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Elsler LG, Oostdijk M, Gephart JA, Free CM, Zhao J, Tekwa E, Bochniewicz EM, Giron-Nava A, Johnson AF. Global trade network patterns are coupled to fisheries sustainability. PNAS Nexus 2023; 2:pgad301. [PMID: 37817775 PMCID: PMC10560747 DOI: 10.1093/pnasnexus/pgad301] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 07/12/2023] [Accepted: 08/31/2023] [Indexed: 10/12/2023]
Abstract
The rapid development of seafood trade networks alongside the decline in biomass of many marine populations raises important questions about the role of global trade in fisheries sustainability. Mounting empirical and theoretical evidence shows the importance of trade development on commercially exploited species. However, there is limited understanding of how the development of trade networks, such as differences in connectivity and duration, affects fisheries sustainability. In a global analysis of over 400,000 bilateral trade flows and stock status estimates for 876 exploited fish and marine invertebrates from 223 territories, we reveal patterns between seafood trade network indicators and fisheries sustainability using a dynamic panel regression analysis. We found that fragmented networks with strong connectivity within a group of countries and weaker links between those groups (modularity) are associated with higher relative biomass. From 1995 to 2015, modularity fluctuated, and the number of trade connections (degree) increased. Unlike previous studies, we found no relationship between the number or duration of trade connections and fisheries sustainability. Our results highlight the need to jointly investigate fisheries and trade. Improved coordination and partnerships between fisheries authorities and trade organizations present opportunities to foster more sustainable fisheries.
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Affiliation(s)
- Laura G Elsler
- Stockholm Resilience Centre, Stockholm University, 11419 Stockholm, Sweden
| | - Maartje Oostdijk
- School of Environment and Natural Resources, University of Iceland, 101 Reykjavik, Iceland
| | - Jessica A Gephart
- Department of Environmental Science, American University, Washington, DC 20016, USA
| | - Christopher M Free
- Bren School of Environmental Science and Management, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
- Marine Science Institute, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Junfu Zhao
- Institute of Marxism, Fudan University, Shanghai 200433, China
| | - Eden Tekwa
- Department of Biology, McGill University, Montreal, QC H3A 1B1, Canada
| | | | - Alfredo Giron-Nava
- Stanford Center for Ocean Solutions, Stanford University, Palo Alto, CA 94305, USA
| | - Andrew F Johnson
- Marine SPACE group, The Lyell Centre, Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh, Currie, Scotland EH14 4AS, UK
- MarFishEco Fisheries Consultants Ltd., Edinburgh, Scotland EH7 5HT, UK
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Tekwa E, Gonzalez A, Zurell D, O'Connor M. Detecting and attributing the causes of biodiversity change: needs, gaps and solutions. Philos Trans R Soc Lond B Biol Sci 2023; 378:20220181. [PMID: 37246389 DOI: 10.1098/rstb.2022.0181] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 04/11/2023] [Indexed: 05/30/2023] Open
Abstract
This issue addresses the multifaceted problems of understanding biodiversity change to meet emerging international development and conservation goals, national economic accounting and diverse community needs. Recent international agreements highlight the need to establish monitoring and assessment programmes at national and regional levels. We identify an opportunity for the research community to develop the methods for robust detection and attribution of biodiversity change that will contribute to national assessments and guide conservation action. The 16 contributions of this issue address six major aspects of biodiversity assessment: connecting policy to science, establishing observation, improving statistical estimation, detecting change, attributing causes and projecting the future. These studies are led by experts in Indigenous studies, economics, ecology, conservation, statistics, and computer science, with representations from Asia, Africa, South America, North America and Europe. The results place biodiversity science in the context of policy needs and provide an updated roadmap for how to observe biodiversity change in a way that supports conservation action via robust detection and attribution science. This article is part of the theme issue 'Detecting and attributing the causes of biodiversity change: needs, gaps and solutions'.
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Affiliation(s)
- Eden Tekwa
- Department of Zoology and Biodiversity Research Centre, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
- Department of Biology, McGill University, Montreal, Quebec, Canada H3A 1B1
- Hakai Institute, Heriot Bay, British Columbia, Canada V0P 1H0
| | - Andrew Gonzalez
- Department of Biology, McGill University, Montreal, Quebec, Canada H3A 1B1
| | - Damaris Zurell
- Institute for Biochemistry and Biology, University of Potsdam, 14469 Potsdam, Germany
| | - Mary O'Connor
- Department of Zoology and Biodiversity Research Centre, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
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