Програма на научната конференция - Министерство на ...

Целите на настоящото изследване са: 1) да се направи общ преглед навидовете нашественици фито- и зоопланктон в Черно море, в частност предбългарския бряг; 2) да се разграничат чуждите видове по категории споредпроизхода им; 3) да се представи екологичната роля на чуждите видове заразнообразието на местната биота. Два чужди вида зоопланктон заематцентрално място в черноморската екосистема - Mnemiopsis leidyi и Beroeovatа, следвани от копеподите Acartia tonsa и Oithona brevicornis. Така,изменението във видовото разнообразието на планктона е изследвано ипредставено като функция от взаимодействието на нативни към чуждивидове.PLANKTON BIODIVERSITY CHANGES IN THE BLACK SEA –A CONTRIBUTION OF NON-INDIGENOUS SPECIESK. Stefanova 1 , S. Moncheva 1 , N. Slabakova 1 , L. Kamburska 21 Institute of Oceanology-BAS, P.O. Box 152, Varna, 9000, Bulgaria;e-mail: snejanam@abv.bg; stefanova@io-bas.bg; n.slabakova@abv.bg;2 European Commission, Joint Research Centre, Institute for Environment andSustainability, via E. Fermi 2749, TP 272, Ispra 21027, Italy;e-mail: lyudmila.kamburska@jrc.ec.europa.eu;During the last two decades introduction of new species has been recognized asone of the core threats to aquatic ecosystems, exaggerated further in relation to theglobal climatic changes projections. There is mounting experimental and empiricalevidence that invasions have striking impacts on the proportions of native speciesand the ecosystem resilience and health. Low species diversity (i.e. lowcompetition) and high habitat diversity (i.e. availability of potential niches) alongwith the severe anthropogenic stress in the Black Sea are deemed to favor alien’scolonization. As many as 217 introduced species have been recorded in the BlackSea until 2006. Only in the decade 1996-2005 a total of 48 non-indigenous specieswere listed, the most numerous in the plankton community: phytoplankton (16) andzooplankton (8) (Transboundary Diagnostic Analysis, 2007). The aims of thepresent study are to review the list of non-indigenous plankton species in the BlackSea, particularly along the Bulgarian coast; ii) to re-visit their assignment toaboriginal, vanished, established, casual, doubtful and excluded categories iii) tounderline the ecological role of alien species on the native species diversity.Among alien zooplankton species two has become central to the Black Seaecosystem - Mnemiopsis leidyi and Beroe ovata, followed by copepods Acartiatonsa and Oithona brevicornis. Further, the plankton diversity shift is presented asa function of indigenous/non-indigenous interaction.133