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Gumbs R, Scott O, Bates R, Böhm M, Forest F, Gray CL, Hoffmann M, Kane D, Low C, Pearse WD, Pipins S, Tapley B, Turvey ST, Jetz W, Owen NR, Rosindell J. Global conservation status of the jawed vertebrate Tree of Life. Nat Commun 2024; 15:1101. [PMID: 38424441 PMCID: PMC10904806 DOI: 10.1038/s41467-024-45119-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 01/16/2024] [Indexed: 03/02/2024] Open
Abstract
Human-driven extinction threatens entire lineages across the Tree of Life. Here we assess the conservation status of jawed vertebrate evolutionary history, using three policy-relevant approaches. First, we calculate an index of threat to overall evolutionary history, showing that we expect to lose 86-150 billion years (11-19%) of jawed vertebrate evolutionary history over the next 50-500 years. Second, we rank jawed vertebrate species by their EDGE scores to identify the highest priorities for species-focused conservation of evolutionary history, finding that chondrichthyans, ray-finned fish and testudines rank highest of all jawed vertebrates. Third, we assess the conservation status of jawed vertebrate families. We found that species within monotypic families are more likely to be threatened and more likely to be in decline than other species. We provide a baseline for the status of families at risk of extinction to catalyse conservation action. This work continues a trend of highlighting neglected groups-such as testudines, crocodylians, amphibians and chondrichthyans-as conservation priorities from a phylogenetic perspective.
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Affiliation(s)
- Rikki Gumbs
- Zoological Society of London, London, NW1 4RY, UK.
- Science and Solutions for a Changing Planet DTP, Grantham Institute, Imperial College London, London, SW7 2AZ, UK.
- Department of Life Sciences, Silwood Park Campus, Imperial College London, Ascot, Berkshire, SL5 7PY, UK.
| | - Oenone Scott
- Department of Life Sciences, Silwood Park Campus, Imperial College London, Ascot, Berkshire, SL5 7PY, UK
- School of Life Sciences, University of Essex, Colchester, CO4 3SQ, UK
| | - Ryan Bates
- Zoological Society of London, London, NW1 4RY, UK
- Department of Life Sciences, Silwood Park Campus, Imperial College London, Ascot, Berkshire, SL5 7PY, UK
| | - Monika Böhm
- Global Center for Species Survival, Indianapolis Zoological Society, Indianapolis, IN, 46222, USA
| | - Félix Forest
- Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE, UK
| | | | | | - Daniel Kane
- Zoological Society of London, London, NW1 4RY, UK
| | - Christopher Low
- Department of Genetics, Evolution and Environment, Centre for Biodiversity and Environment Research, University College London, London, WC1E 6BT, UK
| | - William D Pearse
- Department of Life Sciences, Silwood Park Campus, Imperial College London, Ascot, Berkshire, SL5 7PY, UK
| | - Sebastian Pipins
- Science and Solutions for a Changing Planet DTP, Grantham Institute, Imperial College London, London, SW7 2AZ, UK
- Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE, UK
- On the Edge, London, SW3 2JJ, UK
| | | | - Samuel T Turvey
- Institute of Zoology, Zoological Society of London, London, NW1 4RY, UK
| | - Walter Jetz
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06511, USA
- Center for Biodiversity and Global Change, Yale University, New Haven, CT, 06511, USA
| | | | - James Rosindell
- Department of Life Sciences, Silwood Park Campus, Imperial College London, Ascot, Berkshire, SL5 7PY, UK
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Gumbs R, Chaudhary A, Daru BH, Faith DP, Forest F, Gray CL, Kowalska A, Lee WS, Pellens R, Pipins S, Pollock LJ, Rosindell J, Scherson RA, Owen NR. Indicators to monitor the status of the tree of life. Conserv Biol 2023; 37:e14138. [PMID: 37377164 DOI: 10.1111/cobi.14138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 02/21/2023] [Accepted: 06/08/2023] [Indexed: 06/29/2023]
Abstract
Following the failure to fully achieve any of the 20 Aichi biodiversity targets, the future of biodiversity rests in the balance. The Convention on Biological Diversity's Kunming-Montreal Global Biodiversity Framework (GBF) presents the opportunity to preserve nature's contributions to people (NCPs) for current and future generations by conserving biodiversity and averting extinctions. There is a need to safeguard the tree of life-the unique and shared evolutionary history of life on Earth-to maintain the benefits it bestows into the future. Two indicators have been adopted within the GBF to monitor progress toward safeguarding the tree of life: the phylogenetic diversity (PD) indicator and the evolutionarily distinct and globally endangered (EDGE) index. We applied both to the world's mammals, birds, and cycads to show their utility at the global and national scale. The PD indicator can be used to monitor the overall conservation status of large parts of the evolutionary tree of life, a measure of biodiversity's capacity to maintain NCPs for future generations. The EDGE index is used to monitor the performance of efforts to conserve the most distinctive species. The risk to PD of birds, cycads, and mammals increased, and mammals exhibited the greatest relative increase in threatened PD over time. These trends appeared robust to the choice of extinction risk weighting. EDGE species had predominantly worsening extinction risk. A greater proportion of EDGE mammals (12%) had increased extinction risk compared with threatened mammals in general (7%). By strengthening commitments to safeguarding the tree of life, biodiversity loss can be reduced and thus nature's capacity to provide benefits to humanity now and in the future can be preserved.
