Read/Search this Article
We examined diatom flora of Kasumi Rock and Shinnan Rocks around Syowa Station, and found that Kasumi Rock had 31 species of diatoms including 14 endemic species, and Shinnan Rocks had 32 species of diatoms including 6 endemic species. Comparing with total number of species, the number of endemic ones was rather small. On the other hand, at Cape Royds near McMurdo Station, the total number of species was 21,including 13 endmic species. At Cape Evans, the total number of species was 15,including 9 endemic species. At Cape Barne, the total number was 11,including 9 endemic species, and near McMurdo Station the total number was 16,including 10 endemic species. Although the total number of species around McMurdo Station is small, the rate of endemic species is much higher. Dominant species near Syowa Station were Hantzschia amphioxys, Navicula cryptocephala, Nitzschia palea and Tropidoneis leavissima, and cosmopolitan species were more but endemic species were less. Around McMurdo Station, dominant species were Tropidoneis laevissima, Pinnularia cymatopleura, Navicula muticopsis and Navicula peraustralis, but these were all endemic species and there were no cosmopolitan species. These facts indicate that around Syowa Station, cosmopolitan species were more numerous than endemic species and there was not so Antarctic vegetation, but that around McMurdo Station located in latitude 80°S, which is 10°higher than Syowa Station almost all species were endemic species and few cosmopolitan species were found and there was almost completely Antarctic vegetation. We found that the difference of only 10°in latitude causes such remarkable variation of diatom flora.