ORCID Profile
0000-0001-7351-3083
Current Organisation
CSIRO
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Geophysics | Geophysical Fluid Dynamics | Geodynamics | Electrical and Electromagnetic Methods in Geophysics
Expanding Knowledge in the Earth Sciences | Expanding Knowledge in Engineering |
Publisher: Society of Exploration Geophysicists
Date: 2016
Abstract: A novel wave-mechanics approach is developed specifically for understanding instabilities that form large natural fluid-transmissivity networks in unconventional reservoirs located in a nominally impermeable matrix. These natural flow networks are trapped in the ductile equivalent of brittle faults characterized by the solid-mechanical Arthur-Vardoulakis angle. The main mechanism for ductile deformation and in situ fluid generation is identified to be a chemical reaction such as diagenesis. Diagenesis involves fluid-release mineral reactions of the general type AB solid ⇄ A solid + B fluid and switches on suddenly in the diagenetic window between 100°C and 200°C. Diagenetic reactions often relate to dewatering reactions of phyllosilicates and can involve concentrations of smectite, aqueous silica compound, illite, potassium ions, quartz, feldspar, goethite, hematite, pyrite, calcite, kaolinite, organic matter, water, and gas. In classical petroleum engineering, such interlayer water/gas release reactions are considered to cause cementation and significantly reduce porosity and permeability. However, if a tectonic load is applied, there are critical loading conditions in which the inverse dissolution reaction can form fluid-channeling instabilities. This new wave-mechanics approach might assist in the next paradigm shift for exploration, production, and flow assurance of unconventional gas and oil, underpinned by a better understanding of significant instabilities from volumetric deformation controlled by diagenetic reactions.
Publisher: MDPI AG
Date: 22-09-2016
DOI: 10.3390/MATH4040057
Publisher: Springer Science and Business Media LLC
Date: 08-08-2015
Publisher: IEEE
Date: 12-2010
Publisher: Elsevier BV
Date: 03-2010
Publisher: Springer Science and Business Media LLC
Date: 30-01-2015
Publisher: Springer Science and Business Media LLC
Date: 07-08-2022
DOI: 10.1007/S00603-022-02963-Z
Abstract: Carbonate sediments play a prominent role on the global geological stage as they store more than $$60\\%$$ 60 % of world’s oil and $$40\\%$$ 40 % of world’s gas reserves. Prediction of the deformation and failure of porous carbonates is, therefore, essential to minimise reservoir compaction, fault reactivation, or wellbore instability. This relies on our understanding of the mechanisms underlying the observed inelastic response to fluid injection or deviatoric stress perturbations. Understanding the impact of deformation/failure on the hydraulic properties of the rock is also essential as injection roduction rates will be affected. In this work, we present new experimental results from triaxial deformation experiments carried out to elucidate the behaviour of a porous limestone reservoir analogue (Savonnières limestone). Drained triaxial and isotropic compression tests were conducted at five different confining pressures in dry and water-saturated conditions. Stress–strain data and X-ray tomography images of the rock indicate two distinct types of deformation and failure regimes: at low confinement (10 MPa) brittle failure in the form of dilatant shear banding was dominant whereas at higher confinement compaction bands orthogonal to the maximum principal stress formed. In addition to the pore pressure effect, the presence of water in the pore space significantly weakened the rock, thereby shrinking the yield envelope compared to the dry conditions, and shifted the brittle–ductile transition to lower effective confining pressures (from 35 MPa to 29 MPa). Finally, permeability measurements during deformation show a reduction of an order of magnitude in the ductile regime due to the formation of the compaction bands. These results highlight the importance of considering the role of the saturating fluid in the brittle–ductile response of porous rocks and elucidate some of the microstructural processes taking place during this transition.
