Relationship between marine epilithic diatoms and environmental variables in oligotrophic bay, NE Mediterranean

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Published: Jul 30, 2018
DOI: https://doi.org/10.12681/mms.14151
Keywords:
Bacillariophyta shallow-water habitat environmental factors diversity eastern Adriatic Bosnia and Herzegovina
DUBRAVKA HAFNER
https://orcid.org/0000-0001-7379-4719
ANA CAR
University of Dubrovnik Institute for Marine and Coastal Research
https://orcid.org/0000-0001-6018-4305
NENAD JASPRICA
Laboratory of Plankton Ecology and Population Genetics, Institute for Marine and Coastal Research, University of Dubrovnik, Kneza Damjana Jude 12, PO Box 83, HR-20000 Dubrovnik, Croatia
TATJANA KAPETANOVIĆ
Environmental Fund of the Federation of Bosnia and Herzegovina, Hamdije Čemerlića 39A, BiH-71000 Sarajevo, Bosnia and Herzegovina
IRIS DUPČIĆ RADIĆ
Institute for Marine and Coastal Research, University of Dubrovnik, Kneza Damjana Jude 12, PO Box 83, HR-20000 Dubrovnik, Croatia
Abstract

The taxonomic composition and structure of a marine epilithic diatom community were sampled from the bottom of the two sites at monthly intervals from January to December 2011 in the small semi-enclosed oligotrophic Neum Bay in Bosnia and Herzegovina (Middle Adriatic). Altogether, 264 diatom taxa (species and infraspecific taxa) within 69 genera were identified. Among them, 149 and 203 taxa occurred in samples from the shallow (0.5 m depth) and deep (8 m depth) sites, respectively. The monthly distribution of most of the diatoms was irregular and high numbers of sporadic taxa were found. SIMPER analysis indicated that the difference between shallow and deep sites could be largely attributed to the frequently recorded diatom taxa and those with high percentage abundances. They were Halamphora coffeiformis, Caloneis excentrica, Cocconeis scutellum var. scutellum, Licmophora flabellata, Licmophora gracilis, Licmophora sp., Navicula abunda, Rhabdonema adriaticum, and Striatella unipunctata. Canonical Correspondence Analysis (CCA) showed that temperature, oxygen saturation (O2/O2′), silicate concentration (SiO4), and salinity were the most important factors influencing diatom community structure in the bay.

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ANA CAR, University of Dubrovnik Institute for Marine and Coastal Research
Institute for Marine and Coastal Research
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