ORCID Profile
0000-0001-9646-9070
Current Organisation
Queensland University of Technology
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Palaeoclimatology | Geology | Biomaterials | Polymerisation Mechanisms | Physical Geography and Environmental Geoscience | Inorganic Geochemistry | Sedimentology | Climatology (Incl. Palaeoclimatology) | Geology | Marine Geoscience | Cellular Interactions (incl. Adhesion, Matrix, Cell Wall) | Marine geoscience | Functional Materials | Crop and Pasture Improvement (Selection and Breeding) | Materials Engineering | Metals and Alloy Materials | Microbial genetics | Earth system sciences | Ceramics | Composite and Hybrid Materials |
Ecosystem Adaptation to Climate Change | Climate Variability (excl. Social Impacts) | Climate change | Mineral Resources (excl. Energy Resources) not elsewhere classified | Metal Castings | Expanding Knowledge in the Earth Sciences | Health not elsewhere classified | Ceramics
Publisher: Cambridge University Press (CUP)
Date: 2016
DOI: 10.1016/J.YQRES.2015.11.002
Abstract: The response of platform reefs to sea-level stabilization over the past 6 ka is well established for the Great Barrier Reef (GBR), with reefs typically accreting laterally from windward to leeward. However, these observations are based on few cores spread across reef zones and may not accurately reflect a reef's true accretional response to the Holocene stillstand. We present a new record of reef accretion based on 49 U/Th ages from Heron and One Tree reefs in conjunction with re-analyzed data from 14 reefs across the GBR. We demonstrate that hydrodynamic energy is the main driver of accretional direction exposed reefs accreted primarily lagoon-ward while protected reefs accreted seawards, contrary to the traditional growth model in the GBR. Lateral accretion rates varied from 86.3 m/ka–42.4 m/ka on the exposed One Tree windward reef and 68.35 m/ka–15.7 m/ka on the protected leeward Heron reef, suggesting that wind/wave energy is not a dominant control on lateral accretion rates. This represents the most comprehensive statement of lateral accretion direction and rates from the mid-outer platform reefs of the GBR, confirming great variability in reef flat growth both within and between reef margins over the last 6 ka, and highlighting the need for closely-spaced transects.
Publisher: Elsevier BV
Date: 12-2016
Publisher: Springer Science and Business Media LLC
Date: 05-08-2016
Publisher: Springer Science and Business Media LLC
Date: 06-06-2015
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 08-2017
Publisher: Wiley
Date: 16-08-2021
DOI: 10.1002/DEP2.122
Abstract: The calcareous Halimeda bioherms of the northern Great Barrier Reef, Australia are the largest actively accumulating Halimeda deposits worldwide. They contribute a substantial component of the Great Barrier Reef neritic carbonate factory, as well as the geomorphological development of Australia's northeast continental shelf. Halimeda bioherm geomorphology is complex, expressing three distinct variations in morphotype patterns: annulate, reticulate and undulate. Similar regular and irregular geomorphological patterning often results from scale‐dependent biophysical feedback mechanisms. Therefore, a better understanding of morphotype differentiation can inform the biotic and abiotic drivers of spatial heterogeneity in the bioherm ecosystem. Here, 3D LiDAR bathymetry is integrated with 2D sub‐bottom profile datasets to investigate surface topography and internal sedimentary architecture of Halimeda bioherms through space and time. Using the ESRI ArcGIS 3D Analyst and Benthic Terrain Modeller extensions, the bioherm surface and subsurface geomorphometric characteristics were quantified for the annulate, reticulate and undulate morphotypes. Significant variation was found between the three bioherm morphotypes in their surface topography, internal structure, volume, slope gradients and terrain complexity. Therefore, their geomorphology is probably influenced by differing processes and biophysical feedback mechanisms. The complex surface topography does not appear to be inherited from the antecedent substrate, and preferred aspect orientations resulting from hydrodynamic forcing appear to be limited. It is suggested here that autogenic dynamics or biotic self‐organization similar to patterns and processes in other marine organo‐sedimentary systems modulates Halimeda bioherm geomorphology, and some hypotheses are offered towards future studies. Morphotype differentiation has implications for the development of the Halimeda bioherm carbonate factory, rates of sediment aggradation and progradation, and variable capacity to fill accommodation space. Self‐organization dynamics and morphology differentiation in Modern bioherm systems could potentially inform palaeo‐environmental interpretations of fossil bioherms and phylloid algal mounds on geological timescales.
