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Temporal and Spatial Dynamics of Archaeal Communities in Two Freshwater Lakes at Different Trophic Status.

Yang Y, Dai Y, Wu Z, Xie S, Liu Y - Front Microbiol (2016)

Bottom Line: In summer, archaeaplankton abundance generally decreased in Dianchi Lake but increased in Erhai Lake, while archaeaplankton diversity increased in both lakes.Moreover, in summer, lake sediment archaeal abundance considerably decreased.Bathyarchaeota was an important component of sediment archaeal community.

View Article: PubMed Central - PubMed

Affiliation: State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University Beijing, China.

ABSTRACT
In either eutrophic Dianchi Lake or mesotrophic Erhai Lake, the abundance, diversity, and structure of archaeaplankton communities in spring were different from those in summer. In summer, archaeaplankton abundance generally decreased in Dianchi Lake but increased in Erhai Lake, while archaeaplankton diversity increased in both lakes. These two lakes had distinct archaeaplankton community structure. Archaeaplankton abundance was influenced by organic content, while trophic status determined archaeaplankton diversity and structure. Moreover, in summer, lake sediment archaeal abundance considerably decreased. Sediment archaeal abundance showed a remarkable spatial change in spring but only a slight one in summer. The evident spatial change of sediment archaeal diversity occurred in both seasons. In Dianchi Lake, sediment archaeal community structure in summer was remarkably different from that in spring. Compared to Erhai Lake, Dianchi Lake had relatively high sediment archaeal abundance but low diversity. These two lakes differed remarkably in sediment archaeal community structure. Trophic status determined sediment archaeal abundance, diversity and structure. Archaeal diversity in sediment was much higher than that in water. Water and sediment habitats differed greatly in archaeal community structure. Euryarchaeota predominated in water column, but showed much lower proportion in sediment. Bathyarchaeota was an important component of sediment archaeal community.

No MeSH data available.


Abundance of archaeal 16S rRNA gene in spring and summer water samples (A) and sediment samples (B) from different sampling locations in Dianchi Lake and Erhai Lake. Different letters above the columns indicate the significant differences (P < 0.05).
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Figure 1: Abundance of archaeal 16S rRNA gene in spring and summer water samples (A) and sediment samples (B) from different sampling locations in Dianchi Lake and Erhai Lake. Different letters above the columns indicate the significant differences (P < 0.05).

Mentions: The density of planktonic archaeal 16S rRNA gene ranged from 1.03 ± 0.07 × 107 to 8.2 ± 0.48 × 107 copies per L water in Dianchi Lake, whereas waters in Erhai Lake had the archaeal community size of 6.75 ± 1.71 × 105 to 1.75 ± 0.06 × 108 16S rRNA gene copies per L water (Figure 1A). In spring, archaeaplankton abundance at sampling site D2 significantly outnumbered that at sampling sites D3, D4, D5 and D6 (P < 0.05), and the significant difference in archaeaplankton abundance was also observed between sites D1 and D3 (or D4). In summer, archaeaplankton abundance at site D1 was significantly higher than that at other five sites (P < 0.05), and archaeaplankton was more abundant at site D2 than at sites D3, D5, and D6 (P < 0.05). These results displayed the considerable spatial fluctuation of archaeaplankton abundance in Dianchi Lake in both spring and summer. At a given sampling site in Dianchi Lake, the significant difference in archaeaplankton abundance could be observed between spring and summer water samples (P < 0.05). The summer water sample generally had much lower archaeaplankton abundance than the corresponding spring one. Moreover, the six spring waters from Erhai Lake illustrated no significant difference in archaeaplankton abundance (P> 0.05), suggesting the relatively slight spatial shift in archaeaplankton abundance. However, in summer, archaeaplankton abundance at sites E1, E3, and E4 was significantly lower than that at other three sites (P < 0.05), illustrating the remarkable spatial variation of archaeaplankton abundance. At a given sampling site in Erhai Lake, archaeaplankton abundance considerably increased in summer. In addition, Dianchi Lake had higher archaeaplankton abundance than Erhai Lake in spring, while an opposite trend was found in summer.


