Research Article
Ciliate food vacuole content and bacterial community composition in the warm-monomictic crater Lake Alchichica, México
Fernando Bautista-Reyes,
Miroslav Macek,
Corresponding Author
Fernando Bautista-Reyes
Posgrado en Ciencias del Mar y Limnología (PCMyL), Universidad Nacional Autónoma de México (UNAM), FES Iztacala, Tlalnepantla, Estado de México, México
Proyecto de Investigación en Limnología Tropical, UNAM, FES Iztacala, Tlalnepantla, Estado de México, México
Correspondence: Fernando Bautista-Reyes, Facultad de Estudios Superiores Iztacala, UNAM, Proyecto de Investigación en Limnología Tropical, Av. de los Barrios No. 1, Los Reyes Iztacala, Tlalnepantla, Estado de México 54090, Mexico. Tel.: +5255/56231333 ext. #39790; fax: +5255/53907604; e-mail: [email protected]Search for more papers by this authorMiroslav Macek
Proyecto de Investigación en Limnología Tropical, UNAM, FES Iztacala, Tlalnepantla, Estado de México, México
Academy of Sciences of the Czech Republic, Biology Centre, v.v.i., Institute of Hydrobiology, České Budějovice, Czech Republic
Search for more papers by this authorFernando Bautista-Reyes,
Miroslav Macek,
Corresponding Author
Fernando Bautista-Reyes
Posgrado en Ciencias del Mar y Limnología (PCMyL), Universidad Nacional Autónoma de México (UNAM), FES Iztacala, Tlalnepantla, Estado de México, México
Proyecto de Investigación en Limnología Tropical, UNAM, FES Iztacala, Tlalnepantla, Estado de México, México
Correspondence: Fernando Bautista-Reyes, Facultad de Estudios Superiores Iztacala, UNAM, Proyecto de Investigación en Limnología Tropical, Av. de los Barrios No. 1, Los Reyes Iztacala, Tlalnepantla, Estado de México 54090, Mexico. Tel.: +5255/56231333 ext. #39790; fax: +5255/53907604; e-mail: [email protected]Search for more papers by this authorMiroslav Macek
Proyecto de Investigación en Limnología Tropical, UNAM, FES Iztacala, Tlalnepantla, Estado de México, México
Academy of Sciences of the Czech Republic, Biology Centre, v.v.i., Institute of Hydrobiology, České Budějovice, Czech Republic
Search for more papers by this authorAbstract
To evaluate trophic relationships between ciliates and bacterioplankton during the stratification period in a lake, samples from three different layers [the upper part of the metalimnion (UM), the base of the metalimnion (BM) and the hypolimnion] were studied. The autotrophic picoplankton numbers, phylogenetic composition of heterotrophic picoplankton (HPP), and HPP composition in ciliates’ food vacuoles were analyzed. Additionally, in situ incubations in dialysis bags were performed at the same selected depths to assess potential changes in picoplankton composition related to ciliates’ feeding activity. Among the in situ HPP assemblage, no phylogenetic group dominated in the selected layers within the course of the study. The ciliate assemblage was dominated by scuticociliates, haptorids, and hypotrichs. Comparing ciliates’ food vacuole content and in situ HPP composition, a high preference for Alphaproteobacteria was found at all three depths. Planctomycetes, and Delta- and Gammaproteobacteria were selected at BM and hypolimnion, respectively. However, selection of a given phylogenetic group in the time course of this study was observed only for Alphaproteobacteria in the UM. Similar trends were found in the incubations, but no relationship was found between the vacuole content of the ciliates and changes in HPP composition.
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