In situ photosynthesis and estimated annual production of the red macroalga Myriogramme mangini in relation to underwater irradiance at Signy Island (Antarctica)
For the first time, photosynthesis of Myriogramme mangini (Gain) Skottsberg, one of the dominant red macroalgae in the sublittoral of Signy Island (South Orkney Islands), was studied in situ under natural irradiance levels in specially developed incubation chambers. M. mangini is adapted to low irra...
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Cambridge University Press (CUP)
1996
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Online Access: | http://dx.doi.org/10.1017/s095410209600034x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209600034X |
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crcambridgeupr:10.1017/s095410209600034x 2024-03-03T08:38:21+00:00 In situ photosynthesis and estimated annual production of the red macroalga Myriogramme mangini in relation to underwater irradiance at Signy Island (Antarctica) Brouwer, Patty E.M. 1996 http://dx.doi.org/10.1017/s095410209600034x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209600034X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 8, issue 3, page 245-252 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1996 crcambridgeupr https://doi.org/10.1017/s095410209600034x 2024-02-08T08:39:54Z For the first time, photosynthesis of Myriogramme mangini (Gain) Skottsberg, one of the dominant red macroalgae in the sublittoral of Signy Island (South Orkney Islands), was studied in situ under natural irradiance levels in specially developed incubation chambers. M. mangini is adapted to low irradiance levels. Water transparency varied over the year. A maximum attenuation coefficient (k d ) of 0.328 m −1 was reached in January, and the water was clearest in September with a k d value of 0.079 m −1 . Classification of the water type on a Jerlov scale, gave water type 4 in January and II in May and June. The mean k d value over the year was 0.158 m −1 and the water was classified as Jerlov's water type 1. The euphotic depths (Z eu ) for 1%, 0.1% and 0.01% surface irradiance levels were 29.1 m, 43.7 m and 58.3 m, respectively. Photosynthetic characteristics were determined, with the oxygen production rates and irradiance levels measured in situ , using P-I curves. The initial saturation irradiance (I k ) varied significantly from 18.0 ± 1.5 μmol m −2 s −1 in autumn to 10.5 ± 1.8 μmol m −2 s −1 in early spring. Mean photosynthetic capacity (P g max ) ranged from 57.2 ± 1.3 μmol O 2 g −1 DW h −1 to 63.1 ± 1.6 μmol O 2 g −1 DW h −1 . The photosynthetic efficiency (α) was 3.2 ± 0.2 μmol O 2 g −1 DW h −1 (μmol m −2 s −1 ) −1 in autumn and 6.0 ± 1.0 μmol O 2 g −1 DW h −1 (μmol m −2 s −1 ) −1 in early spring. Compensation irradiance (I c ) was low and ranged from 2.5 to 2.8 μmol m −2 s −1 . Estimates of annual net production rates were 128.1 and 0.6 mmol O 2 g −1 DW y −1 at 5 m depth and 20 m depth, respectively. A maximum depth of occurrence of M. mangini was predicted at 22.9 m (2.7% of the surface irradiance). Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Signy Island South Orkney Islands Cambridge University Press South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Skottsberg ENVELOPE(-60.809,-60.809,-63.921,-63.921) Antarctic Science 8 3 245 252 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Brouwer, Patty E.M. In situ photosynthesis and estimated annual production of the red macroalga Myriogramme mangini in relation to underwater irradiance at Signy Island (Antarctica) |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
For the first time, photosynthesis of Myriogramme mangini (Gain) Skottsberg, one of the dominant red macroalgae in the sublittoral of Signy Island (South Orkney Islands), was studied in situ under natural irradiance levels in specially developed incubation chambers. M. mangini is adapted to low irradiance levels. Water transparency varied over the year. A maximum attenuation coefficient (k d ) of 0.328 m −1 was reached in January, and the water was clearest in September with a k d value of 0.079 m −1 . Classification of the water type on a Jerlov scale, gave water type 4 in January and II in May and June. The mean k d value over the year was 0.158 m −1 and the water was classified as Jerlov's water type 1. The euphotic depths (Z eu ) for 1%, 0.1% and 0.01% surface irradiance levels were 29.1 m, 43.7 m and 58.3 m, respectively. Photosynthetic characteristics were determined, with the oxygen production rates and irradiance levels measured in situ , using P-I curves. The initial saturation irradiance (I k ) varied significantly from 18.0 ± 1.5 μmol m −2 s −1 in autumn to 10.5 ± 1.8 μmol m −2 s −1 in early spring. Mean photosynthetic capacity (P g max ) ranged from 57.2 ± 1.3 μmol O 2 g −1 DW h −1 to 63.1 ± 1.6 μmol O 2 g −1 DW h −1 . The photosynthetic efficiency (α) was 3.2 ± 0.2 μmol O 2 g −1 DW h −1 (μmol m −2 s −1 ) −1 in autumn and 6.0 ± 1.0 μmol O 2 g −1 DW h −1 (μmol m −2 s −1 ) −1 in early spring. Compensation irradiance (I c ) was low and ranged from 2.5 to 2.8 μmol m −2 s −1 . Estimates of annual net production rates were 128.1 and 0.6 mmol O 2 g −1 DW y −1 at 5 m depth and 20 m depth, respectively. A maximum depth of occurrence of M. mangini was predicted at 22.9 m (2.7% of the surface irradiance). |
format |
Article in Journal/Newspaper |
author |
Brouwer, Patty E.M. |
author_facet |
Brouwer, Patty E.M. |
author_sort |
Brouwer, Patty E.M. |
title |
In situ photosynthesis and estimated annual production of the red macroalga Myriogramme mangini in relation to underwater irradiance at Signy Island (Antarctica) |
title_short |
In situ photosynthesis and estimated annual production of the red macroalga Myriogramme mangini in relation to underwater irradiance at Signy Island (Antarctica) |
title_full |
In situ photosynthesis and estimated annual production of the red macroalga Myriogramme mangini in relation to underwater irradiance at Signy Island (Antarctica) |
title_fullStr |
In situ photosynthesis and estimated annual production of the red macroalga Myriogramme mangini in relation to underwater irradiance at Signy Island (Antarctica) |
title_full_unstemmed |
In situ photosynthesis and estimated annual production of the red macroalga Myriogramme mangini in relation to underwater irradiance at Signy Island (Antarctica) |
title_sort |
in situ photosynthesis and estimated annual production of the red macroalga myriogramme mangini in relation to underwater irradiance at signy island (antarctica) |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1017/s095410209600034x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209600034X |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-45.595,-45.595,-60.708,-60.708) ENVELOPE(-60.809,-60.809,-63.921,-63.921) |
geographic |
South Orkney Islands Signy Island Skottsberg |
geographic_facet |
South Orkney Islands Signy Island Skottsberg |
genre |
Antarc* Antarctic Science Antarctica Signy Island South Orkney Islands |
genre_facet |
Antarc* Antarctic Science Antarctica Signy Island South Orkney Islands |
op_source |
Antarctic Science volume 8, issue 3, page 245-252 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s095410209600034x |
container_title |
Antarctic Science |
container_volume |
8 |
container_issue |
3 |
container_start_page |
245 |
op_container_end_page |
252 |
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1792506729082126336 |