Nontargeted biomonitoring of halogenated organic compounds in two ecotypes of bottlenose dolphins (Tursiops truncatus) from the Southern California Bight

TitleNontargeted biomonitoring of halogenated organic compounds in two ecotypes of bottlenose dolphins (Tursiops truncatus) from the Southern California Bight
Publication TypeJournal Article
Year of Publication2015
AuthorsShaul N.J, Dodder N.G, Aluwihare LI, Mackintosh S.A, Maruya K.A, Chivers SJ, Danil K., Weller D.W, Hoh E.
JournalEnvironmental Science & Technology
Volume49
Pagination1328-1338
Date Published2015/02
Type of ArticleArticle
ISBN Number0013-936X
Accession NumberWOS:000349060300013
Keywordsdimethyl bipyrroles; gc/ecni-ms; ionization-mass-spectrometry; lions zalophus-californianus; marine mammals; natural-product; polybrominated diphenyl ethers; polychlorinated terphenyls; q1; risk-assessment
Abstract

Targeted environmental monitoring reveals contamination by known chemicals, but may exclude potentially pervasive but unknown compounds. Marine mammals are sentinels of persistent and bioaccumulative contaminants due to their longevity and high trophic position. Using nontargeted analysis, we constructed a mass spectral library of 327 persistent and bioaccumulative compounds identified in blubber from two ecotypes of common bottlenose dolphins (Tursiops truncatus) sampled in the Southern California Bight. This library of halogenated organic compounds (HOCs) consisted of 180 anthropogenic contaminants, 41 natural products, 4 with mixed sources, 8 with unknown sources, and 94 with partial structural characterization and unknown sources. The abundance of compounds whose structures could not be fully elucidated highlights the prevalence of undiscovered HOCs accumulating in marine food webs. Eighty-six percent of the identified compounds are not currently monitored, including 133 known anthropogenic chemicals. Compounds related to dichlorodiphenyltrichloroethane (DDT) were the most abundant. Natural products were, in some cases, detected at abundances similar to anthropogenic compounds. The profile of naturally occurring HOCs differed between ecotypes, suggesting more abundant offshore sources of these compounds. This nontargeted analytical framework provided a comprehensive list of HOCs that may be characteristic of the region, and its application within monitoring surveys may suggest new chemicals for evaluation.

DOI10.1021/es505156q
Short TitleEnviron. Sci. Technol.
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