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A weight-of-evidence approach to assessing the ecological impact of organotin pollution in Dutch marine and brackish waters; combining risk prognosis and field monitoring using common periwinkles (Littorina littorea) Schipper, C.A.; Smit, M.G.D.; Kaag, N.H.B.M.; Vethaak, A.D. (2008). A weight-of-evidence approach to assessing the ecological impact of organotin pollution in Dutch marine and brackish waters; combining risk prognosis and field monitoring using common periwinkles (Littorina littorea). Mar. Environ. Res. 66(2): 231-239. http://dx.doi.org/10.1016/j.marenvres.2008.02.070 In: Marine Environmental Research. Applied Science Publishers: Barking. ISSN 0141-1136; e-ISSN 1879-0291, meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 281400 [ aanvragen ]

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Trefwoorden

Gastropoda [WoRMS] Marien/Kust; Brak water

Author keywords

Gastropods; Harbours; Tributyltin; Intersex; Risk assessment; Sediments; SPM

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Auteurs		Top
Schipper, C.A. Smit, M.G.D. Kaag, N.H.B.M. Vethaak, A.D.

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Abstract

In the present study an integrated ecological risk assessment based on multiple lines of evidence (LOEs) was evaluated in order to better assess the risk from TBT in Dutch harbours and open coastal waters. On the basis of spatial distributions of measured tributyltin (TBT) concentrations in sediments and suspended matter, predictions of the intersex index (ISI) in Littorina littorea and the ecological risk expressed as the Potentially Affected Fraction (PAF) of species were made. The results were compared to actual ISI measurements and presence of L. littorea in the field. The PAF calculated on the basis of TBT levels for open coastal waters ranged from 4.2% to 15.3%; for harbours it ranged from 3.5% to 26.9%. Significant intersex levels were observed only in waters where the risk was calculated above 10% PAF. This study suggests that the absence of L. littorea from some harbours with high ecological risk values can be explained by high TBT concentrations. A call is made for the use of integrated approaches like weight-of-evidence (WOE) to help practitioners improve ecological risk assessment.

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