lake beleu is a paradise for birds especially for the many endangered species here, among them the great egret. but not all the fauna around the lake is native to it, says aurel lozan, an expert on biodiversity. some are invasive species, and they pose a threat to the vegetation. >> this seems to be a migratory locust; this is a pest. and the fact that we found it here means, that it penetrates from souther regions to here, which means, it's a result of changes in environment, probably climate change, climate warming. >> added to the global environmental problems are moldova's regional ones: agriculture is encroaching on the lake. >> in fact, lake started to degrade very rapidly, especially during the last decade. and this is because of the sediment, which comes from the agricultural field through an artifical built channel. the production methods of industrial farming are having a major impact on moldova's environment and biodiversity. about three quarters of moldova's land is under cultivation, and pesticides and artificial fertilizers are widely used. monocultures of corn and sunflowe