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Affiliation(s)
- Rikki Gumbs
- EDGE of Existence Programme, Zoological Society of London, London, UK
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, UK
- IUCN SSC Phylogenetic Diversity Task Force, London, UK
| | - Abhishek Chaudhary
- Department of Civil Engineering, Indian Institute of Technology (IIT) Kanpur, Kanpur, India
| | - Barnabas H Daru
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA
- Department of Biology, Stanford University, Stanford, CA, USA
| | - Daniel P Faith
- The Australian Museum Research Institute, The Australian Museum, Sydney, New South Wales, Australia
| | - Félix Forest
- Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, UK
| | - Claudia L Gray
- EDGE of Existence Programme, Zoological Society of London, London, UK
| | | | - Who-Seung Lee
- Environmental Assessment Group, Korea Environment Institute, Sejong, Republic of Korea
| | - Roseli Pellens
- Institut de Systématique, Evolution, et Biodiversité (Muséum National d'Histoire Naturelle, Centre National pour la Recherche Scientifique, Sorbonne Université, Ecole Pratique de Hautes Etudes, Université des Antilles), Paris, France
| | - Sebastian Pipins
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, UK
- Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, UK
| | - Laura J Pollock
- Department of Biology, McGill University, Montréal, Québec, Canada
| | - James Rosindell
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, UK
| | - Rosa A Scherson
- Departamento de Silvicultura y Conservación de la Naturaleza, Universidad de Chile, Santiago, Chile
| | - Nisha R Owen
- IUCN SSC Phylogenetic Diversity Task Force, London, UK
- On the EDGE Conservation, Chelsea, UK
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Gumbs R, Gray CL, Hoffmann M, Molina-Venegas R, Owen NR, Pollock LJ. Conserving avian evolutionary history can effectively safeguard future benefits for people. Sci Adv 2023; 9:eadh4686. [PMID: 37729417 PMCID: PMC10511189 DOI: 10.1126/sciadv.adh4686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 08/21/2023] [Indexed: 09/22/2023]
Abstract
Phylogenetic diversity (PD)-the evolutionary history of a set of species-is conceptually linked to the maintenance of yet-to-be-discovered benefits from biodiversity or "option value." We used global phylogenetic and utilization data for birds to test the PD option value link, under the assumption that the performance of sets of PD-maximizing species at capturing known benefits is analogous to selecting the same species at a point in human history before these benefits were realized. PD performed better than random at capturing utilized bird species across 60% of tests, with performance linked to the phylogenetic dispersion and prevalence of each utilization category. Prioritizing threatened species for conservation by the PD they encapsulate performs comparably to prioritizing by their functional distinctiveness. However, species selected by each metric show low overlap, indicating that we should conserve both components of biodiversity to effectively conserve a variety of uses. Our findings provide empirical support for the link between evolutionary history and benefits for future generations.
