Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland
Stable isotope compositions of organic carbon (δ 13 C org ) and nitrogen (δ 15 N) in macrophytes and sediments are useful in assessing sources of lake productivity and diagenesis of organic matter from formation through sedimentation to decomposition. Despite the increasing importance of high-latitu...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Taylor & Francis
2021
|
Subjects: | |
Online Access: | https://dx.doi.org/10.6084/m9.figshare.6166292.v3 https://tandf.figshare.com/articles/journal_contribution/Spatial_variation_in_stable_isotopic_composition_of_organic_matter_of_macrophytes_and_sediments_from_a_small_Arctic_lake_in_west_Greenland/6166292/3 |
id |
ftdatacite:10.6084/m9.figshare.6166292.v3 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.6084/m9.figshare.6166292.v3 2023-05-15T14:59:47+02:00 Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland Thompson, Hilary A. White, Jeffrey R. Pratt, Lisa M. 2021 https://dx.doi.org/10.6084/m9.figshare.6166292.v3 https://tandf.figshare.com/articles/journal_contribution/Spatial_variation_in_stable_isotopic_composition_of_organic_matter_of_macrophytes_and_sediments_from_a_small_Arctic_lake_in_west_Greenland/6166292/3 unknown Taylor & Francis https://dx.doi.org/10.1080/15230430.2017.1420282 https://dx.doi.org/10.6084/m9.figshare.6166292 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology FOS Biological sciences 69999 Biological Sciences not elsewhere classified Inorganic Chemistry article-journal ScholarlyArticle Journal contribution Text 2021 ftdatacite https://doi.org/10.6084/m9.figshare.6166292.v3 https://doi.org/10.1080/15230430.2017.1420282 https://doi.org/10.6084/m9.figshare.6166292 2022-04-01T12:44:52Z Stable isotope compositions of organic carbon (δ 13 C org ) and nitrogen (δ 15 N) in macrophytes and sediments are useful in assessing sources of lake productivity and diagenesis of organic matter from formation through sedimentation to decomposition. Despite the increasing importance of high-latitude landscapes to carbon cycling under amplified and accelerating warming in the Arctic, the high density of small closed-basin lakes in this landscape, and the utility of stable isotopes in the study of carbon dynamics, limited data are available on within-lake spatial variability of δ 13 C org and δ 15 N in these systems. The goal of this study was to investigate the spatial variability in stable isotopic composition of three dominant macrophyte species ( Hippuris vulgaris, Eriophorum angustifolium, Warnstorfia exannulata ) and sediments from littoral and profundal areas of a single closed-basin system among the common small Arctic lakes that populate the ice-free margin of Greenland. The range in δ 13 C org of macrophytes (−33.9‰ to −27.1‰) was within the typical range of plants utilizing the C 3 pathway for carbon fixation. No notable differences were observed in δ 13 C org between segments of the individual macrophytes (emergent, submergent, and root tissues), indicating that the isotopic fractionation of carbon was similar throughout the plant. Between-species variations in δ 13 C org were small, but significant ( p 13C. The range of δ 15 N in littoral and profundal sediments (−0.52‰ to 1.33‰) was small, with littoral surface sediments 1‰ less enriched in 15 N than surface sediments in the profundal zone. The C/N ratios of macrophytes (mean ± SD: 27.0 ± 12.6), littoral sediments (mean ± SD: 11.0 ± 1.0), and profundal sediments (mean ± SD: 9.1 ± 0.9) point to diagenetic alteration. Combined isotopic and elemental (C/N) compositions of littoral and profundal sediments suggest that organic matter accumulating in the study lake originate primarily from in-lake primary production of macrophytes. Terrestrial sources are likely minor because of the hydrologically closed basin and limited aeolian inputs, suggesting that the majority of organic matter produced by the dominant littoral macrophyte community was decomposed between production and sediment deposition. Text Arctic Eriophorum Greenland DataCite Metadata Store (German National Library of Science and Technology) Arctic Greenland Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology FOS Biological sciences 69999 Biological Sciences not elsewhere classified Inorganic Chemistry |
