Abundance and spatial dynamics of bacterioplankton in the Seven Rila Lakes, Bulgaria |
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| Authors: | Silvena Boteva Ivan Traykov Anelia Kenarova Valentin Bogoev |
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| Institution: | (1) Departament de Biologia Marina i Oceanografia, Institut de Ciències del Mar-CMIMA, CSIC, Pg. Marítim de la Barceloneta 37–49, E-08003 Barcelona, Spain |
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| Abstract: | 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)×105 cell/ml) in the lakes correlated negatively with elevation, while in September (average (26.39±7.1)×105 cell/ml) this pattern was altered and the greatest abundance of bacteria occurred at the highest ((39.05±1.5)×105 cell/ml) and the lowest ((30.63±6.0)×105 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. |
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