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Affiliation(s)
- Rikki Gumbs
- Conservation and Policy, Zoological Society of London, London NW1 4RY, UK
- Science and Solutions for a Changing Planet DTP, Grantham Institute, Imperial College London, London SW7 2AZ, UK
- IUCN SSC Phylogenetic Diversity Task Force, London, UK
| | - Claudia L Gray
- Conservation and Policy, Zoological Society of London, London NW1 4RY, UK
- IUCN SSC Phylogenetic Diversity Task Force, London, UK
| | - Michael Hoffmann
- Conservation and Policy, Zoological Society of London, London NW1 4RY, UK
| | - Rafael Molina-Venegas
- Department of Ecology, Faculty of Science, Universidad Autónoma de Madrid, Madrid, Spain
| | - Nisha R Owen
- IUCN SSC Phylogenetic Diversity Task Force, London, UK
- On the Edge Conservation, London SW3 2JJ, UK
| | - Laura J Pollock
- IUCN SSC Phylogenetic Diversity Task Force, London, UK
- Department of Biology, McGill University, Montréal, Québec H3A 1B1, Canada
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Gumbs R, Gray CL, Böhm M, Burfield IJ, Couchman OR, Faith DP, Forest F, Hoffmann M, Isaac NJB, Jetz W, Mace GM, Mooers AO, Safi K, Scott O, Steel M, Tucker CM, Pearse WD, Owen NR, Rosindell J. The EDGE2 protocol: Advancing the prioritisation of Evolutionarily Distinct and Globally Endangered species for practical conservation action. PLoS Biol 2023; 21:e3001991. [PMID: 36854036 PMCID: PMC9974121 DOI: 10.1371/journal.pbio.3001991] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023] Open
Abstract
The conservation of evolutionary history has been linked to increased benefits for humanity and can be captured by phylogenetic diversity (PD). The Evolutionarily Distinct and Globally Endangered (EDGE) metric has, since 2007, been used to prioritise threatened species for practical conservation that embody large amounts of evolutionary history. While there have been important research advances since 2007, they have not been adopted in practice because of a lack of consensus in the conservation community. Here, building from an interdisciplinary workshop to update the existing EDGE approach, we present an "EDGE2" protocol that draws on a decade of research and innovation to develop an improved, consistent methodology for prioritising species conservation efforts. Key advances include methods for dealing with uncertainty and accounting for the extinction risk of closely related species. We describe EDGE2 in terms of distinct components to facilitate future revisions to its constituent parts without needing to reconsider the whole. We illustrate EDGE2 by applying it to the world's mammals. As we approach a crossroads for global biodiversity policy, this Consensus View shows how collaboration between academic and applied conservation biologists can guide effective and practical priority-setting to conserve biodiversity.
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Affiliation(s)
- Rikki Gumbs
- Conservation and Policy, Zoological Society of London, Regent’s Park, London, United Kingdom
- Department of Life Sciences, Silwood Park Campus, Imperial College London, Ascot, Berkshire, United Kingdom
- IUCN SSC Phylogenetic Diversity Task Force, London, United Kingdom
- Science and Solutions for a Changing Planet DTP, Grantham Institute, Imperial College London, South Kensington, London, United Kingdom
- * E-mail:
| | - Claudia L. Gray
- Conservation and Policy, Zoological Society of London, Regent’s Park, London, United Kingdom
| | - Monika Böhm
- Institute of Zoology, Zoological Society of London, Regent’s Park, London, United Kingdom
- Global Center for Species Survival, Indianapolis Zoological Society, Indianapolis, Indiana, United States of America
| | - Ian J. Burfield
- BirdLife International, David Attenborough Building, Cambridge, United Kingdom
| | - Olivia R. Couchman
- Conservation and Policy, Zoological Society of London, Regent’s Park, London, United Kingdom
| | - Daniel P. Faith
- School of Philosophical and Historical Inquiry, The University of Sydney, Sydney, Australia
| | - Félix Forest
- Royal Botanic Gardens, Kew, Richmond, Surrey, United Kingdom
| | - Michael Hoffmann
- Conservation and Policy, Zoological Society of London, Regent’s Park, London, United Kingdom
| | - Nick J. B. Isaac
