Concomitant antibiotic and mercury resistance among gastrointestinal microflora of feral brook trout, Salvelinus fontinalis

Matthew M. Meredith, Erin M. Parry, Justin A. Guay, Nicholas O. Markham, G. Russell Danner, Keith A. Johnson, Tamar Barkay, Frank A. Fekete

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Twenty-nine bacterial isolates representing eight genera from the gastrointestinal tracts of feral brook trout Salvelinus fontinalis (Mitchell) demonstrated multiple maximal antibiotic resistances and concomitant broad-spectrum mercury (Hg) resistance. Equivalent viable plate counts on tryptic soy agar supplemented with either 0 or 25 μM HgCl2 verified the ubiquity of mercury resistance in this microbial environment. Mercury levels in lake water samples measured 1.5 ng L-1; mercury concentrations in fish filets ranged from 81.8 to 1,080 ng g-1 and correlated with fish length. The presence of similar antibiotic and Hg resistance patterns in multiple genera of gastrointestinal microflora supports a growing body of research that multiple selective genes can be transferred horizontally in the presence of an unrelated individual selective pressure.We present data that bioaccumulation of non-point source Hg pollution could be a selective pressure to accumulate both antibiotic and Hg resistant bacteria.

Original languageEnglish (US)
Pages (from-to)575-582
Number of pages8
JournalCurrent Microbiology
Volume65
Issue number5
DOIs
StatePublished - Nov 2012

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