Decadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series

Seagrass meadows are monitored in the frame of several environmental programs worldwide, including the Water Framework Directive (WFD), to evaluate the ecological status of European coastal and transitional water bodies. The large size, spatial complexity, and interannual variability of seagrass eco...

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Autores principales:	Maria Laura Zoffoli, Pierre Gernez, Laurent Godet, Steef Peters, Simon Oiry, Laurent Barillé
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Water Framework Directive Interannual variability Ecosystem monitoring Earth Observation Recovery Zostera noltei Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/d2dfb4abdde6474b81be90d486aa2b7e
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spelling	oai:doaj.org-article:d2dfb4abdde6474b81be90d486aa2b7e2021-12-01T04:58:18ZDecadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series1470-160X10.1016/j.ecolind.2021.108033https://doaj.org/article/d2dfb4abdde6474b81be90d486aa2b7e2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21006981https://doaj.org/toc/1470-160XSeagrass meadows are monitored in the frame of several environmental programs worldwide, including the Water Framework Directive (WFD), to evaluate the ecological status of European coastal and transitional water bodies. The large size, spatial complexity, and interannual variability of seagrass ecosystems significantly challenge field monitoring. In this study, a multi-mission satellite time-series was used to estimate long-term changes in seagrass status in a macrotidal system dominated by Zostera noltei, at Bourgneuf Bay (French Atlantic coast). Metrics of seagrass extent and density were obtained from Earth Observation (EO) using validated and inter-calibrated Landsat, SPOT and Sentinel2 data from 1985 to 2020. The information provided by satellite data made it possible to compute and compare several seagrass indicators currently in use in several European countries (France, Portugal and UK) within the WFD. Both the seagrass extent and meadow-averaged density displayed increasing trends since 1985. A time-series of merged observations from various satellites revealed a high degree of interannual variability in seagrass extent, with abrupt losses (up to 50% within one year) alternating with periods of slow recovery (typically 4–6 years). The seagrass meadow which was in a moderate status (sensu the WFD) in the 1980s, achieved an overall recurrent good or high status since the mid-1990s. Altogether, the methods and results presented here demonstrated that EO is a reliable source of information for mapping and assessing the status of intertidal seagrass, complementing in situ measurements by providing long-term, spatial view and standardized observation framework. We recommend the systematic use of EO time-series in complement to traditional field measurements in seagrass monitoring programs such as the WFD.Maria Laura ZoffoliPierre GernezLaurent GodetSteef PetersSimon OiryLaurent BarilléElsevierarticleWater Framework DirectiveInterannual variabilityEcosystem monitoringEarth ObservationRecoveryZostera nolteiEcologyQH540-549.5ENEcological Indicators, Vol 130, Iss , Pp 108033- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Water Framework Directive Interannual variability Ecosystem monitoring Earth Observation Recovery Zostera noltei Ecology QH540-549.5
spellingShingle	Water Framework Directive Interannual variability Ecosystem monitoring Earth Observation Recovery Zostera noltei Ecology QH540-549.5 Maria Laura Zoffoli Pierre Gernez Laurent Godet Steef Peters Simon Oiry Laurent Barillé Decadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series
description	Seagrass meadows are monitored in the frame of several environmental programs worldwide, including the Water Framework Directive (WFD), to evaluate the ecological status of European coastal and transitional water bodies. The large size, spatial complexity, and interannual variability of seagrass ecosystems significantly challenge field monitoring. In this study, a multi-mission satellite time-series was used to estimate long-term changes in seagrass status in a macrotidal system dominated by Zostera noltei, at Bourgneuf Bay (French Atlantic coast). Metrics of seagrass extent and density were obtained from Earth Observation (EO) using validated and inter-calibrated Landsat, SPOT and Sentinel2 data from 1985 to 2020. The information provided by satellite data made it possible to compute and compare several seagrass indicators currently in use in several European countries (France, Portugal and UK) within the WFD. Both the seagrass extent and meadow-averaged density displayed increasing trends since 1985. A time-series of merged observations from various satellites revealed a high degree of interannual variability in seagrass extent, with abrupt losses (up to 50% within one year) alternating with periods of slow recovery (typically 4–6 years). The seagrass meadow which was in a moderate status (sensu the WFD) in the 1980s, achieved an overall recurrent good or high status since the mid-1990s. Altogether, the methods and results presented here demonstrated that EO is a reliable source of information for mapping and assessing the status of intertidal seagrass, complementing in situ measurements by providing long-term, spatial view and standardized observation framework. We recommend the systematic use of EO time-series in complement to traditional field measurements in seagrass monitoring programs such as the WFD.
format	article
author	Maria Laura Zoffoli Pierre Gernez Laurent Godet Steef Peters Simon Oiry Laurent Barillé
author_facet	Maria Laura Zoffoli Pierre Gernez Laurent Godet Steef Peters Simon Oiry Laurent Barillé
author_sort	Maria Laura Zoffoli
title	Decadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series
title_short	Decadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series
title_full	Decadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series
title_fullStr	Decadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series
title_full_unstemmed	Decadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series
title_sort	decadal increase in the ecological status of a north-atlantic intertidal seagrass meadow observed with multi-mission satellite time-series
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/d2dfb4abdde6474b81be90d486aa2b7e
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Decadal increase in the ecological status of a North-Atlantic intertidal seagrass meadow observed with multi-mission satellite time-series

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