Spatial, Light, Temperature and Seagrass Planting and Monitoring record data from North Wales 2023-2024
type: Dataset
conforms to: http://mlcommons.org/croissant/1.0
creator: Oliver Robert Thomas
creator: Richard K F Unsworth
  type: Person
  family name: Unsworth
  given name: Richard K F
  affiliation: Swansea University
publisher: PANGAEA
  type: Organization
  disambiguating description: Data Publisher for Earth & Environmental Science
included in data catalog: PANGAEA
  type: DataCatalog
  disambiguating description: Data Publisher for Earth & Environmental Science
date published: 2026-07-24
additional type: dataset bundled publication
description: This data package contains restoration, monitoring and in-situ environmental data collected between February 2023 and October 2025 in support of a study on the resilience of restored seagrass (Zostera marina) meadows to marine heatwave exposure in North Wales, United Kingdom (Thomas et al., 2026). Seagrass was planted at four intertidal sites along the Llŷn Peninsula and Ynys Môn using directly injected seeds, hessian bags and seed balls; planting locations were surveyed with a differential Global Positioning System (dGPS) receiver, producing spatial point and polygon records of the planted areas. Restoration success was subsequently assessed through repeated intertidal quadrat surveys recording shoot and reproductive shoot density, rhizome presence, canopy height, percentage cover of seagrass, epiphytes and algae, and sediment redox potential, pH and temperature, measured using a portable multiparameter meter. In-situ seawater/intertidal temperature and light intensity were additionally recorded at 30-minute intervals over one month in May 2024 using a fixed temperature/light data logger. These restoration and monitoring records were combined with satellite-derived sea surface temperature and marine heatwave indicator data from the E.U. Copernicus Marine Service (doi:10.48670/moi-00054, doi:10.48670/moi-00055) to evaluate how marine heatwave exposure affected the establishment and persistence of a restored seagrass meadow. The package comprises four data types - in-situ light and temperature logger data, spatial point and polygon data of planting locations, seagrass planting records, and seagrass monitoring records - each published here as an individual dataset.
abstract: This data package contains restoration, monitoring and in-situ environmental data collected between February 2023 and October 2025 in support of a study on the resilience of restored seagrass (Zostera marina) meadows to marine heatwave exposure in North Wales, United Kingdom (Thomas et al., 2026). Seagrass was planted at four intertidal sites along the Llŷn Peninsula and Ynys Môn using directly injected seeds, hessian bags and seed balls; planting locations were surveyed with a differential Global Positioning System (dGPS) receiver, producing spatial point and polygon records of the planted areas. Restoration success was subsequently assessed through repeated intertidal quadrat surveys recording shoot and reproductive shoot density, rhizome presence, canopy height, percentage cover of seagrass, epiphytes and algae, and sediment redox potential, pH and temperature, measured using a portable multiparameter meter. In-situ seawater/intertidal temperature and light intensity were additionally recorded at 30-minute intervals over one month in May 2024 using a fixed temperature/light data logger. These restoration and monitoring records were combined with satellite-derived sea surface temperature and marine heatwave indicator data from the E.U. Copernicus Marine Service (doi:10.48670/moi-00054, doi:10.48670/moi-00055) to evaluate how marine heatwave exposure affected the establishment and persistence of a restored seagrass meadow. The package comprises four data types - in-situ light and temperature logger data, spatial point and polygon data of planting locations, seagrass planting records, and seagrass monitoring records - each published here as an individual dataset.
citation: Marine heat waves endanger the rebuilding of marine life
citation: Atlantic - European North West Shelf - Ocean Physics Analysis and Forecast
citation: Atlantic - European North West Shelf - Ocean Wave Analysis and Forecast
spatial coverage: Place
  geo: GeoShape
    box: 52.86612995 -4.587140999999974 53.320517 -4.319450833000019
temporal coverage: 2023-02-20T00:00:00/2025-10-08T00:00:00
funding: MonetaryGrant
  funder: Natural Environment Research Council
funding: MonetaryGrant
  funder: The National Lottery Heritage Fund
size: QuantitativeValue
  value: 5.0
  unit text: datasets
keywords: Field experiment; In-situ; Monitoring; restoration
license: https://creativecommons.org/licenses/by/4.0/
conditions of access: unrestricted
is accessible for free: true
language: en
distribution: FileObject
  type: DataDownload
  encoding format: application/zip

Oliver Robert Thomas
type: Person
family name: Thomas
given name: Oliver Robert

Swansea University
type: Organization

Marine heat waves endanger the rebuilding of marine life
type: CreativeWork
type: ScholarlyArticle
creator: Oliver Robert Thomas
creator: Bridget M Patterson
creator: Caroline Rowland
  type: Person
  family name: Rowland
  given name: Caroline
creator: Ségolène Berthou
creator: Mark Worsfold
creator: Emily Yates
creator: Charlotte Keen
  type: Person
  family name: Keen
  given name: Charlotte
creator: Stijn den Haan
  type: Person
  family name: den Haan
  given name: Stijn
creator: Richard K F Unsworth
  type: Person
  family name: Unsworth
  given name: Richard K F
date published: 2026
pagination: 104019
is part of: Environmental Research Letters
  type: Periodical
  type: PublicationVolume
  volume number: 21(10)
additional type: journal article

Bridget M Patterson
type: Person
family name: Patterson
given name: Bridget M

Ségolène Berthou
type: Person
family name: Berthou
given name: Ségolène

Mark Worsfold
type: Person
family name: Worsfold
given name: Mark

Emily Yates
type: Person
family name: Yates
given name: Emily

Atlantic - European North West Shelf - Ocean Physics Analysis and Forecast
type: CreativeWork
type: Dataset
date published: 2018
source organization: Mercator Ocean International
additional type: dataset

Atlantic - European North West Shelf - Ocean Wave Analysis and Forecast
type: CreativeWork
type: Dataset
date published: 2019
source organization: Mercator Ocean International
additional type: dataset

Natural Environment Research Council
type: Organization
alternate name: NERC

The National Lottery Heritage Fund
type: Organization
alternate name: HLF