- UK Centre for Ecology & Hydrology, Crowmarsh Gifford, Wallingford, United Kingdom
| | - Walter Jetz
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, Connecticut, United States of America
- Center for Biodiversity and Global Change, Yale University, New Haven, Connecticut, United States of America
| | - Georgina M. Mace
- Department of Genetics, Evolution & Environment, University College London, London, United Kingdom
| | - Arne O. Mooers
- Biological Sciences, Simon Fraser University, Burnaby, BC, Canada
| | - Kamran Safi
- Max-Planck Institute of Animal Behavior, Department of Migration, Radolfzell, Germany
- University of Konstanz, Department of Biology, Konstanz, Germany
| | - Oenone Scott
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | - Mike Steel
- Biomathematics Research Centre, University of Canterbury, Christchurch, New Zealand
| | - Caroline M. Tucker
- Environment, Ecology and Energy Program, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - William D. Pearse
- Department of Life Sciences, Silwood Park Campus, Imperial College London, Ascot, Berkshire, United Kingdom
- Department of Biology and Ecology Center, Utah State University, Logan, Utah, United States of America
| | - Nisha R. Owen
- Conservation and Policy, Zoological Society of London, Regent’s Park, London, United Kingdom
- IUCN SSC Phylogenetic Diversity Task Force, London, United Kingdom
- On the EDGE Conservation, London, United Kingdom
| | - James Rosindell
- Department of Life Sciences, Silwood Park Campus, Imperial College London, Ascot, Berkshire, United Kingdom
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Parks D, Al‐Fulaij N, Brook C, Butchart SHM, Collomb J, Cope D, Dowell S, Falkingham B, Frick WF, Gibbs D, Gray EE, Heard N, Leventis A(T, Mastro K, Meredith H, Mickleburgh S, Miller F, Muir M, Nuijten RJM, Ockendon N, Owen NR, Owens JR, Rodríguez JP, Roy S, Tully E, Vié J. Funding evidence-based conservation. Conserv Biol 2022; 36:e13991. [PMID: 36214416 PMCID: PMC10092027 DOI: 10.1111/cobi.13991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 08/12/2022] [Accepted: 08/15/2022] [Indexed: 06/16/2023]
Affiliation(s)
| | | | | | | | | | | | | | | | | | - Douglas Gibbs
- Darwin Initiative, Department for Environment, Food and Rural AffairsLondonUK
| | | | - Nicolas Heard
- Mohamed bin Zayed Species Conservation FundAbu DhabiUnited Arab Emirates
| | | | - Kate Mastro
- The Wildlife Conservation SocietyBronxNew YorkUSA
| | | | | | | | - Matthew Muir
- United States Fish and Wildlife Service International AffairsFalls ChurchVirginiaUSA
| | | | - Nancy Ockendon
- Endangered Landscapes ProgrammeCambridge Conservation InitiativeCambridgeUK
| | | | - Jacob R. Owens
- Los Angeles Zoo & Botanical GardensLos AngelesCaliforniaUSA
| | - Jon Paul Rodríguez
- IUCN Species Survival CommissionVenezuelan Institute for Scientific Investigation and ProvitaCaracasVenezuela
| | - Sugoto Roy
- IUCN SSC Cat Specialist GroupIttigenSwitzerland
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Christoph Liedtke H, Lyakurwa JV, Lawson LP, Menegon M, Garrido-Priego M, Mariaux J, Ngalason W, Channing A, Owen NR, Bittencourt-Silva GB, Wilkinson M, Larson JG, Loader SP. Thirty years of amphibian surveys in the Ukagurus Mountains of Tanzania reveal new species, yet others are in decline. AFR J HERPETOL 2022. [DOI: 10.1080/21564574.2022.2043945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- H Christoph Liedtke
- Ecology, Evolution and Development Group, Department of Wetland Ecology, Estación Biológica de Doñana (CSIC), Sevilla, Spain
| | - John V Lyakurwa
- Department of Zoology and Wildlife Conservation, University of Dar es Salaam, Dar es Salaam, Tanzania
| | - Lucinda P Lawson
- Biological Sciences, University of Cincinnati, Cincinnati, Ohio, USA
| | - Michele Menegon
- Division of Biology & Conservation Ecology, School of Science & the Environment, Manchester Metropolitan University, Manchester, UK
- PAMS Foundation, Arusha, Tanzania
| | - Marina Garrido-Priego
- Ecology, Evolution and Development Group, Department of Wetland Ecology, Estación Biológica de Doñana (CSIC), Sevilla, Spain
- Division of Behavioural Ecology, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
| | - Jean Mariaux
- Natural History Museum of Geneva, Geneva, Switzerland
| | - Wilirk Ngalason
