Impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: A modeling study
Filamentous cyanobacteria often dominate benthic microbial communities of antarctic lakes and usually exhibit saturation of photosynthesis at light intensities ∼100 µ Einst m −2 s −1 . Incident light regimes are controlled by ice and snow accumulations overlaying water columns during much of the yea...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.1997.42.7.1561 2023-12-03T10:13:38+01:00 Impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: A modeling study Moorhead, Daryl L. Wolf, Craig F. Wharton, Robert A. 1997 http://dx.doi.org/10.4319/lo.1997.42.7.1561 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1997.42.7.1561 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1997.42.7.1561 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 42, issue 7, page 1561-1569 ISSN 0024-3590 1939-5590 Aquatic Science Oceanography journal-article 1997 crwiley https://doi.org/10.4319/lo.1997.42.7.1561 2023-11-09T14:16:41Z Filamentous cyanobacteria often dominate benthic microbial communities of antarctic lakes and usually exhibit saturation of photosynthesis at light intensities ∼100 µ Einst m −2 s −1 . Incident light regimes are controlled by ice and snow accumulations overlaying water columns during much of the year. Thus, light availability to microbial mats is often below saturation intensity and is strongly influenced by modest changes in climatic factors. A model of net primary production for benthic mat communities of the subantarctic Sombre Lake, Signy Island, was developed (1) to evaluate depth‐specific productivities of mat communities, (2) to test the relative importances of model parameters to mat production, and (3) to explore the potential impacts of climate change on mat production as manifested through changes in light regime. Simulated rates of net primary production corresponded to observations on a daily basis (∼1–4 µ g C fixed mg −1 ash‐free DW of mat d −1 ) but were an order of magnitude lower than estimates of net annual production based on field measurements (≤3 vs. 11–45 g C m −2 yr −1 , respectively). Close examination suggested that the simulated values were more plausible. A detailed sensitivity analysis of model behavior revealed that variations in the time of ice and snow melt in spring accounted for 40–60% of the total variation in model behavior, emphasizing the importance of climatic factors to net primary production of mat communities and the sensitivity of mat production to climate change. Article in Journal/Newspaper Antarc* Antarctic Signy Island Wiley Online Library (via Crossref) Antarctic Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Sombre Lake ENVELOPE(-45.615,-45.615,-60.687,-60.687) Limnology and Oceanography 42 7 1561 1569 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Oceanography |
spellingShingle |
Aquatic Science Oceanography Moorhead, Daryl L. Wolf, Craig F. Wharton, Robert A. Impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: A modeling study |
topic_facet |
Aquatic Science Oceanography |
description |
Filamentous cyanobacteria often dominate benthic microbial communities of antarctic lakes and usually exhibit saturation of photosynthesis at light intensities ∼100 µ Einst m −2 s −1 . Incident light regimes are controlled by ice and snow accumulations overlaying water columns during much of the year. Thus, light availability to microbial mats is often below saturation intensity and is strongly influenced by modest changes in climatic factors. A model of net primary production for benthic mat communities of the subantarctic Sombre Lake, Signy Island, was developed (1) to evaluate depth‐specific productivities of mat communities, (2) to test the relative importances of model parameters to mat production, and (3) to explore the potential impacts of climate change on mat production as manifested through changes in light regime. Simulated rates of net primary production corresponded to observations on a daily basis (∼1–4 µ g C fixed mg −1 ash‐free DW of mat d −1 ) but were an order of magnitude lower than estimates of net annual production based on field measurements (≤3 vs. 11–45 g C m −2 yr −1 , respectively). Close examination suggested that the simulated values were more plausible. A detailed sensitivity analysis of model behavior revealed that variations in the time of ice and snow melt in spring accounted for 40–60% of the total variation in model behavior, emphasizing the importance of climatic factors to net primary production of mat communities and the sensitivity of mat production to climate change. |
format |
Article in Journal/Newspaper |
author |
Moorhead, Daryl L. Wolf, Craig F. Wharton, Robert A. |
author_facet |
Moorhead, Daryl L. Wolf, Craig F. Wharton, Robert A. |
author_sort |
Moorhead, Daryl L. |
title |
Impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: A modeling study |
title_short |
Impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: A modeling study |
title_full |
Impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: A modeling study |
title_fullStr |
Impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: A modeling study |
title_full_unstemmed |
Impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: A modeling study |
title_sort |
impact of light regimes on productivity patterns of benthic microbial mats in an antarctic lake: a modeling study |
publisher |
Wiley |
publishDate |
1997 |
url |
http://dx.doi.org/10.4319/lo.1997.42.7.1561 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1997.42.7.1561 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1997.42.7.1561 |
long_lat |
ENVELOPE(-45.595,-45.595,-60.708,-60.708) ENVELOPE(-45.615,-45.615,-60.687,-60.687) |
geographic |
Antarctic Signy Island Sombre Lake |
geographic_facet |
Antarctic Signy Island Sombre Lake |
genre |
Antarc* Antarctic Signy Island |
genre_facet |
Antarc* Antarctic Signy Island |
op_source |
Limnology and Oceanography volume 42, issue 7, page 1561-1569 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.1997.42.7.1561 |
container_title |
Limnology and Oceanography |
container_volume |
42 |
container_issue |
7 |
container_start_page |
1561 |
op_container_end_page |
1569 |
_version_ |
1784260471051780096 |