Détail de la notice
Titre du Document
Community structure and physiological characterization of microbial mats in Byers Peninsula, Livingston Island (South Shetland Islands, Antarctica)
Auteur(s)
FERNANDEZ-VALIENTE Eduardo ; CAMACHO Antonio ; ROCHERA Carlos ; ...
Résumé
The community structure and physiological characteristics of three microbial mat communities in Byers Peninsula (Livingston Island, South Shetland Islands, Antarctica) were compared. One of the mats was located at the edge of a stream and was dominated by diatoms (with a thin basal layer of oscillatorian cyanobacteria), whereas the other two mats, located over moist soil and the bottom of a pond, respectively, were dominated by cyanobacteria throughout their vertical profiles. The predominant xanthophyll was fucoxanthin in the stream mat and myxoxanthophyll in the cyanobacteria-dominated mats. The sheath pigment scytonemin was absent in the stream mat but present in the soil and pond mats. The stream mat showed significantly lower 613C and higher 615N values than the other two mats. Consistent with the δ15N values, N2 fixation was negligible in the stream mat. The soil mat was the physiologically most active community. It showed rates of photosynthesis three times higher than in the other mats, and had the highest rates of ammonium uptake, nitrate uptake and N2 fixation. These observations underscore the taxonomic and physiological diversity of microbial mat communities in the maritime Antarctic region.
Editeur
Blackwell
Identifiant
PMID : 17069622 ISSN : 0168-6496
Source
FEMS microbiology ecology A. 2007, vol. 59, n° 2, pp. 377-385 [9 pages] [bibl. : 1 p.1/4]
Langue
Anglais
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