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HABITATS DISTURBANCES IN DANUBE DELTA BIOSPHERE RESERVE

Mihai DOROFTEI, Marian MIERLA, Jenica HANGANU

Introduction

EnviroGRIDS FP 7 Project is dealing with observations of the changes to look at BSRB it was in pristine time and how it evolved. Special focuses is on amount of water discharge and quality of water, in the context of climate changes and human intervention, its impact to biodiversity in the region especialy on how costal and wetland ecosystems is responding to such changes and make us aware of risks that are born as flood, lost of biodiversity, ecosystems impact, invasive plants but in support of initiative in taken actions. The work is presenting observation of potential impact of climatic and human induced changes on Danube Delta habitat types highlighting pressures and important conflicts and problems and producing vulnerability maps at the Danube Delta Biosphere Resserve cantons level. The habitat loss indicators were derived from existing field data on plant species, insects communities, (namely grasshoppers, locust and crickets - ord. Orthoptera), and vegetation coverage. Both plant and insect group species have been monitored on the basis of quantitative and qualitative population indices. Out of DDNI biodiversity database, updated in 2010, we have colected field data on distribution, area, cover, abundace, s.o. A GPS divise was use for field orientation and masurment of area cover and distribution of the species. Invasive species impact index has been use to quantify spreading potential of susceptible invasive plants. On the basis of all these indicators, we have carried out thematic maps, on the entire territory of Danube Delta, in order to spotlight the vulnerability level of habitats depending on: regional drivers; flooding; habitat status (invasive plant species, biological indicators) and land use/cover.

Map of maximum water levels in Danube Delta Biosphere Reserve (DDBR):