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Littérature scientifique sur le sujet « Amphibolis antarctica »

Auteur : Grafiati
Publié le 23 janvier 2024
Mis à jour le 19 décembre 2024

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Articles de revues sur le sujet "Amphibolis antarctica"

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Verduin, Jennifer J., Anke Seidlitz, Mike van Keulen et Erik I. Paling. « Maximising establishment success of Amphibolis antarctica seedlings ». Journal of Experimental Marine Biology and Ecology 449 (novembre 2013) : 57–60. http://dx.doi.org/10.1016/j.jembe.2013.08.016.

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Waycott, Michelle, Diana I. Walker et Sidney H. James. « Genetic uniformity in Amphibolis antarctica, a dioecious seagrass ». Heredity 76, no 6 (juin 1996) : 578–85. http://dx.doi.org/10.1038/hdy.1996.83.

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Rifai, Husen, Firman Zulpikar, Muhammad Safaat, Jeverson Renyaan, Laode Alifatri et Asep Rasyidin. « Responses of Seagrass Amphibolis antarctica Roots to Nutrient Additions Along a Salinity Gradient in Shark Bay, Western Australia ». Omni-Akuatika 17, no 2 (1 décembre 2021) : 90. http://dx.doi.org/10.20884/1.oa.2021.17.2.913.

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Seagrass meadows in oligotrophic environments are particularly susceptible to nutrient enrichment, yet morphological and architectural seagrass root responses in these ecosystems are poorly understood. This study aimed to investigate the response of Amphibolis antarctica, one of dominant seagrass species in Shark Bay, roots to nutrient additions along a salinity gradient in the oligotrophic ecosystem of Shark Bay, Western Australia. A fully factorial nutrient additional experiment with four treatments (Control, N, P and N+P) was conducted at each of five sites along a salinity gradient (between ~38ppt in site 1 and ~50ppt in site 5) in Shark Bay across a three-year period (2012-2015). In the laboratory, the roots morphology and architecture A. antarctica were investigated using a software (WinRhizo). Then, a two-way analysis of variance (ANOVA) was performed to investigate if there was a significant change in the morphology and architecture of the roots after the nutrient inputs and along five sites with salinity gradient. There was no significant impact of nutrient addition on the root’s morphology and architecture of A. antarctica species. However, the effect of site factor with salinity gradient was significant to all morphological aspects (total root length, root surface area and root diameter) of A. antarctica roots. These findings highlight the more ecological function of A. antarctica roots being in anchoring of the plant into the seafloor rather than to absorb nutrient from the sediment.Keywords: Nutrient addition, Oligotrophic habitats, Amphibolis antarctica, Shark Bay
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Pedersen, Morten F., Eric I. Paling et Diana I. Walker. « Nitrogen uptake and allocation in the seagrass Amphibolis antarctica ». Aquatic Botany 56, no 2 (mars 1997) : 105–17. http://dx.doi.org/10.1016/s0304-3770(96)01100-x.

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van Keulen, Mike. « Multiple climate impacts on seagrass dynamics : Amphibolis antarctica patches at Ningaloo Reef, Western Australia ». Pacific Conservation Biology 25, no 2 (2019) : 211. http://dx.doi.org/10.1071/pc18050.

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The impacts of tropical cyclones combined with a marine heatwave are reported for a seagrass community at Ningaloo Reef, Western Australia. A community of 9.5ha of Amphibolis antarctica was lost following a combination of cyclone-induced burial and a marine heatwave. No new seedlings have been observed since the loss; recruitment of seedlings may be impeded by local ocean circulation.
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Verduin, JJ, DI Walker et J. Kuo. « In situ submarine pollination in the seagrass Amphibolis antarctica : research notes ». Marine Ecology Progress Series 133 (1996) : 307–9. http://dx.doi.org/10.3354/meps133307.

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Tanner, Jason E. « Restoration of the Seagrass Amphibolis antarctica—Temporal Variability and Long-Term Success ». Estuaries and Coasts 38, no 2 (23 mai 2014) : 668–78. http://dx.doi.org/10.1007/s12237-014-9823-4.

