Bacterial Communities in Shallow Aquatic Habitats of Poste-de-la-Baleine (Kuujjuarapik) Region, Quebec, Canada
Antoine Aubin, Jacques Boisvert, Guy Charpentier
Bacterial communities from two types of shallow pools were studied in Poste-de-la-Baleine region (Kuujjuarapik) (55°16′N, 77°48′W), in the hemiarctic area of Quebec, Canada. The first pool was situated on rock exposures (rock pool) and the second was on sandy-clay deposits within an alder and willow vegetation unit. Bacterial counts were made with epifluorescence microscopy and acridine orange staining. The bacterial communities of both habitats are composed mainly of bacilli and cocci and their relative composition remains stable despite variations of bacteria cell numbers. The highest counts were observed in the rock pool, with a peak in July of 4.32 × 106 cells ml−1. In the alder-willow unit, the July peak was 2.94 × 106 cells ml−1. Water temperature and total bacteria cell numbers (log) were closely correlated (r = 0.6811; p<0.001); from the slope of the regression line (0.0549), it can be estimated that the expected variations of total bacteria cell numbers, following a 10°C rise in temperature, would be by a factor of 3.54.
Citation Note: This article was published when our journal had an earlier shorter name: "Arctic and Alpine Research."