Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes

Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes

Bibliographic Details
Main Author: Straube, Korinna
Language:English
Published: Bowling Green State University / OhioLINK 2008
Subjects:
Biology
Laurentian Great Lakes
photosynthesis-irradiance (PI) curves
photoacclimation
Synechococcus
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1214192520
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-bgsu12141925202021-08-03T05:28:38Z Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes Straube, Korinna Biology Laurentian Great Lakes photosynthesis-irradiance (PI) curves photoacclimation Synechococcus <p>Light availability is one of the major factors guiding production patterns of photoautotrophs such as cyanobacteria. In this study, photosynthesis-irradiance (PI) curves were used to determine photosynthetic efficiency (α), photosynthetic maxima (Pmax) and onset of light-saturated photosynthesis (Ik). Those parameters are used to characterize photoacclimation to provide information on productivity under varying light levels. Radioactively labeled carbon was incorporated into organic matter in water samples from Lake Superior and Synechococcus sp. isolates from Lake Erie and Lake Superior growing under low- and high-light conditions (15 vs. 70 μmol photons m-2s-1). Measurements of in vivo chlorophyll a fluorescence were used to determine growth rates of the picocyanobacterial strains.</p><p>Photosynthetic performance of the pico-size fraction in comparison to total phytoplankton in Lake Superior displayed an increase in photosynthetic contribution by the size fraction with water depth. Differences of photosynthetic performances between Lake Erie and Lake Superior isolates could not be found. Most isolates from Lake Superior did not show significant differences in photosynthetic efficiencies for low-light vs. high-light adapted cultures. Lake Erie isolate KD3a showed higher efficiencies under high light conditions. Lake Erie strain Arc11 showed higher photosynthetic maxima for the low-light adapted culture. These surprising patterns might explain the dominance of these strains within Lake Erie, having the ability to respond to changing light fields with the lake.</p> 2008-08-06 English text Bowling Green State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1214192520 http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1214192520 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Biology
Laurentian Great Lakes
photosynthesis-irradiance (PI) curves
photoacclimation
Synechococcus
spellingShingle Biology
Laurentian Great Lakes
photosynthesis-irradiance (PI) curves
photoacclimation
Synechococcus
Straube, Korinna
Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes
author Straube, Korinna
author_facet Straube, Korinna
author_sort Straube, Korinna
title Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes
title_short Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes
title_full Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes
title_fullStr Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes
title_full_unstemmed Characterization of the Contribution of Picocyaonobacteria to Primary Production in the Laurentian Great Lakes
title_sort characterization of the contribution of picocyaonobacteria to primary production in the laurentian great lakes
publisher Bowling Green State University / OhioLINK
publishDate 2008
url http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1214192520
work_keys_str_mv AT straubekorinna characterizationofthecontributionofpicocyaonobacteriatoprimaryproductioninthelaurentiangreatlakes
_version_ 1719420627045056512

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