Diatom Based Inference Of Change In Climate And Biodiversity In Erlongwan Maar Lake, Northeastern China

Changes are expected in a large range of climate variables including drought, ice volume, sea level. These changes are bringing and will bring major changes to elements of the biosphere. The diatom data from the Article showed that many arctic freshwater ecosystems have experienced dramatic and unidirectional regime shifts within the last 150 years. And the fresh lake from the middle latitude also showed the similar ecology change. Here we check if the fresh lake from the Northeast China also shows the similar change.Erlongwan (ERL, 42°18'N, 126°21'E) is one of 8 maar and crater lakes in the Long Gang Volcanic Field (LGVF) located in Jilin Province, NE China。We identified 183 diatom species in the sediments from Erlongwan. Two significant zones were recognized by optimal partitioning of the diatom data. In addition, we also distinguished subzones. Zone ERL-1 referred to as the Little Ice Age indicated long ice cover due to cold period. ERL2a was dominated by the planktonic diatom Punticulata praetermissa and Asterionella formosa, indicating long duration of ice free and strong turbulence in lake water with the global warming. In zone ERL2b, Punticulata praetermissa and Asterionella formosa were still dominant species, but Cyclotella pseudostelligera increase during this period, indicating weaker turbulence in water than before. The biodiversity show a increase trend with global warming.