Shifts in elemental composition, methylmercury content and δ 15 N ratio during growth of a High Arctic copepod
Summary 1. We examined how ontogenetic development in a calanoid copepod from the High Arctic, Limnocalanus macrurus , influenced its elemental composition (carbon, nitrogen, phosphorus), methylmercury (MeHg) content and stable nitrogen and carbon isotope ratios in populations from nine lakes. 2. Po...
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crwiley:10.1111/j.1365-2427.2012.02793.x 2024-06-02T08:00:08+00:00 Shifts in elemental composition, methylmercury content and δ 15 N ratio during growth of a High Arctic copepod CHÉTELAT, JOHN AMYOT, MARC CLOUTIER, LOUISE 2012 http://dx.doi.org/10.1111/j.1365-2427.2012.02793.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2427.2012.02793.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2427.2012.02793.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Freshwater Biology volume 57, issue 6, page 1228-1240 ISSN 0046-5070 1365-2427 journal-article 2012 crwiley https://doi.org/10.1111/j.1365-2427.2012.02793.x 2024-05-03T10:46:41Z Summary 1. We examined how ontogenetic development in a calanoid copepod from the High Arctic, Limnocalanus macrurus , influenced its elemental composition (carbon, nitrogen, phosphorus), methylmercury (MeHg) content and stable nitrogen and carbon isotope ratios in populations from nine lakes. 2. Population structure explained 33–83% of among‐lake variation in the C, N and P composition of the biomass. Biomass dominated by early‐stage copepodites had a greater P content, which declined in more mature populations, as indicated by significant changes in % P and the molar N/P ratio. Carbon and lipid contents increased with the proportion of adult biomass. Copepod populations sampled in warmer waters had a greater proportion of adult biomass, and water temperature was the most significant environmental variable explaining elemental composition. 3. A δ 15 N enrichment of 3.3 ± 1.0‰ was associated with copepodite development. Gut contents of L. macrurus showed no evidence of animal (invertebrate) prey, indicating no change in trophic position. 4. Unexpectedly, MeHg concentration was negatively correlated with the proportion of adult biomass. However, this trend was not significant after correcting MeHg concentration to non‐lipid dry mass, suggesting a lipid dilution effect in more mature copepods. Lake surface area, rather than ontogeny, best explained MeHg concentrations in L. macrurus . 5. Ontogenetic influences on chemical constituents of this common Arctic copepod, particularly δ 15 N ratios and uncorrected MeHg concentrations, highlight the relevance of developmental processes for studies of food webs and mercury in species‐poor High Arctic lakes. Article in Journal/Newspaper Arctic copepod Arctic Copepods Wiley Online Library Arctic Freshwater Biology 57 6 1228 1240 |
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Wiley Online Library |
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crwiley |
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English |
description |
Summary 1. We examined how ontogenetic development in a calanoid copepod from the High Arctic, Limnocalanus macrurus , influenced its elemental composition (carbon, nitrogen, phosphorus), methylmercury (MeHg) content and stable nitrogen and carbon isotope ratios in populations from nine lakes. 2. Population structure explained 33–83% of among‐lake variation in the C, N and P composition of the biomass. Biomass dominated by early‐stage copepodites had a greater P content, which declined in more mature populations, as indicated by significant changes in % P and the molar N/P ratio. Carbon and lipid contents increased with the proportion of adult biomass. Copepod populations sampled in warmer waters had a greater proportion of adult biomass, and water temperature was the most significant environmental variable explaining elemental composition. 3. A δ 15 N enrichment of 3.3 ± 1.0‰ was associated with copepodite development. Gut contents of L. macrurus showed no evidence of animal (invertebrate) prey, indicating no change in trophic position. 4. Unexpectedly, MeHg concentration was negatively correlated with the proportion of adult biomass. However, this trend was not significant after correcting MeHg concentration to non‐lipid dry mass, suggesting a lipid dilution effect in more mature copepods. Lake surface area, rather than ontogeny, best explained MeHg concentrations in L. macrurus . 5. Ontogenetic influences on chemical constituents of this common Arctic copepod, particularly δ 15 N ratios and uncorrected MeHg concentrations, highlight the relevance of developmental processes for studies of food webs and mercury in species‐poor High Arctic lakes. |
format |
Article in Journal/Newspaper |
author |
CHÉTELAT, JOHN AMYOT, MARC CLOUTIER, LOUISE |
spellingShingle |
CHÉTELAT, JOHN AMYOT, MARC CLOUTIER, LOUISE Shifts in elemental composition, methylmercury content and δ 15 N ratio during growth of a High Arctic copepod |
author_facet |
CHÉTELAT, JOHN AMYOT, MARC CLOUTIER, LOUISE |
author_sort |
CHÉTELAT, JOHN |
title |
Shifts in elemental composition, methylmercury content and δ 15 N ratio during growth of a High Arctic copepod |
title_short |
Shifts in elemental composition, methylmercury content and δ 15 N ratio during growth of a High Arctic copepod |
title_full |
Shifts in elemental composition, methylmercury content and δ 15 N ratio during growth of a High Arctic copepod |
title_fullStr |
Shifts in elemental composition, methylmercury content and δ 15 N ratio during growth of a High Arctic copepod |
title_full_unstemmed |
Shifts in elemental composition, methylmercury content and δ 15 N ratio during growth of a High Arctic copepod |
title_sort |
shifts in elemental composition, methylmercury content and δ 15 n ratio during growth of a high arctic copepod |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/j.1365-2427.2012.02793.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2427.2012.02793.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2427.2012.02793.x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic copepod Arctic Copepods |
genre_facet |
Arctic copepod Arctic Copepods |
op_source |
Freshwater Biology volume 57, issue 6, page 1228-1240 ISSN 0046-5070 1365-2427 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2427.2012.02793.x |
container_title |
Freshwater Biology |
container_volume |
57 |
container_issue |
6 |
container_start_page |
1228 |
op_container_end_page |
1240 |
_version_ |
1800744144190046208 |