engleski

Review of Laminaria rodriguezii records in the Adriatic Sea

Laminaria rodriguezii Bornet is an endemic deep water Mediterranean alga. In the Adriatic Sea it is observed only in Croatian waters. First detailed knowledge of its distribution was obtained in 1948-1949 during the expedition Hvar. Using trawl net, the alga was collected on 15 transects in Jabuka Pit and Palagruža Islad area where it was found solely or with Sargassum vulgare C. Ag., Halarachnion spathulatum (J. Ag.) Kütz. f. luxurians Ercegović and Cystoseira discors C. Ag. ssp. latiramosa Ercegović. In expeditions between 1956 and 1961 the alga was collected on new locations near Jabuka Pit using trawl nets and most of the previous records were confirmed. During all these missions, the alga were collected on transects which were between 120 and 260 meters deep. Since 1996 annual fishery expeditions using trawl nets have been established and cover also Jabuka Pit and Palagruža Island area. These expeditions recorded L. rodriguezii as a bycatch on just three transects near Palagruža Island. In 1998 one thalii was collected near Palagruža Island by grab on 118 m depth. With the aim to asses the status of the L. rodriguezii, we explored ten transects in Jabuka Pit and Palagruža area using ROV in spring 2010 (Project "Brown algal biodiversity and ecology in the Eastern Mediterranean Sea" – TOTAL Foundation). Two thalii of L. rodriguezii were found only close to Island of Palagruža on 98 m depth in the area protected from trawling. In the area of Palagruža Island L. rodriguezii became exceptionally rare and even completely disappeared in Jabuka Pit most probably due to intensive trawling. Although the fishing pressure in the area of Palagruža Island is lower than in Jabuka Pit, the recent records of the alga were critically sporadic. A management plan should be developed to enable the maintenance of L. rodriguezii in Adriatic Sea.

Laminaria rodriguezii; Adriatic Sea

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