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-6520
Abstract: & & Fault and fracture networks can govern fluid flow patterns in the subsurface and predicting fluid flow on a regional scale is of interest in a variety of fields like groundwater management, mining engineering, energy, and mineral resources. Especially the pore fluid pressure can have a strong impact on the strength of fault zones and might be one of the drivers for fault reactivation. Reliable simulations of the transient changes in fluid pressure need to account for the generic architecture of fault zones that comprises strong permeability contrast between the fault core and damage zone.& & & & Particularly, the distribution and connectivity of large-scale fault zones can have a strong impact on the flow field. Yet, modelling numerically such features in their full complexity remains challenging. Often faults zones are conceptualized as forming exclusively either barriers or conduits to fluid flow. However, a generic architecture of fault zones often comprises a discrete fault core surrounded by a diffuse damage zone and conceptualizing large scale discontinuities simply as a barrier or conduit is unlikely to capture the regional scale fluid flow dynamics. It is known that if the fault zone is hosted in low-permeability strata, such as clays or crystalline rocks, a transversal flow barrier can form along the fault core whereas the fracture-rich fault damage zone represents a longitudinal conduit. In more permeable host-rocks (i.e. sandstones or carbonates) the reverse situation can occur, and the permeability distributions in the damage zones can be governed by the abundance of low-permeability deformation features. A reliable numerical model needs to account for the difference and strong contrasts in fluid flow properties of the core and the damage zone, both transversally and longitudinally, in order to make prediction about the regional fluid flow pattern.& & & & Here, we present a numerical method that accounts for the generic fault zone architecture as lower dimensional interfaces in conforming meshes during fluid flow simulations in fault networks. With this method we aim to decipher the impact of fault zone architecture on subsurface flow pattern and fluid pressure evolution in fractures and faulted porous media. The method is implemented in a finite element framework for Multiphysics simulations. We demonstrate the impact of considering the more generic geological structure of in idual faults on the flow field by conceptualizing discontinuities either as barriers, conduits or as a conduit-barrier system and show were these conceptualizations are applicable in natural systems. We further show that a reliable regional scale fluid flow simulation in faulted porous media needs to account for the generic fault zone architecture. The approach is finally used to evaluate the fluid flow response of statistically parameterised faulted media, in order to investigate the impact and sensitivity of each variable parameter.& &
Publisher: Wiley
Date: 27-06-2023
DOI: 10.1111/BRE.12792
Abstract: The permeability of faults and their sedimentary host rocks is a critical input for models of fluid flow in sedimentary basins. Permeability of sedimentary rocks can vary by orders of magnitude over short distances due to variations in sedimentary facies, as well as being strongly anisotropic. Structural features also affect permeability, with faults acting as fluid conduits or barriers depending on the nature of the sedimentary host rock. Constraining these variations in permeability is challenging where outcrops are lacking and drillhole data are sparse. This study describes a workflow using stratigraphic forward modelling to estimate the permeability distribution (both magnitude and anisotropy) in sedimentary rocks and associated faults, which is then used in fluid flow simulations. Permeability is represented as a tensor in the global coordinate system, enabling the use of an unstructured mesh that is independent of stratigraphic layering. The workflow is demonstrated in a sub‐basin of the Proterozoic McArthur Basin of northern Australia. A range of fault permeability scenarios are explored, where fault permeability is a function of host rock properties. The simulation results demonstrate the importance of capturing the direction of permeability anisotropy in dipping strata, as well as highlighting the effect of different fault permeability scenarios. The workflow is particularly well‐suited to scenarios where there are sufficient boreholes to constrain a stratigraphic forward model, but insufficient to determine the permeability distribution by interpolation. Potential applications include mineral and hydrocarbon exploration, groundwater studies, contaminant dispersal modelling, and CO 2 sequestration.
