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Article: Reconstructing Pleistocene Australian herbivore megafauna diet using calcium and strontium isotopes.

Koutamanis, Dafne / McCurry, Matthew / Tacail, Theo / Dosseto, Anthony

2023 Volume 10, Issue 11, Page(s) 230991

Abstract: Isotopes in fossil tooth enamel provide robust tools for reconstructing food webs, which have been understudied in Australian megafauna. To delineate the isotopic composition of primary consumers and understand dietary behaviour at the base of the food ... ...

Abstract	Isotopes in fossil tooth enamel provide robust tools for reconstructing food webs, which have been understudied in Australian megafauna. To delineate the isotopic composition of primary consumers and understand dietary behaviour at the base of the food web, we investigate calcium (Ca) and strontium (Sr) isotope compositions of Pleistocene marsupial herbivores from Wellington Caves and Bingara (New South Wales, Australia). Sr isotopes suggest small home ranges across giant and smaller marsupial herbivores. Ca isotopes in Pleistocene marsupial herbivores cover the same range as those in modern wombats and placental herbivores. Early forming teeth are depleted in heavy Ca isotopes compared to late-forming teeth of a given individual, suggesting a weaning signal. Distinct Ca compositions between taxa can be interpreted as dietary niches. Some niches conform to previous dietary reconstructions of taxa, while others provide new insights into niche differentiation across Australian herbivores. Combined with the small roaming ranges suggested by Sr isotopes, the Ca isotope niche diversity suggests rich ecosystems, supporting a diversity of taxa with various diets in a small area.
Language	English
Publishing date	2023-11-22
Publishing country	England
Document type	Journal Article
ZDB-ID	2787755-3
ISSN	2054-5703
ISSN	2054-5703
DOI	10.1098/rsos.230991
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: A strontium isoscape of northern Australia

Caritat, Patrice / Dosseto, Anthony / Dux, Florian

eISSN: 1866-3516

2023

Abstract: Strontium isotopes ( 87 Sr / 86 Sr) are useful in the Earth sciences as well as in forensic, archaeological, palaeontological, and ecological sciences. As very few large-scale Sr isoscapes exist in Australia, we have identified an opportunity to ... ...

Abstract	Strontium isotopes ( 87 Sr / 86 Sr) are useful in the Earth sciences as well as in forensic, archaeological, palaeontological, and ecological sciences. As very few large-scale Sr isoscapes exist in Australia, we have identified an opportunity to determine 87 Sr / 86 Sr ratios on archive fluvial sediment samples from the low-density National Geochemical Survey of Australia ( www.ga.gov.au/ngsa last access: 15 December 2022). The present study targeted the northern parts of Western Australia, the Northern Territory and Queensland, north of 21.5° S. The samples were taken mostly from a depth of ~60–80 cm in floodplain deposits at or near the outlet of large catchments (drainage basins). A coarse (< 2 mm) grain-size fraction was air-dried, sieved, milled then digested (hydrofluoric acid + nitric acid followed by aqua regia) to release total Sr. The Sr was then separated by chromatography and the 87 Sr / 86 Sr ratio determined by multicollector-inductively coupled plasma mass spectrometry. Preliminary results demonstrate a wide range of Sr isotopic values (0.7048 to 1.0330) over the survey area, reflecting a large diversity of source rock lithologies, geological processes and bedrock ages. Spatial distribution of 87 Sr / 86 Sr shows coherent (multi-point anomalies and smooth gradients), large-scale (> 100 km) patterns that appear to be broadly consistent with surface geology, regolith/soil type, and/or nearby outcropping bedrock. For instance, the extensive black clay soils of the Barkly Tableland define a > 500 km-long northwest-southeast-trending unradiogenic anomaly ( 87 Sr / 86 Sr < 0.7182). Where carbonate or mafic igneous rocks dominate, a low to moderate Sr isotope signature is observed. In proximity to the outcropping Proterozoic metamorphic basement of the Tennant, McArthur, Murphy and Mount Isa geological regions, conversely, radiogenic 87 Sr / 86 Sr values (> 0.7655) are observed. A potential correlation between mineralisation and elevated 87 Sr / 86 Sr values in these regions needs to be ...
Subject code	333
Language	English
Publishing date	2023-01-16
Publishing country	de
Document type	Book ; Online
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Article ; Online: Boron isotopes and FTIR spectroscopy to identify past high severity fires

