Modelling the contribution of benthic microbial mats to net primary production in Lake Hoare, McMurdo Dry Valleys
A model was used to simulate primary production of benthic microbial mats in Lake Hoare, southern Victoria Land, Antarctica, and to compare potential benthic to planktonic production. Photosynthetic and respiratory characteristics of mats from five depths in the lake were extrapolated across depth,...
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Language: | English |
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Cambridge University Press (CUP)
2005
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Online Access: | http://dx.doi.org/10.1017/s0954102005002403 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102005002403 |
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crcambridgeupr:10.1017/s0954102005002403 2024-06-23T07:47:12+00:00 Modelling the contribution of benthic microbial mats to net primary production in Lake Hoare, McMurdo Dry Valleys MOORHEAD, DARYL SCHMELING, JAMIE HAWES, IAN 2005 http://dx.doi.org/10.1017/s0954102005002403 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102005002403 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 17, issue 1, page 33-45 ISSN 0954-1020 1365-2079 journal-article 2005 crcambridgeupr https://doi.org/10.1017/s0954102005002403 2024-06-05T04:04:59Z A model was used to simulate primary production of benthic microbial mats in Lake Hoare, southern Victoria Land, Antarctica, and to compare potential benthic to planktonic production. Photosynthetic and respiratory characteristics of mats from five depths in the lake were extrapolated across depth, surface area and time, to estimate whole-lake, annual net primary production. Variation in under-ice light regimes resulting from changes in ice thickness and transparency, and light extinction in the water column was examined, and an uncertainty analysis of key model parameters performed. Daily mat production estimates were 0.98–37.83 mg C m −2 d −1 , depending on depth and PAR, whereas in situ production of phytoplankton averaged 15% of this. Annual patterns of mat production achieved maximum rates of 15–16 g C m −2 y −1 at 10 m depth when ≥ 5% of ambient PAR was transmitted through the ice covering the lake; observed transmittance values were usually ≤ 5%. Increasing underwater PAR had little effect above 5–7% transmittance, as photosynthesis became saturated at this level. Uncertainties in estimates of maximum photosynthetic rate ( P max ), initial slope of photosynthetic-light response (α) and maximum respiration rate ( R max ) explained 72–99% of uncertainty in model behaviour; P max was increasingly important at high light levels whereas α was more important at low light levels, however R max exerted the greatest influence under most conditions. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica McMurdo Dry Valleys Victoria Land Cambridge University Press Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Lake Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) McMurdo Dry Valleys Victoria Land Antarctic Science 17 1 33 45 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
A model was used to simulate primary production of benthic microbial mats in Lake Hoare, southern Victoria Land, Antarctica, and to compare potential benthic to planktonic production. Photosynthetic and respiratory characteristics of mats from five depths in the lake were extrapolated across depth, surface area and time, to estimate whole-lake, annual net primary production. Variation in under-ice light regimes resulting from changes in ice thickness and transparency, and light extinction in the water column was examined, and an uncertainty analysis of key model parameters performed. Daily mat production estimates were 0.98–37.83 mg C m −2 d −1 , depending on depth and PAR, whereas in situ production of phytoplankton averaged 15% of this. Annual patterns of mat production achieved maximum rates of 15–16 g C m −2 y −1 at 10 m depth when ≥ 5% of ambient PAR was transmitted through the ice covering the lake; observed transmittance values were usually ≤ 5%. Increasing underwater PAR had little effect above 5–7% transmittance, as photosynthesis became saturated at this level. Uncertainties in estimates of maximum photosynthetic rate ( P max ), initial slope of photosynthetic-light response (α) and maximum respiration rate ( R max ) explained 72–99% of uncertainty in model behaviour; P max was increasingly important at high light levels whereas α was more important at low light levels, however R max exerted the greatest influence under most conditions. |
format |
Article in Journal/Newspaper |
author |
MOORHEAD, DARYL SCHMELING, JAMIE HAWES, IAN |
spellingShingle |
MOORHEAD, DARYL SCHMELING, JAMIE HAWES, IAN Modelling the contribution of benthic microbial mats to net primary production in Lake Hoare, McMurdo Dry Valleys |
author_facet |
MOORHEAD, DARYL SCHMELING, JAMIE HAWES, IAN |
author_sort |
MOORHEAD, DARYL |
title |
Modelling the contribution of benthic microbial mats to net primary production in Lake Hoare, McMurdo Dry Valleys |
title_short |
Modelling the contribution of benthic microbial mats to net primary production in Lake Hoare, McMurdo Dry Valleys |
title_full |
Modelling the contribution of benthic microbial mats to net primary production in Lake Hoare, McMurdo Dry Valleys |
title_fullStr |
Modelling the contribution of benthic microbial mats to net primary production in Lake Hoare, McMurdo Dry Valleys |
title_full_unstemmed |
Modelling the contribution of benthic microbial mats to net primary production in Lake Hoare, McMurdo Dry Valleys |
title_sort |
modelling the contribution of benthic microbial mats to net primary production in lake hoare, mcmurdo dry valleys |
publisher |
Cambridge University Press (CUP) |
publishDate |
2005 |
url |
http://dx.doi.org/10.1017/s0954102005002403 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102005002403 |
long_lat |
ENVELOPE(162.850,162.850,-77.633,-77.633) ENVELOPE(162.850,162.850,-77.633,-77.633) |
geographic |
Hoare Lake Hoare McMurdo Dry Valleys Victoria Land |
geographic_facet |
Hoare Lake Hoare McMurdo Dry Valleys Victoria Land |
genre |
Antarc* Antarctic Science Antarctica McMurdo Dry Valleys Victoria Land |
genre_facet |
Antarc* Antarctic Science Antarctica McMurdo Dry Valleys Victoria Land |
op_source |
Antarctic Science volume 17, issue 1, page 33-45 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102005002403 |
container_title |
Antarctic Science |
container_volume |
17 |
container_issue |
1 |
container_start_page |
33 |
op_container_end_page |
45 |
_version_ |
1802651286633447424 |