Publisher: Copernicus GmbH
Date: 18-02-2021
Abstract: Abstract. In experiments designed to understand deep shear zones, we show that periodic porous sheets emerge spontaneously during viscous creep and that they facilitate mass transfer. These findings challenge conventional expectations of how viscosity in solid rocks operates and provide quantitative data in favour of an alternative paradigm, that of the dynamic granular fluid pump model. On this basis, we argue that our results warrant a reappraisal of the community's perception of how viscous deformation in rocks proceeds with time and suggest that the general model for deep shear zones should be updated to include creep cavitation. Through our discussion we highlight how the integration of creep cavitation, and its Generalised Thermodynamic paradigm, would be consequential for a range of important solid Earth topics that involve viscosity in Earth materials like, for ex le, slow earthquakes.
Publisher: Cambridge University Press (CUP)
Date: 30-05-2022
DOI: 10.1017/S0016756822000309
Abstract: Faulted and fractured systems form a critical component of fluid flow, especially within low-permeable reservoirs. Therefore, developing suitable methodologies for acquiring structural data and simulating flow through fractured media is vital to improve efficiency and reduce uncertainties in modelling the subsurface. Outcrop analogues provide excellent areas for the analysis and characterization of fractures within the reservoir rocks where subsurface data are limited. Variation in fracture arrangement, distribution and connectivity can be obtained from 2D fractured cliff sections and pavements. These sections can then be used for efficient discretization and homogenization techniques to obtain reliable predictions on permeability distributions in the geothermal reservoirs. Fracture network anisotropy in the Malm reservoir unit is assessed using detailed structural analysis and numerical homogenization of outcrop analogues from an open pit quarry within the Franconian Basin, Germany. Several events are recorded in the fracture networks from the Late Jurassic the Alpine Orogeny and are observed to be influenced by the Kulmbach Fault nearby with a reverse throw of 800 m. The fractured outcrops are digitized for fluid flow simulations and homogenization to determine the permeability tensors of the networks. The tensors show differences in fluid transport direction where fracture permeability is controlled by orientation compared to a constant value. As a result, it is observed that the orientation of the tensor is influenced by the Kulmbach Fault, and therefore faults within the reservoirs at depth should be considered as important controls on the fracture flow of the geothermal system.
Publisher: Wiley
Date: 23-12-2013
DOI: 10.1111/GFL.12012
Publisher: Elsevier BV
Date: 08-2012
Publisher: Springer Science and Business Media LLC
Date: 03-03-2016
Publisher: Springer Nature Switzerland
Date: 13-12-2022
Publisher: Copernicus GmbH
Date: 21-04-2018
Publisher: Springer Science and Business Media LLC
Date: 30-01-2015
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 08-2021
Publisher: Springer Science and Business Media LLC
Date: 04-07-2018
Publisher: American Scientific Publishers
Date: 04-2013
Publisher: Elsevier BV
Date: 09-2015
Publisher: Informa UK Limited
Date: 14-06-2012
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 10-2018
Publisher: Informa UK Limited
Date: 12-2018
Publisher: Springer Science and Business Media LLC
Date: 13-08-2013
Publisher: No publisher found
Date: 2011
Publisher: Springer Science and Business Media LLC
Date: 10-05-2017
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-6577
Abstract: & & The topological and geometrical description of fault and fracture networks is an essential first step in any investigation of fractured or faulted media. The spatial arrangement, density, connectivity, and geometry of the discontinuities strongly impact the physical properties of the media such as resilience and permeability. Obtaining reliable metrics for characterizing fault and fracture networks is of interest for mining engineering, reservoir characterization, groundwater management, and studies on the regional fluid flow history. During large-scale studies, we mostly rely on two-dimensional lineaments obtained through structural mapping, outcrop analysis, or remote sensing. An efficient and widely applicable framework for discontinuity network characterization should therefore be based on the analysis of the frequently available two-dimensional data sets.