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Please note that, subject to the presenters's approval, all reef e-talks will be recorded and uploaded onto our dedicated YouTube channel and that by registering for the talks you provide us with your explicit consent to do so. The uploaded footage will contain the slideshow of the presenter and his/her image as displayed by his/her video camera and exclude the questions & answers sessions. You may withdraw your consent by cancelling your registration (following the cancel link at the bottom of your registration confirmation email) or sending an email to This email address is being protected from spambots. You need JavaScript enabled to view it.. Please note that you will not be allowed to take part in the talks if you withdraw your consent before they start and that after the recording has been published, we cannot remove it from YouTube. Click here to learn more about ZMT's privacy policy for online seminars.


UPCOMING REEF E-TALKS


OCTOBER

Bleaching-driven reef community shifts: impacts on carbonate budgets and reef sediment generationReef E Talks BUTTON UPDATE

Professor Chris Perry | Chair in Tropical Coastal Geoscience, Geography Department, University of Exeter, UK.

October 15th | 10:00 am  (CEST)

 Chris Perry Better

Abstract

The ecological impacts of coral bleaching on reef communities are well documented, but resultant impacts upon the carbonate budgets of reefs and, especially, upon reef-derived sediment supply are poorly quantified. These are important knowledge gaps because reef budgets influence physical structural maintenance and reef growth potential, and because the biogenic sediments produced by reef taxa often represent the only source of sediment to sustain proximal shorelines and reef islands. This talk outlines the major impacts of the 2016 bleaching event on the carbonate budgets of reefs at sites in the southern Maldives, but then specifically discusses the resultant consequences for sediment generation by the two dominant sediment producers (parrotfish and Halimeda spp.). Recent data identifies two pulses of increased sediment generation in the 3 years since bleaching. The first occurred within approximately six months after bleaching as parrotfish biomass and resultant erosion rates increased, probably in response to enhanced food availability. The second pulse occurred 1 to 3 years post-bleaching, after further increases in parrotfish biomass and a major (approx. fourfold) increase in Halimeda spp. abundance. Total estimated sediment generation from these two producers increased from approximately 0.5 kg CaCO3 m−2 yr−1 (pre-bleaching; 2016) to approximately 3.7 kg CaCO3 m−2 yr−1 (post-bleaching; 2019), highlighting the strong links between reef ecology and sediment generation. However, the relevance of this sediment for shoreline maintenance probably diverges with each producer group, with parrotfish-derived sediment a more appropriate size fraction to potentially contribute to local island shorelines. Underlying these findings are interesting conceptual ideas about how rates of sediment production and supply from reefs may change post-disturbance, about the longevity of any pulse events, and about the potentially cyclical nature of reef-derived sediment supply.


NOVEMBER

Projections of coral cover and habitat change on turbid reefs under future sea-level rise

Dr. Kyle Morgan | AXA Research Fellow, Asian School of the Environment, Nanyang Technological University, Singapore.

Reef E Talks BUTTON UPDATENovember 16th | 09:00 am  (CEST)

 Kyle Morgan Small

Abstract

Global sea-level rise (SLR) is projected to increase water depths above coral reefs. Although the impacts of climate disturbance events on coral cover and three-dimensional complexity are well documented, knowledge of how higher sea levels will influence future reef habitat extent and bioconstruction is limited. Here, we use 31 reef cores, coupled with detailed benthic ecological data, from turbid reefs on the central Great Barrier Reef, Australia, to model broad-scale changes in reef habitat following adjustments to reef geomorphology under different SLR scenarios. Model outputs show that modest increases in relative water depth above reefs (Representative Concentration Pathway (RCP) 4.5) over the next 100 years will increase the spatial extent of habitats with low coral cover and generic diversity. More severe SLR (RCP8.5) will completely submerge reef flats and move reef slope coral communities below the euphotic depth, despite the high vertical accretion rates that characterize these reefs. Our findings suggest adverse future trajectories associated with high emission climate scenarios which could threaten turbid reefs globally and their capacity to act as coral refugia from climate change.

 


PAST REEF E-TALKS

SEPTEMBER

 David Booth                                                                                          YouTube

Opposing climate-change impacts on poleward-shifting coral-reef fishes

Professor David J. Booth | School of Life Sciences University of Technology Sydney

 

AUGUST

Bild Julia.klein                                                                          YouTube

Three-dimensional digital mapping of ecosystems: a new era in spatial ecology

Tim D'Urban Jackson | School of Ocean Sciences | Bangor University

 

JULY

Bild Julia.klein                                                                            YouTube

Contrasting responses of the coral Acropora tenuis to moderate and strong light limitation in coastal waters

Dr. Julia Strahl | Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg

 

JUNE

Tom Bridge

Revising coral systematics and biogeography, and why it matters for coral reef conservation

Dr. Tom Bridge | Senior Research Fellow, ARC Centre of Excellence for Coral Reef Studies, James Cook University

Recording can be available upon request

 

MAY

 Mikhail Matz                                                                                    YouTube

Estimating the potential for coral adaptation to global warming in the Indo-West-Pacific

Professor Mikhail Matz | Matz Lab | Department of Integrative Biology | The University of Texas at Austin