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DatoValore
TitleMicrobial pollution indicators and culturable heterotrophic bacteria in a Mediterranean area (Southern Adriatic Sea Italian coasts)
AbstractIn the present study we evaluated the degree of microbial water pollution along the coast line between Brindisi and Santa Maria di Leuca (Southern Adriatic Sea) as well as the culturable heterotrophic bacteria abundances and biodiversity in relation to the microbiological quality of the water. A total of 3773 colonies were isolated, subcultured and identified by several morphological, cultural and biochemical methods including the standardized API 20 E and API 20 NE tests. Along the examined coastal tract the microbial pollution indicators were always below the tolerance limits for bathing waters defined by the CEE directive, suggesting a good sanitary quality. Concerning culturable heterotrophic bacteria, different temporal density trends were observed in the four sites in relation to their geographical position. A positive relationship between the bacterial abundances and the temperature was observed in S. Cataldo and Otranto. The culturable bacterial community was mainly composed of the genera Aeromonas, Pseudomonas, Photobacterium and Flavobacterium. The Enterobacteriaceae family represented a conspicuous component of the bacterial community too. Bacilli were predominant among the Gram-positive bacteria. Of interest is the isolation of yeasts (2% at the surface and 1% at the bottom) taking into account their capability of biodegradation of various materials. Because of the low level of microbial pollution recorded, our results are indicative of the natural variation and diversity of the culturable bacterial community in such an oligotrophic ecosystem and could represent a good point of comparison with other ecosystems as well as a baseline for long term studies aimed to evaluate the effects of environmental fluctuations and human impacts on this aspect of biodiversity in coastal areas.
SourceJournal of sea research (Den Burg. Print) 65 (4), pp. 461–469
KeywordsFaecal contamination indicatorsWater qualityCulturable heterotrophic bacteriaSouthern Adriatic Sea
JournalJournal of sea research (Den Burg. Print)
EditorElsevier Science, Den Burg, Paesi Bassi
Year2011
TypeArticolo in rivista
DOI10.1016/j.seares.2011.04.010
AuthorsSTABILI L.,CAVALLO R.A
Text215312 2011 10.1016/j.seares.2011.04.010 ISI Web of Science WOS WOS 000291911500009 Faecal contamination indicators Water quality Culturable heterotrophic bacteria Southern Adriatic Sea Microbial pollution indicators and culturable heterotrophic bacteria in a Mediterranean area Southern Adriatic Sea Italian coasts STABILI L.,CAVALLO R.A IAMC CNR U.O.S. di Taranto In the present study we evaluated the degree of microbial water pollution along the coast line between Brindisi and Santa Maria di Leuca Southern Adriatic Sea as well as the culturable heterotrophic bacteria abundances and biodiversity in relation to the microbiological quality of the water. A total of 3773 colonies were isolated, subcultured and identified by several morphological, cultural and biochemical methods including the standardized API 20 E and API 20 NE tests. Along the examined coastal tract the microbial pollution indicators were always below the tolerance limits for bathing waters defined by the CEE directive, suggesting a good sanitary quality. Concerning culturable heterotrophic bacteria, different temporal density trends were observed in the four sites in relation to their geographical position. A positive relationship between the bacterial abundances and the temperature was observed in S. Cataldo and Otranto. The culturable bacterial community was mainly composed of the genera Aeromonas, Pseudomonas, Photobacterium and Flavobacterium. The Enterobacteriaceae family represented a conspicuous component of the bacterial community too. Bacilli were predominant among the Gram positive bacteria. Of interest is the isolation of yeasts 2% at the surface and 1% at the bottom taking into account their capability of biodegradation of various materials. Because of the low level of microbial pollution recorded, our results are indicative of the natural variation and diversity of the culturable bacterial community in such an oligotrophic ecosystem and could represent a good point of comparison with other ecosystems as well as a baseline for long term studies aimed to evaluate the effects of environmental fluctuations and human impacts on this aspect of biodiversity in coastal areas. 65 Published version Articolo in rivista Elsevier Science 1385 1101 Journal of sea research Den Burg. Print Journal of sea research Den Burg. Print J. sea res. Den Burg. Print Journal of sea research. Den Burg. Print JSR Den Burg. Print loredana.stabili STABILI LOREDANA rosaanna.cavallo CAVALLO ROSA ANNA TA.P04.002.001 Fascia Costiera e Ambienti di Transizione analisi strutturale e funzionale delle componenti biotiche ed abiotiche degli ecosistemi per lo sviluppo sostenibile delle attivita TA.P04.029.002 Utilizzazione di biomasse e sostanze attive da organismi marini biotecnologie per loo sviluppo di nuovi bio materiali e composti bioattivi