& & & & Here, we present an automated framework for efficient and robust characterization of the geometric and topologic parameters of discontinuity networks. The geometry of the lineaments is characterised based on orientation, length, and sinuosity. The underlying distribution of these parameters are determined, and representative probability density functions are reported. The connection between the geometric parameters is validated, e.g. correlation between orientation and length. The spatial arrangement is determined by classical line- and window-s ling, by assessing the fractal dimension, and via graph-based topology analysis.& & & & In addition to the statistical analysis of lineament networks, we show how the graph data structure can be utilized for further characterization by linking it to raster data such as magnetic, gravimetric, or elevation. This procedure not only yields an additional means for lineament characterization but also allows users to assess dominant pathways based, for instance, on hydraulic gradients. We demonstrate the applicability of our algorithm on synthetic data sets and real-world case studies on mapped fault and fracture networks.& & & & We finally show how our framework can also be utilized to design detailed numerical studies on the fluid flow properties of analysed networks by conditioning mesh refinement on the type and number of intersections. In addition, due to known scaling relationships our framework can help to determine appropriate parameters for the simulations. We provide ex les of statistically parametrized fluid flow simulations in natural discontinuity networks and show the impact of conceptualizing the lineaments as conduits, barriers or conduit-barrier systems.& &
Publisher: Informa UK Limited
Date: 12-2018
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 08-2012
Publisher: American Geophysical Union (AGU)
Date: 02-2014
DOI: 10.1002/2013JB010701
Publisher: CSIRO
Date: 2022
DOI: 10.25919/1FDE-CY33
Publisher: American Geophysical Union (AGU)
Date: 06-04-2020
DOI: 10.1029/2019GL086172
Publisher: Wiley
Date: 03-08-2021
DOI: 10.1002/NME.6790
Abstract: Under compressive creep, viscoplastic solids experiencing internal mass transfer processes can accommodate singular cnoidal wave solutions as material instabilities at the stationary wave limit. These instabilities appear when the loading rate is significantly faster than the material's capacity to diffusive internal perturbations, leading to localized failure features (e.g., cracks and compaction bands). These cnoidal waves, generally found in fluids, have strong nonlinearities that produce periodic patterns. Due to the singular nature of the solutions, the applicability of the theory is currently limited. Additionally, practical simulation tools require proper regularization to overcome the challenges that singularity induces. We focus on the numerical treatment of the governing equation using a nonlinear approach building on a recent adaptive stabilized finite element method. This automatic refinement method provides an error estimate that drives mesh adaptivity, a crucial feature for the problem at hand. We compare the performance of this adaptive strategy against analytical and standard finite element solutions. We then investigate the sensitivity of the diffusivity ratio, the parameter controlling the process, and identify multiple possible solutions with several stress peaks. Finally, we show the evolution of the spacing between peaks for all solutions as a function of that parameter.
Publisher: Elsevier BV
Date: 05-2021
Publisher: Springer International Publishing
Date: 2017
Publisher: Wiley
Date: 23-10-2015
DOI: 10.1002/NAG.2327
Publisher: Springer International Publishing
Date: 2017
Publisher: CSIRO
Date: 2022
DOI: 10.25919/6QWZ-NH60
Publisher: Elsevier BV
Date: 02-2011
Publisher: Elsevier BV
Date: 03-2017
Publisher: Springer Berlin Heidelberg
Date: 03-12-2013
Publisher: American Geophysical Union (AGU)
Date: 06-2014
DOI: 10.1002/2013JB010070
Publisher: American Geophysical Union (AGU)
Date: 06-2014
DOI: 10.1002/2013JB010071
Publisher: Oxford University Press (OUP)
Date: 14-07-2017
DOI: 10.1093/GJI/GGX295
Publisher: Copernicus GmbH
Date: 19-08-2020
DOI: 10.5194/SE-2020-137
Abstract: Abstract. In experiments designed to understand deep shear zones, we show that periodic porous sheets emerge spontaneously during viscous creep, forming a hydro-mechanical anisotropy that influences mass transfer. These findings challenge the current paradigm of viscosity in solid rocks. In particular, they showcase how shear zones may actively focus mass transport and highlight the possibility that viscous rocks could locally transition from flow to fracture. Our work demonstrates that viscosity in solids is not directly comparable to viscosity in fluids and this is consequential for a range of important solid Earth topics, like slow earthquakes, the flow of glacial ice and the tectonics of exoplanets.
