Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland):importance for ecosystem primary production
Patches of benthic diatoms covered 23 to 73% of the sediment area at water depths down to 30 m of a high Arctic fjord system (Young Sound, NE Greenland). Mapping of the in situ chlorophyll (chl a) fluorescence by a pulse amplitude modulated (PAM) fluorometer demonstrated the presence of diatom-cover...
Published in: | Marine Ecology Progress Series |
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Language: | English |
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2002
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Online Access: | https://pure.uhi.ac.uk/en/publications/51a81ae3-9b41-45a8-8660-0ba092c73122 https://doi.org/10.3354/meps238015 |
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ftuhipublicatio:oai:pure.atira.dk:publications/51a81ae3-9b41-45a8-8660-0ba092c73122 2024-06-23T07:48:29+00:00 Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland):importance for ecosystem primary production Glud, Ronnie Kuhl, M Wenzhofer, Frank Rysgaard, S 2002 https://pure.uhi.ac.uk/en/publications/51a81ae3-9b41-45a8-8660-0ba092c73122 https://doi.org/10.3354/meps238015 eng eng https://pure.uhi.ac.uk/en/publications/51a81ae3-9b41-45a8-8660-0ba092c73122 info:eu-repo/semantics/restrictedAccess Glud , R , Kuhl , M , Wenzhofer , F & Rysgaard , S 2002 , ' Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland) : importance for ecosystem primary production ' , MAR ECOL-PROG SER , no. 8 , pp. 15-29 . https://doi.org/10.3354/meps238015 CHLOROPHYLL-A Marine & Freshwater Biology FLUORESCENCE MEASUREMENTS Oceanography SEASONAL-VARIATION Ecology OXYGEN MICROSENSORS PHOTOSYNTHESIS-COUPLED RESPIRATION INTERTIDAL MICROPHYTOBENTHOS NORTHEAST GREENLAND MICROBIAL MAT SPATIAL-RESOLUTION SEDIMENTS SVALBARD article 2002 ftuhipublicatio https://doi.org/10.3354/meps238015 2024-05-27T23:51:24Z Patches of benthic diatoms covered 23 to 73% of the sediment area at water depths down to 30 m of a high Arctic fjord system (Young Sound, NE Greenland). Mapping of the in situ chlorophyll (chl a) fluorescence by a pulse amplitude modulated (PAM) fluorometer demonstrated the presence of diatom-covered sediment patches with a characteristic size scale of 5 to 8 m. The benthic diatoms were well adapted to the ambient irradiance as demonstrated by in situ measurements of the relative electron transport rate (ETR) versus irradiance. However, the characteristics of the PE (photosynthesis versus downwelling irradiance) relations changed within minutes after exposure to changed light conditions neutralizing any depth related light acclimation. This demonstrated that the diatoms efficiently optimized their photosynthetic apparatus to the current light conditions. Steady state O-2 microprofiles measured in situ and in the laboratory showed a gradual increase in the O-2 penetration depth and O-2 concentration at the sediment surface with increasing irradiance. Net photosynthesis showed a compensation irradiance of 4.5 mumol photons m(-2) s(-1) and a net photosynthetic capacity (P-max) of 85 O-2 mmol m(-2) d(-1). No photoinhibition was observed at the maximum irradiance of 140 mumol photons m(-2) s(-1). Total exchange rates Of 02 and DIC mirrored each other and confirmed the depth distribution of benthic diatoms and the microsensors measurements. The compensation irradiance for the integrated benthic community (including macrofauna) decreased with water depth to a minimum of 12 mumol photons m(-2) s(-1) at 30 m water depth. The mean O-2/DIC exchange ratio across the benthic interface was approximately 1.2 and was independent of water depth. Extrapolation of our productivity data to the outer fjord system by accounting for the in situ light regime showed that the primary production of the benthic diatoms was equivalent to that of benthic macroalgae. Benthic net photosynthesis was almost 7 times higher than the gross ... Article in Journal/Newspaper Arctic Arctic Greenland Svalbard University of the Highlands and Islands: Research Database of UHI Arctic Greenland Svalbard Marine Ecology Progress Series 238 15 29 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
CHLOROPHYLL-A Marine & Freshwater Biology FLUORESCENCE MEASUREMENTS Oceanography SEASONAL-VARIATION Ecology OXYGEN MICROSENSORS PHOTOSYNTHESIS-COUPLED RESPIRATION INTERTIDAL MICROPHYTOBENTHOS NORTHEAST GREENLAND MICROBIAL MAT SPATIAL-RESOLUTION SEDIMENTS SVALBARD |
spellingShingle |
