東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Linked to FindBook

Google Book

Amazon

博客來

Ecological Significance of Cyanobacteria Pigment Color Acclimation in the Ocean.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Ecological Significance of Cyanobacteria Pigment Color Acclimation in the Ocean./
Author:	Lovindeer, Raisha Anne Elizabeth.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	143 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
Contained By:	Dissertations Abstracts International83-02B.
Subject:	Biological oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28412276
ISBN:	9798522946685

Ecological Significance of Cyanobacteria Pigment Color Acclimation in the Ocean.
Lovindeer, Raisha Anne Elizabeth.

Ecological Significance of Cyanobacteria Pigment Color Acclimation in the Ocean. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 143 p.

Source: Dissertations Abstracts International, Volume: 83-02, Section: B.

Thesis (Ph.D.)--University of California, Irvine, 2021.

This item is not available from ProQuest Dissertations & Theses.

Chromatic acclimation by marine Synechococcus cyanobacteria is a colorful example of light-harvesting generalists, that change their phycoerythrin pigment to absorb blue (495 nm) or green (545 nm) light (type IV chromatic acclimation, or CA4). Though much is known about the molecular regulation of the trait, the ocean environment that selects for this acclimation strategy is not well understood. Similarly, the ecological costs of CA4 compared to Synechococcus strains with fixed pigment strategies (specialists) had not previously been investigated. This research used a combination of laboratory experiments, a competition model between Synechococcus generalists and specialists in simulated spectral environments, and comparisons with metagenomic and physical oceanographic in situ data from global ocean cruises, Argo floats, and satellites to address these gaps. Under experimental conditions, we show that blue-green generalists suffer an energetic cost across variable environments compared to specialists, and that all Synechococcus strains are twice as efficient in green light as in blue light. In model simulations, Synechococcus generalists had >70% correlation with deep mixed layers, but only 14% correlation with mixed layers in situ. Higher correlations were observed with low average mixed layer temperatures (< 14oC), low sea surface height, and large sea surface gradients, indicating upwelling zones and ocean fronts are important niches for generalists in the ocean. We propose that the main advantage of CA4 is not in direct competition with other Synechococcus strains, but in expanding the niche space of the genus into highly dynamic ocean environments.In application of light color and pigment research to ecosystem management, the final chapter of this dissertation is a case study using the spectral shape produced by absorption and fluorescence of the marker pigment phycocyanin to detect cyanobacteria by field-based remote sensing. We test four algorithms to detect cyanobacteria blooms across a salinity gradient from freshwater to the Atlantic Ocean. We find that empirical algorithms centered around longer wavelengths in the red spectral region (~700 nm), such as Mean Peak Height for turbid waters, worked best for cyanobacteria detection and prediction. An expansion of this algorithm could be used to develop an early warning system for harmful cyanobacteria blooms in the region.

ISBN: 9798522946685Subjects--Topical Terms:

2122748
Biological oceanography.
Subjects--Index Terms:

Cyanobacteria pigment color acclimation

Ecological Significance of Cyanobacteria Pigment Color Acclimation in the Ocean.
LDR:03619nmm a2200349 4500 001 2346193
005 20220620110440.5
008 241004s2021 ||||||||||||||||| ||eng d
020 $a 9798522946685
035 $a (MiAaPQ)AAI28412276
035 $a AAI28412276
040 $a MiAaPQ $c MiAaPQ
100 1 $a Lovindeer, Raisha Anne Elizabeth. $3 3685246
245 1 0 $a Ecological Significance of Cyanobacteria Pigment Color Acclimation in the Ocean.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 143 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
500 $a Advisor: Mackey, Katherine R. M. .
502 $a Thesis (Ph.D.)--University of California, Irvine, 2021.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a Chromatic acclimation by marine Synechococcus cyanobacteria is a colorful example of light-harvesting generalists, that change their phycoerythrin pigment to absorb blue (495 nm) or green (545 nm) light (type IV chromatic acclimation, or CA4). Though much is known about the molecular regulation of the trait, the ocean environment that selects for this acclimation strategy is not well understood. Similarly, the ecological costs of CA4 compared to Synechococcus strains with fixed pigment strategies (specialists) had not previously been investigated. This research used a combination of laboratory experiments, a competition model between Synechococcus generalists and specialists in simulated spectral environments, and comparisons with metagenomic and physical oceanographic in situ data from global ocean cruises, Argo floats, and satellites to address these gaps. Under experimental conditions, we show that blue-green generalists suffer an energetic cost across variable environments compared to specialists, and that all Synechococcus strains are twice as efficient in green light as in blue light. In model simulations, Synechococcus generalists had >70% correlation with deep mixed layers, but only 14% correlation with mixed layers in situ. Higher correlations were observed with low average mixed layer temperatures (< 14oC), low sea surface height, and large sea surface gradients, indicating upwelling zones and ocean fronts are important niches for generalists in the ocean. We propose that the main advantage of CA4 is not in direct competition with other Synechococcus strains, but in expanding the niche space of the genus into highly dynamic ocean environments.In application of light color and pigment research to ecosystem management, the final chapter of this dissertation is a case study using the spectral shape produced by absorption and fluorescence of the marker pigment phycocyanin to detect cyanobacteria by field-based remote sensing. We test four algorithms to detect cyanobacteria blooms across a salinity gradient from freshwater to the Atlantic Ocean. We find that empirical algorithms centered around longer wavelengths in the red spectral region (~700 nm), such as Mean Peak Height for turbid waters, worked best for cyanobacteria detection and prediction. An expansion of this algorithm could be used to develop an early warning system for harmful cyanobacteria blooms in the region.
590 $a School code: 0030.
650 4 $a Biological oceanography. $3 2122748
650 4 $a Physical oceanography. $3 3168433
650 4 $a Remote sensing. $3 535394
650 4 $a Plankton. $3 1299572
650 4 $a Science. $3 516376
650 4 $a Chlorophyll. $3 1004345
650 4 $a Scholarships & fellowships. $3 3560311
653 $a Cyanobacteria pigment color acclimation
653 $a Ecological significance
690 $a 0416
690 $a 0415
690 $a 0799
710 2 $a University of California, Irvine. $b Earth System Science - Ph.D.. $3 2100202
773 0 $t Dissertations Abstracts International $g 83-02B.
790 $a 0030
791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28412276