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Abstract:

The patterns and mechanisms underlying the genetic structure of microbial populations remain unresolved. Herein we investigated the role played by two non-mutually exclusive models (i.e. isolation by distance and isolation by environment) in shaping the genetic structure of lacustrine populations of a microalga (a freshwater Bathycoccaceae) in the Argentinean Patagonia. To our knowledge, this was the first study to investigate the genetic population structure in a South American microorganism. Population-level analyses based on ITS1-5.8S-ITS2 sequences revealed high levels of nucleotide and haplotype diversity within and among populations. Fixation index and a spatially explicit Bayesian analysis confirmed the occurrence of genetically distinct microalga populations in Patagonia. Isolation by distance and isolation by environment accounted for 38.5% and 17.7% of the genetic structure observed, respectively, whereas together these models accounted for 41% of the genetic differentiation. While our results highlighted isolation by distance and isolation by environment as important mechanisms in driving the genetic population structure of the microalga studied, none of these models (either alone or together) could explain the entire genetic differentiation observed. The unexplained variation in the genetic differentiation observed could be the result of founder events combined with rapid local adaptations, as proposed by the monopolisation hypothesis. © FEMS 2017.

Registro:

Documento: Artículo
Título:Geographical distance and local environmental conditions drive the genetic population structure of a freshwater microalga (Bathycoccaceae; Chlorophyta) in Patagonian lakes
Autor:Fernández, L.D.; Hernández, C.E.; Romina Schiaffino, M.; Izaguirre, I.; Lara, E.
Filiación:Centro de Investigación en Recursos Naturales y Sustentabilidad (CIRENYS), Universidad Bernardo O'Higgins, Avenida Viel 1497, Santiago, Chile
Laboratory of Soil Biodiversity, Institute of Biology, University of Neuchâtel, Rue Emile Argand 11, Neucha○tel, CH-2000, Switzerland
Laboratorio de Ecología Evolutiva y Filoinformática, Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Barrio Universitario s/n, Concepción, 4030000, Chile
Centro de Investigaciones y transferencia del Noroeste de la Provincia de Buenos Aires, CONICET, UNNOBA, Junín, 6000, Argentina
Departamento de Ecología, Genética y Evolución, IEGEBA (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Real Jardín Botánico, CSIC, Plaza de Murillo 2, Madrid, 28014, Spain
Palabras clave:Freshwater protist; Gene flow; Mamiellophyceae; Microbial populations; Phytoplankton; Picoeukaryote; environmental conditions; eukaryote; freshwater environment; gene flow; genetic differentiation; genetic structure; lacustrine environment; microalga; microbial community; microorganism; phytoplankton; population structure; protist; Patagonia; Chlorophyta; Protista; spacer DNA; Argentina; Bayes theorem; classification; gene flow; genetic variation; genetics; geography; green alga; haplotype; lake; microalga; population genetics; reproductive isolation; Argentina; Bayes Theorem; Chlorophyta; DNA, Intergenic; Gene Flow; Genetic Variation; Genetics, Population; Geography; Haplotypes; Lakes; Microalgae; Reproductive Isolation
Año:2017
Volumen:93
Número:10
DOI: http://dx.doi.org/10.1093/femsec/fix125
Título revista:FEMS Microbiology Ecology
Título revista abreviado:FEMS Microbiol. Ecol.
ISSN:01686496
CODEN:FMECE
CAS:DNA, Intergenic
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01686496_v93_n10_p_Fernandez

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Citas:

---------- APA ----------
Fernández, L.D., Hernández, C.E., Romina Schiaffino, M., Izaguirre, I. & Lara, E. (2017) . Geographical distance and local environmental conditions drive the genetic population structure of a freshwater microalga (Bathycoccaceae; Chlorophyta) in Patagonian lakes. FEMS Microbiology Ecology, 93(10).
http://dx.doi.org/10.1093/femsec/fix125
---------- CHICAGO ----------
Fernández, L.D., Hernández, C.E., Romina Schiaffino, M., Izaguirre, I., Lara, E. "Geographical distance and local environmental conditions drive the genetic population structure of a freshwater microalga (Bathycoccaceae; Chlorophyta) in Patagonian lakes" . FEMS Microbiology Ecology 93, no. 10 (2017).
http://dx.doi.org/10.1093/femsec/fix125
---------- MLA ----------
Fernández, L.D., Hernández, C.E., Romina Schiaffino, M., Izaguirre, I., Lara, E. "Geographical distance and local environmental conditions drive the genetic population structure of a freshwater microalga (Bathycoccaceae; Chlorophyta) in Patagonian lakes" . FEMS Microbiology Ecology, vol. 93, no. 10, 2017.
http://dx.doi.org/10.1093/femsec/fix125
---------- VANCOUVER ----------
Fernández, L.D., Hernández, C.E., Romina Schiaffino, M., Izaguirre, I., Lara, E. Geographical distance and local environmental conditions drive the genetic population structure of a freshwater microalga (Bathycoccaceae; Chlorophyta) in Patagonian lakes. FEMS Microbiol. Ecol. 2017;93(10).
http://dx.doi.org/10.1093/femsec/fix125