Does mercury biomagnification in a boreal lake food web vary year-round? – A comparison using bulk δ15N and compound-specific δ15N of amino acids

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-02-26 DOI:10.1016/j.envpol.2025.125933

A.J. Piro, S.J. Taipale, E.S. Eerola, E. Megyeri, K.K. Kahilainen

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Abstract

Seasonality characterises northern latitude lakes, however, limited knowledge exists regarding seasonal fluctuations in mercury (Hg) biomagnification. This study tested for these fluctuations year-round in the food web of a boreal humic lake (Lake Pääjärvi, in southern Finland) and for differences between two methods of trophic level (TL) determination. A food web sample was collected in three open-water seasons and one ice-covered season. TL was calculated using bulk nitrogen stable isotopes (δ¹⁵N) and compound-specific stable isotope analysis of δ¹⁵N in amino acids (CSIA-AA). Biomagnification of total Hg (THg), measured through the linear regression of THg (log₁₀[THg]) and TLs, was detected in all seasons using both isotope methods. No significant differences in seasonal trophic magnification slope (TMS), the slope of the linear regression, in- and between methods were found. However, [THg] baseline estimates, the intercept of the linear regression, were significantly different between methods when comparing the same seasons. [THg] baseline values were generally higher in all seasons in bulk δ¹⁵N than CSIA-AA. Results highlight relatively stable biomagnification among seasons in both methods, however, direct comparisons of bulk δ¹⁵N and CSIA-AA TLs require further methodological development.

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.