A new type of zooplankton sampler

This paper describes a new, simple zooplankton sampler for quantitativesampling and studying the microdistribution of the mesozooplankton.     

Plankton and hydrography in a moderately eastern Adratic bay (Gruž Bay)

Gruž Bay (south-eastern Adriatic) is moderately eutrophicated, mostly by discharge from the karst river Ombla. Input of inorganic nitrogen might be attributed to enrichment from the open sea during strong and continuous north winds in winter 1988/89. Annual succession of primary producers, herbivores and decomposers was defined by seven stages and induced by specific physical-chemical characteristics. In the period April–August, biological production was mostly due to small size fractions of phytoplankton and zooplankton. Recycling of planktonic biomass occurred in September, of allochtonous organic matter in February and March.     

On the occurrence of Calycophorae (Siphonophora) in the southern Adriatic and Tyrrhenian Sea: a comparison of the annual cycles off Dubrovnik and Naples

The 1965/66 samples taken monthly at three stations in the Bayof Naples and in the south of Dubrovnik were used to comparethe calycophore fauna of the Tyrrhenian Sea and the Adriatic.Nearly identical calycophore fauna were found, except for threerare Atlantic forms registered only by the deep-sea stationin the Tyrrhenian Sea. Of numerical importance were the neriticspecies Muggiaea kochi, Lensia subtilis, Sphaeronectes gracilisand S. irregularis, and the characteristic open-sea speciesEudoxoida spiralis and the deep-sea species Lensia melton. Theannual numerical abundance maxima in both areas were noted inspring. However, in the Tyrrhenian Sea, the values were twotimes higher, which agrees with the productivity patterns. ¹Prof. Dr Tomo Gamulin died in Dubrovnik on June 4, 1991