https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51298 20%) during a reef-wide bleaching event in February 2020 at Heron Island on the Great Barrier Reef. We found that during this bleaching event, rates of NEP and NEC across replicate transects remained positive and did not change in response to bleaching. Repeated benthic surveys over a period of 20d indicated an increase in the percent area of bleached coral tissue, corroborated by relatively low Symbiodiniaceae densities (1/40.6×106cm-2) and dark-adapted photosynthetic yields in photosystem II of corals (1/40.5) sampled along each transect over this period. Given that a clear decline in coral health was not reflected in the overall NEC estimates, it is possible that elevated temperatures in the water column that compromise coral health enhanced the thermodynamic favorability for calcification in other ahermatypic benthic calcifiers. These data suggest that positive NEC on degraded reefs may not equate to the net positive accretion of a complex, three-dimensional reef structure in a future, warmer ocean. Critically, our study highlights that if coral cover continues to decline as predicted, NEC may no longer be an appropriate proxy for reef growth as the proportion of the NEC signal owed to ahermatypic calcification increases and coral dominance on the reef decreases.]]> Wed 30 Aug 2023 15:01:01 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48723 Wed 29 Mar 2023 16:42:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50197 Wed 06 Mar 2024 14:42:35 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38161 Wed 04 Aug 2021 18:44:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46275 Tue 15 Nov 2022 08:10:33 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41755 86%) significantly decreasing compared to control conditions. Additionally, almost 60% of the coral volatilome (or 52 BVOCs) could be assigned to four key functional groups based on their activities in other species or systems, including stress response, chemical signalling, climate regulation and antimicrobial activity. The total number of compounds assigned to these functions decreased significantly under heat stress for both A. intermedia (by 35%) and P. damicornis (by 64%), with most dramatic losses found for climatically active BVOCs in P. damicornis and antimicrobial BVOCs in A. intermedia. Together, our observations suggest that future heat stress events predicted for coral reefs will reduce the diversity, quantity and functional potential of BVOCs emitted by reef-building corals, potentially further compromising the healthy functioning of these ecosystems]]> Thu 24 Aug 2023 15:48:38 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44049 Thu 16 May 2024 10:49:13 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39732 Thu 16 May 2024 10:47:44 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54032 Mon 29 Jan 2024 13:32:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46613 Cladocopium sp. (syn. clade C3) within the host coral Acropora aspera during exposure to thermal stress. Exposure to temperatures between 2 and 3°C below the bleaching threshold, equating to 2-degree heating weeks (DHWs), results in changes to the symbiont cell morphology and cell division rates. Once corals were exposed to 4 DHWs, over 90% of the symbiont cells showed signs of degradation. Although sub-bleaching thermal stress is not sufficient to trigger bleaching alerts at an ecological scale, this stressor substantially affects the coral symbiosis. It is therefore vital that we begin to quantify how sub-bleaching thermal stress affects the fitness of Symbiodiniacea populations, their coral hosts and subsequently reefs worldwide.]]> Mon 28 Nov 2022 10:36:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51571 Mon 11 Sep 2023 14:37:03 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50226 Mon 10 Jul 2023 11:13:00 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40620 Acropora aspera), we examined the recovery of both coral communities and their dominant species from the 2016 mass bleaching event in the macrotidal Kimberley region, NW Australia. We show that recovery of coral communities inhabiting adjacent but environmentally contrasting reef habitats differed dramatically following unprecedented bleaching in 2016. Both intertidal (thermally extreme) and subtidal (thermally moderate) habitats experienced extensive bleaching (72-81%), but subtidal coral communities had a greater percentage of severely bleached corals than the intertidal community (76 versus 53%). Similarly, subtidal A. aspera corals suffered much greater losses of chlorophyll a than intertidal conspecifics (96 versus 46%). The intertidal coral community fully recovered to its prebleaching configuration within 6 months, whereas the adjacent subtidal suffered extensive mortality (68% loss of live coral cover). Despite the presence of three cryptic genetic lineages in the dominant coral species, the physiological response of A. aspera was independent of host cryptic genetic diversity. Furthermore, both intertidal and subtidal A. aspera harbored symbionts in the genus Cladocopium (previously clade C). Our findings therefore highlight the important role of tidally controlled temperature variability in promoting coral recovery capacity. While the underlying physiological and molecular mechanisms require further investigation, we propose that shallow reef environments characterized by strong environmental gradients may generally promote coral resilience to extreme climatic events. Thermally variable reef environments may therefore provide important spatial refugia for coral reefs under rapid climate change.]]> Fri 22 Jul 2022 15:36:00 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52655 Fri 20 Oct 2023 08:55:33 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52262 Fri 06 Oct 2023 10:25:04 AEDT ]]>