Keystone seabird may face thermoregulatory challenges in a warming Arctic

Scientific Reports, Год журнала: 2023, Номер 13(1)

Опубликована: Окт. 4, 2023

Abstract Climate change affects the Arctic more than any other region, resulting in evolving weather, vanishing sea ice and altered biochemical cycling, which may increase biotic exposure to chemical pollution. We tested thermoregulatory impacts of these changes on most abundant seabird, little auk ( Alle alle ). This small diving species uses ice-habitats for foraging zooplankton resting. equipped eight auks with 3D accelerometers monitor behavior, ingested temperature recorders measure body (T b also recorded weather conditions, collected blood assess mercury (Hg) contamination. There were nonlinear relationships between time engaged different behaviors T . increased ice, following declines while polar waters, but changed when birds resting water. flying, decreased at colony after being elevated during flight. Weather not Hg contamination, affected However, given our sample size, further research regarding effects is warranted. Results suggest that varies behavior loss due global warming cause energic challenges trips sea.

Язык: Английский

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A keystone avian predator faces elevated energy expenditure in a warming Arctic

Ecology, Год журнала: 2023, Номер 104(5)

Опубликована: Март 20, 2023

Abstract Climate change is transforming bioenergetic landscapes, challenging behavioral and physiological coping mechanisms. A critical question involves whether animals can adjust patterns energy expenditure to stabilize fitness given reconfiguration of resource bases, or limits plasticity ultimately compromise balance. In the Arctic, rapidly warming temperatures are food webs, making Arctic organisms strong models for understanding biological implications climate change‐related environmental variability. We examined in daily (DEE) an seabird, little auk ( Alle alle ) response variability change‐sensitive drivers availability, sea surface temperature (SST) ice coverage (SIC), tested hypothesis that energetic ceilings exposure mercury, important neurotoxin endocrine disrupter marine ecosystems, may limit scope plasticity. To estimate DEE, we used accelerometer data obtained across years from two colonies exposed distinct conditions (Ukaleqarteq [UK], East Greenland; Hornsund [HS], Svalbard). proceeded model future changes SST predict impacts. At UK, high flight costs linked low SIC drove DEE below above 4 × basal metabolic rate (BMR), a proposed threshold breeding birds. However, remained 7 BMR, alternative threshold, did not plateau. Birds at HS experienced higher, relatively invariable SST, operated BMR. Mercury was unrelated stable. Thus, currently buffers fitness, providing resiliency against change. Nevertheless, modeling suggests continued promote accelerating increases which become unsustainable.

Язык: Английский

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Concentrations and Yields of Mercury, Methylmercury, and Dissolved Organic Carbon From Contrasting Catchments in the Discontinuous Permafrost Region, Western Canada

Water Resources Research, Год журнала: 2023, Номер 59(11)

Опубликована: Окт. 30, 2023

Abstract Climate change and permafrost thaw may impact the mobilization of terrestrial dissolved organic carbon (DOC), mercury (Hg), neurotoxic methylmercury (MeHg) into aquatic ecosystems; thus, understanding processes that control analyte export in northern catchments is needed. We monitored water chemistry for 3 years (2019–2021) at a peatland catchment (Scotty Creek) mixed (Smith Dehcho (Northwest Territories), within discontinuous zone boreal western Canada. The had higher DOC MeHg, but lower total Hg concentrations (mean ± standard deviation; 19 2.6 mg L −1 ; 0.08 0.04 ng DMeHg 1.1 0.3 THg ) than (12 4.4 0.05 0.01 3.1 2.2 ). Analyte increased with discharge catchment, suggesting transport limitation flushing near‐surface, organic‐rich flow paths during wet periods. In contrast, were not primarily associated discharge. MeHg concentrations, MeHg:THg, MeHg:DOC temperature, enhanced methylation warmer Mean open season yields greater more variable from (1.1–6.6 vs. 1.4–2.4 g m −2 5.2–36 6.1–10 Crucial storage thresholds controlling runoff generation likely drove inter‐annual variability catchment. Our results suggest climate influence production boreal‐Arctic as temperatures increase, peatlands thaw, altered.

