engleski

Holocene Ostracoda (Crustacea) from the Baćina lakes (Dalmatia, Croatia)

The Baćina Lakes are located in Dalmatia close to the Adriatic Sea coast near the town of Ploče. They are composed of seven karstic lakes: Crniševo, Očuša, Podgora, Vrbnik, Sladinac, Vitanj and Plitko, with a total area of 1.4 km2. The lakes fill a string of cryptodepressions of irregular form, and represent an interesting phenomenon in the karst. Within their zone there are several springs, tunnel which drives water from the upper zones (constructed in 1938) and the tunnel which drains water from the lakes into the sea (constructed in 1913). Generally according to biological productivity, the Baćina Lakes are classified as mesotrophic type of lakes, and according to their thermal classification they are polymictic. Only the deepest Lake Crniševo is influenced by brackish waters from the Mindel spring as well as sea water which enter the lake through a sinkhole at the bottom, especially during dry periods of the year (Ilijanić et al., 2015 ; Miko et al., 2015). The present investigation is a part of the Lost Lake Landscapes of the Eastern Adriatic Shelf (LoLADRIA) project. The LoLADRIA project represents a multidisciplinary, effort to recover, for the first time, long paleoenvironmental, and paleoclimate records from existing coastal karst lakes and submerged karstic lakes of the eastern Adriatic shelf in Croatia. Preliminary results of multi- disciplinary investigation of sediment cores recovered from the lakes provides information about the Late Glacial and Holocene history of the lakes and related changes in the catchment area. In our work we will present ostracod assemblages from a core Baj- 1 of lake Podgora ; a core Baj 5 of lake Sladinac ; and core Baj-7 of lake Crniševo. Identified fossil ostracods in most of them coincide in all three cores. We identified a diverse ostracod fauna within three cores including 12 species that are referable to four families: Darwinula stevensoni within Darwinulidae ; Candona paionica, Candona cf. ovalis, Candona meidionalis, Candona cf. expansa, Candona ex. g. neglecta, Candona cf. goricensis, Candona sp., Pseudocandona compressa, Cypria ophtalmica within Candonidae ; Ilyocypris bradyi within Ilyocyprididae ; and Potamocypris sp. within Cyprididae. Most of ostracod species belongs to family Candonidae. Identified Candonids from Baćina Lakes relate best to the known Candonids from Lakes Ohrid, Prespa and Shkodra, all from the Balkan Peninsula. Identified ostracod species provide insight into the changes in the hydrology of Baćina Lakes and can be utilized in the Holocene non-marine deposits as a tool to help establishing paleoenvironments.

Non -marine ostracods, Baćina Lakes, Holocene

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