Ryan, Rebecca / Dosseto, Anthony / Lemarchand, Damien / Dlapa, Pavel / Thomas, Zoë / Šimkovic, Ivan / Bradstock, Ross

Catena. 2023 Mar., v. 222 p.106887-

2023

Abstract: Bushfires have played a crucial role in shaping the landscape and biodiversity for millennia. As fire regimes continue to alter with climate change, greater understanding becomes critical in mediating future events. Existing records are largely ... ...

Abstract	Bushfires have played a crucial role in shaping the landscape and biodiversity for millennia. As fire regimes continue to alter with climate change, greater understanding becomes critical in mediating future events. Existing records are largely historically limited or do not accurately identify fire severity; therefore, there is a need to develop new proxies that can extend our fire records significantly. Here, we test whether changes in carbon (C) and nitrogen (N) content, boron (B) isotopes and Fourier Transform Infrared (FTIR) spectra in sediment deposits can identify past fire events. To achieve this, we investigated sediments deposited in small order creek beds of the Upper Nepean Catchment in southeastern Australia. In each deposit, layers associated with past fire events were independently identified based on visual inspection of higher charcoal abundance. Radiocarbon dating of charcoal fragments was used to approximate the age of the fire events. Neither C and N abundances nor C/N ratios show association with charcoal-rich layers, suggesting they are not useful proxies to identify past fires. Conversely, FTIR spectra show increased aromatic/aliphatic ratios in sediment layers recording past fire events. This observation suggests that those fires were hot enough to reduce long-chain aliphatic compounds to more temperature- and decomposition-resistant aromatics. In each deposit, an increase in δ¹¹B by 2–7 ‰ is associated with charcoal-rich sediment layers. Leaves and fine branches, which burn only during high severity fires, are enriched in ¹¹B, possibly causing the increase in the δ¹¹B value of the sediment clay size fraction. These results suggest that, even in these small order creek beds which are typically transient environments, both FTIR spectra and B isotopes are potentially useful proxies to identify past fire events.
Keywords	Fourier transform infrared spectroscopy ; aromatic compounds ; biodiversity ; boron ; carbon radioisotopes ; catenas ; charcoal ; clay ; climate change ; fire severity ; landscapes ; nitrogen ; sediments ; streams ; watersheds ; Australia ; Isotopes ; FTIR Spectroscopy ; Radiocarbon ; Bushfires
Language	English
Dates of publication	2023-03
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	519608-5
ISSN	1872-6887 ; 0008-7769 ; 0341-8162
ISSN (online)	1872-6887 ; 0008-7769
ISSN	0341-8162
DOI	10.1016/j.catena.2022.106887
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Book ; Online: A strontium isoscape of inland southeastern Australia

Caritat, Patrice / Dosseto, Anthony / Dux, Florian

eISSN: 1866-3516

2022

Abstract: The values and distribution patterns of the strontium (Sr) isotope ratio 87 Sr / 86 Sr in Earth surface materials is of use in the geological, environmental and social sciences. Ultimately, the 87 Sr / 86 Sr ratio of soil and everything that lives in and ...

