Show simple item record

dc.contributor.advisorVoolstra, Christian R.
dc.contributor.authorPerna, Gabriela
dc.date.accessioned2019-05-06T08:05:54Z
dc.date.available2020-05-01T00:00:00Z
dc.date.issued2019-04
dc.identifier.citationPerna, G. (2019). Standardized short-term bleaching assays resolve differences in coral thermotolerance across microhabitat reef sites. KAUST Research Repository. https://doi.org/10.25781/KAUST-98X34
dc.identifier.doi10.25781/KAUST-98X34
dc.identifier.urihttp://hdl.handle.net/10754/644907
dc.description.abstractCoral bleaching is now the main driver of reef degradation. The common notion is that most corals bleach and suffer mortality at just 1-2°C above their mean summer maximum temperatures, but some species and genotypes resist or recover better than others. Here we conducted a series of 18-hour short-term heat stress assays side-by-side with a long-term heat stress experiment to assess the ability of both approaches to resolve putative differences in coral thermotolerance and provide a measure of in situ reef temperature thresholds. Using a suite of measures (photosynthetic performance, coral whitening, chlorophyll a, host protein, algal symbiont counts, and algal type association), we assessed bleaching sensitivity/resilience of Stylophora pistillata colonies from the exposed and protected sides of a near-shore coral reef in the central Red Sea. As suggested by the differential mortality during a previous bleaching event, coral colonies from the protected site exhibited less impacted physiological performance in comparison to their exposed site counterparts, and these differences were resolved using both experimental setups. Notably, the long-term experiment provided better resolution with regard to the different measures collected, but at the price of portability, cost, and duration of the experiment. Variability in resilience to ocean warming is critical to reef persistence, yet we lack standardized diagnostics to rapidly assess bleaching severity or resilience across different corals and locations. Using a newly developed portable experimental system termed CBASS (the Coral Bleaching Automated Stress System), we demonstrate that mobile, short-term heat stress assays can resolve fine-scale differences in coral thermotolerance across reef sites. Based on our results, photosynthetic efficiency measured by non-invasive PAM fluorometry provides a rapid and representative proxy of coral resilience. Our system holds the potential to be employed for large-scale determination of in situ bleaching temperature thresholds across reef sites and species. Such data can then be used to identify resistant genotypes (and reefs) for downstream experimental examination and to complement existing remote-sensing approaches.
dc.language.isoen
dc.subjectCoral Reef
dc.subjectClimate Change
dc.subjectHeat Stress
dc.subjectCoral Bleaching
dc.subjectResilience
dc.subjectRed Sea
dc.titleStandardized short-term bleaching assays resolve differences in coral thermotolerance across microhabitat reef sites
dc.typeThesis
dc.contributor.departmentBiological and Environmental Science and Engineering (BESE) Division
dc.rights.embargodate2020-05-01
thesis.degree.grantorKing Abdullah University of Science and Technology
dc.contributor.committeememberAranda, Manuel
dc.contributor.committeememberTester, Mark A.
thesis.degree.disciplineMarine Science
thesis.degree.nameMaster of Science
dc.rights.accessrightsAt the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2020-05-01.
refterms.dateFOA2020-05-01T00:00:00Z
kaust.request.doiyes


Files in this item

Thumbnail
Name:
MS Thesis_Gabriela Perna_Final.pdf
Size:
1.750Mb
Format:
PDF
Description:
MS Thesis

This item appears in the following Collection(s)

Show simple item record