2016
DOI: 10.12952/journal.elementa.000088
|View full text |Cite
|
Sign up to set email alerts
|

Quantifying mercury isotope dynamics in captive Pacific bluefin tuna (Thunnus orientalis)

Abstract: Analyses of mercury (Hg) isotope ratios in fish tissues are used increasingly to infer sources and biogeochemical processes of Hg in natural aquatic ecosystems. Controlled experiments that can couple internal Hg isotope behavior with traditional isotope tracers (d 13 C, d15 N) can improve the applicability of Hg isotopes as natural ecological tracers. In this study, we investigated changes in Hg isotope ratios (d 202 Hg, D 199 Hg) during bioaccumulation of natural diets in the pelagic Pacific bluefin tuna (… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
4
1

Citation Types

2
47
0

Year Published

2016
2016
2023
2023

Publication Types

Select...
8

Relationship

2
6

Authors

Journals

citations
Cited by 30 publications
(49 citation statements)
references
References 81 publications
(146 reference statements)
2
47
0
Order By: Relevance
“…In cores of sediment and peat, δ 202 Hg is used as a source indicator to investigate historical deposition or changes in Hg source profiles (13, 15). In fish, however, using δ 202 Hg for MeHg in a diagnostic manner is more challenging than simply identifying inorganic Hg sources, because MDF also occurs during photochemical demethylation (5), during microbial methylation and demethylation (59), and potentially during metabolic processing (22, 60). We expect, however, that these variables will not impart considerable changes to the δ 202 Hg of these lake trout due to the consistency in sampling protocol.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…In cores of sediment and peat, δ 202 Hg is used as a source indicator to investigate historical deposition or changes in Hg source profiles (13, 15). In fish, however, using δ 202 Hg for MeHg in a diagnostic manner is more challenging than simply identifying inorganic Hg sources, because MDF also occurs during photochemical demethylation (5), during microbial methylation and demethylation (59), and potentially during metabolic processing (22, 60). We expect, however, that these variables will not impart considerable changes to the δ 202 Hg of these lake trout due to the consistency in sampling protocol.…”
Section: Resultsmentioning
confidence: 99%
“…This biennial sampling therefore captured time-discrete δ 13 C and δ 15 N in lake trout, and results can trace the sensitive dynamic equilibrium sufficiently. Other studies have demonstrated that MeHg in fish has a modestly longer half-life than C and N (60, 62) and that fish can respond rapidly to MeHg source perturbations (6). Based on those observations, along with the rapid, coherent δ 202 Hg shift in lake trout, we believe that the lake trout rapidly respond to cessation in Hg emissions from regional sources.…”
Section: Resultsmentioning
confidence: 99%
“…The difference in the timing of the inflection points for yellowfin tuna (1998) and bigeye tuna (2002) may be an artifact of sampling error (no bigeye tuna sampled in 1998; sample sizes low in 2002) or because of the contrasting biology and ecology of the 2 species. Kwon et al determined the time that so‐called new mercury is at steady state in Pacific bluefin tuna ( Thunnus orientalis ) to be >1070 d. Time to steady state depends on metabolic rate (inverse relationship), which in turn is (directly) related to temperature . At a given temperature, bigeye tuna have lower metabolic rates and likely a longer time to steady state (for mercury), compared with yellowfin tuna.…”
Section: Resultsmentioning
confidence: 99%
“…Slow changes in tuna Hg may be driven by long (>1 year) histories reflected by muscle Hg of large marine predators. Kwon et al 36 reported a biological half-life of Hg in captive Pacific Bluefin tuna (PBFT) of ~500 days. Assuming comparable metabolic rates of ABFT and PBFT and given the larger size of ABFT in this study, Hg levels in ABFT likely represent exposure periods of ≥500 days.…”
Section: Resultsmentioning
confidence: 99%