Abstract	The values and distribution patterns of the strontium (Sr) isotope ratio 87 Sr / 86 Sr in Earth surface materials is of use in the geological, environmental and social sciences. Ultimately, the 87 Sr / 86 Sr ratio of soil and everything that lives in and on it is inherited from the rock that is its parent material. In Australia, there are few large-scale surveys of 87 Sr / 86 Sr available, and here we report on a new, low-density dataset using 112 catchment outlet (floodplain) sediment samples covering 529,000 km 2 of inland southeastern Australia (South Australia, New South Wales, Victoria). The coarse (< 2 mm) fraction of bottom sediment samples (depth ~0.6–0.8 m) from the National Geochemical Survey of Australia were milled and fully digested before Sr separation by chromatography and 87 Sr / 86 Sr determination by multicollector-inductively coupled plasma-mass spectrometry. The results show a wide range of 87 Sr / 86 Sr values from a minimum of 0.7089 to a maximum of 0.7511 (range 0.0422). The median 87 Sr / 86 Sr (± robust standard deviation) is 0.7199 (± 0.0112), and the mean (± standard deviation) is 0.7220 (± 0.0106). The spatial patterns of the Sr isoscape observed are described and attributed to various geological sources and processes. Of note are the elevated (radiogenic) values (≥~0.7270; top quartile) contributed by (1) the Palaeozoic sedimentary country rock and (mostly felsic) igneous intrusions of the Lachlan geological region to the east of the study area; (2) the Palaeoproterozoic metamorphic rocks of the central Broken Hill region; both these sources contribute radiogenic material mainly by fluvial processes; and (3) the Proterozoic to Palaeozoic rocks of the Kanmantoo, Adelaide, Gawler and Painter geological regions to the west of the area; these sources contribute radiogenic material mainly by aeolian processes. Regions of low 87 Sr / 86 Sr (≤~0.7130; bottom quartile) belong mainly to (1) a few central Murray Basin catchments; (2) some Darling Basin catchments in the northeast; and (3) a few Eromanga geological region-influenced catchments in the northwest of the study area; these sources contribute radiogenic material mainly by fluvial processes.
Subject code	333
Language	English
Publishing date	2022-04-27
Publishing country	de
Document type	Book ; Online
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Article: Investigating boron isotopes and FTIR as proxies for bushfire severity

Lu, Shawn / Dosseto, Anthony / Lemarchand, Damien / Dlapa, Pavel / Simkovic, Ivan / Bradstock, Ross

Catena. 2022 Dec., v. 219

2022

Abstract: Bushfire occurrences will likely be exacerbated by climate change, thus requiring a model to forecast and manage their impacts. However, a robust bushfire model requires new proxies that can infer fire severity responses to past climate variability. A ... ...

Abstract	Bushfire occurrences will likely be exacerbated by climate change, thus requiring a model to forecast and manage their impacts. However, a robust bushfire model requires new proxies that can infer fire severity responses to past climate variability. A key test to the viability of new fire proxies is whether they record fire severity in the affected soil. We address this by testing Attenuated Total Reflectance- Fourier Transform Infrared (ATR-FTIR) spectroscopy and boron (B) isotopes in soil clay fractions from Yengo National Park, southeastern Australia, as proxies for bushfire severity. The isotopic results were also compared to that of clays that reacted with experimentally combusted bark. ATR-FTIR spectroscopy constrains the soil temperature to between 225 and 500 °C during high severity fires, based on the lack of dehydroxylation peak characteristics and the increased aromatic to aliphatic organic peak ratios in clays, compared to that of low severity sites. The isotope composition of the non-exchangeable B fraction in clays is lighter after reacting with leaching solutions of bark combusted at higher temperatures. Combustion temperature does not affect the B isotope fractionation during B adsorption onto clays. Changes to the B isotope composition of clays could instead be justified by the varying B concentration and B isotope compositions of the leaching solutions. In Yengo soil clay fractions, sites that experienced a high severity fire show higher δ¹¹B values by about 1.5 ‰, compared to low severity sites- at odds with observations from our experiment using combusted bark. The combustion of leaves from tree crowns in high severity fires could account for the increase in δ¹¹B of clays post-fire. In summary, FTIR spectroscopy of clays could be useful for constraining soil temperature during bushfires, while the B isotope composition of clays appears as a promising proxy for fire severity.
Keywords	Fourier transform infrared spectroscopy ; adsorption ; bark ; boron ; catenas ; clay ; climate ; climate change ; combustion ; fire severity ; isotope fractionation ; isotopes ; models ; national parks ; soil temperature ; trees ; viability ; Australia
Language	English
Dates of publication	2022-12
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	519608-5
ISSN	1872-6887 ; 0008-7769 ; 0341-8162
ISSN (online)	1872-6887 ; 0008-7769
ISSN	0341-8162
DOI	10.1016/j.catena.2022.106621
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: From direct to indirect lithium targets: a comprehensive review of omics data.

