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Patterns and Emerging Trends in Global Ocean Health

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Halpern, Benjamin S., Longo, Catherine, Lowndes, Julia S. Stewart, Best, Benjamin D., Frazier, Melanie, Katona, Steven K., Kleisner, Kristin M., Rosenberg, Andrew A., Scarborough, Courtney, Selig, Elizabeth R.·2015·PLOS ONE

DOI 10.1371/journal.pone.0117863PMC PMC4361765

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Abstract

International and regional policies aimed at managing ocean ecosystem health need quantitative and comprehensive indices to synthesize information from a variety of sources, consistently measure progress, and communicate with key constituencies and the public. Here we present the second annual global assessment of the Ocean Health Index, reporting current scores and annual changes since 2012, recalculated using updated methods and data based on the best available science, for 221 coastal countries and territories. The Index measures performance of ten societal goals for healthy oceans on a quantitative scale of increasing health from 0 to 100, and combines these scores into a single Index score, for each country and globally. The global Index score improved one point (from 67 to 68), while many country-level Index and goal scores had larger changes. Per-country Index scores ranged from 41-95 and, on average, improved by 0.06 points (range -8 to +12). Globally, average scores increased for individual goals by as much as 6.5 points (coastal economies) and decreased by as much as 1.2 points (natural products). Annual updates of the Index, even when not all input data have been updated, provide valuable information to scientists, policy makers, and resource managers because patterns and trends can emerge from the data that have been updated. Changes of even a few points indicate potential successes (when scores increase) that merit recognition, or concerns (when scores decrease) that may require mitigative action, with changes of more than 10-20 points representing large shifts that deserve greater attention. Goal scores showed remarkably little covariance across regions, indicating low redundancy in the Index, such that each goal delivers information about a different facet of ocean health. Together these scores provide a snapshot of global ocean health and suggest where countries have made progress and where a need for further improvement exists.

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Fig 1 Global scores for the Ocean Health Index. Maps of overall Index scores for each reporting region (left panels) and global Index and goal scores (right panels) for newly calculated 2013 values (bottom panels) and recalculated 2012 values using updated methods and data (top panels). Colors in all cases indicate score values.CC BY · PubMed Central

Fig 2 Index and goal scores for representative countries and territories for 2013. Examples shown include three of the top five highest-scoring regions in the world, the three lowest scoring regions, and regions of potential interest.CC BY · PubMed Central

Fig 3 Change in Index and goal scores. Maps of the absolute difference of 2013 scores minus 2012 scores for each region for the overall Index (top panel) and four goals and sub-goals (bottom panels). Maps for all goals and sub-goals are presented in Figs. A-B in S1 File.CC BY · PubMed Central

Fig 4 Relationship between Ocean Health Index scores and potential predictor variables. Scores per region are compared to A) human development index (HDI) scores, B) country-level population (natural log-transformed), and C) country-level gross domestic product (GDP, natural log-transformed).CC BY · PubMed Central

Fig 5 Correlation matrix of per-country pairwise goal scores. Two-letter codes in the diagonal are goal labels (FP = food provision, AO = artisanal fishing opportunity, NP = natural products, CS = carbon storage, CP = coastal protection, LE = coastal livelihoods and economies, TR = tourism and recreation, SP = sense of place, CW = clean water, and BD = biodiversity). Values in the upper right are the correlation coefficients for each comparison, with larger font size indicating stronger significance of the result. Plots in lower left are scatterplots of the data with locally-weighted polynomial regression (LOWESS) fits shown in red.CC BY · PubMed Central

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Authors: Halpern, B. S., Longo, C., Lowndes, J. S. S., Best, B. D., Frazier, M., Katona, S. K., Kleisner, K. M., Rosenberg, A. A., Scarborough, C., & Selig, E. R.
Affiliations: University of California, Santa Barbara (US)
National Center for Ecological Analysis and Synthesis (US)
Duke University (US)
Conservation International (US)
University of British Columbia (CA)
Union of Concerned Scientists (US)
Corresponding author: Halpern, Benjamin S.
ORCID: Halpern, Benjamin S.
Longo, Catherine
Lowndes, Julia S. Stewart
Best, Benjamin D.
Frazier, Melanie
Katona, Steven K.
Kleisner, Kristin M.
Rosenberg, Andrew A.
Scarborough, Courtney
Selig, Elizabeth R.
Venue: PLOS ONE
Publisher: Public Library of Science (PLoS)
Published: 2015-03-16
Volume: 10
Issue: 3
Pages: e0117863
ISSN: 1932-6203 (ISSN-L)
DOI: 10.1371/journal.pone.0117863
PMC: PMC4361765
OpenAlex: W2163939760
Cited by: 139
References: 19
Citations by year: 2026: 7 · 2025: 11 · 2024: 14 · 2023: 15 · 2022: 10 · 2021: 16 · 2020: 10 · 2019: 14 · 2018: 12 · 2017: 15 · 2016: 8 · 2015: 6
FWCI: 38.51
Type: journal article
Language: en
Open access: gold
doi.org
Licence: cc-by
creativecommons.org/licenses/by/4.0/ (vor)
Locations: PLoS ONE (publishedVersion, cc-by)
Europe PMC (PubMed Central) (publishedVersion, cc-by)
PubMed Central (publishedVersion, cc-by)
PubMed (publishedVersion)
DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
eScholarship (California Digital Library) (submittedVersion)
eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders: David and Lucile Packard Foundation
Oak Foundation
National Geographic Society
Topics: Physical Sciences › Environmental Science › Management, Monitoring, Policy and Law › Coastal and Marine Management
Physical Sciences › Environmental Science › Management, Monitoring, Policy and Law › Sustainable Development and Environmental Policy
Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Marine and fisheries research
Keywords: Ocean Health Index, ocean health, marine ecosystem health, coastal countries, marine policy, coastal economy, natural products
MeSH terms: Conservation of Natural Resources, Fisheries, Oceans and Seas, Ecosystem, Internationality, Ecological and Environmental Phenomena

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