Язык: Английский

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Low-Cost Signal Enhanced Colorimetric and Sers Dual-Mode Paper Sensor for Rapid and Ultrasensitive Screening of Mercury Ions in Tea

Опубликована: Янв. 1, 2024

Язык: Английский

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Sources and melt flux of methylmercury in sea ice on the Chukchi Plateau, Arctic Ocean

Estuarine Coastal and Shelf Science, Год журнала: 2023, Номер 294, С. 108536 - 108536

Опубликована: Окт. 20, 2023

Язык: Английский

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Sources and pathways of mercury in soils from Antarctic periglacial areas

CATENA, Год журнала: 2023, Номер 234, С. 107592 - 107592

Опубликована: Окт. 19, 2023

Язык: Английский

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Dimethylmercury

Elsevier eBooks, Год журнала: 2023, Номер unknown, С. 785 - 792

Опубликована: Июль 2, 2023

Язык: Английский

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Methylmercury dietary pathways and bioaccumulation in Arctic benthic invertebrates of the Beaufort Sea

Arctic Science, Год журнала: 2024, Номер 10(2), С. 305 - 320

Опубликована: Янв. 23, 2024

This study investigated methylmercury (MeHg) concentrations in Arctic benthic invertebrates from two shelf sites the Canadian Beaufort Sea. Carbon, nitrogen, and sulfur stable isotopes fatty acids were measured to examine diet influences on MeHg 476 individuals 53 taxa of representing three different feeding guilds. Taxonomic identifications based DNA-barcoding traditional taxonomy. ranged 3 421 ng/g dry weight increased over trophic levels (δ 15 N range = 4.4–14.2‰). Organic matter sources had small but significant bioaccumulation food web. Carbon isotope ratios 13 C, −25.5 −19.8‰) positively correlated with concentrations, suggesting greater reliance carbon contributed higher concentrations. Sulfur unrelated Fatty suggested diatoms versus dinoflagellates, resources influenced Higher observed at site closer Mackenzie River mouth than Cape Bathurst site. generated most taxonomically rich dataset marine benthos date provides a basis for future research web dynamics

Язык: Английский

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Terrestrial input and biological processes drive varying mineral/organic matrix-related mercury sequestration and deposition in the East Siberian Arctic Shelf

Chemical Geology, Год журнала: 2024, Номер unknown, С. 122409 - 122409

Опубликована: Сен. 1, 2024

Язык: Английский

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The role of prokaryotic mercury methylators and demethylators in Canadian Arctic thermokarst lakes

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Окт. 4, 2024

Permafrost soils are critical reservoirs for mercury (Hg), with the thawing process leading to release of this element into environment, posing significant environmental risks. Of particular concern is methylated form mercury, monomethylmercury (MMHg), known its adverse effects on Human health. Microbial communities play a pivotal role in formation MMHg by facilitating Hg methylation, yet specific types microbes involved still need be understood. Microorganisms also demethylation MMHg, slowing crossing toxic threshold concentration environment. This study aimed identify microbial drivers behind changes speciation (MMHg and Hg) permafrost thaw lakes assess significance biotic component biogeochemistry. Sediment samples were collected from two thermokarst Canadian sub-arctic throughout Winter Summer 2022. Gene-centric metagenomic applied whole genome sequencing (WGS) was conducted genes methylation (hgcA hgcB) (merA merB), hgcA hgcB confirmed qPCR. The showed cycle shifted coherently total measurements. Particularly, diversity group prokaryotes decreased winter summer. HgcA, merA, merB coverage low summer, while they drastically increased during winter, similarly all soil depth layers investigated, consistently levels measured. Notably, values five times higher than measured Our provides new insights contribution Arctic degrading permafrost.

Язык: Английский

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