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Rintoul SR, Chown SL, DeConto RM, England MH, Fricker HA, Masson-Delmotte V, Naish TR, Siegert MJ, Xavier JC. Author Correction: Choosing the future of Antarctica. Nature 2018; 562:E5. [PMID: 30018346 DOI: 10.1038/s41586-018-0369-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
On page 234 of this Perspective, '50% decrease' has been corrected online to '50% increase' in the sentence "The pH of surface waters south of 60° S decreased by 0.2 between 2017 and 2070, equivalent to a 50% increase in the concentration of hydrogen ions since the pre-industrial period1."
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Affiliation(s)
- S R Rintoul
- CSIRO Oceans & Atmosphere, Hobart, Tasmania, Australia. .,Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, Tasmania, Australia. .,Centre for Southern Hemisphere Oceans Research, Hobart, Tasmania, Australia.
| | - S L Chown
- School of Biological Sciences, Monash University, Victoria, Australia
| | - R M DeConto
- University of Massachusetts, Amherst, MA, USA
| | - M H England
- ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, New South Wales, Australia
| | - H A Fricker
- Scripps Institution of Oceanography, La Jolla, CA, USA
| | | | - T R Naish
- Victoria University of Wellington, Wellington, New Zealand
| | - M J Siegert
- Grantham Institute and Department of Earth Science and Engineering, Imperial College London, London, UK
| | - J C Xavier
- Marine and Environmental Science Centre MARE, Department of Life Sciences, University of Coimbra, Coimbra, Portugal.,British Antarctic Survey, Natural Environment Research Council, Cambridge, UK
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Abstract
The phase diagram and the critical behavior of the spin-1 and the spin-3/2 two-dimensional Baxter-Wu model in a crystal field are studied by conventional finite-size scaling and conformal invariance theory. The phase diagram of this model, for the spin-1 case, is qualitatively the same as those of the diluted 4-states Potts model and the spin-1 Blume-Capel model. However, for the present case, instead of a tricritical point one has a pentacritical point for a finite value of the crystal field, in disagreement with previous work based on finite-size calculations. On the other hand, for the spin-3/2 case, the phase diagram is much richer and can present, besides a pentacritical point, an additional multicritical end point. Our results also support that the universality class of the critical behavior of the spin-1 and spin-3/2 Baxter-Wu model in a crystal field is the same as the pure Baxter-Wu model, even at the multicritical points.
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Affiliation(s)
- D A Dias
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Caixa Postal 702, 30123-970 Belo Horizonte, Minas Gerais, Brazil.,Universidade Federal de Uberlândia, Campus Patos de Minas, Av. Getúlio Vargas 230, 38700-103 Patos de Minas, Minas Gerais, Brazil
| | - J C Xavier
- Instituto de Física, Universidade Federal de Uberlândia, Caixa Postal 593, 38400-902 Uberlândia, Minas Gerais, Brazil
| | - J A Plascak
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Caixa Postal 702, 30123-970 Belo Horizonte, Minas Gerais, Brazil.,Universidade Federal da Paraíba, Centro de Ciências Exatas e da Natureza, Campus I, Departamento de Física, CCEN Cidade Universitária, 58051-970 João Pessoa, Paraíba, Brazil.,Center for Simulational Physics, University of Georgia, Athens, Georgia 30602, USA
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Krüger L, Ramos JA, Xavier JC, Grémillet D, González-Solís J, Kolbeinsson Y, Militão T, Navarro J, Petry MV, Phillips RA, Ramírez I, Reyes-González JM, Ryan PG, Sigurðsson IA, Van Sebille E, Wanless RM, Paiva VH. Identification of candidate pelagic marine protected areas through a seabird seasonal-, multispecific- and extinction risk-based approach. Anim Conserv 2017. [DOI: 10.1111/acv.12339] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- L. Krüger