Roux, Magali / Dosseto, Anthony

Metallomics : integrated biometal science

2017 Volume 9, Issue 10, Page(s) 1326–1351

Abstract: Metal ions are critical to a wide range of biological processes. Among them, lithium (Li) has been recognised for its benefit as a treatment for bipolar disorder (BD). However, we are yet to grasp the extent of its role in biological processes, despite ... ...

Abstract	Metal ions are critical to a wide range of biological processes. Among them, lithium (Li) has been recognised for its benefit as a treatment for bipolar disorder (BD). However, we are yet to grasp the extent of its role in biological processes, despite its molecular targets having been extensively studied. Here we review a wide range of transcriptomic, proteomic and metabolomic studies in order to obtain a full picture of Li effects at various levels. Multifarious patterns of Li-regulated genes, proteins and metabolites are identified. Some of these patterns are explained as the outcomes of individual Li targets. For instance, Li inhibition of GSK-3 has a wide range of effects: axis development in embryos; cell and tissue differentiation, in particular neurogenesis and osteogenesis; or control of apoptosis. This results in neuroprotection and an attenuation of cognitive deficits. Lithium plays an important role in mitochondrial function, which it improves via its role in phospholipid metabolism and inositol depletion. This is also seen in metabolomics, where its role in the mitochondrial respiratory chain influences energy production and oxidative stress. Lithium also affects the proteins involved in the processing of APP, thus highlighting a possible involvement in Alzheimer's disease. Finally, Li also impacts lipid homeostasis, with studies showing that environmental exposure can impact lipid transport and prostaglandin synthesis. It is seldom possible to establish a causal relationship between Li targets at the molecular level and the resulting effects at the system level. For example, Li effects on adenylate cyclase regulation are not easily linked to any omic pattern despite the importance of the adenylate pathway. Nevertheless, refining our knowledge on the cellular functions of individual Li targets would improve our understanding and interpretation of omics data. This review demonstrates that Li is key to a wide range of processes at all levels, from neuroprotection to oxidative stress and energy production. A corollary of this work is the need for an increased awareness of environmental issues related to Li industrial wastes, in particular considering the widespread use of this metal in our modern society.
MeSH term(s)	Humans ; Lithium Compounds/adverse effects ; Lithium Compounds/therapeutic use ; Metabolome/drug effects ; Neurodegenerative Diseases/drug therapy ; Neurodegenerative Diseases/genetics ; Neurodegenerative Diseases/metabolism ; Neurodegenerative Diseases/pathology ; Proteome/drug effects ; Transcriptome/drug effects
Chemical Substances	Lithium Compounds ; Proteome
Language	English
Publishing date	2017-09-08
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	2474317-3
ISSN	1756-591X ; 1756-5901
ISSN (online)	1756-591X
ISSN	1756-5901
DOI	10.1039/c7mt00203c
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Article ; Online: Calcium isotopes as a biomarker for vascular calcification in chronic kidney disease.

Dosseto, Anthony / Lambert, Kelly / Cheikh Hassan, Hicham I / Fuller, Andrew / Borst, Addison / Dux, Florian / Lonergan, Maureen / Tacail, Theo

Metallomics : integrated biometal science

2023 Volume 15, Issue 3

Abstract: Calcium balance is abnormal in adults with chronic kidney disease (CKD) and is associated with the development of vascular calcification. It is currently not routine to screen for vascular calcification in CKD patients. In this cross-sectional study, we ... ...

