Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord
The Arctic Ocean is considered the most vulnerable ecosystem to ocean acidification, and large-scale assessments of pH and the saturation state for aragonite (O arag ) have led to the notion that the Arctic Ocean is already close to a corrosive state. In high-latitude coastal waters the regulation o...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2015
|
Subjects: | |
Online Access: | https://www.vliz.be/imisdocs/publications/292777.pdf |
id |
ftvliz:oai:oma.vliz.be:250041 |
---|---|
record_format |
openpolar |
spelling |
ftvliz:oai:oma.vliz.be:250041 2023-05-15T14:55:22+02:00 Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord Krause-Jensen, D. Duarte, C.M. Hendriks, I.E. Meire, L. Blicher, M.E. Marba, N. Sejr, M.K. 2015 application/pdf https://www.vliz.be/imisdocs/publications/292777.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000360294800003 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.5194/bg-12-4895-2015 https://www.vliz.be/imisdocs/publications/292777.pdf info:eu-repo/semantics/openAccess %3Ci%3EBiogeosciences+12%2816%29%3C%2Fi%3E%3A+4895-4911.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.5194%2Fbg-12-4895-2015%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.5194%2Fbg-12-4895-2015%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2015 ftvliz https://doi.org/10.5194/bg-12-4895-2015 2022-05-01T10:30:51Z The Arctic Ocean is considered the most vulnerable ecosystem to ocean acidification, and large-scale assessments of pH and the saturation state for aragonite (O arag ) have led to the notion that the Arctic Ocean is already close to a corrosive state. In high-latitude coastal waters the regulation of pH and O arag is, however, far more complex than offshore because increased biological activity and input of glacial meltwater affect pH. Effects of ocean acidification on calcifiers and non-calcifying phototrophs occupying coastal habitats cannot be derived from extrapolation of current and forecasted offshore conditions, but they require an understanding of the regimes of pH and O arag in their coastal habitats. To increase knowledge of the natural variability in pH in the Arctic coastal zone and specifically to test the influence of benthic vegetated habitats, we quantified pH variability in a Greenland fjord in a nested-scale approach. A sensor array logging pH, O 2 , PAR, temperature and salinity was applied on spatial scales ranging from kilometre scale across the horizontal extension of the fjord; to 100 m scale vertically in the fjord, 10–100 m scale between subtidal habitats with and without kelp forests and between vegetated tidal pools and adjacent vegetated shores; and to centimetre to metre scale within kelp forests and millimetre scale across diffusive boundary layers of macrophyte tissue. In addition, we assessed the temporal variability in pH on diurnal and seasonal scales. Based on pH measurements combined with point samples of total alkalinity, dissolved inorganic carbon and relationships to salinity, we also estimated variability in O arag . Results show variability in pH and O arag of up to 0.2–0.3 units at several scales, i.e. along the horizontal and vertical extension of the fjord, between seasons and on a diel basis in benthic habitats and within 1 m 3 of kelp forest. Vegetated intertidal pools exhibited extreme diel pH variability of > 1.5 units and macrophyte diffusive boundary layers a pH range of up to 0.8 units. Overall, pelagic and benthic metabolism was an important driver of pH and O arag producing mosaics of variability from low levels in the dark to peak levels at high irradiance generally appearing favourable for calcification. We suggest that productive coastal environments may form niches of high pH in a future acidified Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Ocean Greenland Ocean acidification Subarctic Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Arctic Arctic Ocean Greenland Biogeosciences 12 16 4895 4911 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
The Arctic Ocean is considered the most vulnerable ecosystem to ocean acidification, and large-scale assessments of pH and the saturation state for aragonite (O arag ) have led to the notion that the Arctic Ocean is already close to a corrosive state. In high-latitude coastal waters the regulation of pH and O arag is, however, far more complex than offshore because increased biological activity and input of glacial meltwater affect pH. Effects of ocean acidification on calcifiers and non-calcifying phototrophs occupying coastal habitats cannot be derived from extrapolation of current and forecasted offshore conditions, but they require an understanding of the regimes of pH and O arag in their coastal habitats. To increase knowledge of the natural variability in pH in the Arctic coastal zone and specifically to test the influence of benthic vegetated habitats, we quantified pH variability in a Greenland fjord in a nested-scale approach. A sensor array logging pH, O 2 , PAR, temperature and salinity was applied on spatial scales ranging from kilometre scale across the horizontal extension of the fjord; to 100 m scale vertically in the fjord, 10–100 m scale between subtidal habitats with and without kelp forests and between vegetated tidal pools and adjacent vegetated shores; and to centimetre to metre scale within kelp forests and millimetre scale across diffusive boundary layers of macrophyte tissue. In addition, we assessed the temporal variability in pH on diurnal and seasonal scales. Based on pH measurements combined with point samples of total alkalinity, dissolved inorganic carbon and relationships to salinity, we also estimated variability in O arag . Results show variability in pH and O arag of up to 0.2–0.3 units at several scales, i.e. along the horizontal and vertical extension of the fjord, between seasons and on a diel basis in benthic habitats and within 1 m 3 of kelp forest. Vegetated intertidal pools exhibited extreme diel pH variability of > 1.5 units and macrophyte diffusive boundary layers a pH range of up to 0.8 units. Overall, pelagic and benthic metabolism was an important driver of pH and O arag producing mosaics of variability from low levels in the dark to peak levels at high irradiance generally appearing favourable for calcification. We suggest that productive coastal environments may form niches of high pH in a future acidified Arctic Ocean. |
format |
Article in Journal/Newspaper |
author |
Krause-Jensen, D. Duarte, C.M. Hendriks, I.E. Meire, L. Blicher, M.E. Marba, N. Sejr, M.K. |
spellingShingle |
Krause-Jensen, D. Duarte, C.M. Hendriks, I.E. Meire, L. Blicher, M.E. Marba, N. Sejr, M.K. Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
author_facet |
Krause-Jensen, D. Duarte, C.M. Hendriks, I.E. Meire, L. Blicher, M.E. Marba, N. Sejr, M.K. |
author_sort |
Krause-Jensen, D. |
title |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_short |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_full |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_fullStr |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_full_unstemmed |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_sort |
macroalgae contribute to nested mosaics of ph variability in a subarctic fjord |
publishDate |
2015 |
url |
https://www.vliz.be/imisdocs/publications/292777.pdf |
geographic |
Arctic Arctic Ocean Greenland |
geographic_facet |
Arctic Arctic Ocean Greenland |
genre |
Arctic Arctic Ocean Greenland Ocean acidification Subarctic |
genre_facet |
Arctic Arctic Ocean Greenland Ocean acidification Subarctic |
op_source |
%3Ci%3EBiogeosciences+12%2816%29%3C%2Fi%3E%3A+4895-4911.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.5194%2Fbg-12-4895-2015%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.5194%2Fbg-12-4895-2015%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000360294800003 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.5194/bg-12-4895-2015 https://www.vliz.be/imisdocs/publications/292777.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-12-4895-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
16 |
container_start_page |
4895 |
op_container_end_page |
4911 |
_version_ |
1766327165373120512 |