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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Rainfall Influence on the Abundance of Bacteria in Dubrovnik Marine Waters
Author(s)
Antonia Merčep1, Andrej Jozinović1 , Lucia Stipičević1 , Dolores Grilec2 and Marijana Pećarević1
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DOI:10.17265/2328-7136/2018.05.004
Affiliation(s)
1. Department of Aquaculture, University of Dubrovnik, Ćira Carića 4, Dubrovnik, Croatia
2. Institute of Public Health Dubrovnik-Neretva County, Dr. Ante Šercera 4a, Dubrovnik, Croatia
ABSTRACT
Microbiological testing of the
sea gives us great knowledge about its quality for swimming. Here we are
following the fluctuations in the abundance of E. coli colonies, intestinal
enterococci and total coliforms on three beaches in Dubrovnik during the rainfall
in winter and spring. Three beaches Porporela, Banje and Excelsior are the most
visited beaches during the summer season. Samples were taken before, during and
after the rainfall on the surface, in the depth of 0.5 m and 1 m. Membrane filtration was used for sample
treatment. Expected increase in the abundance of colonies is shown most on the
Banje beach where the total coliforms increased 15.80 times while on the Excelsior beach E. coli colonies increased 12 times during the rainfall. On
the Porporela beach there was a mild increase of intestinal enterococci
colonies for 6.66 times. Regarding the
data of the Institute of Public Health Dubrovnik-Neretva County the beaches
were mostly marked as “excellent” especially since 2003 when the sewers were
regulated in the Dubrovnik Old Town. The number of all colonies after the
rainfall reduced for 99.80% in
all three locations.
KEYWORDS
Bacteria, sea for swimming, rainfall.
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