Abstract	Calcium balance is abnormal in adults with chronic kidney disease (CKD) and is associated with the development of vascular calcification. It is currently not routine to screen for vascular calcification in CKD patients. In this cross-sectional study, we investigate whether the ratio of naturally occurring calcium (Ca) isotopes, 44Ca and 42Ca, in serum could be used as a noninvasive marker of vascular calcification in CKD. We recruited 78 participants from a tertiary hospital renal center: 28 controls, 9 subjects with mild-moderate CKD, 22 undertaking dialysis and 19 who received a kidney transplant. For each participant, systolic blood pressure, ankle brachial index, pulse wave velocity, and estimated glomerular filtration rate were measured, along with serum markers. Calcium concentrations and isotope ratios were measured in urine and serum. While we found no significant association between urine Ca isotope composition (noted δ44/42Ca) between the different groups, δ44/42Ca values in serum were significantly different between healthy controls, subjects with mild-moderate CKD and those undertaking dialysis (P < 0.01). Receiver operative characteristic curve analysis shows that the diagnostic utility of serum δ44/42Ca for detecting medial artery calcification is very good (AUC = 0.818, sensitivity 81.8% and specificity 77.3%, P < 0.01), and performs better than existing biomarkers. Although our results will need to be verified in prospective studies across different institutions, serum δ44/42Ca has the potential to be used as an early screening test for vascular calcification.
MeSH term(s)	Adult ; Humans ; Calcium ; Calcium Isotopes ; Prospective Studies ; Pulse Wave Analysis ; Cross-Sectional Studies ; Renal Insufficiency, Chronic/complications ; Vascular Calcification/complications ; Vascular Calcification/prevention & control ; Biomarkers
Chemical Substances	Calcium (SY7Q814VUP) ; Calcium Isotopes ; Biomarkers
Language	English
Publishing date	2023-02-20
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2474317-3
ISSN	1756-591X ; 1756-5901
ISSN (online)	1756-591X
ISSN	1756-5901
DOI	10.1093/mtomcs/mfad009
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Article: The erosion response to Quaternary climate change quantified using uranium isotopes and in situ-produced cosmogenic nuclides

Dosseto, Anthony / Mirjam Schaller

Earth-science reviews. 2016 Apr., v. 155

2016

Abstract: Studying how catchment erosion has responded to past climate change can help us better understand not only how landscape evolution operates, but also predict the consequences of future climate change on soil resource availability. Recent years have seen ... ...

Abstract	Studying how catchment erosion has responded to past climate change can help us better understand not only how landscape evolution operates, but also predict the consequences of future climate change on soil resource availability. Recent years have seen the development of tools that allow a quantitative assessment of past changes in catchment erosion. This work reviews the principles of the application of in situ-produced cosmogenic nuclides and uranium isotopes to quantifying past erosion rates. Results highlight the role of periglacial processes and mass wasting in dictating how catchment erosion responds to climatic variability at the 10-kyr scale. At the million-year scale, it is more difficult to untangle the role of climate and tectonics. A strong coupling exists at the 10-kyr to 100-kyr scales between climatic cycles and the transfer time of regolith from source to sink. This coupling reflects changes in sediment source that are either set by changes in vegetation cover at the catchment scale, or by the storage of sediments on continental shelves, at a larger scale. Although further analytical developments are required for these tools to reach their full potential, existing works suggest that in the near future, they will provide unprecedented quantitative insights on how soil and fluvial systems adapt to external perturbations (climatic, tectonic and/or anthropic).
Keywords	climate ; climate change ; isotopes ; landscapes ; nuclides ; regolith ; sediments ; soil ; tectonics ; uranium ; vegetation cover ; watersheds
Language	English
Dates of publication	2016-04
Size	p. 60-81.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1792-9
ISSN	0012-8252
ISSN	0012-8252
DOI	10.1016/j.earscirev.2016.01.015
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Thresholds for the presence of glacial megafauna in central Europe during the last 60,000 years.

