Abundance and spatial dynamics of bacterioplankton in the Seven Rila Lakes, Bulgaria

作者：Boteva Silvena; Traykov Ivan^*; Kenarova Anelia; Bogoev Valentin

来源：Chinese Journal of Oceanology and Limnology, 2010, 28(3): 451-458.

DOI：10.1007/s00343-010-9027-0

• bacterial abundance
• high mountain lake
• Rila Mountain
• environmental factor
• bottom-up control

In the high mountain oligotrophic Seven Rila Lakes (2 095-2 535 m a.s.l.) bacterial abundance was recorded in July and September 2006. In July, bacterial abundance (average (3.32 +/-.2.5) x 10(5) cell/ml) in the lakes correlated negatively with elevation, while in September (average (26.39 +/-.7.1). 10(5) cell/ml) this pattern was altered and the greatest abundance of bacteria occurred at the highest ((39.05 +/-.1.5). 10(5) cell/ml) and the lowest ((30.63 +/-.6.0). 10(5) cell/ml) elevated lakes. Regression analyses suggested that the principal factor controlling bacterial abundance, in both July and September, was inorganic nitrogen (NO3-N and NH4-N; R-2=0.70, P<0.05). Other major regulating factors were temperature (R-2=0.66, P<0.03) in July and filter-feeding zooplankton (R-2=0.95, P<0.01) in September. All factors, except NO3-N, had a positive effect on bacterial abundance.

• 出版日期2010-5-10