Publisher: Elsevier BV
Date: 03-2017
Publisher: Informa UK Limited
Date: 10-02-2019
Publisher: American Association for the Advancement of Science (AAAS)
Date: 30-09-2022
Abstract: The geological units on the floor of Jezero crater, Mars, are part of a wider regional stratigraphy of olivine-rich rocks, which extends well beyond the crater. We investigated the petrology of olivine and carbonate-bearing rocks of the Séítah formation in the floor of Jezero. Using multispectral images and x-ray fluorescence data, acquired by the Perseverance rover, we performed a petrographic analysis of the Bastide and Brac outcrops within this unit. We found that these outcrops are composed of igneous rock, moderately altered by aqueous fluid. The igneous rocks are mainly made of coarse-grained olivine, similar to some martian meteorites. We interpret them as an olivine cumulate, formed by settling and enrichment of olivine through multistage cooling of a thick magma body.
Publisher: Mary Ann Liebert Inc
Date: 08-2011
DOI: 10.1089/TEN.TEC.2010.0453
Abstract: For a scaffold material to be considered effective and efficient for tissue engineering, it should be biocompatible and bioinductive. Silk fiber is a natural biocompatible material suitable for scaffold fabrication however, silk is tissue conductive and lacks tissue-inductive properties. One proposed method to make the scaffold tissue inductive is to introduce plasmids or viruses encoding a specific growth factor into the scaffold. In this study, we constructed adenoviruses encoding bone morphogenetic protein-7 (BMP-7) and incorporated these into silk scaffolds. The osteoinductive and new bone formation properties of these constructs were assessed in vivo in a critical-sized skull defect animal model. Silk fibroin scaffolds containing adenovirus particles coding BMP-7 were prepared. The release of the adenovirus particles from the scaffolds was quantified by tissue-culture infective dose (TCID50), and the bioactivity of the released viruses was evaluated on human bone marrow mesenchymal stromal cells (BMSCs). To demonstrate the in vivo bone forming ability of the virus-carrying silk fibroin scaffold, the scaffold constructs were implanted into calvarial defects in SCID mice. In vitro studies demonstrated that the virus-carrying silk fibroin scaffold released virus particles over a 3-week period while preserving their bioactivity. In vivo test of the scaffold constructs in critical-sized skull defect areas revealed that silk scaffolds were capable of delivering the adenovirus encoding BMP-7, resulting in significantly enhanced new bone formation. Silk scaffolds carrying BMP-7 encoding adenoviruses can effectively transfect cells and enhance both in vitro and in vivo osteogenesis. The findings of this study indicate that silk fibroin is a promising biomaterial for gene delivery to repair critical-sized bone defects.
Publisher: American Geophysical Union (AGU)
Date: 04-2019
DOI: 10.1029/2019PA003587
Publisher: American Geophysical Union (AGU)
Date: 08-2017
DOI: 10.1002/2017GC006949
Publisher: Springer Science and Business Media LLC
Date: 27-08-2021
DOI: 10.1038/S43247-021-00257-W
Abstract: Measuring the amount of carbon captured in deep-sea limestones is fundamental to understanding the long-term carbon cycle because pelagic limestones represent Earth’s largest carbon sink since the mid-Mesozoic. However, their contribution to the long-term carbon cycle is poorly quantified. Here, we use X-ray fluorescence and scanning X-ray diffraction microscopy for high-resolution chemical and structural analysis of pelagic limestone from the Paleocene Kaiwhata Formation in New Zealand. We identify densely packed diagenetic micro-dissolution seams that are invisible to light and electron-beam microscopes in most cases. Mass-balance calculations indicate that in idual seams remove ~50% of the calcite mud matrix while their bulk-s le carbon loss adds up to ~10%. The liberated carbon is trapped in situ as calcite cement or returned to the ocean during physical compaction or soft-sediment deformation. We suggest micro-dissolution structures may play an important role in the long-term carbon cycle by modulating carbon exchange between the geosphere and hydrosphere.
Publisher: Springer Science and Business Media LLC
Date: 11-2022
DOI: 10.1038/S41598-022-23134-8
Abstract: Reproductive propagation by asexual fragmentation in the reef-building coral Acropora millepora depends on (1) successful attachment to the reef substrate through modification of soft tissues and (2) a permanent bond with skeletal encrustation. Despite decades of research examining asexual propagation in corals, the initial response, cellular reorganisation, and development leading to fragment substrate attachment via a newly formed skeleton has not been documented in its entirety. Here, we establish the first "coral attachment model" for this species ("Am-CAM") by developing novel methods that allow correlation of fluorescence and electron microscopy image data with in vivo microscopic time-lapse imagery. This multi-scale imaging approach identified three distinct phases involved in asexual propagation: (1) the contact response of the coral fragment when contact with the substrate, followed by (2) fragment stabilisation through anchoring by the soft tissue, and (3) formation of a "lappet-like appendage" structure leading to substrate bonding of the tissue for encrustation through the onset of skeletal calcification. In developing Am-CAM, we provide new biological insights that can enable reef researchers, managers and coral restoration practitioners to begin evaluating attachment effectiveness, which is needed to optimise species-substrate compatibility and achieve effective outplanting.