- MARE - Marine and Environmental Science Centre; Department of Life Sciences; University of Coimbra; Coimbra Portugal
- Instituto Nacional de Ciência e Tecnologia Antártico de Pesquisas Ambientais INCT-APA; Rio de Janeiro Brasil
| | - J. A. Ramos
- MARE - Marine and Environmental Science Centre; Department of Life Sciences; University of Coimbra; Coimbra Portugal
| | - J. C. Xavier
- MARE - Marine and Environmental Science Centre; Department of Life Sciences; University of Coimbra; Coimbra Portugal
- British Antarctic Survey; Natural Environment Research Council; Cambridge UK
| | - D. Grémillet
- Centre d'Ecologie Fonctionnelle et Evolutive; UMR 5175; CNRS - Université de Montpellier - Université Paul-Valéry Montpellier - EPHE; Montpellier France
- Percy FitzPatrick Institute of African Ornithology; DST-NRF Centre of Excellence; University of Cape Town; Rondebosch South Africa
| | - J. González-Solís
- Department of Animal Biology and Biodiversity Research Institute (IRBio); Faculty of Biology; University of Barcelona; Barcelona Spain
| | - Y. Kolbeinsson
- Northeast Iceland Nature Research Centre; Húsavík Iceland
| | - T. Militão
- Department of Animal Biology and Biodiversity Research Institute (IRBio); Faculty of Biology; University of Barcelona; Barcelona Spain
| | - J. Navarro
- Centre d'Ecologie Fonctionnelle et Evolutive; UMR 5175; CNRS - Université de Montpellier - Université Paul-Valéry Montpellier - EPHE; Montpellier France
- Conservation Biology Department; Estación Biológica de Doñana; Sevilla Spain
| | - M. V. Petry
- Instituto Nacional de Ciência e Tecnologia Antártico de Pesquisas Ambientais INCT-APA; Rio de Janeiro Brasil
- Laboratório de Ornitologia e Animais Marinhos; Universidade do Vale do Rio dos Sinos; São Leopoldo Brasil
| | - R. A. Phillips
- British Antarctic Survey; Natural Environment Research Council; Cambridge UK
| | - I. Ramírez
- Head of Conservation for Europe and Central Asia; Birdlife International; Cambridge UK
| | - J. M. Reyes-González
- Department of Animal Biology and Biodiversity Research Institute (IRBio); Faculty of Biology; University of Barcelona; Barcelona Spain
| | - P. G. Ryan
- Percy FitzPatrick Institute of African Ornithology; DST-NRF Centre of Excellence; University of Cape Town; Rondebosch South Africa
| | | | - E. Van Sebille
- Grantham Institute & Department of Physics; Imperial College London; London UK
| | - R. M. Wanless
- Percy FitzPatrick Institute of African Ornithology; DST-NRF Centre of Excellence; University of Cape Town; Rondebosch South Africa
- Seabird Conservation Programme; BirdLife South Africa; Johannesburg South Africa
| | - V. H. Paiva
- MARE - Marine and Environmental Science Centre; Department of Life Sciences; University of Coimbra; Coimbra Portugal
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Jiménez S, Domingo A, Brazeiro A, Defeo O, Wood AG, Froy H, Xavier JC, Phillips RA. Sex-related variation in the vulnerability of wandering albatrosses to pelagic longline fleets. Anim Conserv 2015. [DOI: 10.1111/acv.12245] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- S. Jiménez
- Laboratorio de Recursos Pelágicos; Dirección Nacional de Recursos Acuáticos; Montevideo Uruguay
- British Antarctic Survey; Natural Environment Research Council, High Cross; Cambridge UK
| | - A. Domingo
- Laboratorio de Recursos Pelágicos; Dirección Nacional de Recursos Acuáticos; Montevideo Uruguay
| | - A. Brazeiro
- Instituto de Ecología y Ciencias Ambientales; Facultad de Ciencias, Universidad de la República; Montevideo Uruguay
| | - O. Defeo
- UNDECIMAR, Departamento de Ecología & Evolución; Facultad de Ciencias, Universidad de la República; Montevideo Uruguay
| | - A. G. Wood
- British Antarctic Survey; Natural Environment Research Council, High Cross; Cambridge UK
| | - H. Froy
