L’ANGUILLA EUROPEA NEL BACINO IDROGRAFICO MARTA-BOLSENA VALUTAZIONI PRELIMINARI DI COLONIZZAZIONE ED EMIGRAZIONE AI FINI DELLA GESTIONE PER LA SALVAGUARDIA DELLA BIODIVERSITÁ

Autor: Leone, C, Capoccioni, F, Bevacqua, D, Ciccotti, E
Jazyk: italština
Rok vydání: 2010
Předmět:
THE EUROPEAN EEL (ANGUILLA ANGUILLA
L. 1758) IS A PANMICITIC SPECIES
WITH IMPORTANT SCIENTIFIC AND ECONOMIC VALUES
FOR WHICH A URGENT CONSERVATION ISSUE EXISTS SINCE ITS ENTIRE POPULATION HAS BEEN DECLINING AT LEAST SINCE THE 1980S. IN THIS WORK A METHODOLOGICAL FRAMEWORK FOR THE MANAGEMENT OF EEL LOCAL STOCKS AT THE CATCHMENT SCALE AND FOR THE EVALUATION OF THE BIOMASS OF ESCAPING MATURE EELS WAS SET UP. THE REFERENCE SYSTEM IS THE BOLSENA LAKE WITH ITS EMISSARY
THE RIVER MARTA
THAT IS A NATURAL GROWING HABITAT FOR EEL
BUT FRAGMENTIZED BY SEVERAL DAMS AND AN IMPORTANT FISHERY SITE. TWO SAMPLING CAMPAIGNS HAVE BEEN CARRIED OUT
ONE TO ASSESS EFFECTIVENESS OF RESTORATION INTERVENTIONS FOR EEL COLONIZATION AND ESCAPEMENT IN THE RIVER MARTA AND THE SECOND TO CHARACTERIZE THE DEMOGRAPHIC AND GROWTH FEATURES OF THE LOCAL POPULATION IN THE BOLSENA LAKE. ACCORDINGLY
A DETAILED DEMOGRAPHIC MODEL WAS DEVELOPED TO ALLOW US TO REALISTICALLY SIMULATE THE FISHERY YIELDS AND SILVER EEL PRODUCTION UNDER DIFFERENT RECRUITMENT AND MANAGEMENT SCENARIOS (SCENARIO A
B
C???). THE SIMULATIONS YIELDED BY THE MODEL GIVE INTERESTING RESULTS CONCERNING POTENTIAL ESCAPEMENT FROM THE LAKE (ESTIMATED IN 36
7 T OF SILVER EEL BIOMASS). IN CONTRAST THE ACTUAL LEVEL IS ESTIMATED IN 23
7 T
MORE THAN 60 % OF THE PRISTINE LEVEL. THEREFORE
THE TARGET OF 40 % OF THE PRISTINE ESCAPEMENT FROM INDICATED BY THE CE REGULATION 1100/2007 WOULD BE ATTAINED
IF THE EFFECTIVE ESCAPEMENT FROM THE LAKE AND THE DOWNSTREAM MIGRATION WERE ENSURED
MORE THAN 60 % OF THE PRISTINE LEVEL. THEREFORE
THE TARGET OF 40 % OF THE PRISTINE ESCAPEMENT FROM INDICATED BY THE CE REGULATION 1100/2007 WOULD BE ATTAINED
Settore BIO/07
7 T OF SILVER EEL BIOMASS). IN CONTRAST THE ACTUAL LEVEL IS ESTIMATED IN 23
7 T
C???). THE SIMULATIONS YIELDED BY THE MODEL GIVE INTERESTING RESULTS CONCERNING POTENTIAL ESCAPEMENT FROM THE LAKE (ESTIMATED IN 36
A DETAILED DEMOGRAPHIC MODEL WAS DEVELOPED TO ALLOW US TO REALISTICALLY SIMULATE THE FISHERY YIELDS AND SILVER EEL PRODUCTION UNDER DIFFERENT RECRUITMENT AND MANAGEMENT SCENARIOS (SCENARIO A
THE EUROPEAN EEL (ANGUILLA ANGUILLA
BUT FRAGMENTIZED BY SEVERAL DAMS AND AN IMPORTANT FISHERY SITE. TWO SAMPLING CAMPAIGNS HAVE BEEN CARRIED OUT
L. 1758) IS A PANMICITIC SPECIES
THAT IS A NATURAL GROWING HABITAT FOR EEL
ONE TO ASSESS EFFECTIVENESS OF RESTORATION INTERVENTIONS FOR EEL COLONIZATION AND ESCAPEMENT IN THE RIVER MARTA AND THE SECOND TO CHARACTERIZE THE DEMOGRAPHIC AND GROWTH FEATURES OF THE LOCAL POPULATION IN THE BOLSENA LAKE. ACCORDINGLY
FOR WHICH A URGENT CONSERVATION ISSUE EXISTS SINCE ITS ENTIRE POPULATION HAS BEEN DECLINING AT LEAST SINCE THE 1980S. IN THIS WORK A METHODOLOGICAL FRAMEWORK FOR THE MANAGEMENT OF EEL LOCAL STOCKS AT THE CATCHMENT SCALE AND FOR THE EVALUATION OF THE BIOMASS OF ESCAPING MATURE EELS WAS SET UP. THE REFERENCE SYSTEM IS THE BOLSENA LAKE WITH ITS EMISSARY
THE RIVER MARTA
WITH IMPORTANT SCIENTIFIC AND ECONOMIC VALUES
IF THE EFFECTIVE ESCAPEMENT FROM THE LAKE AND THE DOWNSTREAM MIGRATION WERE ENSURED
Databáze: OpenAIRE
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