Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage?

Research Seminar on Research for MUIC Development, Mahidol University International College, Thailand.

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Bibliographic Details
Main Author:	Phillips, Wayne
Other Authors:	Mahidol University. Internationa College. Science Division.
Format:	Proceeding Book
Language:	English
Published:	2015
Subjects:	Pulse Amplitude Modulated (PAM) fluorometry Porites lobata Dynamic photoinhibition
Online Access:	https://repository.li.mahidol.ac.th/handle/123456789/35031
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Institution:	Mahidol University
Language:	English

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spelling	th-mahidol.350312023-04-12T15:27:55Z Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage? Phillips, Wayne Mahidol University. Internationa College. Science Division. Pulse Amplitude Modulated (PAM) fluorometry Porites lobata Dynamic photoinhibition Research Seminar on Research for MUIC Development, Mahidol University International College, Thailand. Objective: To determine whether different faces of a large hemispherical shaped Porites coral head respond differently to ambient light at different times of the day. Methods: A portable underwater Diving-PAM fluorometer was used for chlorophyll fluorescence measurements on distinct areas of a large Porites lobata coral head (diameter >2.5m) oriented in a north, south, east and west direction. Photosynthetic response to irradiance was measured as rapid light curves (RLCs). From these RLCs a number of parameters were derived. Fv/Fm – the maximum photochemical efficiency of photosystem 2 (PS2) and the relative maximum rate of electron transport at saturating light intensities (rETRmax). All measurements were carried out at 1000hrs, 1300hrs and 1600hrs over a three day period. Results: The top surface of the coral showed the lowest Fv/Fm values (e.g. 0.49 on day 1 at 1300hrs) with the north-facing side showing the highest values (e.g. 0.69 day 1 and 2 even at 1300hrs). Although Fv/Fm showed consistent decreases according to orientation and time of day, rETRmax showed less consistent variation with time or orientation. The top surface of the coral and the southfacing side showed significantly lower Fv/Fm than other orientations especially at 1300hrs. Conclusion: Mid-day depression in Fv/Fm with little or no change in rETRmax indicates dynamic photoinhibition. 2015-02-03T09:06:01Z 2018-11-20T02:05:44Z 2015-02-03T09:06:01Z 2018-11-20T02:05:44Z 2015-02-03 2007 Proceeding Book https://repository.li.mahidol.ac.th/handle/123456789/35031 eng Mahidol University
institution	Mahidol University
building	Mahidol University Library
continent	Asia
country	Thailand Thailand
content_provider	Mahidol University Library
collection	Mahidol University Institutional Repository
language	English
topic	Pulse Amplitude Modulated (PAM) fluorometry Porites lobata Dynamic photoinhibition
spellingShingle	Pulse Amplitude Modulated (PAM) fluorometry Porites lobata Dynamic photoinhibition Phillips, Wayne Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage?
description	Research Seminar on Research for MUIC Development, Mahidol University International College, Thailand.
author2	Mahidol University. Internationa College. Science Division.
author_facet	Mahidol University. Internationa College. Science Division. Phillips, Wayne
format	Proceeding Book
author	Phillips, Wayne
author_sort	Phillips, Wayne
title	Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage?
title_short	Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage?
title_full	Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage?
title_fullStr	Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage?
title_full_unstemmed	Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage?
title_sort	use of pulse amplitude modulated (pam) flourometry for in situ measurements of photosynthesis of porites lobata, samae san, thailand. is there evidence for photoinhibition and/or photodamage?
publishDate	2015
url	https://repository.li.mahidol.ac.th/handle/123456789/35031
_version_	1781415344101916672

Use of pulse amplitude modulated (PAM) flourometry for in SITU measurements of photosynthesis of porites lobata, Samae San, Thailand. Is there evidence for photoinhibition and/or photodamage?

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