spellingShingle |
59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology FOS Biological sciences 69999 Biological Sciences not elsewhere classified Inorganic Chemistry Thompson, Hilary A. White, Jeffrey R. Pratt, Lisa M. Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland |
topic_facet |
59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology FOS Biological sciences 69999 Biological Sciences not elsewhere classified Inorganic Chemistry |
description |
Stable isotope compositions of organic carbon (δ 13 C org ) and nitrogen (δ 15 N) in macrophytes and sediments are useful in assessing sources of lake productivity and diagenesis of organic matter from formation through sedimentation to decomposition. Despite the increasing importance of high-latitude landscapes to carbon cycling under amplified and accelerating warming in the Arctic, the high density of small closed-basin lakes in this landscape, and the utility of stable isotopes in the study of carbon dynamics, limited data are available on within-lake spatial variability of δ 13 C org and δ 15 N in these systems. The goal of this study was to investigate the spatial variability in stable isotopic composition of three dominant macrophyte species ( Hippuris vulgaris, Eriophorum angustifolium, Warnstorfia exannulata ) and sediments from littoral and profundal areas of a single closed-basin system among the common small Arctic lakes that populate the ice-free margin of Greenland. The range in δ 13 C org of macrophytes (−33.9‰ to −27.1‰) was within the typical range of plants utilizing the C 3 pathway for carbon fixation. No notable differences were observed in δ 13 C org between segments of the individual macrophytes (emergent, submergent, and root tissues), indicating that the isotopic fractionation of carbon was similar throughout the plant. Between-species variations in δ 13 C org were small, but significant ( p 13C. The range of δ 15 N in littoral and profundal sediments (−0.52‰ to 1.33‰) was small, with littoral surface sediments 1‰ less enriched in 15 N than surface sediments in the profundal zone. The C/N ratios of macrophytes (mean ± SD: 27.0 ± 12.6), littoral sediments (mean ± SD: 11.0 ± 1.0), and profundal sediments (mean ± SD: 9.1 ± 0.9) point to diagenetic alteration. Combined isotopic and elemental (C/N) compositions of littoral and profundal sediments suggest that organic matter accumulating in the study lake originate primarily from in-lake primary production of macrophytes. Terrestrial sources are likely minor because of the hydrologically closed basin and limited aeolian inputs, suggesting that the majority of organic matter produced by the dominant littoral macrophyte community was decomposed between production and sediment deposition. |
format |
Text |
author |
Thompson, Hilary A. White, Jeffrey R. Pratt, Lisa M. |
author_facet |
Thompson, Hilary A. White, Jeffrey R. Pratt, Lisa M. |
author_sort |
Thompson, Hilary A. |
title |
Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland |
title_short |
Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland |
title_full |
Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland |
title_fullStr |
Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland |
title_full_unstemmed |
Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland |
title_sort |
spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small arctic lake in west greenland |
publisher |
Taylor & Francis |
publishDate |
2021 |
url |
https://dx.doi.org/10.6084/m9.figshare.6166292.v3 https://tandf.figshare.com/articles/journal_contribution/Spatial_variation_in_stable_isotopic_composition_of_organic_matter_of_macrophytes_and_sediments_from_a_small_Arctic_lake_in_west_Greenland/6166292/3 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Greenland Arctic Lake |
geographic_facet |
Arctic Greenland Arctic Lake |
genre |
Arctic Eriophorum Greenland |
genre_facet |
Arctic Eriophorum Greenland |
op_relation |
https://dx.doi.org/10.1080/15230430.2017.1420282 https://dx.doi.org/10.6084/m9.figshare.6166292 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.6166292.v3 https://doi.org/10.1080/15230430.2017.1420282 https://doi.org/10.6084/m9.figshare.6166292 |
_version_ |
1766331902952734720 |