Microbes can modulate ecosystem function since they harbor a vast genetic potential for biogeochemical cycling. The spatial and temporal dynamics of this genetic diversity should be acknowledged to establish a link between ecosystem function and community structure. In this study, we analyzed the genetic diversity of bacterial phosphorus utilization genes in two microbial assemblages, microbialites and bacterioplankton of Lake Alchichica, a semiclosed (i.e., endorheic) system with marked seasonality that varies in nutrient conditions, temperature, dissolved oxygen, and water column stability. We focused on dissolved organic phosphorus (DOP) utilization gene dynamics during contrasting mixing and stratification periods. Bacterial alkaline phosphatases (phoX and phoD) and alkaline beta-propeller phytases (bpp) were surveyed. DOP utilization genes showed different dynamics evidenced by a marked change within an intra-annual period and a differential circadian pattern of expression. Although Lake Alchichica is a semiclosed system, this dynamic turnover of phylotypes (from lake circulation to stratification) points to a different potential of DOP utilization by the microbial communities within periods. DOP utilization gene dynamics was different among genetic markers and among assemblages (microbialite vs. bacterioplankton). As estimated by the system's P mass balance, P inputs and outputs were similar in magnitude (difference was <10 %). A theoretical estimation of water column P monoesters was used to calculate the potential P fraction that can be remineralized on an annual basis. Overall, bacterial groups including Proteobacteria (Alpha and Gamma) and Bacteroidetes seem to be key participants in DOP utilization responses.
- MeSH
- alkalická fosfatasa genetika MeSH
- Bacteria enzymologie genetika metabolismus MeSH
- Bacteroidetes genetika metabolismus MeSH
- bakteriální geny genetika MeSH
- bakteriální RNA analýza MeSH
- DNA bakterií analýza MeSH
- ekosystém MeSH
- fosfor chemie metabolismus MeSH
- fylogeneze * MeSH
- genetická variace * MeSH
- genetické markery genetika MeSH
- jezera mikrobiologie MeSH
- kyslík chemie MeSH
- polymerázová řetězová reakce metody MeSH
- Proteobacteria genetika metabolismus MeSH
- regulace genové exprese u bakterií MeSH
- roční období MeSH
- sekvence nukleotidů MeSH
- sekvenční analýza MeSH
- sloučeniny fosforu chemie metabolismus MeSH
- voda chemie MeSH
- vodní organismy genetika metabolismus MeSH
- životní prostředí MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Mexiko MeSH
