Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae

Seco, José; Xavier, José C.; Bustamante, Paco; Coelho, J.P.; Saunders, Ryan A.; Ferreira, Nicole; Fielding, Sophie; Pardal, Miguel Ângelo; Stowasser, Gabriele; Viana, Thainara; Tarling, Geraint A.; Pereira, Eduarda; Brierley, Andrew S.

doi:10.1016/j.envpol.2020.114711

Cited by 17 publications

(12 citation statements)

References 79 publications

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“…Moreover, at Gough Island, Atlantic petrels (Pterodroma incerta), soft-plumaged petrels (Pterodroma mollis) and sooty albatrosses (Phoebetria fusca) all had higher feather THg concentrations in 2009/2010 compared with the mid-1980s [13]. Similar trends are not observed in lower trophic level organisms (cephalopod and myctophid species) at South Georgia [54,55]; however, these samples were collected far to the south of the subantarctic and subtropical waters used by the majority of grey-headed albatrosses.…”

Section: Discussionmentioning

confidence: 59%

Mercury exposure in an endangered seabird: long-term changes and relationships with trophic ecology and breeding success

et al. 2020

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Mercury (Hg) is an environmental contaminant which, at high concentrations, can negatively influence avian physiology and demography. Albatrosses (Diomedeidae) have higher Hg burdens than all other avian families. Here, we measure total Hg (THg) concentrations of body feathers from adult grey-headed albatrosses ( Thalassarche chrysostoma ) at South Georgia. Specifically, we (i) analyse temporal trends at South Georgia (1989–2013) and make comparisons with other breeding populations; (ii) identify factors driving variation in THg concentrations and (iii) examine relationships with breeding success. Mean ± s.d. feather THg concentrations were 13.0 ± 8.0 µg g −1 dw, which represents a threefold increase over the past 25 years at South Georgia and is the highest recorded in the Thalassarche genus. Foraging habitat, inferred from stable isotope ratios of carbon ( δ 13 C), significantly influenced THg concentrations—feathers moulted in Antarctic waters had far lower THg concentrations than those moulted in subantarctic or subtropical waters. THg concentrations also increased with trophic level ( δ 15 N), reflecting the biomagnification process. There was limited support for the influence of sex, age and previous breeding outcome on feather THg concentrations. However, in males, Hg exposure was correlated with breeding outcome—failed birds had significantly higher feather THg concentrations than successful birds. These results provide key insights into the drivers and consequences of Hg exposure in this globally important albatross population.

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Section: Discussionmentioning

confidence: 59%

Mercury exposure in an endangered seabird: long-term changes and relationships with trophic ecology and breeding success

et al. 2020

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“…This is not surprising since the zooplankton species examined range from predominantly herbivorous Antarctic krill (Quetin and Ross, 1991) to predators such as Themisto gaudichaudii (Havermans et al, 2019). Squid and myctophid fish link zooplankton to the top predators (seabirds) and, in terms of Hg dynamics, exhibit some degree of variation between individuals and species in Hg concentrations [for more details see (Seco et al, 2020a;2020b)]. Generally, the highest Hg concentrations were found in predators higher in the food web (notothenioid fish and seabirds).…”

Section: Trophic Structure In Relation To Mercury Concentrationsmentioning

confidence: 99%

Mercury biomagnification in a Southern Ocean food web

Seco

Aparício²,

Brierley³

et al. 2021

Environmental Pollution

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“…In the blood stream, Hg and Cd are bound to complex protein forms and are then transported first to the liver. In the liver, heavy metals are divided into two parts, some of which will accumulate in the liver, while others will be transferred to bile and converted into inorganic Hg and Cd compounds and then re-detoxified (Evans et al, 1993;Seco et al, 2020). The compound will then be delivered through the blood to the kidney, some of which will accumulate in the kidney, and somewill be removed with urine (Ghedira et al, 2010;Squadrone et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Effects of Temperature and Different Feed Uptake on Mercury (Hg) and Cadmium (Cd) Accumulation in Nile Tilapia

Sunardi¹,

Fadilah²,

Fittri³

et al. 2022

EEC

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Climate warming due to increases in atmospherictemperature and heavy metal contamination constitutesa major issue for the aquatic ecosystem. Heavy metal toxicity hinges on an organismâs tolerable limit ofexposure to these elements, and in the aquatic environment, higher temperatures enhances this toxicity infish. The purpose of this study was to investigate the combined effects of higher temperature and differentfeed uptake on Hg and Cd accumulation in Nile tilapia (Oreochromis niloticus). Fish were exposed to asingle concentration of 10 Î¼g/l mercury (Hg) or 100 Î¼g/l cadmium (Cd) for 30 days under 24 Â°C (roomtemperature) and 32 Â°C (elevated temperature) conditions in a 7-L aquaria. The feed used in this experimentcomprised pellets, water and pellets, and water and silkworms, in combination with temperature andheavy metal exposure. Results demonstrated Hg and Cd accumulation in flesh, kidney and liver increasedwith increasing temperature. The influence of different uptake mediahas an effect onHg and Cdconcentration levels in fish organs. The order of Hg and Cd accumulation in organs, from the highest levelto the lowest, was kidney, liver and flesh.

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Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae

Abstract: Capsule: Myctophids are a key group in the Southern Ocean food web, and have shown a possible decreasing trend in mercury contamination over the decade.

Cited by 17 publications

References 79 publications

Mercury exposure in an endangered seabird: long-term changes and relationships with trophic ecology and breeding success

Mercury exposure in an endangered seabird: long-term changes and relationships with trophic ecology and breeding success

Mercury biomagnification in a Southern Ocean food web

Effects of Temperature and Different Feed Uptake on Mercury (Hg) and Cadmium (Cd) Accumulation in Nile Tilapia

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