Does Mercury Biomagnification in a Boreal Lake Food Web Vary Year-Round? – A Comparison Using Bulk Δ15n and Compound-Specific Δ15n of Amino Acids DOI

Alexander John Piro,

Sami J. Taipale, Emmi S. Eerola

и другие.

Опубликована: Янв. 1, 2024

Seasonality characterizes northern latitude lakes, however, limited knowledge exists regarding seasonal fluctuations in mercury (Hg) biomagnification. This study tested for these year-round the food web of a boreal humic lake (Lake Pääjärvi, southern Finland) and to what extent two methods differed trophic level (TL) determination. A representative sample was collected three open-water seasons one ice-covered season. TL calculated from δ15N measured bulk stable isotopes (SIA) compound-specific isotope analysis amino acids (CSIA-AA). Although biomagnification total Hg (THg) detected all using both methods, significant differences magnification slope (TMS) in- between were not detected. TMS highest during winter spring, lowest summer autumn while reverse found [THg] baselines, i.e. regression intercepts. However, baseline estimates significantly different summer, methods. baselines values higher SIA than CSIA-AA Calibrating algae as base generated chain length that longer SIA. These findings highlight need use system- or region-specific calibrations broader comparisons across varying spatial temporal settings.

Язык: Английский

Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework DOI Creative Commons
David C. Evers, Joshua T. Ackerman, Staffan Åkerblom

и другие.

Ecotoxicology, Год журнала: 2024, Номер 33(4-5), С. 325 - 396

Опубликована: Апрель 29, 2024

Abstract An important provision of the Minamata Convention on Mercury is to monitor and evaluate effectiveness adopted measures its implementation. Here, we describe for first time currently available biotic mercury (Hg) data a global scale improve understanding efforts reduce impact Hg pollution people environment. Data from peer-reviewed literature were compiled in Global Biotic Synthesis (GBMS) database (>550,000 points). These provide foundation establishing biomonitoring framework needed track concentrations biota globally. We exposure taxa identified by Convention: fish, sea turtles, birds, marine mammals. Based GBMS database, are presented at relevant geographic scales continents oceanic basins. identify some effective regional templates monitoring methylmercury (MeHg) availability environment, but overall illustrate that there general lack initiatives around world, especially Africa, Australia, Indo-Pacific, Middle East, South Atlantic Pacific Oceans. Temporal trend generally limited. Ecologically sensitive sites (where have above average MeHg tissue concentrations) been throughout world. Efforts model quantify ecosystem sensitivity locally, regionally, globally could help establish efficient programs. present network includes three-step continental approach integrate existing prioritize filling gaps linked with key sources. standardized builds an evidence-based evaluation assess Convention’s progress

Язык: Английский

Процитировано

25
Does mercury biomagnification in a boreal lake food web vary year-round? – A comparison using bulk δ15N and compound-specific δ15N of amino acids DOI Creative Commons
Alexander J. Piro, Sami J. Taipale, Emmi S. Eerola

и другие.

Environmental Pollution, Год журнала: 2025, Номер unknown, С. 125933 - 125933

Опубликована: Фев. 1, 2025

Язык: Английский

Процитировано

0
Preparing for the future offspring: European perch (Perca fluviatilis) biosynthesis of physiologically required fatty acids for the gonads happens already in the autumn DOI Creative Commons
Cyril Rigaud, Kimmo K. Kahilainen, Marco L. Calderini

и другие.

Oecologia, Год журнала: 2023, Номер 203(3-4), С. 477 - 489

Опубликована: Ноя. 17, 2023

Abstract Long-chain polyunsaturated fatty acids (PUFA) are critical for reproduction and thermal adaptation. Year-round variability in the expression of fads2 (fatty acid desaturase 2) liver European perch ( Perca fluviatilis ) a boreal lake was tested relation to individual variation size, sex, maturity, together with stable isotopes values as well (FA) content different tissues prey items. ARA DHA primary production restricted summer months, however, required larger amounts these PUFA during winter, their muscle higher compared summer. The increased winter mature females. Mature females stored gonads already late autumn, long before upcoming spring spawning period May. Lower δ 13 C September suggest that actively synthesized part this reproductive investment. all individuals were synthesizing essential FA help cope over-wintering conditions. Perch seem able modulate its biosynthesis physiologically situations stress (fasting or cold temperatures) high energetic demand (gonadal development). Biosynthesis may be an important survival aquatic food webs periods.