- Institute of Evolutionary Biology; University of Edinburgh; Edinburgh UK
| | - J. C. Xavier
- British Antarctic Survey; Natural Environment Research Council, High Cross; Cambridge UK
- Department of Life Sciences, Faculty of Sciences and Technology; IMAR-CMA-Institute of Marine Research, University of Coimbra; Coimbra Portugal
- MARE - Marine and Environmental Sciences Centre; Faculty of Sciences and Technology; IMAR-CMA-Institute of Marine Research, University of Coimbra; Coimbra Portugal
| | - R. A. Phillips
- British Antarctic Survey; Natural Environment Research Council, High Cross; Cambridge UK
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Xavier JC, Strunz WT, Beims MW. Dissipative dynamics in a finite chaotic environment: Relationship between damping rate and Lyapunov exponent. Phys Rev E Stat Nonlin Soft Matter Phys 2015; 92:022908. [PMID: 26382477 DOI: 10.1103/physreve.92.022908] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Indexed: 06/05/2023]
Abstract
We consider the energy flow between a classical one-dimensional harmonic oscillator and a set of N two-dimensional chaotic oscillators, which represents the finite environment. Using linear response theory we obtain an analytical effective equation for the system harmonic oscillator, which includes a frequency dependent dissipation, a shift, and memory effects. The damping rate is expressed in terms of the environment mean Lyapunov exponent. A good agreement is shown by comparing theoretical and numerical results, even for environments with mixed (regular and chaotic) motion. Resonance between system and environment frequencies is shown to be more efficient to generate dissipation than larger mean Lyapunov exponents or a larger number of bath chaotic oscillators.
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Affiliation(s)
- J C Xavier
- Departamento de Física, Universidade Federal do Paraná, 81531-980 Curitiba, Brazil
- Institut für Theoretische Physik, Technische Universität Dresden, D-01069 Dresden, Germany
| | - W T Strunz
- Institut für Theoretische Physik, Technische Universität Dresden, D-01069 Dresden, Germany
| | - M W Beims
- Departamento de Física, Universidade Federal do Paraná, 81531-980 Curitiba, Brazil
- Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Strasse 38, D-01187 Dresden, Germany
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Tavares S, Xavier JC, Phillips RA, Pereira ME, Pardal MA. Influence of age, sex and breeding status on mercury accumulation patterns in the wandering albatross Diomedea exulans. Environ Pollut 2013; 181:315-320. [PMID: 23859845 DOI: 10.1016/j.envpol.2013.06.032] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 06/21/2013] [Accepted: 06/23/2013] [Indexed: 06/02/2023]
Abstract
Although mercury bio-amplifies through the food chain and accumulates in top predators, mercury concentrations in tissues of the wandering albatross are greater than in any other vertebrate, including closely related species. In order to explore the alternative explanations for this pattern, we measured total mercury concentrations in feathers, plasma and blood cells of wandering albatrosses of known age, sex and breeding status sampled at South Georgia. Mercury concentrations were low in feathers and blood components of chicks, and higher in the feathers of young pre-breeders than in feathers or blood of older pre-breeders and breeding adults. There was no effect of sex on mercury concentrations in the feathers of pre-breeders or breeding adults, whereas levels were significantly higher in blood cells of breeding females than males. The high feather mercury concentrations of young pre-breeders compared with older birds suggest an increase in moult frequency as birds approach maturity.
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Affiliation(s)
- S Tavares
- CFE (Centre for Functional Ecology), Department of Life Sciences, University of Coimbra, PO Box 3046, 3001-401 Coimbra, Portugal.
