Assessing the effect of persistent organic pollutants on reproductive activity in common dolphins and harbour porpoises

S Murphy, G J Pierce, R J Law, P Bersuder, P D Jepson, J A Learmonth, M Addink, W Dabin, M B Santos, R Deaville, B N Zegers, A Mets, E Rogan, V Ridoux, R J Reid, C Smeenk, T Jauniaux, A Lopez, J M Alonso Farre, A F Gonzalez & 4 others A Guerra, M García Hartmann, C Lockyer, J P Boon

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

toxins which present the greatest risk to consumers. We assessed the impacts of persistent organic pollutants (POPs) on two cetacean species that feed on commercially important fish species in the eastern North Atlantic; the common dolphin (Delphinus delphis) and the harbour porpoise (Phocoena phocoena). In order to evaluate the possible long-term effects of POPs on the continued viability of these populations, we investigated their effects on reproductive activity in females, using ovarian scars as an index of reproductive activity. In harbour porpoises, high POP burdens tended to be associated with lower ovarian scar number, possibly indicating that high contaminant levels were inhibiting ovulation, or some females may go through a number of infertile ovulations prior to a successful pregnancy, birth, and survival of their first offspring during early lactation. In contrast, initial results identified that the common dolphins with contaminant burdens above a threshold level for adverse
health effects in marine mammals (17 µg g-1 total PCBs lipid) were resting mature females, with high numbers of ovarian scars. This suggests that (a) due to high contaminant burdens, females may be unable to reproduce, thus continue ovulating, or (b) females are not reproducing for some other reason, either physical or social, and started accumulating higher levels of contaminants. Additional analyses were carried out on a control group of ''healthy'' D. delphis, i.e. stranded animals diagnosed as bycatch and were assessed for evidence of any infectious or non infectious disease that would inhibit reproduction. Results suggested that high contaminant burdens, above the threshold level, were not inhibiting ovulation, conception or implantation in female D. delphis, though the impact on the foetal survival rate (in both species) requires further examination. Investigations into accumulation and persistence of ovarian scars and use as an index of reproductive activity were also undertaken within this study.
Original languageEnglish
Pages (from-to)153-173
Number of pages21
JournalJournal of Northwest Atlantic Fishery Science
Volume42
Early online date27 May 2010
Publication statusPublished - 2010

Fingerprint

porpoise
dolphin
harbor
pollutant
lactation
cetacean
marine mammal
infectious disease
bycatch
pregnancy
toxin
effect
persistent organic pollutant
PCB
viability
persistence
lipid
animal
fish

Keywords

  • corpora albicantia
  • corpora lutea
  • Delphinus delphis
  • health
  • ovarian scars
  • persistent

Cite this

Murphy, S., Pierce, G. J., Law, R. J., Bersuder, P., Jepson, P. D., Learmonth, J. A., ... Boon, J. P. (2010). Assessing the effect of persistent organic pollutants on reproductive activity in common dolphins and harbour porpoises. Journal of Northwest Atlantic Fishery Science, 42, 153-173.

Assessing the effect of persistent organic pollutants on reproductive activity in common dolphins and harbour porpoises. / Murphy, S; Pierce, G J; Law, R J; Bersuder, P; Jepson, P D; Learmonth, J A; Addink, M; Dabin, W; Santos, M B; Deaville, R; Zegers, B N; Mets, A; Rogan, E; Ridoux, V; Reid, R J; Smeenk, C; Jauniaux, T; Lopez, A; Alonso Farre, J M; Gonzalez, A F; Guerra, A; García Hartmann, M; Lockyer, C; Boon, J P.

In: Journal of Northwest Atlantic Fishery Science, Vol. 42, 2010, p. 153-173.

Research output: Contribution to journalArticle

Murphy, S, Pierce, GJ, Law, RJ, Bersuder, P, Jepson, PD, Learmonth, JA, Addink, M, Dabin, W, Santos, MB, Deaville, R, Zegers, BN, Mets, A, Rogan, E, Ridoux, V, Reid, RJ, Smeenk, C, Jauniaux, T, Lopez, A, Alonso Farre, JM, Gonzalez, AF, Guerra, A, García Hartmann, M, Lockyer, C & Boon, JP 2010, 'Assessing the effect of persistent organic pollutants on reproductive activity in common dolphins and harbour porpoises', Journal of Northwest Atlantic Fishery Science, vol. 42, pp. 153-173.
Murphy, S ; Pierce, G J ; Law, R J ; Bersuder, P ; Jepson, P D ; Learmonth, J A ; Addink, M ; Dabin, W ; Santos, M B ; Deaville, R ; Zegers, B N ; Mets, A ; Rogan, E ; Ridoux, V ; Reid, R J ; Smeenk, C ; Jauniaux, T ; Lopez, A ; Alonso Farre, J M ; Gonzalez, A F ; Guerra, A ; García Hartmann, M ; Lockyer, C ; Boon, J P. / Assessing the effect of persistent organic pollutants on reproductive activity in common dolphins and harbour porpoises. In: Journal of Northwest Atlantic Fishery Science. 2010 ; Vol. 42. pp. 153-173.
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