CHLOROPHYLL-A Marine & Freshwater Biology FLUORESCENCE MEASUREMENTS Oceanography SEASONAL-VARIATION Ecology OXYGEN MICROSENSORS PHOTOSYNTHESIS-COUPLED RESPIRATION INTERTIDAL MICROPHYTOBENTHOS NORTHEAST GREENLAND MICROBIAL MAT SPATIAL-RESOLUTION SEDIMENTS SVALBARD Glud, Ronnie Kuhl, M Wenzhofer, Frank Rysgaard, S Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland):importance for ecosystem primary production |
topic_facet |
CHLOROPHYLL-A Marine & Freshwater Biology FLUORESCENCE MEASUREMENTS Oceanography SEASONAL-VARIATION Ecology OXYGEN MICROSENSORS PHOTOSYNTHESIS-COUPLED RESPIRATION INTERTIDAL MICROPHYTOBENTHOS NORTHEAST GREENLAND MICROBIAL MAT SPATIAL-RESOLUTION SEDIMENTS SVALBARD |
description |
Patches of benthic diatoms covered 23 to 73% of the sediment area at water depths down to 30 m of a high Arctic fjord system (Young Sound, NE Greenland). Mapping of the in situ chlorophyll (chl a) fluorescence by a pulse amplitude modulated (PAM) fluorometer demonstrated the presence of diatom-covered sediment patches with a characteristic size scale of 5 to 8 m. The benthic diatoms were well adapted to the ambient irradiance as demonstrated by in situ measurements of the relative electron transport rate (ETR) versus irradiance. However, the characteristics of the PE (photosynthesis versus downwelling irradiance) relations changed within minutes after exposure to changed light conditions neutralizing any depth related light acclimation. This demonstrated that the diatoms efficiently optimized their photosynthetic apparatus to the current light conditions. Steady state O-2 microprofiles measured in situ and in the laboratory showed a gradual increase in the O-2 penetration depth and O-2 concentration at the sediment surface with increasing irradiance. Net photosynthesis showed a compensation irradiance of 4.5 mumol photons m(-2) s(-1) and a net photosynthetic capacity (P-max) of 85 O-2 mmol m(-2) d(-1). No photoinhibition was observed at the maximum irradiance of 140 mumol photons m(-2) s(-1). Total exchange rates Of 02 and DIC mirrored each other and confirmed the depth distribution of benthic diatoms and the microsensors measurements. The compensation irradiance for the integrated benthic community (including macrofauna) decreased with water depth to a minimum of 12 mumol photons m(-2) s(-1) at 30 m water depth. The mean O-2/DIC exchange ratio across the benthic interface was approximately 1.2 and was independent of water depth. Extrapolation of our productivity data to the outer fjord system by accounting for the in situ light regime showed that the primary production of the benthic diatoms was equivalent to that of benthic macroalgae. Benthic net photosynthesis was almost 7 times higher than the gross ... |
format |
Article in Journal/Newspaper |
author |
Glud, Ronnie Kuhl, M Wenzhofer, Frank Rysgaard, S |
author_facet |
Glud, Ronnie Kuhl, M Wenzhofer, Frank Rysgaard, S |
author_sort |
Glud, Ronnie |
title |
Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland):importance for ecosystem primary production |
title_short |
Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland):importance for ecosystem primary production |
title_full |
Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland):importance for ecosystem primary production |
title_fullStr |
Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland):importance for ecosystem primary production |
title_full_unstemmed |
Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland):importance for ecosystem primary production |
title_sort |
benthic diatoms of a high arctic fjord (young sound, ne greenland):importance for ecosystem primary production |
publishDate |
2002 |
url |
https://pure.uhi.ac.uk/en/publications/51a81ae3-9b41-45a8-8660-0ba092c73122 https://doi.org/10.3354/meps238015 |
geographic |
Arctic Greenland Svalbard |
geographic_facet |
Arctic Greenland Svalbard |
genre |
Arctic Arctic Greenland Svalbard |
genre_facet |
Arctic Arctic Greenland Svalbard |
op_source |
Glud , R , Kuhl , M , Wenzhofer , F & Rysgaard , S 2002 , ' Benthic diatoms of a high Arctic fjord (Young Sound, NE Greenland) : importance for ecosystem primary production ' , MAR ECOL-PROG SER , no. 8 , pp. 15-29 . https://doi.org/10.3354/meps238015 |
op_relation |
https://pure.uhi.ac.uk/en/publications/51a81ae3-9b41-45a8-8660-0ba092c73122 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3354/meps238015 |
container_title |
Marine Ecology Progress Series |
container_volume |
238 |
container_start_page |
15 |
op_container_end_page |
29 |
_version_ |
1802638888707031040 |