- Department of Zoology and Wildlife Conservation, University of Dar es Salaam, Dar es Salaam, Tanzania
| | - Alan Channing
- Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - Nisha R Owen
- On the EDGE Conservation, London, UK
- The Society for Environmental Exploration (Frontier), London, UK
| | - Gabriela B Bittencourt-Silva
- Ecology, Evolution and Development Group, Department of Wetland Ecology, Estación Biológica de Doñana (CSIC), Sevilla, Spain
| | - Mark Wilkinson
- Department of Life Sciences, Natural History Museum, London, UK
| | - Joanna G Larson
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Simon P Loader
- Department of Life Sciences, Natural History Museum, London, UK
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Gumbs R, Gray CL, Böhm M, Hoffmann M, Grenyer R, Jetz W, Meiri S, Roll U, Owen NR, Rosindell J. Global priorities for conservation of reptilian phylogenetic diversity in the face of human impacts. Nat Commun 2020; 11:2616. [PMID: 32457412 PMCID: PMC7250838 DOI: 10.1038/s41467-020-16410-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 04/24/2020] [Indexed: 11/09/2022] Open
Abstract
Phylogenetic diversity measures are increasingly used in conservation planning to represent aspects of biodiversity beyond that captured by species richness. Here we develop two new metrics that combine phylogenetic diversity and the extent of human pressure across the spatial distribution of species - one metric valuing regions and another prioritising species. We evaluate these metrics for reptiles, which have been largely neglected in previous studies, and contrast these results with equivalent calculations for all terrestrial vertebrate groups. We find that regions under high human pressure coincide with the most irreplaceable areas of reptilian diversity, and more than expected by chance. The highest priority reptile species score far above the top mammal and bird species, and reptiles include a disproportionate number of species with insufficient extinction risk data. Data Deficient species are, in terms of our species-level metric, comparable to Critically Endangered species and therefore may require urgent conservation attention.
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Affiliation(s)
- Rikki Gumbs
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, Berkshire, SL5 7PY, UK.
- Science and Solutions for a Changing Planet DTP, Grantham Institute, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.
- EDGE of Existence Programme, Zoological Society of London, Regent's Park, London, NW1 4RY, UK.
| | - Claudia L Gray
- EDGE of Existence Programme, Zoological Society of London, Regent's Park, London, NW1 4RY, UK
| | - Monika Böhm
- Institute of Zoology, Zoological Society of London, Regent's Park, London, NW1 4RY, UK
| | - Michael Hoffmann
- Conservation and Policy, Zoological Society of London, Regent's Park, London, NW1 4RY, UK
| | - Richard Grenyer
- School of Geography and the Environment, University of Oxford, Oxford, OX1 3QY, UK
| | - Walter Jetz
- Ecology and Evolutionary Biology Department, Yale University, 165 Prospect Street, New Haven, CT, 06511, USA
- Center for Biodiversity and Global Change, Yale University, 165 Prospect Street, New Haven, CT, 06511, USA
| | - Shai Meiri
- School of Zoology, Tel Aviv University, 6997801, Tel Aviv, Israel
- Steinhardt Museum of Natural History, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Uri Roll
- Mitrani Department of Desert Ecology, Ben-Gurion University of the Negev, Midreshet Ben-Gurion, 8499000, Israel
| | - Nisha R Owen
- On The EDGE Conservation, 152a Walton St, Chelsea, London, SW3 2JJ, UK
| | - James Rosindell
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, Berkshire, SL5 7PY, UK
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Owen NR, Gumbs R, Gray CL, Faith DP. Global conservation of phylogenetic diversity captures more than just functional diversity. Nat Commun 2019; 10:859. [PMID: 30787282 PMCID: PMC6382770 DOI: 10.1038/s41467-019-08600-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 01/18/2019] [Indexed: 11/08/2022] Open
Affiliation(s)
- Nisha R Owen
- EDGE of Existence Programme, Zoological Society of London, Regent's Park, London, NW1 4RY, United Kingdom.
- On the EDGE Conservation, London, W2 5EU, United Kingdom.