Sirocko, Frank / Albert, Johannes / Britzius, Sarah / Dreher, Frank / Martínez-García, Alfredo / Dosseto, Anthony / Burger, Joachim / Terberger, Thomas / Haug, Gerald

Scientific reports

2022 Volume 12, Issue 1, Page(s) 20055

Abstract: Lake sediment records from Holzmaar and the infilled maar of Auel (Eifel, Germany) are used to reconstruct landscape changes and megafauna abundances. Our data document a forested landscape from 60,000 to 48,000 yr b2k and a stepwise vegetation change ... ...

Abstract	Lake sediment records from Holzmaar and the infilled maar of Auel (Eifel, Germany) are used to reconstruct landscape changes and megafauna abundances. Our data document a forested landscape from 60,000 to 48,000 yr b2k and a stepwise vegetation change towards a glacial desert after 26,000 yr b2k. The Eifel landscape was continuously inhabited from 48,000 to 9000 yr b2k by large mammals, documented by the presence of spores of coprophilous fungi from Sordaria and Sporormiella fungi that grow on fecal remains of the megafauna. Megafauna reached higher numbers during cold stadial climates but was present also during the warmer interstadials. Highest abundance was at 56,500/48,500/38,500/33,000/27,000/21,000/16,200/14,000 yr b2k, i.e. under different climate regimes. Some of these dates were associated with clear human presence, which indicates that megafauna was not overkilled by humans. In contrast, human presence could quite likely have been stimulated by the abundant food supply. Megafauna presence decreased significantly when tree abundance increased during interstadials. The Megafauna disappeared finally at 11,400 yr b2k with the development of the early Holocene forest cover, which appears to be the most important threshold for megafauna presence.
MeSH term(s)	Animals ; Humans ; Europe ; Climate ; Trees ; Forests ; Mammals
Language	English
Publishing date	2022-11-21
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-022-22464-x
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Article ; Online: Determination of magnesium isotopic ratios of biological reference materials via multi-collector inductively coupled plasma mass spectrometry.

Le Goff, Samuel / Albalat, Emmanuelle / Dosseto, Anthony / Godin, Jean-Philippe / Balter, Vincent

Rapid communications in mass spectrometry : RCM

2020 Volume 35, Issue 10, Page(s) e9074

Abstract: Rationale: Despite a wide range of potential applications, magnesium (Mg) isotope composition has been so far sparsely measured in reference materials with a biological matrix, which is important for the quality control of the results. We describe a ... ...

Abstract	Rationale: Despite a wide range of potential applications, magnesium (Mg) isotope composition has been so far sparsely measured in reference materials with a biological matrix, which is important for the quality control of the results. We describe a method enabling the chemical separation of Mg in geological and biological materials and the determination of its stable isotope composition. Methods: Different geological (BHVO-1, BHVO-2, BCR-1, and IAPSO) and biological (SRM-1577c, BCR-383, BCR380R, ERM-CE464, DORM-2, DORM-4, TORT-3, and FBS) reference materials were used to test the performance of a new sample preparation procedure for Mg isotopic analysis. The procedure consisted of a simple three-stage elution method to separate Mg from the matrix. Mg isotopic analyses were performed in two different laboratories and with three different multi-collector inductively coupled plasma mass spectrometry instruments. Results: The biological reference materials show a wide range of δ Conclusions: This study indicates that isotopic measurements of Mg in biological reference materials show good performance, with the results being within the accepted range. We confirmed that δ
MeSH term(s)	Animals ; Cattle ; Isotopes/analysis ; Liver/chemistry ; Magnesium/analysis ; Mass Spectrometry/methods ; Meat/analysis ; Tuna
Chemical Substances	Isotopes ; Magnesium (I38ZP9992A)
Language	English
Publishing date	2020-11-05
Publishing country	England
Document type	Evaluation Study ; Journal Article
ZDB-ID	58731-x
ISSN	1097-0231 ; 0951-4198
ISSN (online)	1097-0231
ISSN	0951-4198
DOI	10.1002/rcm.9074
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