Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters
Assessments of carbon and nitrogen (N) assimilation in Canadian Arctic waters confirmed the large contribution of subsurface chlorophyll maxima (SCM) to total water-column production from spring to late fall. Although SCM communities showed acclimation to low irradiance and greater nitrate (NO 3 − )...
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ftdoajarticles:oai:doaj.org/article:728eb0f4ee5844be9c86dc7a8c0d08a2 2023-05-15T14:49:36+02:00 Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters J. Martin J. É. Tremblay N. M. Price 2012-12-01T00:00:00Z https://doi.org/10.5194/bg-9-5353-2012 https://doaj.org/article/728eb0f4ee5844be9c86dc7a8c0d08a2 EN eng Copernicus Publications http://www.biogeosciences.net/9/5353/2012/bg-9-5353-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-5353-2012 1726-4170 1726-4189 https://doaj.org/article/728eb0f4ee5844be9c86dc7a8c0d08a2 Biogeosciences, Vol 9, Iss 12, Pp 5353-5371 (2012) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2012 ftdoajarticles https://doi.org/10.5194/bg-9-5353-2012 2022-12-31T04:31:23Z Assessments of carbon and nitrogen (N) assimilation in Canadian Arctic waters confirmed the large contribution of subsurface chlorophyll maxima (SCM) to total water-column production from spring to late fall. Although SCM communities showed acclimation to low irradiance and greater nitrate (NO 3 − ) availability, their productivity was generally constrained by light and temperature. During spring–early summer, most of the primary production at the SCM was sustained by NO 3 − , with an average f -ratio (i.e., relative contribution of NO 3 − uptake to total N uptake) of 0.74 ± 0.26. The seasonal decrease in NO 3 − availability and irradiance, coupled to the build up of ammonium (NH 4 + ), favoured a transition toward a predominantly regenerative system ( f -ratio = 0.37 ± 0.20) during late summer and fall. Results emphasize the need to adequately consider SCM when estimating primary production and to revisit ecosystem model parameters in highly stratified Arctic waters. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Biogeosciences 9 12 5353 5371 |
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 J. Martin J. É. Tremblay N. M. Price Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Assessments of carbon and nitrogen (N) assimilation in Canadian Arctic waters confirmed the large contribution of subsurface chlorophyll maxima (SCM) to total water-column production from spring to late fall. Although SCM communities showed acclimation to low irradiance and greater nitrate (NO 3 − ) availability, their productivity was generally constrained by light and temperature. During spring–early summer, most of the primary production at the SCM was sustained by NO 3 − , with an average f -ratio (i.e., relative contribution of NO 3 − uptake to total N uptake) of 0.74 ± 0.26. The seasonal decrease in NO 3 − availability and irradiance, coupled to the build up of ammonium (NH 4 + ), favoured a transition toward a predominantly regenerative system ( f -ratio = 0.37 ± 0.20) during late summer and fall. Results emphasize the need to adequately consider SCM when estimating primary production and to revisit ecosystem model parameters in highly stratified Arctic waters. |
format |
Article in Journal/Newspaper |
author |
J. Martin J. É. Tremblay N. M. Price |
author_facet |
J. Martin J. É. Tremblay N. M. Price |
author_sort |
J. Martin |
title |
Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters |
title_short |
Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters |
title_full |
Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters |
title_fullStr |
Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters |
title_full_unstemmed |
Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters |
title_sort |
nutritive and photosynthetic ecology of subsurface chlorophyll maxima in canadian arctic waters |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/bg-9-5353-2012 https://doaj.org/article/728eb0f4ee5844be9c86dc7a8c0d08a2 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Biogeosciences, Vol 9, Iss 12, Pp 5353-5371 (2012) |
op_relation |
http://www.biogeosciences.net/9/5353/2012/bg-9-5353-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-5353-2012 1726-4170 1726-4189 https://doaj.org/article/728eb0f4ee5844be9c86dc7a8c0d08a2 |
op_doi |
https://doi.org/10.5194/bg-9-5353-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
12 |
container_start_page |
5353 |
op_container_end_page |
5371 |
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1766320681732014080 |