Timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake.
Lake Vanda is a perennially ice-covered, closed-basin lake in the McMurdo Dry Valleys, Antarctica. Laminated photosynthetic microbial mats cover the floor of the lake from below the ice cover to >40 m depth. In recent decades, the water level of Lake Vanda has been rising, creating a "natura...
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ftcdlib:oai:escholarship.org/ark:/13030/qt6g37d1nr 2023-05-15T14:00:50+02:00 Timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake. Hawes, Ian Sumner, Dawn Y Andersen, Dale T Jungblut, Anne D Mackey, Tyler J 151 - 176 2013-01-25 application/pdf https://escholarship.org/uc/item/6g37d1nr unknown eScholarship, University of California qt6g37d1nr https://escholarship.org/uc/item/6g37d1nr public Biology, vol 2, iss 1 Biological Sciences article 2013 ftcdlib 2020-06-06T07:53:41Z Lake Vanda is a perennially ice-covered, closed-basin lake in the McMurdo Dry Valleys, Antarctica. Laminated photosynthetic microbial mats cover the floor of the lake from below the ice cover to >40 m depth. In recent decades, the water level of Lake Vanda has been rising, creating a "natural experiment" on development of mat communities on newly flooded substrates and the response of deeper mats to declining irradiance. Mats in recently flooded depths accumulate one lamina (~0.3 mm) per year and accrue ~0.18 µg chlorophyll-a cm-2 y-1. As they increase in thickness, vertical zonation becomes evident, with the upper 2-4 laminae forming an orange-brown zone, rich in myxoxanthophyll and dominated by intertwined Leptolyngbya trichomes. Below this, up to six phycobilin-rich green/pink-pigmented laminae form a subsurface zone, inhabited by Leptolyngbya, Oscillatoria and Phormidium morphotypes. Laminae continued to increase in thickness for several years after burial, and PAM fluorometry indicated photosynthetic potential in all pigmented laminae. At depths that have been submerged for >40 years, mats showed similar internal zonation and formed complex pinnacle structures that were only beginning to appear in shallower mats. Chlorophyll-a did not change over time and these mats appear to represent resource-limited "climax" communities. Acclimation of microbial mats to changing environmental conditions is a slow process, and our data show how legacy effects of past change persist into the modern community structure. Article in Journal/Newspaper Antarc* Antarctic Antarctica McMurdo Dry Valleys University of California: eScholarship Antarctic Basin Lake ENVELOPE(161.917,161.917,-76.150,-76.150) Lake Vanda ENVELOPE(161.600,161.600,-77.517,-77.517) McMurdo Dry Valleys Pinnacle ENVELOPE(-54.900,-54.900,-61.067,-61.067) Vanda ENVELOPE(161.550,161.550,-77.533,-77.533) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Biological Sciences |
spellingShingle |
Biological Sciences Hawes, Ian Sumner, Dawn Y Andersen, Dale T Jungblut, Anne D Mackey, Tyler J Timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake. |
topic_facet |
Biological Sciences |
description |
Lake Vanda is a perennially ice-covered, closed-basin lake in the McMurdo Dry Valleys, Antarctica. Laminated photosynthetic microbial mats cover the floor of the lake from below the ice cover to >40 m depth. In recent decades, the water level of Lake Vanda has been rising, creating a "natural experiment" on development of mat communities on newly flooded substrates and the response of deeper mats to declining irradiance. Mats in recently flooded depths accumulate one lamina (~0.3 mm) per year and accrue ~0.18 µg chlorophyll-a cm-2 y-1. As they increase in thickness, vertical zonation becomes evident, with the upper 2-4 laminae forming an orange-brown zone, rich in myxoxanthophyll and dominated by intertwined Leptolyngbya trichomes. Below this, up to six phycobilin-rich green/pink-pigmented laminae form a subsurface zone, inhabited by Leptolyngbya, Oscillatoria and Phormidium morphotypes. Laminae continued to increase in thickness for several years after burial, and PAM fluorometry indicated photosynthetic potential in all pigmented laminae. At depths that have been submerged for >40 years, mats showed similar internal zonation and formed complex pinnacle structures that were only beginning to appear in shallower mats. Chlorophyll-a did not change over time and these mats appear to represent resource-limited "climax" communities. Acclimation of microbial mats to changing environmental conditions is a slow process, and our data show how legacy effects of past change persist into the modern community structure. |
format |
Article in Journal/Newspaper |
author |
Hawes, Ian Sumner, Dawn Y Andersen, Dale T Jungblut, Anne D Mackey, Tyler J |
author_facet |
Hawes, Ian Sumner, Dawn Y Andersen, Dale T Jungblut, Anne D Mackey, Tyler J |
author_sort |
Hawes, Ian |
title |
Timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake. |
title_short |
Timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake. |
title_full |
Timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake. |
title_fullStr |
Timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake. |
title_full_unstemmed |
Timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake. |
title_sort |
timescales of growth response of microbial mats to environmental change in an ice-covered antarctic lake. |
publisher |
eScholarship, University of California |
publishDate |
2013 |
url |
https://escholarship.org/uc/item/6g37d1nr |
op_coverage |
151 - 176 |
long_lat |
ENVELOPE(161.917,161.917,-76.150,-76.150) ENVELOPE(161.600,161.600,-77.517,-77.517) ENVELOPE(-54.900,-54.900,-61.067,-61.067) ENVELOPE(161.550,161.550,-77.533,-77.533) |
geographic |
Antarctic Basin Lake Lake Vanda McMurdo Dry Valleys Pinnacle Vanda |
geographic_facet |
Antarctic Basin Lake Lake Vanda McMurdo Dry Valleys Pinnacle Vanda |
genre |
Antarc* Antarctic Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Dry Valleys |
op_source |
Biology, vol 2, iss 1 |
op_relation |
qt6g37d1nr https://escholarship.org/uc/item/6g37d1nr |
op_rights |
public |
_version_ |
1766270174260887552 |