Isotopic signatures and mercury content of arctic char and their prey, and water chemistry of 18 arctic Canadian lakes


Autoria(s): Gantner, Nikolaus; Power, Michael; Iqaluk, Deborah; Meili, Markus; Borg, Hans; Sundbom, Marcus; Solomon, Keith R; Lawson, Greg; Muir, Derek CG
Cobertura

MEDIAN LATITUDE: 74.295945 * MEDIAN LONGITUDE: -85.003728 * SOUTH-BOUND LATITUDE: 61.280000 * WEST-BOUND LONGITUDE: -107.750000 * NORTH-BOUND LATITUDE: 82.110000 * EAST-BOUND LONGITUDE: -67.480000

Data(s)

12/04/2010

Resumo

Concentrations of mercury (Hg) have increased slowly in landlocked Arctic char over a 10- to 15-year period in the Arctic. Fluxes of Hg to sediments also show increases in most Arctic lakes. Correlation of Hg with trophic level (TL) was used to investigate and compare biomagnification of Hg in food webs from lakes in the Canadian Arctic sampled from 2002 to 2007. Concentrations of Hg (total Hg and methylmercury [MeHg]) in food webs were compared across longitudinal and latitudinal gradients in relation to d13C and d15N in periphyton, zooplankton, benthic invertebrates, and Arctic char of varying size-classes. Trophic magnification factors (TMFs) were calculated for the food web in each lake and related to available physical and chemical characteristics of the lakes. The relative content of MeHg increased with trophic level from 4.3 to 12.2% in periphyton, 41 to 79% in zooplankton, 59 to 72% in insects, and 74 to 100% in juvenile and adult char. The d13C signatures of adult char indicated coupling with benthic invertebrates. Cannibalism among char lengthened the food chain. Biomagnification was confirmed in all 18 lakes, with TMFs ranging from 3.5 ± 1.1 to 64.3 ± 0.8. Results indicate that TMFs and food chain length (FCL) are key factors in explaining interlake variability in biomagnification of [Hg] among different lakes.

Formato

application/zip, 2 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.810149

doi:10.1594/PANGAEA.810149

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Gantner, Nikolaus; Power, Michael; Iqaluk, Deborah; Meili, Markus; Borg, Hans; Sundbom, Marcus; Solomon, Keith R; Lawson, Greg; Muir, Derek CG (2010): Mercury concentrations in landlocked Arctic char (Salvelinus alpinus) from the Canadian Arctic. Part I: Insights from trophic relationships in 18 lakes. Environmental Toxicology and Chemistry, 29(3), 621-632, doi:10.1002/etc.95

Palavras-Chave #[SO4]2-; Area; Area/locality; Carbon, organic, dissolved; Carbon, organic, dissolved, standard deviation; Carbon, organic, particulate; Carbon, organic, particulate, standard deviation; Chl a; Chl a std dev; Chloride; Chloride, standard deviation; Chlorophyll a; Chlorophyll a, standard deviation; Cl-; Cl std dev; Continuous Flow Isotope Ratio Mass Spectrometry (CF/IRMS); Coverage; d13C; d15N; delta 13C; delta 15N; Direct Mercury Analyser DMA (Milestone Instruments); DOC; DOC std dev; Event; Hg; Hg std dev; International Polar Year (2007-2008); IPY; Lake; MeHg; Mercury; Mercury, standard deviation; Methylmercury; N; Nitrogen, organic, particulate; Nitrogen, organic, particulate, standard deviation; POC; POC std dev; PON; PON std dev; Prey; prey taxa; Prey taxa; prey taxa, per dry wt; S. alpinus d13C t; S. alpinus d15N t; S. alpinus std dev; Salvelinus alpinus, d13C, tissue; Salvelinus alpinus, d15N, tissue; Salvelinus alpinus, standard deviation; Samp com; Sample amount; Sample comment; Silica, dissolved; Silicon dioxide, standard deviation; SiO2; SiO2 std dev; SO4 std dev; Standard deviation; Std dev; Sulfate; Sulfate, standard deviation; THg; prey taxa, per dry wt; THg; S. alpinus; THg; S. alpinus, per wet wt, for juveniles per dry wt; Time coverage; trophic level; Trophic level
Tipo

Dataset