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The impact of trophic changes over 45 years on the Eurasian perch, Perca fluviatilis, population of Lake Geneva

Published online by Cambridge University Press:  23 October 2008

Jean-Paul Dubois ,
Christian Gillet ,
Nadine Hilgert  and
Gérard Balvay
Jean-Paul Dubois
Affiliation:
INRA, UMR CARRTEL, Centre Alpin de Recherche sur les Réseaux Trophiques des Ecosystèmes Limniques, 75 avenue de Corzent, BP 511, 74203 Thonon-les-Bains Cedex, France
Christian Gillet
Affiliation:
INRA, UMR CARRTEL, Centre Alpin de Recherche sur les Réseaux Trophiques des Ecosystèmes Limniques, 75 avenue de Corzent, BP 511, 74203 Thonon-les-Bains Cedex, France
Nadine Hilgert
Affiliation:
UMR Analyse des Systèmes et Biométrie, ENSAM–INRA, 2 place Pierre Viala, 34060 Montpellier Cedex 1, France
Gérard Balvay
Affiliation:
INRA, UMR CARRTEL, Centre Alpin de Recherche sur les Réseaux Trophiques des Ecosystèmes Limniques, 75 avenue de Corzent, BP 511, 74203 Thonon-les-Bains Cedex, France
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Abstract

The change in catches and mean size of one-year-old perch (Perca fluviatilis) in Lake Geneva was studied between 1957 and 2005, and related to trophic changes and average temperature. The status of Lake Geneva, assessed on the basis of total phosphorus concentrations, switched from being oligotrophic before 1960 to eutrophic, with total phosphorus concentration reaching nearly 90 µg L−1 in 1976-1979. In response to management measures, the trophic status then returned to mesotrophy in the early 2000s. Zooplankton is the main food consumed by young perch, and quantities present (annual biovolumes of zooplankton) were recorded throughout the study period. The lake water temperature was also recorded. Data obtained from perch catches and perch spawns enabled eleven strong cohorts of perch to be identified. Strong cohorts dominated the stock for three years, until they were massively caught by fishermen. Yields have fluctuated widely, increasing rapidly until 1975, and subsequently decreasing, with an exceptional decline between 1976 and 1981. During the period 1977-1981, unfavourable climatic conditions in spring were probably the main cause of this fall in perch yields. For the other periods, perch yields and the mean size of one-year-old perch were significantly correlated with trophic parameters, total phosphorus concentration and zooplankton biovolume. Correlations are higher if only strong cohorts are taken into account. As a result of the re-oligotrophication process, perch growth has been progressively reduced, age at first maturity delayed and strong cohorts become less frequent; the mean size of 0+ individuals in strong cohorts is significantly smaller than in the other cohorts, suggesting a population density effect in the context of a limited supply of zooplankton. During the study period, trophic changes in Lake Geneva have had more impact on perch growth and yield than has temperature, since no significant correlation could be detected between water temperature and perch growth.

Keywords

Pre-Alpine lakeFishing yieldsGrowth Eutrophication Phosphorus Zooplankton Perca fluviatilis
Type
Research Article
Information
Aquatic Living Resources , Volume 21 , Issue 4 , October 2008 , pp. 401 - 410
Copyright
© EDP Sciences, IFREMER, IRD, 2008

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