Abstract
Isabel Lake is a moderate saline soda crater lake located in Isabel Island in the eastern tropical Pacific coast of Mexico. Lake is mainly formed by rainfall and is strongly affected by evaporation and high input of nutrients derived from excretions of a large bird community inhabiting the island. So far, only the island macrobiota has been studied. The knowledge of the prokaryotic biota inhabiting the upper layers of this meromictic lake can give clues for the maintenance of this ecosystem. We assessed the diversity and composition of prokaryotic community in sediments and water of the lake by DGGE profiling, 16S rRNA gene amplicon pyrosequencing, and cultivation techniques. The bacterial community is largely dominated by halophilic and halotolerant microorganisms. Alpha diversity estimations reveal higher value in sediments than in water (P > 0.005). The lake water is dominated by γ-Proteobacteria belonging to four main families where Halomonadaceae presents the highest abundance. Aerobic, phototrophic, and halotolerant prokaryotes such as Cyanobacteria GPIIa, Halomonas, Alcanivorax, Idiomarina, and Cyclobacterium genera are commonly found. However, in sediment samples, Formosa, Muricauda, and Salegentibacter genera corresponding to Flavobacteriaceae family accounted for 15–20 % of the diversity. Heterotrophs like those involved in sulfur cycle, Desulfotignum, Desulfuromonas, Desulfofustis, and Desulfopila, appear to play an important role in sediments. Finally, a collection of aerobic halophilic bacterial isolates was created from these samples; members of the genus Halomonas were predominantly isolated from lake water. This study contributes to state the bacterial diversity present in this particular soda saline crater lake.
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Acknowledgments
This work was supported by research grants CSD 2009–0006 of the Consolider-Ingenio programme and BIO2014-51953-P from the Spanish Ministerio de Ciencia e Innovación, currently the Ministerio de Economía y Competitividad, all including ERDF (European Regional Development Funds). JFAG was supported by a postdoctoral fellowship from CONACyT (Mexico). We wish to thank referees for their constructive commentaries which improved the manuscript.
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Figure S1
Location of Isabel Island in the Pacific coast of Mexico. Shape of Isabel Island and the crater-lake draw at scale. Sampling sites (1–3) for water and sediment collection are indicated by arrowheads\ (GIF 23 kb)
Figure S2
Bacterial diversity in Isabel soda-lake samples. Rarefaction analysis was based on Operational Taxonomic Units (OTU’s) established at 97 % sequence identity of partial 16S rRNA gene sequences of water and sediment samples from Isabel Island Lake (GIF 12 kb)
Figure S3
16S rRNA gene fingerprint of γ-Proteobacteria isolates from Isabel Island lake samples. Total DNA of selected isolates was digested, electrophoresed and vacuum-blotted onto nylon filters. A PCR fragment (340 bp) of Halomonas venusta (4WSA1) 16S rRNA gene was used as probe. Hybridization fingerprints point to different number of rrn operons (ranging from 2 to 5) according to the genus. Positions of DNA molecular size markers (kbp) are shown on left side (GIF 71 kb)
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Aguirre-Garrido, J.F., Ramírez-Saad, H.C., Toro, N. et al. Bacterial Diversity in the Soda Saline Crater Lake from Isabel Island, Mexico. Microb Ecol 71, 68–77 (2016). https://doi.org/10.1007/s00248-015-0676-6
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DOI: https://doi.org/10.1007/s00248-015-0676-6