Please use this identifier to cite or link to this item: https://doi.org/10.3390/jmse9101096
Title: Emersion?associated responses of an intertidal coral and its suitability for transplantation to ecologically engineer seawalls
Authors: Yong, Clara Lei Xin
Poquita?du, Rosa Celia 
Huang, Danwei 
Todd, Peter Alan 
Keywords: Air exposure
Coral gene expression
Ecological engineering
Photophysiology
Issue Date: 7-Oct-2021
Publisher: MDPI
Citation: Yong, Clara Lei Xin, Poquita?du, Rosa Celia, Huang, Danwei, Todd, Peter Alan (2021-10-07). Emersion?associated responses of an intertidal coral and its suitability for transplantation to ecologically engineer seawalls. Journal of Marine Science and Engineering 9 (10) : 1096. ScholarBank@NUS Repository. https://doi.org/10.3390/jmse9101096
Rights: Attribution 4.0 International
Abstract: There is a growing interest in transplanting corals onto the intertidal section of artificial coastal defences (e.g., seawalls) as an ecological engineering strategy to enhance biodiversity on urban shores. However, this inevitably results in exposure to the harsh environmental conditions associated with emersion (aerial exposure). Although the effects of a multitude of environmental stressors on corals have been examined, their photophysiological and gene expression responses to emersion stress remain understudied, as does the among?genotype variation in these responses. In this study, we conducted an in situ experiment to test the effects of increased daily emersion duration on a locally common intertidal coral, Dipsastraea cf. lizardensis. Coral fragments (n = 3) from five genotypically distinct colonies were subjected to two treatments: (1) increased daily emersion duration (~4.5 h d?1) and, (2) control (~3 h d?1) for three consecutive days during spring low tide. We examined the post?experimental photophysiological responses and expression level of a stress?associated gene, Hsp16. Relative to the controls, coral fragments that were exposed to longer daily emersion duration displayed significantly reduced effective quantum yield, while endosymbiont density varied significantly among genotypes across the experimental conditions. We found no significant differences in chlorophyll a concentration and Hsp16 gene expression level, suggesting that changes in these processes may be gradual and the duration of treatment that the corals were subjected to is likely within their tolerance limits. Taken together, it appears that D. cf. lizardensis dis-plays substantial capacity to cope with sup?optimal conditions associated with emersion which makes it a promising candidate for transplantation onto intertidal seawalls. However, within?species variation in their stress response indicates that not all genotypes respond similarly to emersion, and this should be taken into account when selecting donor colonies for transplantation. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Source Title: Journal of Marine Science and Engineering
URI: https://scholarbank.nus.edu.sg/handle/10635/232391
ISSN: 2077-1312
DOI: 10.3390/jmse9101096
Rights: Attribution 4.0 International
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