Distribution of general aerobic heterotrophic bacteria in sediment core taken from the Canadian basin and the Chukchi Sea

• Main Authors: Aiguo, Gao, Haowen, Chen
• Format: Article in Journal/Newspaper
• Language: English
• Published: Polar Research Institute of China - PRIC 2008
• Subjects: Oceans; Chukchi Sea; Advances in Polar Science; Chukchi; Polar Science
• Online Access: http://library.arcticportal.org/2344/; http://library.arcticportal.org/2344/1/A200801003.pdf

The occurrence percentage and abundance of General Aerobic Heterotrophic Bacteria (GAB) were determined by using the method of MPN for 182 sub-samples from 10 sediment cores taken from the Canadian basin and the Chukchi Sea at two different culturing temperatures. The results showed that the general occurrence percentage of GAB was quite high, average abundances of GAB at cultured temperatures of 4°C and 25°C were 4.46 x 10(7) and 5.47 x 10(7) cells * g(-1) (wt), respectively. The highest abundance of GAB occurred at 20 ~ 22 cm section in the sediment. GAB abundances changed among the section of sediments, but there is a trend: the abundances at the middle or lower sections were lower than those at upper section. Cultivation at 25°C could improve the occurrence percentage and abundances of GAB, which suggests that the increasing of temperature may change the living circumstances of GAB. The differences of GAB among the latitudes areas indicated that occurrence percentage and abundances of GAB in middle latitude areas were higher than those in the higher or lower latitude areas, and were more obvious at 4°C than those at 25°C. The GAB abundances in sediment under the shallower water seemed to be lower than those in sediments under the deeper water and this status was more obvious at 25°C than that of 4°C.