Multivariate and phylogenetic analyses assessing the response of bacterial mat communities from an ancient oligotrophic aquatic ecosystem to different scenarios of long-term environmental disturbance

PloS One
Silvia PajaresLuis E Eguiarte

Abstract

Understanding the response of bacterial communities to environmental change is extremely important in predicting the effect of biogeochemical modifications in ecosystem functioning. The Cuatro Cienegas Basin is an ancient oasis in the Mexican Chihuahuan desert that hosts a wide diversity of microbial mats and stromatolites that have survived in extremely oligotrophic pools with nearly constant conditions. However, thus far, the response of these unique microbial communities to long-term environmental disturbances remains unexplored. We therefore studied the compositional stability of these bacterial mat communities by using a replicated (3x) mesocosm experiment: a) Control; b) Fluct: fluctuating temperature; c) 40C: increase to 40 ºC; d) UVplus: artificial increase in UV radiation; and f) UVmin: UV radiation protection. In order to observe the changes in biodiversity, we obtained 16S rRNA gene clone libraries from microbial mats at the end of the experiment (eight months) and analyzed them using multivariate and phylogenetic tools. Sequences were assigned to 13 major lineages, among which Cyanobacteria (38.8%) and Alphaproteobacteria (25.5%) were the most abundant. The less extreme treatments (Control and UVmin) had a more simi...Continue Reading

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Citations

Nov 15, 2017·Scientific Reports·Bernadette C ProemseLeon A Barmuta
May 10, 2017·PeerJ·Hector Fernando Arocha-GarzaSusana De la Torre-Zavala

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Methods Mentioned

BETA
environmental stress
PCR

Software Mentioned

Seqmatch
PERMANOVA
Chimera check Bellerophon
gplots
R
Bioedit
Tree of Life
Picante
vegan
Mothur

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