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Roberts J, Xavier JC, Agnew DJ. The diet of toothfish species Dissostichus eleginoides and Dissostichus mawsoni with overlapping distributions. J Fish Biol 2011; 79:138-154. [PMID: 21722116 DOI: 10.1111/j.1095-8649.2011.03005.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The diets of Antarctic toothfish Dissostichus mawsoni and Patagonian toothfish Dissostichus eleginoides were examined around the South Sandwich Islands in the Southern Ocean, one of few regions with overlapping populations of the two species. Despite large differences in the proportion of stomachs containing prey (76·2% of D. mawsoni compared to 7·2% of D. eleginoides), diet composition was broadly similar (Schoener overlap index of 74·4% based on prey mass) with finfishes (particularly macrourids and muraenolepidids) and cephalopods (mainly Kondakovia longimana) comprising >90% of the prey mass of both species. Predation rates of the main fish prey, as mean counts per stomach sampled, were spatially correlated with their relative abundance around the islands derived from fishery by-catch data, suggesting a general lack of prey selectivity. This study supports the view that bathyal Dissostichus are opportunistic carnivores and finds that D. mawsoni and D. eleginoides occupy a similar trophic niche and are likely to compete for prey in regions where both are distributed. The large increase in rate of prey occurrence and size of prey in D. mawsoni stomachs relative to D. eleginoides suggests, however, species differences in feeding behaviour, which may reflect the increased metabolic demands of a cold-water adapted physiology. [Correction added after online publication 13 June 2011: spelling of species name corrected].
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Affiliation(s)
- J Roberts
- Division of Biology, Imperial College London, Silwood Park Campus, Ascot, Berkshire SL5 7PY, UK.
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Abstract
The Kondo lattice model enlarged by an antiferromagnetic coupling J AF between the localized spins is here investigated using computational techniques. Our results suggest the existence of a d-wave superconducting phase close to half-filling mediated by antiferromagnetic fluctuations. This establishes a closer connection between theory and heavy fermion experiments than currently provided by the standard Kondo lattice model with J AF=0.
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Affiliation(s)
- J C Xavier
- Instituto de Física, Universidade Federal de Uberlândia, CP 593, Uberlândia MG 38400-902, Brazil
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Abstract
We report the presence of spin dimerization in the ground state of the one-dimensional Kondo lattice model at quarter filling. The emergence of this new phase of the Kondo lattice can be traced to the form of the RKKY interaction between the localized moments and provides the first example of dimerization induced indirectly by itinerant electrons. We propose this dimer ordering as the driving mechanism of the spin-Peierls phase observed in the quasi-one-dimensional organic compounds (Per)2M(mnt)(2) (M=Pt, Pd). Moreover, this suggests that a richer phase diagram than the Doniach paradigm may be needed to accommodate the physics of heavy fermion materials.
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Affiliation(s)
- J C Xavier
- Instituto de Física Gleb Wataghin, Unicamp, CP 6165, Campinas SP 13083-970, Brazil
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Martins GB, Gazza C, Xavier JC, Feiguin A, Dagotto E. Doped stripes in models for the cuprates emerging from the one-hole properties of the insulator. Phys Rev Lett 2000; 84:5844-5847. [PMID: 10991069 DOI: 10.1103/physrevlett.84.5844] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2000] [Indexed: 05/23/2023]
Abstract
The extended and standard t-J models are computationally studied on ladders and planes, with emphasis on the small J/t region. At couplings compatible with photoemission results for undoped cuprates, half-doped stripes separating pi-shifted antiferromagnetic (AF) domains are found, as in Tranquada's interpretation of neutron experiments. Our main result is that the elementary stripe "building block" resembles the properties of one hole at small J/t, with robust AF correlations across the hole induced by the local tendency of the charge to separate from the spin. This suggests that the seed of half-doped stripes already exists in the unusual properties of the insulating parent compound.
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Affiliation(s)
- G B Martins
- National High Magnetic Field Lab and Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
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Barg N, Zanarde LD, Moura CR, Monteiro PF, Xavier JC, dos Reis DJ. [Plastic or metallic ring as an aid in valvar prostheses]. Arq Bras Cardiol 1980; 34:299-301. [PMID: 7002121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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