engleski

Umbraulva dangeardii – rijetko zabilježena vrsta u Jadranskom moru

Until recently, Umbraulva dangeardii M. J. Wynne & G. Furnari 2014, (synonyms: Umbraulva olivascens, Ulva olivascens) was classified as a member of the genus Ulva. It was separated in a special genus Umbraulva due to the molecular findings and the presence of the photosynthetic pigment siphonaxanthin. Species has been recorded over a wide area of the Mediterranean Sea, in the European part of the Atlantic Ocean, Canary Islands and in New Zealand. In the Adriatic Sea it was found only in the Gulf of Trieste and at the Kornati Islands. From 2014 to 2016 species was frequently found on our field trips in Split and Kaštela Bay during spring, as one of the most abundant alga of the shallowest infralittoral polluted areas. Although this alga is similar to species of the genus Ulva (“Ulva” morphotype), it can be morphologically distinguished from them by specific olive green color, thin and tender texture, and numerous elliptical perforations on the thallus. The main anatomical characteristics of specimens from Split and the Kaštela Bay correspond to the taxa described from the Atlantic and the Mediterranean: the thickness of the two-layer thallus varies from 50 to 115 μm ; the surface cells are polygonal to round from 11 to 51 μm long ; there is a single chloroplast with one to two pyrenoids. Differentiating the species within the genus Ulva is very difficult due to their morphological similarities between the species as well as the high levels of morphological variation within the species. Umbraulva dangeardii has notable differences but also many morphological similarities with the representatives of the genus Ulva. For that reasons we could conclude that the species is widespread along the Adriatic eutrophicated coastal areas, but has remained rarely observed inside the Ulva association due to its cryptic features. This presumption will need to be further investigated and confirmed in our future research.

macroalgae, genus Umbraulva, Adriatic Sea

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