Skip to content

Research at St Andrews

Linking organochlorine contaminants with demographic parameters in free-ranging common bottlenose dolphins from the northern Adriatic Sea

Research output: Contribution to journalArticle

Open Access Status

  • Embargoed (until 4/12/19)

Author(s)

Tilen Genov, Paul D. Jepson, Jonathan L. Barber, Ana Hace, Stefania Gaspari, Tina Centrih, Jan Lesjak, Polona Kotnjek

School/Research organisations

Abstract

Marine top predators, including marine mammals, are known to bio-accumulate persistent pollutants such as polychlorinated biphenyls (PCBs), a serious conservation concern for these species. Although PCBs declined in European seas since the 1970s–1980s ban, considerable levels still persist in European and Mediterranean waters. In cetaceans, stranded animals are a valuable source of samples for pollutant studies, but may introduce both known and unknown biases. Biopsy samples from live, free-ranging cetaceans offer a better alternative for evaluating toxicological burdens of populations, especially when linked to known histories of identified individuals. We evaluated PCB and other organochlorine contaminants in free-ranging common bottlenose dolphins (Tursiops truncatus) from the Gulf of Trieste (northern Adriatic Sea), one of the most human-impacted areas in the Mediterranean Sea. Biopsies were collected from 32 male and female dolphins during 2011–2017. All animals were photo-identified and are part of a well-known population of about 150 individuals monitored since 2002. We tested for the effects of sex, parity and social group membership on contaminant concentrations. Males had significantly higher organochlorine concentrations than females, suggesting offloading from reproducing females to their offspring via gestation and/or lactation. Furthermore, nulliparous females had substantially higher concentrations than parous ones, providing further support for maternal offloading of contaminants. Overall, 87.5% of dolphins had PCB concentrations above the toxicity threshold for physiological effects in experimental marine mammal studies (9 mg/kg lw), while 65.6% had concentrations above the highest threshold published for marine mammals based on reproductive impairment in ringed seals (41 mg/kg lw). The potential population-level effects of such high contaminant levels are of concern particularly in combination with other known or suspected threats to this population. We demonstrate the utility of combining contaminant data with demographic parameters such as sex, reproductive output, etc., resulting from long-term studies.
Close

Details

Original languageEnglish
Pages (from-to)200-212
Number of pages13
JournalScience of the Total Environment
Volume657
Early online date4 Dec 2018
DOIs
Publication statusPublished - 20 Mar 2019

    Research areas

  • Organochlorine contaminants, PCBs, Ecotoxicology, Adriatic Sea, Mediterranean Sea

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by journal

  1. Science of the Total Environment (Journal)

    Adam James Wyness (Member of editorial board)
    10 Jun 201810 Jul 2018

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

Related by journal

  1. Factors affecting the spatial and temporal distribution of E. coli in intertidal estuarine sediments

    Wyness, A. J., Paterson, D. M., Mendo, T., Defew, E. C., Stutter, M. I. & Avery, L. M., 15 Apr 2019, In : Science of the Total Environment. 661, p. 155-167

    Research output: Contribution to journalArticle

  2. Mercury in cetaceans: exposure, bioaccumulation and toxicity

    Kershaw, J. & Hall, A., 30 Jul 2019, In : Science of the Total Environment. 694, p. 1-11 11 p., 133683.

    Research output: Contribution to journalReview article

  3. Preconcentration techniques for trace explosive sensing

    Gillanders, R. N., Glackin, J. M. E., Filipi, J., Kezic, N., Samuel, I. D. W. & Turnbull, G. A., Mar 2019, In : Science of the Total Environment. 658, p. 650-658

    Research output: Contribution to journalArticle

  4. Concentration of perfluorinated compounds and cotinine in human foetal organs, placenta, and maternal plasma

    Mamsen, L. S., Jönsson, B. A. G., Lindh, C. H., Olesen, R. H., Larsen, A., Ernst, E., Kelsey, T. W. & Andersen, C. Y., 15 Oct 2017, In : Science of the Total Environment. 596-597, p. 97-105 9 p.

    Research output: Contribution to journalArticle

ID: 256853642