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Historical Analysis Exposes Catastrophic Seagrass Loss for the United Kingdom

Alix E. Green, Richard Unsworth Orcid Logo, Michael A. Chadwick, Peter J. S. Jones

Frontiers in Plant Science, Volume: 12

Swansea University Author: Richard Unsworth Orcid Logo

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Abstract

The spatial extent of seagrass is poorly mapped, and knowledge of historical loss is limited. Here, we collated empirical and qualitative data using systematic review methods to provide unique analysis on seagrass occurrence and loss in the United Kingdom. We document 8,493 ha of recently mapped sea...

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Published in: Frontiers in Plant Science
ISSN: 1664-462X
Published: Frontiers Media SA 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa60381
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Abstract: The spatial extent of seagrass is poorly mapped, and knowledge of historical loss is limited. Here, we collated empirical and qualitative data using systematic review methods to provide unique analysis on seagrass occurrence and loss in the United Kingdom. We document 8,493 ha of recently mapped seagrass in the United Kingdom since 1998. This equates to an estimated 0.9 Mt of carbon, which, in the current carbon market represents about £22 million. Using simple models to estimate seagrass declines triangulated against habitat suitability models, we provide evidence of catastrophic seagrass loss; at least 44% of United Kingdom’s seagrasses have been lost since 1936, 39% since the 1980’s. However, losses over longer time spans may be as high as 92%. Based on these estimates, historical seagrass meadows could have stored 11.5 Mt of carbon and supported approximately 400 million fish. Our results demonstrate the vast scale of losses and highlight the opportunities to restore seagrass to support a range of ecosystems services.
Keywords: blue carbon, ecosystem change, habitat loss, intertidal, historic change, marine, shifting baselinesyndrome, Zostera spp
College: Faculty of Science and Engineering
Funders: This work was funded by the Natural Environmental Research Council (AG grant number NE/L002485/1.