LotaV3, Main, Exploration, bibRecord, 000903

Using commercial catch statistics to detect habitat bottlenecks in large lowland rivers

Identifieur interne : 000903 ( Main/Exploration ); précédent : 000902; suivant : 000904

Using commercial catch statistics to detect habitat bottlenecks in large lowland rivers

Auteurs : Christian Wolter (biologiste) [Allemagne] ; Ronald Menzel [Allemagne]

Source :

River Research and Applications [ 1535-1459 ] ; 2005-02.

RBID : ISTEX:AB9DEEDA79CA47700287F3619784DF120346B8BA

Descripteurs français

Pascal (Inist)
- Analyse statistique, Capture, Communauté animale, Goulot étranglement, Habitat, Pêcherie, Rivière, Régularisation cours eau, Série temporelle, Zone basse.
Wicri :
- topic : Habitat.

English descriptors

KwdEn :
- Animal community, Bottleneck, Capture, Fishery, Habitat, Lowland, Riverflow control, Rivers, Statistical analysis, Time series, fish assemblage, fisheries statistics, habitat bottleneck concept, large river, lowland river, minimum flow, time series.

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.

Url:

https://api.istex.fr/document/AB9DEEDA79CA47700287F3619784DF120346B8BA/fulltext/pdf

DOI: 10.1002/rra.844

Affiliations:

Le document en format XML

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<front><div type="abstract" xml: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.</div>
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Using commercial catch statistics to detect habitat bottlenecks in large lowland rivers

Using commercial catch statistics to detect habitat bottlenecks in large lowland rivers

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

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