Язык: Английский

Процитировано

7
Year‐round sampling of the fish community in a boreal lake: differences between summer and winter influence estimates of species composition, catch, and fish size DOI Creative Commons
Emmi S. Eerola, Eszter Megyeri, Alexander J. Piro

и другие.

Journal of Fish Biology, Год журнала: 2024, Номер 105(4), С. 1163 - 1177

Опубликована: Июль 19, 2024

Abstract Boreal lakes experience pronounced seasonal variation in abiotic factors, especially light, temperature, and oxygen. A deep boreal humic lake was sampled year‐round to test putative changes total fish catch, species composition, catch‐per‐unit‐effort (CPUE), habitat use, size, condition. Monthly sampling conducted Lake Pääjärvi, southern Finland, during one full year 2020–2021 as well March August 2021 2022. The community dominated by cyprinid all months, but the percentage of percid caught increased warm summer period. Most were littoral habitats highest catches occurred summer, some (e.g., ruffe, Gymnocephalus cernua , pikeperch, Sander lucioperca ) remained abundant winter catch. body size larger while condition factor higher for most species. Fish proportions CPUE, average closest annual mean values September, which may be used optimal period monitor communities similar lakes. Our findings highlight need research reveal impacts rising temperatures diminishing ice‐covered periods food webs.

Язык: Английский

Процитировано

1
Mercury and amino acid content relations in northern pike (Esox lucius) in subarctic lakes along a climate-productivity gradient DOI Creative Commons
Natalia Kozak, Kimmo K. Kahilainen, Hannu Pakkanen

и другие.

Environmental Research, Год журнала: 2023, Номер 233, С. 116511 - 116511

Опубликована: Июнь 25, 2023

Mercury is a highly toxic element for consumers, but its relation to amino acids and physiology of wild fish not well known. The main aim this study was evaluate how total mercury content (THg) northern pike (Esox lucius) related potentially important environmental biological factors along climate-productivity gradient ten subarctic lakes. Linear regression between THg sixteen [nmol mg-1 dry weight] from white dorsal muscle these lakes were tested. Lastly, general linear model (GLM) age-corrected used test which are significantly pike. There positive relationship proline. Seven out analysed (histidine, threonine, arginine, serine, glutamic acid, glycine, aspartic acid) negatively warmer more productive lakes, while showed relationship. GLM indicated higher found in trophic level with lower cysteine inhabiting larger catchment containing substantial proportion peatland area. In general, only the variables also acid content.

Язык: Английский

Процитировано

1
Does Mercury Biomagnification in a Boreal Lake Food Web Vary Year-Round? – A Comparison Using Bulk Δ15n and Compound-Specific Δ15n of Amino Acids DOI

Alexander John Piro,

Sami J. Taipale, Emmi S. Eerola

и другие.

Опубликована: Янв. 1, 2024

Seasonality characterizes northern latitude lakes, however, limited knowledge exists regarding seasonal fluctuations in mercury (Hg) biomagnification. This study tested for these year-round the food web of a boreal humic lake (Lake Pääjärvi, southern Finland) and to what extent two methods differed trophic level (TL) determination. A representative sample was collected three open-water seasons one ice-covered season. TL calculated from δ15N measured bulk stable isotopes (SIA) compound-specific isotope analysis amino acids (CSIA-AA). Although biomagnification total Hg (THg) detected all using both methods, significant differences magnification slope (TMS) in- between were not detected. TMS highest during winter spring, lowest summer autumn while reverse found [THg] baselines, i.e. regression intercepts. However, baseline estimates significantly different summer, methods. baselines values higher SIA than CSIA-AA Calibrating algae as base generated chain length that longer SIA. These findings highlight need use system- or region-specific calibrations broader comparisons across varying spatial temporal settings.

Язык: Английский

Процитировано

0