Publisher: Springer Science and Business Media LLC
Date: 26-10-2201
Publisher: American Geophysical Union (AGU)
Date: 04-2016
DOI: 10.1002/2015PA002898
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 12-2014
Publisher: Springer Science and Business Media LLC
Date: 06-2023
DOI: 10.1007/S12526-023-01348-X
Abstract: Halimeda bioherms on the Northern Great Barrier Reef (GBR) extend for over 6000 km 2 . To explore the ecological and biogeographical importance of these bioherms was one of the aims of a recent voyage on the Research Vessel (RV) Investigator . Through the use of underwater images and habitat s ling, we found populations of Heteropsammia cochlea (Spengler, 1781) living in the bioherms. The scleractinian coral genus Heteropsammia (Dendrophylliidae) is a group of solitary, apozooxanthellate, single-polyp corals with a widespread distribution in tropical and sub-tropical regions. Populations of H. cochlea were observed with in iduals dispersed on open-sand habitat and among patches of Halimeda at 30–40 m water depth in mean densities of 89 and 29 corals per m 2 , respectively. Fluorescence microscopy was used to assess the presence of zooxanthellae, indicating that they are actively photosynthesising at these depths. These are the first observations of H. cochlea in association with the Halimeda bioherms on the Northern GBR.
Publisher: Elsevier BV
Date: 02-2017
Publisher: Springer Science and Business Media LLC
Date: 05-07-2021
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 08-2014
Publisher: SAGE Publications
Date: 26-06-2018
Abstract: A revised Holocene sea-level history for the southern Gulf of Carpentaria is presented based on new data from the South Wellesley Archipelago and age recalibration of previous research. Results confirm that rising sea levels during the most recent post-glacial marine transgression breached the Arafura Sill ca. 11,700 cal. yr BP. Sea levels continued to rise to ca. –30 m by 10,000 cal. yr BP, leading to full marine conditions. By 7700 cal. yr BP, sea-level reached present mean sea-level (PMSL) and continued to rise to an elevation of between 1.5 m and 2 m above PMSL. Sea level remained ca. + 1.5 between 7000 and 4000 cal. yr BP, followed by rapid regression to within ± 0.5 m of PMSL by ca. 3500 cal. yr BP. When placed into a wider regional context results from this study show that coastal landscape evolution in the tropical north of Australia was not only dependent on sea-level change but also show a direct correlation with Holocene climate variability. Specifically, the formation and preservation of beach-rock deposits, intertidal successions, beach and chenier ridge systems hold valuable sea-level and Holocene climate proxies that can contribute to the growing research into lower latitude Holocene sea-level and climate histories.
Publisher: Elsevier BV
Date: 07-2015
Publisher: Cambridge University Press (CUP)
Date: 04-08-2016
DOI: 10.1017/RDC.2016.53
Abstract: Radiocarbon dating of marine s les requires a local marine reservoir correction, or ΔR value, for accurate age calibrations. For the Samoan Archipelago in the central Pacific, ΔR values have been proposed previously, but, unlike some Polynesian archipelagoes, ΔR values seem not to vary spatially and temporally. Here, we demonstrate such variability by reporting a ΔR of –101±72 ΔR for the Manu‘a Group—the eastern-most islands in the archipelago—for the colonization period. This value is based on accelerator mass spectrometry (AMS) 14 C and uranium-thorium (U-Th) series dating of in idual coral branches from pre-2300 cal BP archaeological contexts. This figure differs from the previously proposed modern ΔR of 28±26 yr derived from dated historic, pre-1950, shell s les from the western islands of Samoa. Consequently, we recommend using the ΔR of –101±72 yr for the 1st millennium BC in Manu‘a, and 28±26 yr for calibrating dates within the 2nd millennium AD in the western islands (Savai‘i to Tutuila). Until more data from across the archipelago and from throughout the entire culture-historical sequence document ΔR variability, we recommend that researchers use both of these ΔR values to evaluate how the dates of marine-derived s les compare with AMS dates on identified, short-lived wood charcoal.