Publisher: Elsevier BV
Date: 2020
Publisher: Oxford University Press (OUP)
Date: 11-07-2022
DOI: 10.1093/GJI/GGAC252
Abstract: A suggested model to explain the episodic nature of slow earthquakes involves shear zones exhibiting rate- and temperature-dependent frictional behaviour hosting fluid-release chemical reactions. In this work we extend the considerations of that approach, coupling the effects of the mechanics at different faulting regimes to the chemically induced fluid pressurization inside the fault. By introducing a pressure and temperature dependence of the mechanical response in an elasto-viscoplastic model we are able to correlate the inclination angles of those specific faults with their dynamical response and enrich their faulting regimes with kinematic characterization. We retrieve that steeply dipping (normal) faults exhibit a simple response of either being locked or slip at fast seismic velocities shallow dipping (reverse) faults on the other hand exhibit a much richer behaviour where episodic stick-slip instabilities can be encountered. When present, their magnitude depends on the (reverse) fault’s angle with faults dipping at around 45° exhibiting a maximum, whereas sub-horizontal thrusts exhibit episodic stick-slip events as low velocities and magnitude. These findings position slow earthquakes and episodic tremor and slip sequences as a natural response of shallow dipping (thrust) faults, in a regime that according to rate-and-state friction considerations is intrinsically stable.
Publisher: Springer Science and Business Media LLC
Date: 28-09-2023
Publisher: Elsevier BV
Date: 12-2022
Publisher: Springer Nature Switzerland
Date: 13-12-2022
Publisher: Copernicus GmbH
Date: 09-12-2020
Publisher: Springer Science and Business Media LLC
Date: 07-08-2017
Publisher: Elsevier BV
Date: 04-2009
Publisher: Springer Berlin Heidelberg
Date: 2009
Publisher: Springer Science and Business Media LLC
Date: 12-02-2012
Publisher: American Geophysical Union (AGU)
Date: 10-09-2020
DOI: 10.1029/2020GL088674
Abstract: Permeability is a critical parameter for geological resources characterization. Its evolution with respect to porosity is particularly interesting and many research initiatives focus on deriving such relationships, to understand some hydraulic impacts of microstructure alteration. Permeability evolution from chemical reactions, for instance, can become complex as flow channels may open during rock dissolution. In this contribution, we show that this phenomenon can lead to irregular porosity‐permeability curves and permeability hysteresis after reprecipitation. Current approaches describing permeability as a simple function of porosity can therefore not capture this behavior, and we advocate instead the use of dynamic modeling for such scenarios. We demonstrate our approach by modeling a dissolution recipitation cycle for a unit cell pore channel and quantify the process at larger scale on three different rock s les, whose microstructures are reconstructed from segmented micro‐Computerised Tomography scans.
