34
Tecnología y Ciencias del Agua
, vol. VIII, núm. 3, mayo-junio de 2017, pp. 27-37
Aburto-Medina
et al
.
, Prevalence of
Enterobacteriaceae
and contaminants survey in sediments of the Atoyac River
•
ISSN 2007-2422
Thus, there may be health risks since these wa-
ters are later used to irrigate several crops such
as maize, sorghum, and alfalfa in lands above
the dam (Larenas-Bazán, 2010). Therefore, it
is of great importance to identify the effluents
located after the wastewater treatment process
and/or review the water quality coming out of
those treatment facilities, another aid would be
the use of microbial source tracking markers
such as the stanols (Derrien
et al
., 2012) in order
to identify faecal contamination sources. It is
equally important to look for catabolic and
pathogenicity genes in the environmental
samples in order to properly assess the mi-
crobial diversity degrading potential and its
pathogenicity.
Figure 2. Phylogenetic tree of the
Enterobacteriales
order based on partial 16SrDNA sequences showing the relationships among
bacterial clone sequences from this study and members of the
Enterobacteriaceae
family found in the database. Jukes and Cantor
distance, neighbour-joining method, outgroup:
Comamonas denitrifications
. Clones from this study are in bold, A: Atoyac.
A number in parenthesis indicates the number of clones obtained for each sequence. Accession numbers of the sequences
retrieved from the databases are also indicated in parenthesis. Bootstrap values above 50% are shown at branch nodes (per 1000
trials). 16S rRNA sequence similarity over the region 800 to 1390 based on
E. coli
numbering.
