Nom du corpus

Corpus Systématique Animale

Titre du document

Morphological variability in the ecotone — an important factor for the conservation of fish species richness in Swiss rivers

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • river morphology
  • ecotone
  • variability
  • fish fauna
  • threatened species
  • conservation
Nom du fichier dans la ressource
Poissons_v2b_004846
Auteur(s)
  • Arthur Kirchhofer
Affiliation(s)
  • Zoological Institute University of Bern, Baltzerstr 3, CH-3012, Bern, Switzerland
Résumé

Data from a survey on the distribution of fish species in Switzerland were used to test the hypothesis that species richness of the fish fauna is closely related with the structure, heterogeneity and complexity of the ecotonal zone in rivers. Species richness increased with increasing structural heterogeneity and variability of the ecotone in rivers wider than 2.5 m at altitudes below 500 m. In lowland brooks and in rivers at higher altitudes other factors seemed to be more important than morphological variability: alpine rivers are more often left natural than lowland rivers and salmonid stocking is more important in these naturally species poor fish communities. The proportion of threatened species was higher if riverbed and -banks were natural, the slope was flat, the variability in depths and sediment composition was high and if the ecotonal zone was well structured. Specialized species such as nase and riffle minnow only occurred in larger rivers, whereas in small and medium-sized rivers with low morphological variability these threatened species were missing. On the other hand, ubiquitous species such as chub, roach and perch, occurred in all sizes of rivers, even if morphological variability was small. Low morphological variability and its impact on the composition of the fish community is mainly a consequence of past human interventions. Therefore river management has to take into account the ecological requirements of specialized species and increasing the variability of riverbed and banks would considerably contribute to the conservation of endangered fish species.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - ecologie animale, vegetale et microbienne
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
Catégories WoS
  • 1 - science ; 2 - marine & freshwater biology
Identifiant ISTEX
6E0D048621938A12139E54F6E2410EBDC0718787
Revue

Hydrobiologia

Année de publication
1995
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
8.288
Sous-corpus
  • Poissons
Type de publication
Journal
ark:/67375/1BB-6L9PNNCB-8
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