title: A combined whelk watch suggests repeated TBT desorption pulses.
abstract: Environmental quality in coastal Europe has improved since the complete 2003 ban on the use of tributyltin (TBT) in antifouling paints. However, there is evidence that TBT is entering the water column, presumably from illegal practices. We determined the concentration of butyltins (BTs: TBT and derivatives) in populations of two gastropods, the rock snail Nucella lapillus (n=17) and the mud snail Nassarius reticulatus (n=18) at regular intervals from pre-ban times until 2009 and 2011, respectively, in NW Spain. Although a substantial decline in TBT occurred shortly after the ban, no significant changes were observed in either species over the last 3-year period of study. In addition, the proportion of TBT relative to the sum of BTs (a marker of recent pollution) in the most recent rock snail samples unexpectedly increased; this proportion therefore showed a generally decreasing but oscillatory trend over time. The results are consistent with the theoretical expectation of BT desorption from sediments; however, this natural phenomenon is now interpreted as a recurrent episode rather than a unique, transient event. Evidence of this subtle input improves our understanding of TBT persistence in the environment in Europe and worldwide.
authors.affiliation: Depto. BA, BV y Ecología, Universidade da Coruña, Rua da Fraga 10, 15008 Coruña, Spain. Electronic address: jmruiz@udc.es.
authors.forename: J M
authors.initials: JM
authors.lastname: Ruiz
authors.affiliation: Depto. BA, BV y Ecología, Universidade da Coruña, Rua da Fraga 10, 15008 Coruña, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Albaina
authors.affiliation: Depto. BA, BV y Ecología, Universidade da Coruña, Rua da Fraga 10, 15008 Coruña, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Carro
authors.affiliation: Depto. BA, BV y Ecología, Universidade da Coruña, Rua da Fraga 10, 15008 Coruña, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Barreiro
mesh_terms: D000818:Animals; D004784:Environmental Monitoring; D049851:Gastropoda / Q000378:metabolism*; D010150:Paint; D012623:Seawater / Q000737:chemistry; D013030:Spain; D014220:Trialkyltin Compounds / Q000378:metabolism* / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000378:metabolism* / Q000633:toxicity
chemical_list: D014220:Trialkyltin Compounds; D014874:Water Pollutants, Chemical; C011559:tributyltin
keywords: Biomonitoring; Butyltin; Gastropods; Nassarius reticulatus; Nucella lapillus; Tributyltin (TBT)