High Arctic Sea-Ice Algae - The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities
The maximum quantum yield of charge separation in photosystem II (ФPSIImax) was assessed for studying the physiological state of different ice algal communities. By using Rapid Light Curves, relative electron transfer rates (rETR) and photosynthetic parameters were calculated to determine whether ph...
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2442507 2023-05-15T15:06:21+02:00 High Arctic Sea-Ice Algae - The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities Sandbu, Marthe Johnsen, Geir Assmy, Philipp Duarte, Pedro 2017 http://hdl.handle.net/11250/2442507 eng eng NTNU ntnudaim:14186 http://hdl.handle.net/11250/2442507 Marine Coastal Development Marine Biology and Biochemistry Master thesis 2017 ftntnutrondheimi 2019-09-17T06:52:22Z The maximum quantum yield of charge separation in photosystem II (ФPSIImax) was assessed for studying the physiological state of different ice algal communities. By using Rapid Light Curves, relative electron transfer rates (rETR) and photosynthetic parameters were calculated to determine whether photo-acclimation and light saturation (Ek) was evident for the algae sampled during early spring to early summer (March-June). The highest photosynthetic responses, ФPSIImax were found in thin ice and ridge communities in addition to the water column where a Phaeocystis pouchetii bloom took place in early June. The study also indicates that in order to provide reliable estimates for the photosynthetic parameters (αrETR, rETRmax and Ek), the samples need to reach light saturation plateau rETRmax, i.e. be exposed to high enough irradiances, in order to understand the algae sample's ecological and physiological context. Challenges like low biomass of ice algae early in the sampling period provided rETR versus E curves that did not reach rETRmax. Modelling non-linear curves for these led to over-estimation of the saturation light parameter Ek. Master Thesis Arctic ice algae Sea ice NTNU Open Archive (Norwegian University of Science and Technology) Arctic |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
Marine Coastal Development Marine Biology and Biochemistry |
spellingShingle |
Marine Coastal Development Marine Biology and Biochemistry Sandbu, Marthe High Arctic Sea-Ice Algae - The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities |
topic_facet |
Marine Coastal Development Marine Biology and Biochemistry |
description |
The maximum quantum yield of charge separation in photosystem II (ФPSIImax) was assessed for studying the physiological state of different ice algal communities. By using Rapid Light Curves, relative electron transfer rates (rETR) and photosynthetic parameters were calculated to determine whether photo-acclimation and light saturation (Ek) was evident for the algae sampled during early spring to early summer (March-June). The highest photosynthetic responses, ФPSIImax were found in thin ice and ridge communities in addition to the water column where a Phaeocystis pouchetii bloom took place in early June. The study also indicates that in order to provide reliable estimates for the photosynthetic parameters (αrETR, rETRmax and Ek), the samples need to reach light saturation plateau rETRmax, i.e. be exposed to high enough irradiances, in order to understand the algae sample's ecological and physiological context. Challenges like low biomass of ice algae early in the sampling period provided rETR versus E curves that did not reach rETRmax. Modelling non-linear curves for these led to over-estimation of the saturation light parameter Ek. |
author2 |
Johnsen, Geir Assmy, Philipp Duarte, Pedro |
format |
Master Thesis |
author |
Sandbu, Marthe |
author_facet |
Sandbu, Marthe |
author_sort |
Sandbu, Marthe |
title |
High Arctic Sea-Ice Algae - The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities |
title_short |
High Arctic Sea-Ice Algae - The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities |
title_full |
High Arctic Sea-Ice Algae - The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities |
title_fullStr |
High Arctic Sea-Ice Algae - The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities |
title_full_unstemmed |
High Arctic Sea-Ice Algae - The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities |
title_sort |
high arctic sea-ice algae - the use of rapid light curves to assess photosynthetic performance of different ice-algal communities |
publisher |
NTNU |
publishDate |
2017 |
url |
http://hdl.handle.net/11250/2442507 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic ice algae Sea ice |
genre_facet |
Arctic ice algae Sea ice |
op_relation |
ntnudaim:14186 http://hdl.handle.net/11250/2442507 |
_version_ |
1766337978848772096 |