INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Differences in bacterial community level physiological profiles between deep and shallow North-Patagonian Andean lakes
Autor/es:
MODENUTTI B.; DIAZ VILLANUEVA, V.; BASTIDAS NAVARRO M.
Revista:
FUNDAMENTAL AND APPLIED LIMNOLOGY
Editorial:
E SCHWEIZERBARTSCHE VERLAGS
Referencias:
Lugar: Stuttgart; Año: 2018 vol. 192 p. 91 - 102
ISSN:
1863-9135
Resumen:
The utilization of carbon substrates by bacteria results in a process of great ecological significance for aquatic ecosystems. Bacteria are capable of consuming a wide range of organic molecules, but despite the highly diverse functional abilities, environmental availabilities can influence the composition of the community. Thus, differences in Dissolved Organic Matter (DOM) and nutrients bulk between shallow and deep lakes would affect bacteria metabolic capacities. Here we used the metabolic profiles obtained with Biolog EcoPlates® as a proxy of bacterial processing of DOM. We compared bacteria community level physiological profile (CLPP) in 20 North-Andean Patagonian lakes, including shallow (piedmont and high altitude, Zmax less than 15 m) and deep piedmont lakes (Zmax more than 70 m). In addition, we carried out an incubation experiment of bacteria communities of one shallow lake with an enrichment with algal exudates or leaf leachates, and we assessed the responses as CLPP. Our results showed that the lakes have contrasting limnological features that can be related with the obtained CLPP. Shallow lakes had higher nutrient and DOC concentration than deep lakes and high altitude shallow lakes. Accordingly, bacteria communities CLPP differed between piedmont shallow lakes and deep lakes, with a higher ability of using carboxylic acids in deep lakes. The incubation experiment showed that bacteria can develope different metabolic capacities depending on the DOM (leachates vs. algal exudates) offered during incubation, increasing the consumption of the carbohydrate D-cellobiose in the algal exudate treatment. Our results showed that resource availability (concentration and origin) are important drivers of the bacterial community metabolic capacities.