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  • 1.
    Elmhagen, Bodil
    et al.
    Stockholms universitet.
    Kindberg, Jonas
    Svenska Jägareförbundet.
    Hellström, Peter
    Swedish Museum of Natural History, Department of.
    Angerbjörn, Anders
    Stockholms universitet.
    A boreal invasion in response to climate change? Range shifts and community effects in the borderland between forest and tundra2015In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209Article in journal (Refereed)
  • 2.
    Helander, Björn
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Asplund, Lillemor
    Stockholms universitet.
    Using raptors as environmental sentinels: Monitoring the white-tailed sea eagle Haliaeetus albicilla in Sweden2008In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 37, no 6, p. 425-431Article in journal (Refereed)
    Abstract [en]

    This paper summarizes results from the monitoring of reproduction of white-tailed sea eagle in Sweden 1965–2006. Since 1989 the eagle population on the Swedish Baltic coast has been included in the National Environment Monitoring Program as an indicator species for potentially harmful chemicals. The percentage of successfully reproducing pairs and nestling brood size decreased in synchrony with rising concentrations of contaminants in the 1950s on into the 1970s. Mean productivity was 1.3 young per pair prior to 1950 and decreased to 0.3 in 1965–1985. Dichlorodiphenyldichloroethene (DDE) in eagle eggs decreased from a range of annual means in 1965–1974 of 600-1200 lg g1 (lipid weight) to 60–140 lg g1 in 1996–2005. Total polychlorinated biphenyl (PCB) concentrations averaged above 1000 lg g1 into the early 1980s and remained in the range of 250–500 lg g1 in 1996–2005. Productivity began to improve when concentrations of DDE and PCBs dropped below approximately 300 and 800 lg g1, respectively. Brood size remains below the pre-1950level in one coastal region, indicating a possible impact from other contaminants. The power to detect significant trends under the program is presented and discussed: if white-tailed sea eagle reproduction had been monitored earlier during the 20th century, the negative impact of dichlorodiphenyltrichloroethane (DDT, source of DDE) would have been signaled as early as the 1950s in the Baltic Sea. The dramatic fall of white-tailed sea eagle reproduction under the influence of DDT and PCBs, and the subsequent rise following their ban, illustrates the usefulness of raptors like sea eagles as sentinels for environmental pollutants.

  • 3.
    Helander, Björn
    et al.
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Bignert, Anders
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Harbour Seal (Phoca vitulina) on the Swedish Baltic Coast: Population Trends and Reproduction.1992In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 21, no 8, p. 504-510Article in journal (Refereed)
  • 4.
    Helander, Björn
    et al.
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Olsson, Anders
    Stockholm University .
    Bignert, Anders
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Asplund, Lillemor
    Stockholm University.
    Litzén, Kerstin
    Stockholm University .
    The Role of DDE, PCB, Coplanar PCB and Eggshell Parameters for Reproduction in the White-tailed Sea Eagle (Haliaeetus albicilla) in Sweden.2002In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 31, no 5, p. 386-403Article in journal (Refereed)
    Abstract [en]

    The reproduction of white-tailed sea eagles was monitoredin1964–1999 in 3 differently contaminated sub-populations: BalticSea coast (Bp), inland central Sweden (Ip) and Lapland (Lp). 249dead eggs from 205 clutches were obtained for analyses of DDEand PCBs and for eggshell measurements. A desiccation index(Di) value was calculated for each egg as a measure of waterloss through the shell. In the highly contaminated Bp, p,p´-DDEconcentrations in the eggs decreased continuously and 5-foldduring the study period and PCB concentrations decreased 3-fold from the mid 1980s. The PCB pattern changed slightly overtime towards more high-chlorinated congeners but the relativetoxicity of the PCB mixture, expressed as 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (TEQ), remained constant and TEQcan be assumed to have decreased in a similar way as PCB overtime. Productivity (P), shell thickness (St), shell index (Si) and Diincreased over time in the Bp but no change in Di or productivityoccurred in the Lp, where residue concentrations were 5–8 timeslower. P of the Bp was not correlated to St or Si but was negatively correlated to Di, DDE and PCB. An S-shaped doseresponse relationship was indicated between P and DDE. After1988, when the PCB/DDE ratio was considerably higher thanpreviously, PCB but not DDE concentrations were significantlyhigher in eggs with dead embryos as compared to undevelopedeggs, implying lethal concentrations of PCB, and a LOEL of 320pg g–1 TEQ is suggested for embryo mortality. In a subset of 21eggs, representing productive and unproductive females, analyzed for a selection of coplanar PCB congeners, tris(4-chlorophenyl) methanol and bis(4-chlorophenyl) sulphone, there wasno evidence for a correlation between P and any of these compounds. A reduction in residue concentrations in old females didnot lead to increased P or improved Di-values, indicating aremaining effect from a previous, higher exposure to contaminants. The inability to reproduce included a high rate ofundeveloped eggs, indicating effects at a prezygotic stage. Pshowed the strongest correlation with Di, and Di was moststrongly correlated to DDE. Thus, the remaining effect of previousexposure resulted in a stronger correlation to the symptom (Di)rather than to the suggested causative agent (DDE). LOEL valuesfor depressed P were estimated at 120 µg g–1 DDE and 500 µgg–1 PCB (lipid basis). It is concluded that the major reason fordepressed P during the study period was DDE, but that effectsalso from PCB were largely concealed by the effects from DDE.

  • 5. Kullberg, Cecilia
    et al.
    Fransson, Thord
    Swedish Museum of Natural History, Department of.
    Hedlund, Johanna
    Jonzén, Niclas
    Langvall, Ola
    Nilsson, Johan
    Bolmgren, Kjell
    Change in spring arrival of migratory birds under an era of climate change, Swedish data from the last 140 years2015In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 44, no Suppl. 1, p. S69-S77Article in journal (Refereed)
  • 6.
    Nyberg, Elisabeth
    et al.
    Swedish Museum of Natural History, Department of.
    Danielsson, Sara
    Swedish Museum of Natural History, Department of.
    Eriksson, Ulla
    Stockholm university.
    Faxneld, Suzanne
    Swedish Museum of Natural History, Department of.
    Miller, Aroha
    Swedish Museum of Natural History, Department of.
    Bignert, Anders
    Swedish Museum of Natural History, Department of.
    Spatio-temporal trends of PCBs in the Swedish freshwater environment, 1981-20122014In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 43, p. 45-57Article in journal (Refereed)
  • 7.
    Nyberg, Elisabeth
    et al.
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Faxneld, Suzanne
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Danielsson, Sara
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Eriksson, Ulla
    Stockholms universitet.
    Miller, Aroha
    University of British Columbia.
    Bignert, Anders
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Temporal and spatial trends of PCBs, DDts, HCHs, and HCB in Swedish marine biota 1969-20122015In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 44, no Supplement 3, p. 484-497Article in journal (Refereed)
1 - 7 of 7
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