title: Can a pollution event be detected using a single biological effects monitoring method?
abstract: The trends of malformation prevalence in embryos of dab, Limanda limanda, in the southern North Sea after the year 1990 mirrored the drop in major pollutants in the rivers draining into the German Bight. Despite this general decline, we detected a pollution event in the southern North Sea in winter 1995/1996 employing the prevalence of malformations in pelagic dab embryos as an indicator. An abrupt rise in malformation prevalence in the embryos of dab, corresponded to a dramatic increase in DDT levels in parent fish from the same area, indicating a hitherto unnoticed introduction of considerable quantities of DDT into the system.
authors.affiliation: Alfred-Wegener-Institute for Marine and Polar Research, Biologische Anstalt Helgoland-Columbusstrasse, 27568 Bremerhaven, Germany.
authors.forename: H
authors.initials: H
authors.lastname: von Westernhagen
authors.forename: V
authors.initials: V
authors.lastname: Dethlefsen
authors.forename: M
authors.initials: M
authors.lastname: Haarich
mesh_terms: D000818:Animals; D015415:Biomarkers; D000013:Congenital Abnormalities / Q000662:veterinary*; D003634:DDT / Q000009:adverse effects*; D004625:Embryo, Nonmammalian; D004784:Environmental Monitoring / Q000379:methods*; D005399:Fishes; D011157:Population Dynamics; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000009:adverse effects*
chemical_list: D015415:Biomarkers; D014874:Water Pollutants, Chemical; D003634:DDT