期刊
EXTREMOPHILES
卷 18, 期 1, 页码 111-119出版社
SPRINGER JAPAN KK
DOI: 10.1007/s00792-013-0602-0
关键词
Picoeukaryotes; Alkaline pan; Winter algal bloom; Ice cover; Primary production; Genetic diversity
资金
- NKTH-OTKA CNK [80140]
- EnvEurope Life Environment [LIFE08ENV/IT/000339]
- Hungarian Academy of Sciences
Winter phytoplankton communities in the shallow alkaline pans of Hungary are frequently dominated by picoeukaryotes, sometimes in particularly high abundance. In winter 2012, the ice-covered alkaline Zab-sz,k pan was found to be extraordinarily rich in picoeukaryotic green algae (42-82 x 10(6) cells ml(-1)) despite the simultaneous presence of multiple stressors (low temperature and light intensity with high pH and salinity). The maximum photosynthetic rate of the picoeukaryote community was 1.4 mu g C mu g chlorophyll a (-1) h(-1) at 125 mu mol m(-2) s(-1). The assimilation rates compared with the available light intensity measured on the field show that the community was considerably light-limited. Estimated areal primary production was 180 mg C m(-2) d(-1). On the basis of the 18S rRNA gene analysis (cloning and DGGE), the community was phylogenetically heterogeneous with several previously undescribed chlorophyte lineages, which indicates the ability of picoeukaryotic communities to maintain high genetic diversity under extreme conditions.
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