EVALUATION OF PHYSIC-CHEMICAL AND BIOLOGICAL CONDITIONS FROM THE PSAMMIC HABITATS THAT ARE POPULATED BY INTERSTITIAL CNIDARIAN SPECIES (CNIDARIA-HYDROZOA) FROM VAMA VECHE, ROMANIAN BLACK SEA COAST

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-14-8 / ISSN 1314-2704, June 19-25, 2014, Book 3, Vol. 2, 601-606 pp

ABSTRACT
Nearly 15 years ago, we signaled for the first time the presence of a representative of the interstitial meiofauna, a Cnidaria of the genus Halammohydra (Hydrozoa- Coelenterata) in the Black Sea, in the Vama Veche mediolittoral sedimentary habitats. We specify that our subsequent studies realized over the entire Romanian littoral (in the shallow waters and deep zones) allowed us to signal these Cnidaria only in these habitats with coarse sediments located in the shore line in the southern extremity of the Romanian littoral. He purpose of our study was to evaluate the way in which the population of the cnidarian develops within the interstitial invertebrate community of the midiolittoral level at Vama Veche and evaluation of physic-chemical and biological conditions from sedimentary habitats. The mediolittoral meiofauna community in the interstitial space of the sediments includes, apart from typical representatives of this category (Cnidaria-Hydrozoa, Turbellaria, Nematoda, Polychaeta, Oligochaeta, Acarina, Ostracoda, Harpacticoida), also juvenile representatives of the macrofauna in the neighboring habitats (whose size is under 1 mm: Polychaeta, Oligochaeta, Amphipoda, Tanaidacea, Cumacea, Isopoda, Insecta). Even though the Cnidaria population does not have high values of the average density (according to abundance: 49 indv.m-2), by its position from the trophic point of view (exclusively predatory regime), it has however an important role in the fauna community of the psamic habitats.

Keywords: mediolittoral, meiofauna, psammon, interstitial invertebtates, cnidaria