Thomas Oliver Robert ollie@projectseagrass.org 0009-0000-1636-9492 Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Swansea University https://www.swansea.ac.uk https://ror.org/053fq8t95 2026 Ecological monitoring data of restored seagrass planted in North Wales between 2023–2025 by Project Seagrass dataset https://doi.pangaea.de/10.1594/PANGAEA.996141 2026-07-24T12:14:18 https://doi.pangaea.de/10.1594/PANGAEA.996148 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. Thomas Oliver Robert ollie@projectseagrass.org 0009-0000-1636-9492 Patterson Bridget M 0009-0000-8621-2247 Rowland Caroline Berthou Ségolène 0000-0002-9164-0841 Worsfold Mark 0000-0003-0722-4456 Yates Emily 0009-0000-0776-4466 Keen Charlotte den Haan Stijn Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk 2026 Marine heat waves endanger the rebuilding of marine life journal article Environmental Research Letters 21(10) https://doi.org/10.1088/1748-9326/ae6d17 104019 -4.587140999999974 -4.3208230000000185 52.866446 53.320517 -4.48706199999998 53.098918999999995 2023-06-04T00:00:00 2025-10-08T00:00:00 0.0 0.0 time series SORNW Seagrass Ocean Rescue North Wales https://www.wwf.org.uk/what-we-do/projects/north-wales-seagrass-ocean-rescue World Wide Fund for Nature International WWF http://www.wwf.org/ https://ror.org/001pprn90 Natural Environment Research Council NERC http://www.nerc.ac.uk/ https://doi.org/10.13039/501100000270 NE/V016385/1 The National Lottery Heritage Fund HLF https://www.heritagefund.org.uk/ https://doi.org/10.13039/501100016135 NL-21-00035 NWMHWOTRU2026_CYD_monitoring Carreg y Defaid (CYD) 52.866446 -4.463013 2023-06-04T00:00:00 2024-09-18T00:00:00 Field experiment Intertidal zone / mean sea level NWMHWOTRU2026_PHD_monitoring Penrhos Headland (PHD) 53.305035 -4.587141 2024-10-16T00:00:00 2025-10-06T00:00:00 Field experiment Intertidal zone / mean sea level NWMHWOTRU2026_PYC_monitoring Pen-y-Chain (PYC) 52.903678 -4.320823 2023-06-05T00:00:00 2024-09-20T00:00:00 Field experiment Merged Pen-y-Chain site (former East/West plots); midpoint coordinate; intertidal zone / mean sea level NWMHWOTRU2026_PYN_monitoring Penrhyn (PYN) 53.320517 -4.577271 2024-10-17T00:00:00 2025-10-08T00:00:00 Field experiment Intertidal zone / mean sea level 6936 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Event label Event Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Event Latitude of event Latitude Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Latitude Longitude of event Longitude Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Longitude Date/Time of event Date/Time Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Date/Time Date/Time of event 2 Date/Time 2 Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Date/Time 2 Type of study Study type type Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Study type DEPTH, water Depth water m depth http://purl.obolibrary.org/obo/PATO_0001595 water http://purl.obolibrary.org/obo/CHEBI_15377 Length L http://dbpedia.org/resource/Length Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Depth water [m] DATE/TIME Date/Time http://en.wikipedia.org/wiki/ISO_8601 Time T http://dbpedia.org/resource/Time Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Date of the monitoring/survey visit Date/Time (Date of the monitoring/survey...) Principal investigator PI Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk PI Identification ID Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk ID Project Project Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Project Site Site site Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Site Site index code Site ind Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Site ind Planting method Plant method Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Plant method Planted (yes/no) Planted (y/n) Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Planted (y/n) Monitoring identification Monitoring ID Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Monitoring ID Month Month month Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Month Year of observation Year obs a AD year Time T http://dbpedia.org/resource/Time Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Year obs [a AD] Monitoring method Monitor method Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Monitor method Sampling strategy Sampling strat Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Sampling strat Monitoring area Monitoring area m**2 Area http://dbpedia.org/resource/Area Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Monitoring area [m**2] Condition Cond Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Intertidal / subtidal Cond (Intertidal / subtidal) Experimental plot Experimental plot Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Plot / transect Experimental plot (Plot / transect) Zostera marina, shoots