Nom du corpus

Corpus Systématique Animale

Titre du document

Decline in zoobenthos densities in the profundal sediments of Lake Mendota (Wisconsin, USA)

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • zoobenthos
  • profundal
  • Lake Mendota
  • Chaoborus
  • Chironomus
  • Pisidium
  • Oligochaeta
  • Procladius
Nom du fichier dans la ressource
Poissons_v2b_004033
Auteur(s)
  • R. C. Lathrop
Affiliation(s)
  • Wisconsin Department Natural Resources, Bureau of Research, 53711, Madison, WI, USA
Résumé

High densities of zoobenthos inhabited Lake Mendota's profundal zone in the early 1900s through the mid-1940s. Chaoborus punctipennis was the most abundant organism during the winter, along with moderate densities of Chironomus spp., Pisidium sp., oligochaetes, and Procladius sp. By the early 1950s, Chaoborus punctipennis densities had declined to 10% of former levels, while Chironomus increased significantly. However, by the mid-1960s, Chaoborus, Chironomus, and Pisidium densities had decreased to very low population levels. By 1987–89, Pisidium was no longer found. Zoobenthos that had not decreased from earlier surveys were oligochaetes and Procladius, although further sampling of oligochaetes is needed to confirm current densities. These organisms are the most tolerant of severe anoxia. Four possible reasons for this decline were evaluated: (a) decline in food availability, (b) increase in fish predation, (c) use of toxic insecticides in the drainage basin, and (d) changes in the profundal sediment environment. Based on literature information and long-term data for Lake Mendota, a change in the profundal sediment environment is the most likely explanation for the decline in the less-tolerant zoobenthos species. Although the duration and extent of anoxia in the hypolimnion have not changed since the early 1900s, hypolimnetic ammonia and hydrogen sulfide concentrations apparently have increased as Mendota became more eutrophic after the mid-1940s. However, further study is needed to determine if these higher concentrations or other factors were responsible for the dramatic decline in lake Mendota's profundal zoobenthos.

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
702DDE6A2307AC2A116E0346B4C8D9198B650337
Revue

Hydrobiologia

Année de publication
1992
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.384
Sous-corpus
  • Poissons
Type de publication
Journal
ark:/67375/1BB-0NVTPB5X-B
Powered by Lodex 9.3.8