Abstract:

This paper determined the abundance of General Aerobic heterotrophic Bacteria(GAB) in surface sediments from the Chukchi Sea and the Canadian Basin by using MPN and discussed their geographical distribution.The result showed that the determination percentages of the GAB were high,even till 100%.The abundance range and averages of GAB for 4℃ and 25℃ were 4.00×102—2.40×106,1.71×106 cell·g-1(wet sample) and 2.40×105—2.40×107,1.10×107 cell·g-1(wet sample) respectively.Not only the abundance range but also the averages of GAB at 25℃ were higher than that at 4℃.The abundance of GAB in sediments showed a tendency of roughly higher in the lower latitudinal area than in the higher latitude.The abundance of GAB increased from east to west in longitude.With the water depth increasing,the abundance of GAB at 4℃ decreased,but it's different at 25℃.It seemed that warmer circumstantial temperature was more suitable for some GAB.