Z. marina shoots # Zostera marina https://www.marinespecies.org/aphia.php?p=taxdetails&id=495077 Abundance or Count Manual quadrat count Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Observed Z. marina shoots [#] (Observed, Manual quadrat count) Zostera marina, shoots Z.marina shoots #/m**2 Zostera marina https://www.marinespecies.org/aphia.php?p=taxdetails&id=495077 Individual Density Manual quadrat count Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Z.marina shoots [#/m**2] (Manual quadrat count) Depth, redox Depth redox cm depth http://purl.obolibrary.org/obo/PATO_0001595 reduction oxidation interface RedOx Length L http://dbpedia.org/resource/Length Ruler stick RULER Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Depth redox [cm] (Ruler stick) Worm casts Worm casts # Abundance or Count Manual quadrat count Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Worm casts [#] (Manual quadrat count) Worm casts Worm casts #/m**2 Individual Density Manual quadrat count Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Worm casts [#/m**2] (Manual quadrat count) Canopy height Canopy h cm Length L http://dbpedia.org/resource/Length Ruler stick RULER Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk 1 Canopy h [cm] (1, Ruler stick) Canopy height Canopy h cm Length L http://dbpedia.org/resource/Length Ruler stick RULER Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk 2 Canopy h [cm] (2, Ruler stick) Canopy height Canopy h cm Length L http://dbpedia.org/resource/Length Ruler stick RULER Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk 3 Canopy h [cm] (3, Ruler stick) Epiphytes, cover Epiphytes cov % Dimensionless Ratio ψ Visual estimation Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Epiphytes cov [%] (Visual estimation) Algae, cover Algae cov % Dimensionless Ratio ψ Visual estimation Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Algae cov [%] (Visual estimation) Blackening Blackening % Dimensionless Ratio ψ Visual estimation Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Blackening [%] (Visual estimation) Bleaching Bleaching % Dimensionless Ratio ψ Visual estimation Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Bleaching [%] (Visual estimation) Oxidation reduction (RedOx) potential Eh mV https://en.wikipedia.org/wiki/Reduction_potential reduction oxidation interface RedOx Electric Flux http://dbpedia.org/resource/Electric_flux Multiparameter probe, HANNA Instruments, HI-98191 Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Sediment Eh [mV] (Sediment, Multiparameter prob...) pH pH Multiparameter probe, HANNA Instruments, HI-98191 Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Sediment pH (Sediment, Multiparameter prob...) Sediment surface temperature Sed surf temp °C Temperature Θ http://dbpedia.org/resource/Temperature Multiparameter probe, HANNA Instruments, HI-98191 Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Sed surf temp [°C] (Multiparameter probe, HANNA I...) Lithology/composition/facies Lithology Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Lithology Sea level, relative Sea lev rel m relative Length L http://dbpedia.org/resource/Length Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Sea lev rel [m] Accuracy, vertical Accuracy V cm vertical http://purl.obolibrary.org/obo/PATO_0001854 Length L http://dbpedia.org/resource/Length Global Positioning System (GPS), Garmin, GPSmap 60 CSx Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk dGPS Accuracy V [cm] (dGPS, Global Positioning Syst...) Comment Comment Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Comment Monitoring reference database Monitoring DB Unsworth Richard K F r.k.f.unsworth@swansea.ac.uk Monitoring DB CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels Field experiment In-situ Monitoring restoration author106706 author118504 author118506 author118507 author118508 author118509 author118510 author118511 author118512 award5164 award5167 curlevel30 event3420976 event3420977 event3420978 event3420979 funder1797 funder22897 geocode1599 geocode1600 geocode1601 geocode1619 inst22896 inst2617 journal5064 license21 method12443 method12831 method19056 method19451 method19452 method4760 param102259 param132665 param141184 param145013 param150355 param155369 param15652 param1570 param165674 param168472 param184731 param185520 param2834 param47 param48491 param500828 param505000 param533102 param567431 param567433 param567434 param567435 param567436 param567437 param567438 param567439 param567443 param567444 param567445 param567449 param567450 param7056 param764 param97989 pi106706 project5123 ref140776 term1068249 term1073131 term1073520 term2606205 term37810 term38842 term41032 term41076 term42421 term43770 term43794 term43814 term43863 term43972 term43975 term44022 term44025 term47611 term47766 term49506 term50572 term52587 topotype8