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 (Ω 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: |
Copernicus Publications
2015
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-12-4895-2015 https://doaj.org/article/d5654e02f57243efa77e26a9efd323ae |
id |
ftdoajarticles:oai:doaj.org/article:d5654e02f57243efa77e26a9efd323ae |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:d5654e02f57243efa77e26a9efd323ae 2023-05-15T14:58:04+02:00 Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord D. Krause-Jensen C. M. Duarte I. E. Hendriks L. Meire M. E. Blicher N. Marbà M. K. Sejr 2015-08-01T00:00:00Z https://doi.org/10.5194/bg-12-4895-2015 https://doaj.org/article/d5654e02f57243efa77e26a9efd323ae EN eng Copernicus Publications http://www.biogeosciences.net/12/4895/2015/bg-12-4895-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-4895-2015 https://doaj.org/article/d5654e02f57243efa77e26a9efd323ae Biogeosciences, Vol 12, Iss 16, Pp 4895-4911 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-4895-2015 2022-12-31T06:29:18Z The Arctic Ocean is considered the most vulnerable ecosystem to ocean acidification, and large-scale assessments of pH and the saturation state for aragonite (Ω 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 Ω 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 Ω 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 Ω arag . Results show variability in pH and Ω 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 ... Article in Journal/Newspaper Arctic Arctic Ocean Greenland Ocean acidification Subarctic Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Greenland Biogeosciences 12 16 4895 4911 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 D. Krause-Jensen C. M. Duarte I. E. Hendriks L. Meire M. E. Blicher N. Marbà M. K. Sejr Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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 (Ω 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 Ω 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 Ω 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 Ω arag . Results show variability in pH and Ω 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 ... |
format |
Article in Journal/Newspaper |
author |
D. Krause-Jensen C. M. Duarte I. E. Hendriks L. Meire M. E. Blicher N. Marbà M. K. Sejr |
author_facet |
D. Krause-Jensen C. M. Duarte I. E. Hendriks L. Meire M. E. Blicher N. Marbà M. K. Sejr |
author_sort |
D. Krause-Jensen |
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 |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-4895-2015 https://doaj.org/article/d5654e02f57243efa77e26a9efd323ae |
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 |
Biogeosciences, Vol 12, Iss 16, Pp 4895-4911 (2015) |
op_relation |
http://www.biogeosciences.net/12/4895/2015/bg-12-4895-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-4895-2015 https://doaj.org/article/d5654e02f57243efa77e26a9efd323ae |
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_ |
1766330156447694848 |