title: Levels of persistent organic pollutants in larvae of the damselfly Ischnura elegans (Odonata, Coenagrionidae) from different ponds in Flanders, Belgium.
abstract: We investigated the accumulation of persistent organic pollutants in damselfly larvae (Ischnura elegans) in sixteen ponds in Flanders (Belgium), widely differing in the surrounding land use. Concentrations of polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE) and hexachlorobenzene (HCB) were measured. From all targeted PBDE-congeners, only three congeners (IUPAC nos. 47, 99, 100) were above the limit of quantification (LOQ). The ∑PBDE concentrations ranged from <LOQ up to 0.51 ngg(-1) ww. From the targeted PCB-congeners, thirteen were detectable (IUPAC nos. 95, 99, 101, 105, 118, 138, 149, 153, 156, 170, 180, 183, and 187). A high variation in ∑PCB concentrations was observed between the ponds, ranging from <LOQ (0.67 ngg(-1) ww) up to 9.91 ngg(-1) ww in the damselflies from the pond at Sijsele. In all investigated Flemish ponds, p,p'-DDE concentrations were >LOQ (0.20 ngg(-1) ww) with values up to 3.30 ngg(-1) ww in the pond at Hamme. In fifteen ponds, the HCB concentrations were >LOQ (0.05 ngg(-1) ww) with values up to 0.24 ngg(-1) ww. For the available data in the literature a comparison with different species was done for some of the sampled ponds. The monitored ponds can be separated in three groups based on their contamination. The first group is characterised by a relative low POP content (∑PBDEs, ∑PCBs, HCB). Group 2 contained more HCB and p,p'-DDE than the overall mean while this was the case for PBDEs and PCBs in group 3. The vectors of both contaminated groups are situated nearly perpendicular which is suggesting a different pollution sources.
authors.affiliation: Department of Biology, Ecophysiology, Biochemistry and Toxicology Group, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. nander.vanpraet@ua.ac.be
authors.forename: Nander
authors.initials: N
authors.lastname: Van Praet
authors.forename: Adrian
authors.initials: A
authors.lastname: Covaci
authors.forename: Johannes
authors.initials: J
authors.lastname: Teuchies
authors.forename: Luc
authors.initials: L
authors.lastname: De Bruyn
authors.forename: Hans
authors.initials: H
authors.lastname: Van Gossum
authors.forename: Robby
authors.initials: R
authors.lastname: Stoks
authors.forename: Lieven
authors.initials: L
authors.lastname: Bervoets
mesh_terms: D000818:Animals; D001530:Belgium; D004784:Environmental Monitoring; D007814:Larva / Q000378:metabolism; D063191:Odonata / Q000254:growth & development / Q000378:metabolism*; D061005:Ponds / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical