774 Brandenburg, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article">article</genre><originInfo><publisher>John Wiley & Sons, Ltd.</publisher><place><placeTerm type="text">Chichester, UK</placeTerm></place><dateIssued encoding="w3cdtf">2005-02</dateIssued><dateValid encoding="w3cdtf">2004-07-21</dateValid><copyrightDate encoding="w3cdtf">2005</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">6</extent><extent unit="tables">2</extent><extent unit="references">53</extent></physicalDescription><abstract lang="en">Thirty‐seven years of fisheries records covering a fishing area of 6231 ha in the lower Havel River, Germany, have been analysed to address two issues: (1) detection of the effects of habitat bottlenecks caused by extreme floods and droughts on adult fish assemblage; and (2) evaluating the appropriateness of commercial fisheries statistics in testing the habitat bottleneck concept. Time series analyses of the data were first tested for autocorrelations and then classified using the CHAID (Chi‐squared Automatic Interaction Detector) and C&RT (Classification and Regression Trees) algorithms. The significant environmental predictors revealed by these segmentation procedures were used in cross‐correlations with various time series of fisheries yields. No single hydraulic flood parameter was significantly correlated with fisheries yield but two drought parameters were. The strongest predictor of native fish species was the minimum discharge during the spawning season (March to June). Although total fisheries yield typically increased in years with low flows, probably because of higher catch efficiencies, the yields of pike and pikeperch significantly decreased in the following two years. By comparison, significantly higher catches of pike, perch, asp, burbot, and ide were recorded in the three years following periods of sustained higher base flows. Our findings suggest that habitat bottleneck effects on fish assemblages have an important role in influencing fish community structure and do require further study. Information on habitat bottlenecks will contribute to the setting of ecological flow requirements and sustainable fisheries in large rivers systems. Copyright © 2005 John Wiley & Sons, Ltd.</abstract><subject lang="en"><genre>Keywords</genre><topic>fish assemblage</topic><topic>large river</topic><topic>lowland river</topic><topic>habitat bottleneck concept</topic><topic>minimum flow</topic><topic>fisheries statistics</topic><topic>time series</topic></subject><relatedItem type="host"><titleInfo><title>River Research and Applications</title></titleInfo><titleInfo type="abbreviated"><title>River Res. 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