The amount of light reaching the leaves in seagrass (Zostera marina) meadows.

Seagrass meadows, and other submerged vegetated habitats, support a wide range of essential ecological services, but the true extents of these services are in many ways still not quantified. One important tool needed to assess and model many of these services is accurate estimations of the systems´...

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Autores principales:	Mats Björk, Maria E Asplund, Diana Deyanova, Martin Gullström
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ecd0e8b429d848fb92f33f4325d02319
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spelling	oai:doaj.org-article:ecd0e8b429d848fb92f33f4325d023192021-12-02T20:14:26ZThe amount of light reaching the leaves in seagrass (Zostera marina) meadows.1932-620310.1371/journal.pone.0257586https://doaj.org/article/ecd0e8b429d848fb92f33f4325d023192021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0257586https://doaj.org/toc/1932-6203Seagrass meadows, and other submerged vegetated habitats, support a wide range of essential ecological services, but the true extents of these services are in many ways still not quantified. One important tool needed to assess and model many of these services is accurate estimations of the systems´ primary productivity. Such productivity estimations require an understanding of the underwater light field, especially regarding the amount of light that actually reaches the plants' photosynthetic tissue. In this study, we tested a simple practical approach to estimate leaf light exposure, relative to incoming light at the canopy, by attaching light sensitive film at different positions on leaves of Zostera marina, eelgrass, in four seagrass meadows composed of different shoot density and at two different depths. We found that the light reaching the leaves decreased linearly down through the canopy. While the upper parts of the leaves received approximately the same level of light (photosynthetic photon flux density, PPFD) as recorded with a PAR meter at the canopy top, the average light that the seagrass leaves were exposed to varied between 40 and 60% of the light on top of the canopy, with an overall average of 48%. We recommend that actual light interception is measured when assessing or modelling light depending processes in submerged vegetation, but if this is not achievable a rough estimation for vegetation similar to Z. marina would be to use a correction factor of 0.5 to compensate for the reduced light due to leaf orientation and internal shading.Mats BjörkMaria E AsplundDiana DeyanovaMartin GullströmPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 9, p e0257586 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mats Björk Maria E Asplund Diana Deyanova Martin Gullström The amount of light reaching the leaves in seagrass (Zostera marina) meadows.
description	Seagrass meadows, and other submerged vegetated habitats, support a wide range of essential ecological services, but the true extents of these services are in many ways still not quantified. One important tool needed to assess and model many of these services is accurate estimations of the systems´ primary productivity. Such productivity estimations require an understanding of the underwater light field, especially regarding the amount of light that actually reaches the plants' photosynthetic tissue. In this study, we tested a simple practical approach to estimate leaf light exposure, relative to incoming light at the canopy, by attaching light sensitive film at different positions on leaves of Zostera marina, eelgrass, in four seagrass meadows composed of different shoot density and at two different depths. We found that the light reaching the leaves decreased linearly down through the canopy. While the upper parts of the leaves received approximately the same level of light (photosynthetic photon flux density, PPFD) as recorded with a PAR meter at the canopy top, the average light that the seagrass leaves were exposed to varied between 40 and 60% of the light on top of the canopy, with an overall average of 48%. We recommend that actual light interception is measured when assessing or modelling light depending processes in submerged vegetation, but if this is not achievable a rough estimation for vegetation similar to Z. marina would be to use a correction factor of 0.5 to compensate for the reduced light due to leaf orientation and internal shading.
format	article
author	Mats Björk Maria E Asplund Diana Deyanova Martin Gullström
author_facet	Mats Björk Maria E Asplund Diana Deyanova Martin Gullström
author_sort	Mats Björk
title	The amount of light reaching the leaves in seagrass (Zostera marina) meadows.
title_short	The amount of light reaching the leaves in seagrass (Zostera marina) meadows.
title_full	The amount of light reaching the leaves in seagrass (Zostera marina) meadows.
title_fullStr	The amount of light reaching the leaves in seagrass (Zostera marina) meadows.
title_full_unstemmed	The amount of light reaching the leaves in seagrass (Zostera marina) meadows.
title_sort	amount of light reaching the leaves in seagrass (zostera marina) meadows.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/ecd0e8b429d848fb92f33f4325d02319
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The amount of light reaching the leaves in seagrass (Zostera marina) meadows.

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