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Epilithic diatom assemblages and environmental quality of the Su Gologone karst spring (central-eastern Sardinia, Italy)

Lai, Giuseppina Grazia and Padedda, Bachisio Mario and Wetzel, Carlos Eduardo and Lugliè, Antonella Gesuina Laura and Sechi, Nicola and Ector, Luc (2016) Epilithic diatom assemblages and environmental quality of the Su Gologone karst spring (central-eastern Sardinia, Italy). Acta Botanica Croatica, Vol. 75 (1), p. 129-143. ISSN 0365-0588. eISSN 1847-8476. Article.

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DOI: 10.1515/botcro-2016-0008

Abstract

Karst springs are considered among the most vulnerable groundwater-dependent ecosystems. Despite their ecological value and importance as strategic water sources, Mediterranean karst springs are still poorly investigated. The aim of this study was to analyse the epilithic diatom assemblages and to test their usefulness as indicators of environmental quality on the Su Gologone spring (central-eastern Sardinia, Italy), a biotope of great natural value and a precious source of drinking water. A total of 89 diatom taxa were found with 25 new records for Sardinian running waters. Species richness, Shannon-Wiener and Pielou indices showed good biotic integrity. The dominant taxa were alkaliphilous, halophobous-oligohalobous exigent, xeno- oligosaprobic and characteristic of oligotrophic waters. The eutrophication/pollution index − diatom based (EPI-D) and the Navicula Nitzschia Surirella indices indicated respectively an excellent/good biological water quality and a low physical disturbance. However, the biological and chemical oxygen demand, and the microbiological variables (E. coli, fecal and total coliforms) revealed an organic contamination of the water, although moderate. The judgment provided by the EPI-D should be verified after updating of the index. In fact, 10 taxa found in this study are not currently considered by the EPI-D method.

Item Type:Article
ID Code:11274
Status:Published
Refereed:Yes
Uncontrolled Keywords:Bacillariophyta, biological quality, diatom indices, groundwater-dependent ecosystems, karst springs, Mediterranean region, physical disturbance, Sardinia
Subjects:Area 05 - Scienze biologiche > BIO/07 Ecologia
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:De Gruyter OPEN
ISSN:0365-0588
eISSN:1847-8476
Copyright Holders:© by Giuseppina G. Lai
Deposited On:26 Apr 2016 11:03

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