Biological and hydrographical research of the northern Adriatic frontal system; summer aspect

Podgornik, Gala (2011) Biological and hydrographical research of the northern Adriatic frontal system; summer aspect. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

This research was conducted in August 2008 and 2009, along the northeastern Adriatic profile. We revealed three distinctive water types: 1) the less saline North Adriatic Water (NAW), 2) the eastern coastal sea influenced by the oligotrophic karstic waters, and 3) the higher salinity, oligotrophic, north-westerly ingoing Eastern Adriatic Current (EAC). Between the rich in chlorophyll α NAW and the oligotrophic EAC, we recorded a frontal system, southwesterly of the Istrian peninsula, confirmed by IR satellite imagery (NOAA 15 Advanced Very High Resolution Radiometer) data of temperature and chlorophyll α. Moving eastwards across the frontal system, we recorded an increase in orthosilicate (SiO44-) concentration and a decrease in orthophosphate (PO43-) concentration, while the frontal zone itself was the richest in total inorganic nitrogen (TIN) and ammonium (NH4+). NAW is characterized by a dense population of diatoms such as Pseudo-nitzschia spp. and Dactyliosolen fragilissimus. EAC, on the other hand, is characterized by a dense population of the coccolithophorid Syracosphaera pulchra. The lower oxygen and the high nitrogen concentrations in the frontal system could be due to an accelerated microbial regeneration. The high abundance of phytoplankton in the frontal system might be a result of the high nutrient concentrations or its accumulation in the converging zone. The study demonstrates how different techniques (remote sensing and in situ investigations) can be useful in understanding the hydrographic and biological set up in the sea.

Item Type: Thesis (Diploma thesis)
Keywords: frontal system, hydrography, phytoplankton, Adriatic Sea
Supervisor: Viličić, Damir
Date: 2011
Number of Pages: 43
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 08 Jul 2014 08:07
Last Modified: 08 Jul 2014 08:07
URI: http://digre.pmf.unizg.hr/id/eprint/2468

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