Biološka i hidrografska istraživanja frontalnog sustava u sjevernom Jadranu; ljetni aspekt

master's thesis

• Title (english): BIOLOGICAL AND HYDROGRAPHICAL RESEARCH OF THE NORTHERN ADRIATIC FRONTAL SYSTEM; SUMMER ASPECT
• Author: Gala Podgornik
• Mentor: Damir Viličić (mentor)
• Committee member: Damir Viličić (predsjednik povjerenstva)
• Committee member: Jasna Lajtner (član povjerenstva)
• Committee member: Ana Galov (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2011-02-17, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Provedena su istraživanja duž profila uz sjeveroistočnu obalu Jadrana, u kolovozu 2008. i 2009. godine, u tri različita tipa vode: 1) Sjevernojadranskoj vodi (NAW), 2) vodi iz Kvarnera, te 3) Istočnojadranskoj struji (EAC). Mjerenja površinske temperature i klorofila α uz pomoć satelita (NOAA 15 AVHRR s radiometrom visoke rezolucije i senzorom za detekciju klorofila), dokazuju prisustvo frontalnog sustava (fronte) jugozapadno od vrha Istre koji razdvaja sjevernu vodu (NAW) bogatiju klorofilom od vode siromašnije klorofilom koja dotiče s juga (EAC). Prijelazom preko fronte od zapada prema istoku je utvrđeno opadanje koncentracije ortofosfata (PO43-) i porast koncentracije ortosilikata (SiO44-), dok je fronta najbogatija ukupnim anorganskim dušikom (TIN) i amonijevim ionom (NH4+). NAW je bogatija fitoplanktonom, osobito dijatomejama Pseudo-nitzschia spp. i Dactyliosolen fragilissimus. EAC je obilježena gušćom populacijom kokolitoforida Syracosphaera pulchra. Smanjena koncentracija kisika i povećana koncentracija dušika u fronti vjerojatno je odraz ubrzane mikrobne regeneracije organske tvari. Povećana abundancija fitoplanktona u fronti može biti rezultat bogatijeg sastava hranjivih tvari ili fizičkog nakupljanja u zoni konvergencije. Istraživanje pokazuje kako suvremena satelitska tehnika i klasična terenska istraživanja mogu poslužiti boljem razumijevanju hidrografskih svojstava i bioloških procesa u moru.

Abstract (english)

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.

• Keywords: frontalni sustav; hidrografija; fitoplankton; Jadransko more
• Keywords (english): frontal system; hydrography; phytoplankton; Adriatic Sea
• Language: croatian
• URN:NBN: urn:nbn:hr:217:459379
• Study programme: Title: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-05-03 09:44:48