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Corpus Systématique Animale

Titre du document

Temporal variations of fossil Cladocera in the sediments of Lake Orta (N. Italy) over the last 400 years

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Springer (journals)
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Mots-clés d'auteur
  • Cladocera remains
  • paleolimnology
  • climate
  • pollution
  • human impact
  • Italy
Nom du fichier dans la ressource
  • M. Manca 1
  • P. Comoli 1
  • 1) C.N.R. Istituto Italiano di Idrobiologia, Largo Tonolli 50–52, 28048, Pallanza, Italy

We use Cladocera remains in the sediments to reconstruct the longterm history of Lake Orta, a lake which experienced severe pollution from copper and ammonium sulphate, and started to recover during the last 15 years. Both human and natural impacts were detected over almost 400 years. Pollution was manifested by a dramatic decrease in the number of remains, in the planktonic/littoral (P/L) ratio, and in chydorid species diversity. Most species, even those most tolerant to stress, disappeared. The recolonization of biota was initially sustained by one species of chydorid,Chydorus sphaericus, which had a three-fold increase at the beginning of the 1980s, when studies on plankton recorded the development of a pelagic population. This fact, and the appearance in the sediments ofAlona quadrangularis, attest to the development of filamentous algae which was reported in studies on the plankton. The colonization of the lake by pelagic species came only in the last twelve years and was manifested also as a stabilization of the P/L ratio. Two other periods of disturbance were detected in the sediments: the first, at the end of the 19th century, was related to the introduction of exotic fish species; the second occurred during the second half of the 17th century. This event probably cannot be ascribed to human impact, but may be related to a decrease in temperature in that period (the Maunder Minimum).

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - earth & environmental sciences
  • 3 - paleontology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Earth-Surface Processes
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
Catégories WoS
  • 1 - science ; 2 - limnology
  • 1 - science ; 2 - geosciences, multidisciplinary
  • 1 - science ; 2 - environmental sciences
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Journal of Paleolimnology

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