title: Methyl mercury bioaccumulation in long-finned eels, Anguilla dieffenbachii, from three rivers in Otago, New Zealand.
abstract: This research focuses on mercury (Hg) bioaccumulation in New Zealand long-tinned eels (Anguilla dieffenbachii) from the aquatic environment. Total Hg (HgT) and methyl mercury (MeHg) concentrations were determined in muscle tissue from eels living in three South Island rivers dominated respectively by urban, native bush and agricultural land-uses. Most of the Hg in eels was MeHg (> 84%) and the MeHg concentrations increased linearly with both length and eel age for a given river habitat. The annual growth rates for eels from the urban and agricultural streams were greater than for eels from the native bush stream. The average MeHg accumulation rate was significantly higher for the eels in the agricultural stream compared with either the urban or native bush catchments. These results are probably due to a combination of factors and further investigations in the lower food web are necessary to elucidate the exact mechanisms of MeHg bioaccumulation in these creatures.
authors.affiliation: Zoology Department, University of Otago, Dunedin, New Zealand.
authors.forename: A C
authors.initials: AC
authors.lastname: Redmayne
authors.forename: J P
authors.initials: JP
authors.lastname: Kim
authors.forename: G P
authors.initials: GP
authors.lastname: Closs
authors.forename: K A
authors.initials: KA
authors.lastname: Hunter
mesh_terms: D000367:Age Factors; D000818:Animals; D001827:Body Height; D001835:Body Weight; D004524:Eels; D005618:Fresh Water; D008767:Methylmercury Compounds / Q000032:analysis* / Q000378:metabolism; D009520:New Zealand; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D008767:Methylmercury Compounds; D014874:Water Pollutants, Chemical