A study was carried out on the composition and structure of the community of the benthic, epilithic and epiphytic diatoms of Lake Trasimeno, representative of the Mediterranean eco-region with the aim of 1) to assess the biological diversity of this environment in relation to the community biotic examined; 2) to assess the trophic status of lake through the application of the EPI-L index, based on the lake benthic diatoms; 3) to contribute to the implementation of lake ecosystem assessment methods at the national level, in the context of collaboration between the ARPA/APPA, the CNR and the Ministry of the Environment, Land and Sea Protection (MATTM). Diatoms were sampled from 5 representative stations of lake. The total number of taxa identified was 85 species belonging to 26 genera. The number of species in each station ranges from a minimum of 32 to a maximum of 46. The station with the greatest number of species is located in the protected area of the Oasis La Valle. The most abundant and frequent species is Encyonema caespitosum, followed by Epithemia sorex, Staurosira grigorzskyi, Pseudostaurosira brevistriata and Mastogloia smithii. The presence of the exotic species Reimeria uniseriata has also been confirmed. The application of the EPI-L Index classified the lake in the “Sufficient” Ecological Quality Class (although only in one station the percentage of species used was greater than 70%, as required by the method). This trophic classification agrees with the institutional ecological classification of ARPA UMBRIA, based on a judgment associated with both the phytoplankton community and the basic chemical-physical elements. This study contributed to the specific knowledge of the diatomic benthic lake communities of Trasimeno and to implementation of the assessment methodology of lake ecosystems at national level, especially regarding the reference list used for the calculation of the EPI-L index, still being updated

Diversità delle diatomee bentoniche del lago Trasimeno e valutazione dello stato trofico lacustre

Elia AC
Writing – Review & Editing
2020

Abstract

A study was carried out on the composition and structure of the community of the benthic, epilithic and epiphytic diatoms of Lake Trasimeno, representative of the Mediterranean eco-region with the aim of 1) to assess the biological diversity of this environment in relation to the community biotic examined; 2) to assess the trophic status of lake through the application of the EPI-L index, based on the lake benthic diatoms; 3) to contribute to the implementation of lake ecosystem assessment methods at the national level, in the context of collaboration between the ARPA/APPA, the CNR and the Ministry of the Environment, Land and Sea Protection (MATTM). Diatoms were sampled from 5 representative stations of lake. The total number of taxa identified was 85 species belonging to 26 genera. The number of species in each station ranges from a minimum of 32 to a maximum of 46. The station with the greatest number of species is located in the protected area of the Oasis La Valle. The most abundant and frequent species is Encyonema caespitosum, followed by Epithemia sorex, Staurosira grigorzskyi, Pseudostaurosira brevistriata and Mastogloia smithii. The presence of the exotic species Reimeria uniseriata has also been confirmed. The application of the EPI-L Index classified the lake in the “Sufficient” Ecological Quality Class (although only in one station the percentage of species used was greater than 70%, as required by the method). This trophic classification agrees with the institutional ecological classification of ARPA UMBRIA, based on a judgment associated with both the phytoplankton community and the basic chemical-physical elements. This study contributed to the specific knowledge of the diatomic benthic lake communities of Trasimeno and to implementation of the assessment methodology of lake ecosystems at national level, especially regarding the reference list used for the calculation of the EPI-L index, still being updated
2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1491661
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