| | - Rikki Gumbs
- EDGE of Existence Programme, Zoological Society of London, Regent's Park, London, NW1 4RY, United Kingdom
- Science and Solutions for a Changing Planet DTP, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Claudia L Gray
- EDGE of Existence Programme, Zoological Society of London, Regent's Park, London, NW1 4RY, United Kingdom
| | - Daniel P Faith
- The Australian Museum Research Institute, The Australian Museum, Sydney, 2010, Australia
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9
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Owen NR, Chapelon JY, Bouchoux G, Berriet R, Fleury G, Lafon C. Dual-mode transducers for ultrasound imaging and thermal therapy. Ultrasonics 2010; 50:216-220. [PMID: 19758673 DOI: 10.1016/j.ultras.2009.08.009] [Citation(s) in RCA: 17] [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] [Received: 07/13/2009] [Revised: 08/10/2009] [Accepted: 08/12/2009] [Indexed: 05/28/2023]
Abstract
Medical imaging is a vital component of high intensity focused ultrasound (HIFU) therapy, which is gaining clinical acceptance for tissue ablation and cancer therapy. Imaging is necessary to plan and guide the application of therapeutic ultrasound, and to monitor the effects it induces in tissue. Because they can transmit high intensity continuous wave ultrasound for treatment and pulsed ultrasound for imaging, dual-mode transducers aim to improve the guidance and monitoring stages. Their primary advantage is implicit registration between the imaging and treatment axes, and so they can help ensure before treatment that the therapeutic beam is correctly aligned with the planned treatment volume. During treatment, imaging signals can be processed in real-time to assess acoustic properties of the tissue that are related to thermal ablation. Piezocomposite materials are favorable for dual-mode transducers because of their improved bandwidth, which in turn improves imaging performance while maintaining high efficiency for treatment. Here we present our experiences with three dual-mode transducers for interstitial applications. The first was an 11-MHz monoelement designed for use in the bile duct. It had a 25x7.5 mm(2) aperture that was cylindrically focused to 10mm. The applicator motion was step-wise rotational for imaging and therapy over a 360 degrees, or smaller, sector. The second transducer had 5-elements, each measuring 3.0x3.8 mm(2) for a total aperture of 3.0x20 mm(2). It operated at 5.6 MHz, was cylindrically focused to 14 mm, and was integrated with a servo-controlled oscillating probe designed for sector imaging and directive therapy in the liver. The last transducer was a 5-MHz, 64-element linear array designed for beam-formed imaging and therapy. The aperture was 3.0x18 mm(2) with a pitch of 0.280 mm. Characterization results included conversion efficiencies above 50%, pulse-echo bandwidths above 50%, surface intensities up to 30 W/cm(2), and axial imaging resolutions to 0.2 mm. The second transducer was evaluated in vivo using porcine liver, where coagulation necrosis was induced up to a depth of 20 mm in 120 s. B-mode and M-mode images displayed a hypoechoic region that agreed well with lesion depth observed by gross histology. These feasibility studies demonstrate that the dual-mode transducers had imaging performance that was sufficient to aid the guidance and monitoring of treatment, and could sustain high intensities to induce coagulation necrosis in vivo.
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Affiliation(s)
- N R Owen
- Inserm, U556, Lyon F-69003, France.
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10
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Owen NR, Bouchoux G, Murillo A, Merouche S, Birer A, Chapelon JY, Berriet R, Fleury G, Lafon C. In vitro evaluation of an oscillating dual-mode ultrasound probe for sector imaging and directive therapy. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2008:3669-72. [PMID: 19163506 DOI: 10.1109/iembs.2008.4650003] [Citation(s) in RCA: 2] [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] [Indexed: 11/10/2022]
Abstract
Interstitial probes have been shown as effective devices to deliver high-intensity ultrasound therapy. Here, cylindrically-focused dual-mode transducers with either one or 5-elements were characterized, and a monoelement probe was evaluated in vitro. In therapy mode, the transducers were maximally efficient (> or =70%) at 5.6 MHz with surface intensities up to 20 W/cm(2). In imaging mode, fractional bandwidths were 46% and 50+/-4% (ave+/-std) for the monoelement and 5-element transducers respectively. Axial and lateral resolutions were 0.5 mm and 1.0 mm, respectively, for both transducers as measured with a point scatterer in the focal plane. After characterization, the oscillating probe was used to image and apply therapy to porcine liver. B-mode images over a 140 degrees sector were formed before and after therapy, which was applied for 90 s at each of 5 angles separated by 20 degrees (e.g. -40 degrees , -20 degrees, 0 degrees, 20 degrees, 40 degrees) to form a composite lesion. Transducer surface intensity was 18 W/cm(2). Therapy was interrupted at 125 ms intervals to collect pulse/echo data along the therapy axes. Data were displayed in real-time as an M-mode image to monitor therapy. B-mode images adequately represented the liver tissue. M-mode image data agreed well with the formation of lesions in the liver.
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