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van Dijk, Kor-jent, Gina Digiantonio et Michelle Waycott. « New microsatellite markers for the seagrass Amphibolis antarctica reveal unprecedented genetic diversity ». Aquatic Botany 148 (août 2018) : 25–28. http://dx.doi.org/10.1016/j.aquabot.2018.04.002.

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Bryars, Simon R. « Can regional nutrient status be used to predict plant biomass, canopy structure and epiphyte biomass in the temperate seagrass Amphibolis antarctica ? » Marine and Freshwater Research 60, no 10 (2009) : 1054. http://dx.doi.org/10.1071/mf08194.

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The seagrass Amphibolis antarctica is an important component of coastal soft-sediment ecosystems across southern Australia. Large-scale losses of A. antarctica at several locations have been linked to anthropogenic nutrient inputs. The present study comprised a field survey to test whether the spatial patterns of plant biomass, canopy structure and epiphyte biomass in A. antarctica could be predicted based on expectations related to nutrient status across two regions within Gulf St Vincent, South Australia. Specific predictions were that: (1) plant biomass, plant density, plant height, leaf cluster frequency and leaf frequency are all lower in the east (higher nutrient) region than in the west region; and (2) epiphyte biomass and epiphyte load are higher in the east than in the west. Regional nutrient status was a poor predictor of most of the parameters measured, with the opposite trends to those predicted often occurring. Plant biomass, canopy structure and epiphyte biomass appear to be a result of several site-specific factors that are not fully understood at this time. The results of the present study have significant implications for making generalised predictions and for monitoring A. antarctica on urbanised coasts, and will also be useful for informing ecological studies on plant–epiphyte and plant–animal interactions in A. antarctica ecosystems.
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Walker, D. I., et M. L. Cambridge. « An experimental assessment of the temperature responses of two sympatric seagrasses, Amphibolis antarctica and Amphibolis griffithii, in relation to their biogeography ». Hydrobiologia 302, no 1 (mars 1995) : 63–70. http://dx.doi.org/10.1007/bf00006399.

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Thèses sur le sujet "Amphibolis antarctica"

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Robinson, Jack S. « Assessing the return of carbon sequestration following the restoration/recovery of Amphibolis antarctica and Posidonia sinuosa seagrass in South Australia ». Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2739.

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Occupying < 0.1% of the world’s seafloor, seagrasses provide key ecosystem services including habitat provision underpinning biodiversity, sediment stabilisation, and carbon sequestration. Despite this, seagrasses face significant losses, with an estimated 19% of global seagrass cover lost since the 20th century. Globally, there is an increasing effort to incorporate seagrasses into blue carbon projects through conservation and rehabilitation actions. In Adelaide, South Australia, restoration projects have been conducted using Amphibolis antarctica, with initial results showing the return of structural characteristics comparable to nearby natural meadows. In addition, an unprecedented natural recovery of Posidonia sinuosa has occurred in recent years along the Adelaide coastline. This research assessed the return of carbon sequestration functions and the avoided emissions linked to the restoration of A. antarctica and the recovery of P. sinuosa meadows in Adelaide. Comparisons of organic carbon (Corg) stocks among undisturbed and restored A. antarctica (0.6 ± 0.04 and 1.2 ± 0.4 kg Corg m-2, respectively) and undisturbed and recovering P. sinuosa (1.5 ± 0.4 and 0.5 ± 0.3 kg Corg m-2, respectively) meadows did not clearly show a return of Corg storage within 10-yrs post-recovery. Direct sediment elevation measurements between 2003 and 2019 via sediment elevation rods in P. 47 sinuosa meadows allowed the estimation of sediment and carbon accumulation rates. The rods identified 2 cm of accumulation in the undisturbed site, 20 cm of accumulation post-recovery in the Recovery site, and approximately 32 cm of erosion in the Bare site over 9-years post meadow loss. Based on sediment Corg stocks, the change in elevation across treatments and recent hyperspectral mapping of seagrass along Adelaide’s coastline, we estimated the enhanced sequestration of 231 Mg Corg ha-1 in the recovered meadow between 2011 and 2019, equating to 85,400 ± 6,800 Mg Corg across 876 ha of recovered meadows, while the loss of 188,000 ± 20,500 Mg Corg has occurred from 1406 ha of lost meadows over 9 years. Assuming 50% of this loss was remineralised at a decay rate of 0.0005 yr-1, we estimate 298,500 ± 92,200 Mg CO2-eq emissions from Adelaide’s seagrass loss over a 9-year period. In conclusion, this study is pioneering in demonstrating that the restoration and recovery of seagrasses at scale can lead to large carbon abatement, and thereby supports the development of seagrass rehabilitation in verified carbon crediting schemes. The use of in-situ direct sediment elevation iii measurements, which can be established at the onset of any carbon crediting project, can provide reliable estimates of additionality.
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Redner, Ellen R. « Magma Mixing and Evolution at Minna Bluff, Antarctica Revealed by Amphibole and Clinopyroxene Analyses ». Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1474028057097791.

