Food availability and growth rate in natural populations of the brown trout ( Salmo trutta ) in Corsican streams
Identifieur interne : 002324 ( Main/Exploration ); précédent : 002323; suivant : 002325Food availability and growth rate in natural populations of the brown trout ( Salmo trutta ) in Corsican streams
Auteurs : Remi Chappaz [France] ; Georges Olivart [France] ; Guy Brun [France]Source :
- Hydrobiologia [ 0018-8158 ] ; 1996.
Descripteurs français
- Wicri :
- topic : Corse.
English descriptors
- KwdEn :
Abstract
Abstract: The rivers of the island of Corsica, whose catchment areas are on crystalline rock, have low salt contents and their invertebrate fauna is qualitatively and quantitatively poorer than on the European mainland. The growth rate of trout in Corsica was analysed on samples from of six coastal rivers: the Tavignano, the Fium Orbo and the Golo on the west coast, the Prunelli, the Taravo and the Rizzanese on the east coast. Mesological data — conductivity, temperature, calcium content and altitude and biological data — biomass and linear growth rate of the trout, and density of benthic invertebrates — were collected at each of the sampling station. Analysis of variance of the size of three year old trout revealed three groups of rivers. The first includes the Tavignano, the Rizzanese and the Taravo, where the highest linear growth rates were recorded; the second consists of the Golo and the Prunelli, and the third, of the Fium Orbo. Principal component analysis gave two main axes on the basis of temperature and benthic invertebrate density for the first, and trout biomass for the second. Linear regression showed that benthic invertebrate density accounted for 75% of size variance of three year old trout. Evidence of the limiting role of the trophic factor is provided.
Url:
DOI: 10.1007/BF00025408
Affiliations:
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The growth rate of trout in Corsica was analysed on samples from of six coastal rivers: the Tavignano, the Fium Orbo and the Golo on the west coast, the Prunelli, the Taravo and the Rizzanese on the east coast. Mesological data — conductivity, temperature, calcium content and altitude and biological data — biomass and linear growth rate of the trout, and density of benthic invertebrates — were collected at each of the sampling station. Analysis of variance of the size of three year old trout revealed three groups of rivers. The first includes the Tavignano, the Rizzanese and the Taravo, where the highest linear growth rates were recorded; the second consists of the Golo and the Prunelli, and the third, of the Fium Orbo. Principal component analysis gave two main axes on the basis of temperature and benthic invertebrate density for the first, and trout biomass for the second. Linear regression showed that benthic invertebrate density accounted for 75% of size variance of three year old trout. Evidence of the limiting role of the trophic factor is provided.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Provence-Alpes-Côte d'Azur</li></region><settlement><li>Barjols</li><li>Marseille</li></settlement><orgName><li>Université de Provence</li></orgName></list><tree><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Chappaz, Remi" sort="Chappaz, Remi" uniqKey="Chappaz R" first="Remi" last="Chappaz">Remi Chappaz</name></region><name sortKey="Brun, Guy" sort="Brun, Guy" uniqKey="Brun G" first="Guy" last="Brun">Guy Brun</name><name sortKey="Olivart, Georges" sort="Olivart, Georges" uniqKey="Olivart G" first="Georges" last="Olivart">Georges Olivart</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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