Chronic light reduction reduces overall resilience to additional shading stress in the seagrass Halophila ovalis

Siti M. Yaakub; Eugene Chen; Tjeerd J. Bouma; Paul L.A. Erftemeijer; Peter A. Todd

doi:10.1016/j.marpolbul.2013.11.030

Chronic light reduction reduces overall resilience to additional shading stress in the seagrass Halophila ovalis

Siti M. Yaakub, Eugene Chen, Tjeerd J. Bouma, Paul L.A. Erftemeijer, Peter A. Todd^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Seagrasses have substantial capacity to survive long periods of light reduction, but how acclimation to chronic low light environments may influence their ability to cope with additional stress is poorly understood. This study examines the effect of temporal light reduction by adding two levels of shading to Halophila ovalis plants in two meadows with different light histories, one characterized by a low light (turbid) environment and the other by a relatively high light (clear) environment. Additional shading resulted in complete mortality for both shading treatments at the turbid site while the clear site showed a pattern of decreased shoot density and increased photochemical efficiency (F_v/. F_m) with increased shading. These contrasting results for the same species in two different locations indicate that acclimation to chronic low light regimes can affect seagrass resilience and highlights the importance of light history in determining the outcome of exposure to further (short-term) stress.

Original language	English
Pages (from-to)	467-474
Number of pages	8
Journal	Marine Pollution Bulletin
Volume	83
Issue number	2
DOIs	https://doi.org/10.1016/j.marpolbul.2013.11.030
Publication status	Published - 30 Jun 2014

Bibliographical note

Funding Information:
The authors thank all the volunteers who helped with fieldwork. Thanks also to the two anonymous reviewers whose comments and suggestions helped improve this manuscript. This study was conducted under the National Parks Board Research Permit Number NP/RP 9850-1 and funded by Singapore-Delft Water Alliance’s Marine & Coastal Research Programme (Theme 2): ‘‘Dredging and infrastructure development near critical marine ecosystems” (R-264-001-007-272).

Funding

The authors thank all the volunteers who helped with fieldwork. Thanks also to the two anonymous reviewers whose comments and suggestions helped improve this manuscript. This study was conducted under the National Parks Board Research Permit Number NP/RP 9850-1 and funded by Singapore-Delft Water Alliance’s Marine & Coastal Research Programme (Theme 2): ‘‘Dredging and infrastructure development near critical marine ecosystems” (R-264-001-007-272).

Keywords

Acclimation
Light history
Sediment
Singapore
Turbidity

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10.1016/j.marpolbul.2013.11.030

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abstract = "Seagrasses have substantial capacity to survive long periods of light reduction, but how acclimation to chronic low light environments may influence their ability to cope with additional stress is poorly understood. This study examines the effect of temporal light reduction by adding two levels of shading to Halophila ovalis plants in two meadows with different light histories, one characterized by a low light (turbid) environment and the other by a relatively high light (clear) environment. Additional shading resulted in complete mortality for both shading treatments at the turbid site while the clear site showed a pattern of decreased shoot density and increased photochemical efficiency (Fv/. Fm) with increased shading. These contrasting results for the same species in two different locations indicate that acclimation to chronic low light regimes can affect seagrass resilience and highlights the importance of light history in determining the outcome of exposure to further (short-term) stress.",

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AU - Todd, Peter A.

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AB - Seagrasses have substantial capacity to survive long periods of light reduction, but how acclimation to chronic low light environments may influence their ability to cope with additional stress is poorly understood. This study examines the effect of temporal light reduction by adding two levels of shading to Halophila ovalis plants in two meadows with different light histories, one characterized by a low light (turbid) environment and the other by a relatively high light (clear) environment. Additional shading resulted in complete mortality for both shading treatments at the turbid site while the clear site showed a pattern of decreased shoot density and increased photochemical efficiency (Fv/. Fm) with increased shading. These contrasting results for the same species in two different locations indicate that acclimation to chronic low light regimes can affect seagrass resilience and highlights the importance of light history in determining the outcome of exposure to further (short-term) stress.

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Chronic light reduction reduces overall resilience to additional shading stress in the seagrass Halophila ovalis

Abstract

Bibliographical note

Funding

Keywords

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