Publisher: Informa UK Limited
Date: 17-08-2015
Publisher: Springer Science and Business Media LLC
Date: 07-06-2008
Publisher: Springer Science and Business Media LLC
Date: 05-2015
Publisher: Springer Science and Business Media LLC
Date: 11-2013
Publisher: No publisher found
Date: 2011
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-5250
Abstract: & & We revisit large shear strain deformation experiments on Carrara marble and observe that anisotropic porous domains develop spontaneously during shearing. Specifically, as s les are deformed periodic porous sheets are documented to emerge and are found to transfer mass. These results imply that viscous shear zones may naturally partition fluids into highly anisotropic bands. As this hydro-mechanical anisotropy is produced by creep, each porous sheet is interpreted to represent a transient dynamic pathway for fluid transport. It is unclear how long each porous domain is uniquely sustained but it is clear that sheets are persistently present with increasing strain. Our results forward the idea that viscous shear zones have dynamic transport properties that are not related to fracturing or chemical reaction. We believe these new results provide experimental foundation for changing the paradigm of viscosity in rocks to include dynamic permeability. In our view making this change in perspective could alter many classical interpretations in natural banded mylonite zones, for ex le shear zone parallel syn-kinematic veining may be the result of& ore sheet instability and ductile fracturing.& &
Publisher: CSIRO
Date: 2014
Publisher: Copernicus GmbH
Date: 28-03-2022
DOI: 10.5194/EGUSPHERE-EGU22-11868
Abstract: & & Naturally fractured systems are an important component to fluid flow for a variety of applications, in particular geothermal energy extraction. Geothermal reservoirs often have low rock permeability (e.g. limestone reservoirs) where permeability anisotropy is governed at first order by fractured networks controlled by fracture density, orientation and connectivity. These are often difficult to assess and as such permeability estimates can lead to high uncertainties. Understanding how fracture networks influence permeability of reservoirs is an important aspect to geothermal exploration.& & & & Where subsurface data (e.g. seismic and well) are limited, other data sources for characterising the reservoirs are required. Outcrop analogues are excellent areas for the analysis and characterisation of fractures within the host rocks found at depth. 2D fractured cliff faces and pavements provide information on variation in fracture arrangement, distribution and connectivity which can be utilised in thermohydraulic modelling of the geothermal system.& & & & Through imaging of 2D fractured faces within target reservoir rocks and using efficient discretisation and homogenisation techniques, reliable predictions on permeability distributions in the geothermal reservoirs can be made. Using an ex le from an open pit quarry within the Franconian Basin, Germany, fracture network anisotropy in a geothermal reservoir (Malm) is assessed using detailed structural analysis and numerical homogenisation modelling of outcrop analogues.& & & & Structural analysis shows several events affected the limestone reservoir unit in the area. The first major phase of deformation recorded are steep-angled reverse thrust and strike-slip faulting (stress orientated NNE-SSW) attributed to the Late Cretaceous Inversion. A second deformation phase causing normal faulting and fracturing within a NW-SE stress field is related to the European Cenozoic Rift System (e.g. Eger Rift). The final deformation phase recorded corresponds to the Alpine Orogeny where strike-slip faults and conjugate fractures are formed under a NW-SE compression and NE-SW extension. The faults and fractures are heavily influenced by the Kulmbach Fault, part of the Franconian Lineament Fault System that is observed 10m north of the quarry and active during the multiphase deformation culminating with a reverse throw of 800m.& & & & D imagery is used to capture the fracture networks interpreted through the structural analysis from which different sets of similar fractures are extracted. These are then digitised and meshed for numerical modelling and homogenisation using MOOSE Framework. Three fractured faces are imaged at increasing distance from the Kulmbach Fault to determine the fault impact on the potential flow within the system. The calculated permeability tensors from the homogenisation show differences in fluid transport direction where fracture permeability is controlled by orientation compared to a constant value which would be more pronounced for larger scale simulations. Therefore, for reliable predictions of geothermal flow within the networks, assigning permeabilities for sets is vital. As a result, it is observed that the orientation of the tensor is influenced by the Kulmbach Fault, and thus faults within the reservoirs at depth should be considered as important controls on the fracture flow of the geothermal system.& &
Publisher: Geological Society of London
Date: 2004
Publisher: American Geophysical Union (AGU)
Date: 28-10-2014