Temporal and Spatial Dynamics of Archaeal Communities in Two Freshwater Lakes at Different Trophic Status.

Yang Y, Dai Y, Wu Z, Xie S, Liu Y - Front Microbiol (2016)

Abundance of archaeal 16S rRNA gene in spring and summer water samples (A) and sediment samples (B) from different sampling locations in Dianchi Lake and Erhai Lake. Different letters above the columns indicate the significant differences (P < 0.05).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
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Figure 1: Abundance of archaeal 16S rRNA gene in spring and summer water samples (A) and sediment samples (B) from different sampling locations in Dianchi Lake and Erhai Lake. Different letters above the columns indicate the significant differences (P < 0.05).
Mentions: The density of planktonic archaeal 16S rRNA gene ranged from 1.03 ± 0.07 × 107 to 8.2 ± 0.48 × 107 copies per L water in Dianchi Lake, whereas waters in Erhai Lake had the archaeal community size of 6.75 ± 1.71 × 105 to 1.75 ± 0.06 × 108 16S rRNA gene copies per L water (Figure 1A). In spring, archaeaplankton abundance at sampling site D2 significantly outnumbered that at sampling sites D3, D4, D5 and D6 (P < 0.05), and the significant difference in archaeaplankton abundance was also observed between sites D1 and D3 (or D4). In summer, archaeaplankton abundance at site D1 was significantly higher than that at other five sites (P < 0.05), and archaeaplankton was more abundant at site D2 than at sites D3, D5, and D6 (P < 0.05). These results displayed the considerable spatial fluctuation of archaeaplankton abundance in Dianchi Lake in both spring and summer. At a given sampling site in Dianchi Lake, the significant difference in archaeaplankton abundance could be observed between spring and summer water samples (P < 0.05). The summer water sample generally had much lower archaeaplankton abundance than the corresponding spring one. Moreover, the six spring waters from Erhai Lake illustrated no significant difference in archaeaplankton abundance (P> 0.05), suggesting the relatively slight spatial shift in archaeaplankton abundance. However, in summer, archaeaplankton abundance at sites E1, E3, and E4 was significantly lower than that at other three sites (P < 0.05), illustrating the remarkable spatial variation of archaeaplankton abundance. At a given sampling site in Erhai Lake, archaeaplankton abundance considerably increased in summer. In addition, Dianchi Lake had higher archaeaplankton abundance than Erhai Lake in spring, while an opposite trend was found in summer.

Bottom Line: In summer, archaeaplankton abundance generally decreased in Dianchi Lake but increased in Erhai Lake, while archaeaplankton diversity increased in both lakes.Moreover, in summer, lake sediment archaeal abundance considerably decreased.Bathyarchaeota was an important component of sediment archaeal community.

View Article: PubMed Central - PubMed

Affiliation: State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University Beijing, China.

ABSTRACT
In either eutrophic Dianchi Lake or mesotrophic Erhai Lake, the abundance, diversity, and structure of archaeaplankton communities in spring were different from those in summer. In summer, archaeaplankton abundance generally decreased in Dianchi Lake but increased in Erhai Lake, while archaeaplankton diversity increased in both lakes. These two lakes had distinct archaeaplankton community structure. Archaeaplankton abundance was influenced by organic content, while trophic status determined archaeaplankton diversity and structure. Moreover, in summer, lake sediment archaeal abundance considerably decreased. Sediment archaeal abundance showed a remarkable spatial change in spring but only a slight one in summer. The evident spatial change of sediment archaeal diversity occurred in both seasons. In Dianchi Lake, sediment archaeal community structure in summer was remarkably different from that in spring. Compared to Erhai Lake, Dianchi Lake had relatively high sediment archaeal abundance but low diversity. These two lakes differed remarkably in sediment archaeal community structure. Trophic status determined sediment archaeal abundance, diversity and structure. Archaeal diversity in sediment was much higher than that in water. Water and sediment habitats differed greatly in archaeal community structure. Euryarchaeota predominated in water column, but showed much lower proportion in sediment. Bathyarchaeota was an important component of sediment archaeal community.

No MeSH data available.