https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.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://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40533 Tue 20 Feb 2024 12:00:49 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34919 Hemiscyllium ocellatum) displayed sinusoidal movement patterns, while Blacktip Reef Sharks (Carcharhinus melanopterus) had more linear trajectories that were similar to those of a Lemon shark (Negaprion acutidens). Individual shark trajectory patterns and movement speeds were highly variable. Results indicate that Epaulette sharks may be more mobile during diurnal low tides than previously thought. The approach presented here allows the movements and behaviours of marine vertebrates to be analysed at resolutions not previously possible without complex and expensive acoustic arrays. This method would be useful to assess the habitat use and behaviours of sharks and rays in shallow water environments, where they are most likely to interact with humans.]]> Tue 03 Sep 2019 17:58:05 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39283 Ostreobium spp., are responding to the skeletal morphology. This study highlights that the structure of a coral's skeleton could be used to predict the biomass of its resident endolithic biofilm.]]> Thu 21 Mar 2024 15:54:14 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44049 Thu 16 May 2024 10:49:13 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48524 Acropora muricata High light (HL)- and low light (LL)-acclimated corals were collected from the reef and reciprocally exposed to high and low light ex situ Rapid light curves using pulse-amplitude modulation (PAM) fluorometry revealed photophysiological acclimation of LL corals to HL and HL corals to LL within 21 days. A subset of colonies sampled at 7 and 21 days for untargeted LC-MS and GC-MS metabolomic profiling revealed metabolic reorganization before acclimation was detected using PAM fluorometry. Metabolomic shifts were more pronounced for LL to HL corals than for their HL to LL counterparts. Compounds driving metabolomic separation between HL-exposed and LL control colonies included amino acids, organic acids, fatty acids and sterols. Reduced glycerol and campesterol suggest decreased translocation of photosynthetic products from symbiont to host in LL to HL corals, with concurrent increases in fatty acid abundance indicating reliance on stored lipids for energy. We discuss how these data provide novel insight into environmental regulation of metabolism and implications for management strategies that drive rapid changes in light availability.]]> Mon 20 Mar 2023 17:56:36 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51386 Mon 04 Sep 2023 13:11:51 AEST ]]>