Abstract
Ecological properties and distribution and abundance of medusae were studied over an 18-month period in the Mljet Island seawater lakes, south-east Croatia. Strong stratification during the summer differentiates these lakes from the oligotrophic South Adriatic ecosystem. The lakes are designated as a moderately eutrophicated ecosystem. Very small numbers of hydromedusae were noted, representing only the Anthomedusae and Leptomedusae. A new species of the genus Tima was found in considerable numbers of individuals. High abundance of the scyphomedusa Aurelia sp. was observed throughout the year. This species differs in terms of genetic divergence from Aurelia aurita found elsewhere in the Mediterranean and could be attributed to the boreal origin.
Highlights
The island of Mljet is an offshore south Adriatic island that extends in a NW-SE direction (Fig.1).The 8-10 km wide Mljet Canal separates it from the mainland
Tima was found in considerable numbers of individuals
High abundance of the scyphomedusa Aurelia sp. was observed throughout the year. This species differs in terms of genetic divergence from Aurelia aurita found elsewhere in the Mediterranean and could be attributed to the boreal origin
Summary
The island of Mljet is an offshore south Adriatic island that extends in a NW-SE direction (Fig.1).The 8-10 km wide Mljet Canal separates it from the mainland. The island of Mljet is an offshore south Adriatic island that extends in a NW-SE direction (Fig.). As the southernmost island in the Adriatic, Mljet is directly exposed to the incoming Ionian sea current and is influenced by it (Zore-Armanda et al, 1991; The POEM Group, 1992). Plankton community structure and density values in the south. The seawater lakes “Veliko Jezero” and “Malo. Jezero” are located on the western part of Mljet. Island and are connected to the surrounding sea from the south. They are natural phenomena of karstic depressions that were filled by seawater about 4200 years B.P. The first scientific data on the marine fauna and hydrographic conditions of the Mljet lakes were published in 1935
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