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. 2020 Sep 10;11:521146. doi: 10.3389/fmicb.2020.521146

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Copyright © 2020 Díaz-Torres, Lugo-Melchor, de Anda, Gradilla-Hernández, Amézquita-López and Meza-Rodríguez.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Principal component analysis (PCA) of the physicochemical and environmental parameters; each vector represents a variable, and the correlation of two variables is reflected by the angle between the two corresponding vectors. Abbreviations: WT: water temperature; DO: dissolved oxygen; CON: electrical conductivity; TUR: turbidity; TA: air temperature; HUM: relative humidity; PREC: rainfall; and SAL: Salmonella. Code of the isolated Salmonella strains: First and/or second letter correspond to the sampling month (Ju: June; Jl: July; S: September; and O: October); the second and/or third letter indicate the sampling site (A, B, C, D, or E); and the penultimate number and letter refer to the depth (1, 2, 3, or 4 m).