Ecological monitoring data of restored seagrass planted in North Wales between 2023–2025 by Project Seagrass
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
is part of: https://doi.pangaea.de/10.1594/PANGAEA.996148
additional type: dataset
description: This dataset was collected 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). It provides intertidal quadrat survey data recording seagrass shoot and reproductive shoot density, rhizome presence, canopy height, percentage cover of seagrass, epiphytes and algae, and sediment redox potential, pH and temperature, collected during repeated monitoring visits to four restored seagrass sites between June 2023 and October 2025.
abstract: This dataset was collected 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). It provides intertidal quadrat survey data recording seagrass shoot and reproductive shoot density, rhizome presence, canopy height, percentage cover of seagrass, epiphytes and algae, and sediment redox potential, pH and temperature, collected during repeated monitoring visits to four restored seagrass sites between June 2023 and October 2025.
citation: Marine heat waves endanger the rebuilding of marine life
spatial coverage: Place
  geo: GeoShape
    box: 52.866446 -4.587140999999974 53.320517 -4.3208230000000185
temporal coverage: 2023-06-04T00:00:00/2025-10-08T00:00:00
funding: MonetaryGrant
  funder: Natural Environment Research Council
funding: MonetaryGrant
  funder: The National Lottery Heritage Fund
size: QuantitativeValue
  value: 6936.0
  unit text: data points
variable measured: Event label
variable measured: Latitude of event
variable measured: Longitude of event
variable measured: Date/Time of event
variable measured: Date/Time of event 2
variable measured: Type of study
  type: PropertyValue
  subject of: DefinedTermSet
    has defined term: type
variable measured: DEPTH, water
  type: PropertyValue
  unit text: m
  subject of: DefinedTermSet
    has defined term: depth
    has defined term: water
    has defined term: Length
variable measured: DATE/TIME
  type: PropertyValue
  description: Date of the monitoring/survey visit
  subject of: DefinedTermSet
    has defined term: Time
variable measured: Principal investigator
variable measured: Identification
variable measured: Project
variable measured: Site
  type: PropertyValue
  subject of: DefinedTermSet
    has defined term: site
variable measured: Site index code
variable measured: Planting method
variable measured: Planted (yes/no)
variable measured: Monitoring identification
variable measured: Month
  type: PropertyValue
  subject of: DefinedTermSet
    has defined term: month
variable measured: Year of observation
  type: PropertyValue
  unit text: a AD
  subject of: DefinedTermSet
    has defined term: year
    has defined term: Time
variable measured: Monitoring method
variable measured: Sampling strategy
variable measured: Monitoring area
  type: PropertyValue
  unit text: m**2
  subject of: DefinedTermSet
    has defined term: Area
variable measured: Condition
  type: PropertyValue
  description: Intertidal / subtidal
variable measured: Experimental plot
  type: PropertyValue
  description: Plot / transect
variable measured: Zostera marina, shoots
  type: PropertyValue
  unit text: #
  measurement technique: Manual quadrat count
  description: Observed
  subject of: DefinedTermSet
    has defined term: Zostera marina
    has defined term: Abundance or Count
variable measured: Zostera marina, shoots
  type: PropertyValue
  unit text: #/m**2
  measurement technique: Manual quadrat count
  subject of: DefinedTermSet
    has defined term: Zostera marina
    has defined term: Individual Density
variable measured: Depth, redox
  type: PropertyValue
  unit text: cm
  measurement technique: Ruler stick
  subject of: DefinedTermSet
    has defined term: depth
    has defined term: reduction oxidation interface
      type: DefinedTerm
      alternate name: RedOx
    has defined term: Length
variable measured: Worm casts
  type: PropertyValue
  unit text: #
  measurement technique: Manual quadrat count
  subject of: DefinedTermSet
    has defined term: Abundance or Count
variable measured: Worm casts
  type: PropertyValue
  unit text: #/m**2
  measurement technique: Manual quadrat count
  subject of: DefinedTermSet
    has defined term: Individual Density
variable measured: Canopy height
  type: PropertyValue
  unit text: cm
  measurement technique: Ruler stick
  description: 1
  subject of: DefinedTermSet
    has defined term: Length
variable measured: Canopy height
  type: PropertyValue
  unit text: cm
  measurement technique: Ruler stick
  description: 2
  subject of: DefinedTermSet
    has defined term: Length
variable measured: Canopy height
  type: PropertyValue
  unit text: cm
  measurement technique: Ruler stick
  description: 3
  subject of: DefinedTermSet
    has defined term: Length
variable measured: Epiphytes, cover
  type: PropertyValue
  unit text: %
  measurement technique: Visual estimation
  subject of: DefinedTermSet
    has defined term: Dimensionless Ratio
variable measured: Algae, cover
  type: PropertyValue
  unit text: %
  measurement technique: Visual estimation
  subject of: DefinedTermSet
    has defined term: Dimensionless Ratio
variable measured: Blackening
  type: PropertyValue
  unit text: %
  measurement technique: Visual estimation
  subject of: DefinedTermSet
    has defined term: Dimensionless Ratio
variable measured: Bleaching
  type: PropertyValue
  unit text: %
  measurement technique: Visual estimation
  subject of: DefinedTermSet
    has defined term: Dimensionless Ratio
variable measured: Oxidation reduction (RedOx) potential
  type: PropertyValue
  unit text: mV
  measurement technique: Multiparameter probe, HANNA Instruments, HI-98191
  description: Sediment
  subject of: DefinedTermSet
    has defined term: reduction oxidation interface
      type: DefinedTerm
      alternate name: RedOx
    has defined term: Electric Flux
variable measured: pH
  type: PropertyValue
  measurement technique: Multiparameter probe, HANNA Instruments, HI-98191
  description: Sediment
variable measured: Sediment surface temperature
  type: PropertyValue
  unit text: °C
  measurement technique: Multiparameter probe, HANNA Instruments, HI-98191
  subject of: DefinedTermSet
    has defined term: Temperature
variable measured: Lithology/composition/facies
variable measured: Sea level, relative
  type: PropertyValue
  unit text: m
  subject of: DefinedTermSet
    has defined term: relative
    has defined term: Length
variable measured: Accuracy, vertical
  type: PropertyValue
  unit text: cm
  measurement technique: Global Positioning System (GPS), Garmin, GPSmap 60 CSx
  description: dGPS
  subject of: DefinedTermSet
    has defined term: vertical
    has defined term: Length
variable measured: Comment
variable measured: Monitoring reference database
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: data matrix.tab
distribution: FileObject

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

Natural Environment Research Council
type: Organization
alternate name: NERC

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

depth
type: DefinedTerm

water
type: DefinedTerm

Length
type: DefinedTerm
alternate name: L

Time
type: DefinedTerm
alternate name: T

Area
type: DefinedTerm

Zostera marina
type: DefinedTerm

Dimensionless Ratio
type: DefinedTerm
alternate name: ψ

Electric Flux
type: DefinedTerm

Temperature
type: DefinedTerm
alternate name: Θ

vertical
type: DefinedTerm

data matrix.tab
type: FileObject
type: DataDownload
encoding format: text/tab-separated-values

Comment
type: PropertyValue

Monitoring reference database
type: PropertyValue

FileObject
type: DataDownload
encoding format: text/html