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 03-2020
Publisher: Geological Society of America
Date: 2005
DOI: 10.1130/G20932.1
Publisher: SAGE Publications
Date: 30-10-2013
Publisher: Elsevier BV
Date: 10-2017
Publisher: Springer Science and Business Media LLC
Date: 03-11-2018
Publisher: Wiley
Date: 18-07-2012
Publisher: Springer Science and Business Media LLC
Date: 05-12-2007
Publisher: Cambridge University Press (CUP)
Date: 27-07-2018
DOI: 10.1017/RDC.2017.63
Abstract: A robust marine radiocarbon ( 14 C) reservoir correction (ΔR) is essential for calibrating 14 C dates of marine mollusks and fish bones routinely found in archaeological sites as discarded food remains and bones of terrestrial animals (including humans) with an appreciable marine diet. New ΔR values are reported for the atoll archipelago of the Marshall Islands, eastern Micronesia. Atolls consist of biogenetic material—mostly coral and foraminifera—that can be directly dated for establishing sequences of atoll emergence and islet development. After sectioning and examination using scanning electron microscopy (SEM) to screen for s le diagenesis, 6 pristine branch coral s les were selected from the modern oceanside beach, 3 archaeological sites, and islet developmental facies from Ebon Atoll (4º34′N, 168º41′E). Each s le was analyzed by U-series and accelerator mass spectrometry (AMS) 14 C showing no substantial temporal ΔR variations and yielding a weighted mean ΔR of 41±42 yr 1 spanning ~500 yr before earliest human colonization (the period when islets first became habitable) through the entire 2000-yr occupation sequence. Reliable published ΔR values for Micronesia and Δ 14 C data for Palmyra Island, together with our results for Ebon Atoll, indicate that the Pacific North Equatorial Counter Current is almost stable for the past 2500 yr.
Publisher: Geological Society of America
Date: 2007
DOI: 10.1130/G23823A.1
Publisher: Elsevier BV
Date: 08-2019
Publisher: American Geophysical Union (AGU)
Date: 02-2021
DOI: 10.1029/2020PA003871
Abstract: The northern Great Barrier Reef (GBR) Halimeda bioherms have accumulated on the outer continental shelf from calcium carbonate algal sediments over the past ∼10,000 years and cover ,000 km 2 of shelf area. As such, Halimeda bioherms play a key role in the shallow marine carbon cycle over millennial timescales. The main source of nitrogen (N) to these bioherms is thought to be westward transport of upwelled NO 3 ‐ ‐rich water from the Coral Sea. However, the primary N source has not been traced geochemically, and we have no understanding of any temporal variation. Here, we reconstruct patterns of N supply to Halimeda bioherms in the GBR since the mid‐Holocene using the 15 N/ 14 N ratio of skeletal‐bound organic N (δ 15 N‐skeletal organic material [SOM]) in modern and fossil Halimeda sediment cores. Average Halimeda skeletal δ 15 N‐SOM was 6.28 ± 0.26‰, consistent with δ 15 N‐NO 3 ‐ from western tropical South Pacific (WTSP) thermocline waters. Thus, geochemically validating shelf‐break upwelling of an oceanic N source that regulates bioherm spatial distribution. Halimeda δ 15 N‐SOM decreased by 1‰–2‰ from 5,000 to 2,000 cal. yr BP, reaching a minima of 5.5‰ that persisted for almost 1,000 years. The Halimeda δ 15 N‐SOM variation reflects mid‐ to late Holocene changes in regional climate and intensified El Niño activity that likely facilitated elevated N 2 fixation in the WTSP, thereby lowering thermocline δ 15 N‐NO 3 ‐ . Thus, Halimeda skeletal material provides a valuable high‐resolution geochemical archive of past oceanographic and climatic processes over centennial to millennial timescales, complementing existing paleoclimate proxy records.
Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 03-2021
Publisher: Springer Science and Business Media LLC
Date: 25-10-2009
Publisher: Elsevier BV
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 2003
Publisher: Wiley
Date: 13-05-2016
DOI: 10.1111/SED.12266
Publisher: American Geophysical Union (AGU)
Date: 10-2016
DOI: 10.1002/2016PA002943
Publisher: Elsevier BV
Date: 2004
Publisher: Elsevier BV
Date: 11-2007
Publisher: Springer Science and Business Media LLC
Date: 29-11-2009
Publisher: Springer Science and Business Media LLC
Date: 03-2021
Publisher: Wiley
Date: 13-07-2009
Publisher: Elsevier BV
Date: 2018
Start Date: 2011
End Date: 2011
Funder: Australian Research Council
View Funded ActivityStart Date: 2010
End Date: 06-2016
Amount: $120,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2011
End Date: 05-2012
Amount: $720,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2023
End Date: 12-2024
Amount: $4,378,196.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2012
End Date: 11-2018
Amount: $490,000.00
Funder: Australian Research Council
View Funded Activity