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Frontiers in Marine Science
Article . 2022 . Peer-reviewed
License: CC BY
Data sources: Crossref
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Frontiers in Marine Science
Article . 2022
Data sources: DOAJ
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Article . 2022 . Peer-reviewed
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Seagrass Thermal Limits and Vulnerability to Future Warming

Authors: orcid Núria Marbà;
Núria Marbà
ORCID
Harvested from ORCID Public Data File

Núria Marbà in OpenAIRE
orcid Gabriel Jordà;
Gabriel Jordà
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Harvested from ORCID Public Data File

Gabriel Jordà in OpenAIRE
orcid Scott Bennett;
Scott Bennett
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Harvested from ORCID Public Data File

Scott Bennett in OpenAIRE
Scott Bennett; orcid Carlos M. Duarte;
Carlos M. Duarte
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Harvested from ORCID Public Data File

Carlos M. Duarte in OpenAIRE

Seagrass Thermal Limits and Vulnerability to Future Warming

Abstract

Seagrasses have experienced major losses globally mostly attributed to human impacts. Recently they are also associated with marine heat waves. The paucity of information on seagrass mortality thermal thresholds prevents the assessment of the risk of seagrass loss under marine heat waves. We conducted a synthesis of reported empirically- or experimentally-determined seagrass upper thermal limits (Tlimit) and tested the hypothesis that they increase with increasing local annual temperature. We found that Tlimit increases 0.42± 0.07°C per°C increase in in situ annual temperature (R2 = 0.52). By combining modelled seagrass Tlimit across global coastal areas with current and projected thermal regimes derived from an ocean reanalysis and global climate models (GCMs), we assessed the proximity of extant seagrass meadows to their Tlimit and the time required for Tlimit to be met under high (RCP8.5) and moderate (RCP4.5) emission scenarios of greenhouse gases. Seagrass meadows worldwide showed a modal difference of 5°C between present Tmax and seagrass Tlimit. This difference was lower than 3°C at the southern Red Sea, the Arabian Gulf, the Gulf of Mexico, revealing these are the areas most in risk of warming-derived seagrass die-off, and up to 24°C at high latitude regions. Seagrasses could meet their Tlimit regularly in summer within 50-60 years or 100 years under, respectively, RCP8.5 or RCP4.5 scenarios for the areas most at risk, to more than 200 years for the Arctic under both scenarios. This study shows that implementation of the goals under the Paris Agreement would safeguard much of global seagrass from heat-derived mass mortality and identifies regions where actions to remove local anthropogenic stresses would be particularly relevant to meet the Target 10 of the Aichi Targets of the Convention of the Biological Diversity.

Countries
Saudi Arabia, Spain, Saudi Arabia
Keywords

Take urgent action to combat climate change and its impacts, seagrass, Science, Growth, QH1-199.5, Heat waves, Climate change, Mortality, Seagrass, Ensure healthy lives and promote well-being for all at all ages, Temperatures, Q, thresholds, temperature, General. Including nature conservation, geographical distribution, mortality, //metadata.un.org/sdg/3 [http], climate change, Thresholds, heat waves

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