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Scanlan, Mary K. « Petrology of Inclusion-Rich Lavas at Minna Bluff, McMurdo Sound, Antarctica : Implications for Magma Origin, Differentiation, and Eruption Dynamics ». Bowling Green, Ohio : Bowling Green State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1217952842.

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Beaux, Jean-François. « Le complexe volcano-plutonique de la presqu'île de la société de géographie (Iles Kerguelen) : structure et pétrologie ». Paris 6, 1986. http://www.theses.fr/1986PA066198.

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Le pluton central permet de bien cerner l'évolution et la mise en place de la série alcaline sous-saturée en silice. Ses caractères géochimiques et minéralogiques conduisent à l'expliquer par la cristallisation fractionnée d'un magma fortement alcalin. Des contraintes de fractionnement conduisent à proposer un modèle de deux chambres magmatiques superposées dont le style de mise en place est clairement lie à la différenciation et fait appel aux deux mécanismes reconnus : la subsidence souterraine passive qui guide les intrusions les moins différenciées et le mode en force qui est l'expression des magmas plus évolués et détermine la mise en place de la chambre superficielle.
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Chapitres de livres sur le sujet "Amphibolis antarctica"

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Sengupta, Sudipta. « A Comprehensive Study of the Structural Geology of the Schirmacher Hills ». Dans Geoscientific Investigations From the Indian Antarctic Program, 68–83. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-4078-0.ch003.

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The Precambrian basement of the Schirmacher Hills records multiple episodes of deformation, metamorphism, migmatization, and emplacement of successive generations of mafic and felsic bodies. The earliest tectono-thermal event (D1/M1), preserved in some mafic and ultramafic enclaves, indicates deformation at great crustal depth. The mineralogical assemblage of these enclaves indicates early high temperature (900o C) and high-pressure (10 Kbar) granulite facies conditions. The second tectono-thermal event also showed deformation under granulite facies metamorphism (D2/M2) under 800-850oC and 8 Kbar. The third group of events (D3/M3) is the most dominant in this region and involved deformation under amphibolite facies conditions with synchronous emplacement of granites and mafic dykes and culminated in regional thrusting, producing a regional inversion where the granulates were emplaced over the amphibolite facies rocks. The later events created upright folds and vertical shear zones under amphibolite facies conditions.
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Rao, D. Rameshwar. « Geochemical and Mineralogical Studies of Gneiss-Charnockite Rocks of Schirmacher Region, East Antarctica ». Dans Geoscientific Investigations From the Indian Antarctic Program, 32–67. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-4078-0.ch002.

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The studies of multifaceted problems of gneiss-charnockite rocks in the Schirmacher region of East Antarctica suggest a retrograde clockwise isobaric cooling P-T history of the terrain involving an early granulite phase, a late granulite phase, and a retrograde amphibolite phase metamorphism in the region. Also, a good correlation between fluid and mineral data is observed. The high-density CO2 fluids fall well within the P-T box estimated by mineral thermobarometers, envisaging a pervasive influx of deep-seated CO2 rich fluid from the mantle resulting in the formation of the granulites, followed by decrease CO2 density fluids along with progressive influx of hydrous fluids leading to the generation of retrograde amphibolite facies rocks. The geochemical studies helped trace two-phase evolution of the region (basic magmatism around ~1200 Ma) involving a depleted mantle source implying an accretion of the juvenile crust during the late Mesoproterozoic period and major felsic magmatism around ~880 Ma involving partial melting of mafic-intermediate crust.
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