Hrvatske vode
 
Rogozničko jezero jedinstveni anoksični sustav na jadranskoj obali
Lake Rogoznica as a unique anoxic system on the Adriatic coast

Irena Ciglenečki1, Elvira Bura-Nakić1, Marija Marguš1

Sažetak/Abstract: 

Rogozničko jezero (Zmajevo oko) je malo, prirodno eutroficirano morsko jezero smješteno na poluotoku Gradina u blizini mjesta Rogoznica. Jezero predstavlja ekstremni, krški okoliš s tipičnim karakteristikama meromiktičkih i euksiničnih sredina. Glavna karakteristika Rogozničkog jezera je postojanje izražene sezonske stratifikacije vodenih slojeva te pojava euksiničnih uvjeta u vodenom stupcu na dubini većoj od 9 m. Miješanje vodenih slojeva ovisi o meteorološkim uvjetima te može biti polagano ili naglo. Pri naglom izmješavanju oksidacija milimolarne koncentracije sulfida može dovesti do nagle potrošnje kisika, taloženja koloidnog sumpora u površinskom sloju i pojave anoksije u cijelom vodenom stupcu jezera.

Od 1994. do danas sustavno se provode prirodnoznanstvena istraživanja Rogozničkog jezera koja pokazuju kako je jezero jedinstveni anoksični okoliš ne samo na obali Jadrana, već i cijelog Mediterana. Jezero je prirodni bioreaktor s procesima čija je ravnoteža i dinamika vrlo osjetljiva na vanjske okolišne utjecaje, pa tako i globalne klimatske promjene.

 

Lake Rogoznica (Zmajevo oko) is a small, naturally eutrophicated marine lake. It is located on the Gradina peninsula near Rogoznica. The lake represents extreme karst with typical characteristics of meromictic and euxinic environments. The main characteristic of Lake Rogoznica is the existence of a marked seasonal stratification of water layers and the occurrence of euxinic conditions in the water gauge at the depths larger than 9 m. The mixing of water layers depends on meteorological conditions and can be gradual or sudden. At sudden mixing, the oxidation of millimolar sulfide concentration may lead to sudden oxygen consumption, sedimentation of colloidal sulphur in the surface layer and occurrence of anoxia in the whole water gauge of the lake.

From 1994 to the present day, science investigations of Lake Rogoznica have been systematically carried out, showing that the lake is not only a unique anoxic environment on the Adriatic coast, but also in the entire Mediterranean. The lake is a natural bioreactor, with processes whose balance and dynamics are very sensitive to external environmental influences, including the global climate change as well.

Kategorija: 
Izvorni (originalni) znanstveni članak / Original Scientific Paper
Ključne riječi/Key words: 

Rogozničko jezero, ektremni sulfidni okoliš, anoksija, euksinija, koloidni sumpor, izmješavanje

Lake Rogoznica, extreme sulfide environment, anoxia, euxinia, colloidal sulphur, mixing

Podaci o autorima/Authors affiliations: 

1Institut „Ruđer Bošković“, Zavod za istraživanje mora i okoliša, Bijenička 54, 10000 Zagreb,  capka@cirus.dhz.hr

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