DOI: 10.1002/2014GL061715
Publisher: American Scientific Publishers
Date: 09-2013
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: American Geophysical Union (AGU)
Date: 06-2014
DOI: 10.1002/2014JB011004
Publisher: Elsevier BV
Date: 12-2017
Publisher: No publisher found
Date: 2017
Publisher: Wiley
Date: 24-10-2022
DOI: 10.1111/BRE.12723
Abstract: The Hamersley Basin in Western Australia is one of the world's largest iron ore‐producing regions, hosting two types of ore in banded iron formations: the high‐grade martite‐microplaty haematite and the supergene martite‐goethite ores. With the high‐grade ores almost entirely mined in the last decade, the supergene ores have more recently become the dominant resource of interest. Consequently, understanding the genesis of these martite‐goethite deposits is a critical step for exploration. Yet, although various models exist, there is still no consensus on how these mineral resources formed, complicating the prediction of resource volume and location. Here, we show that the paleo‐stratigraphic permeability anisotropy (with higher permeability along strata than across) controls the supergene mimetic enrichment transport process and, subsequently, the mineralisation distribution. We introduce a flow model that implicitly represents strata with a potential function that orients the permeability tensor accurately. The numerical solver uses automatic mesh adaptivity to deliver robust solutions. By accurately reproducing the mineralisation patterns in specific deposits, we identify and quantify the paleo‐water table level and permeability anisotropy ratio as the two main controlling parameters for the mineralisation distribution. These insights provide new timing constraints for the mineralisation and the physical process of iron enrichment, suggesting much more potential mineralisation volume in the paleo‐reconstructed zones than previously anticipated. These flow models allow us to draw geological conclusions with few a priori assumptions required for the genetic model in which the transport component is dominant. The predictive power of this methodology will allow targeted drilling to narrow down the prospective areas and lower exploration costs. Furthermore, the methodology's generality applies to other commodities in sedimentary basins involving supergene processes and will improve our understanding of various genetic models.
Publisher: Elsevier BV
Date: 06-2018
Publisher: Springer International Publishing
Date: 2017
Publisher: Copernicus GmbH
Date: 23-07-2020
Publisher: Copernicus GmbH
Date: 20-10-2020
Publisher: American Geophysical Union (AGU)
Date: 09-04-2011
DOI: 10.1029/2010JB007501
Publisher: Elsevier BV
Date: 10-2011
Publisher: American Geophysical Union (AGU)
Date: 05-2016
DOI: 10.1002/2016JB012801
Publisher: Oxford University Press (OUP)
Date: 11-09-2014
Abstract: A molecular approach was successfully developed to discriminate between spawned eggs of the pelagic carangids Trachurus declivis and Trachurus novaezelandiae collected during ichthyoplankton surveys conducted in October 2002 and 2003 along shelf waters of Queensland (Qld) and New South Wales (NSW), in southeastern Australia (25o50′–37o30′S). Visually identified Trachurus eggs were subjected to mtDNA analysis by targeting specific fragments of the cytochrome oxidase subunit 1 (CO1) and cytochrome b (Cyt b) genes, with three diagnostic sites (single-nucleotide polymorphisms) within a 297 bp segment of Cyt b (558, 588, 825) providing the best approach to discriminate between species. Polymerase chain reaction lification and sequencing of 608 suspected Trachurus eggs resulted in 586 (96.4%) high-quality sequences that unequivocally identified 315 and 207 eggs as T. declivis and T. novaezelandiae, respectively, as well as 18 “variant haplotype” eggs that exhibited a base substitution at one of the diagnostic sites the remaining 46 sequences aligned to three different genera in GenBank including two carangids, thus highlighting the effectiveness of molecular methods for egg identification. Rehydrated, mtDNA-verified eggs of T. declivis were significantly larger (0.97 ± 0.01 mm) than those of T. novaezelandiae (0.82 ± 0.01 mm), though still proved problematic to identify to species when relying on morphology alone. Egg distributions showed main spawning areas of T. declivis and T. novaezelandiae confined mostly to southern NSW (& °S) and northern NSW/southern Qld (& °S), respectively, with T. novaezelandiae likely to continue spawning further south during summer with the gradual temperature increase associated with the south-flowing East Australian Current. Overall findings support the adoption of comparable molecular protocols to verify identification of wild spawned eggs to species level, especially eggs collected during the application of the daily egg production method to estimate spawning biomass of pelagic species, as well as biological fish studies.
Publisher: Springer International Publishing
Date: 2017
Publisher: Elsevier BV
Date: 03-2012
Location: Australia
Start Date: 05-2019
End Date: 12-2023
Amount: $660,000.00
Funder: Australian Research Council
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