This dataset has been developed to determine where there are suitable environmental conditions for native oyster restoration . It has been developed as part of the Wales Native Oyster Action Plan.

The dataset builds upon work carried out by ABPMer for Natural Resources Wales (NRW) with additional work by NRW. It is a composite dataset of suitable physical parameters and suitable habitat for oysters to live. This includes current energy <130nm-2, water depths of under 80m and subtidal mixed, coarse or macrophyte dominated sediments. Inshore areas were added where the model input layers were too coarse and the areas were considered suitable by NRW specialists.

It is important to note that the native oyster potential restoration areas have been produced using environmental variables only. Consideration has not been given to any human induced environmental (e.g. climate change, overexploitation, pollution etc.) or human capacity constraints (e.g. seabed use, licences, regulations and policies etc.) that may impact any restoration efforts. The outputs therefore represent a starting point in which to focus effort, with a view that further investigations will need to be undertaken before proceeding with a plan or project to restore or create native oyster habitat in any given location.

Further work is being carried out by NRW in partnership with others to determine where these possible areas might be refined into more feasible as part of a wider work stream to deliver enhanced resilience of Welsh seas in line with the Environment Act objectives and Section 6 duty (‘to maintain and enhance resilience of ecosystems’). The wider programme will focus on co-development of tools including narratives, maps and data that identify and communicate where and what the most significant opportunities are to enhance the resilience of marine and coastal ecosystems in Wales.

Only a redacted version of this data is available under the Open Governance Licence and available for public use, see Limitation on Public Access and Use Constraints.

Datblygwyd y set ddata hon i benderfynu a oes amodau amgylcheddol addas ar gyfer adfer wystrys brodorol. Fe'i datblygwyd fel rhan o Gynllun Gweithredu Wystrys Brodorol Cymru.

Mae'r set ddata yn adeiladu ar waith a wnaed gan ABPMer i Cyfoeth Naturiol Cymru (CNC) ynghyd â gwaith ychwanegol gan CNC. Mae'n set ddata gyfansawdd o baramedrau ffisegol addas a chynefin addas i wystrys fyw ynddo. Mae hyn yn cynnwys ynni cyfredol <130nm-2, dyfnderoedd dŵr o dan 80m a gwaddodion is-lanwol cymysg, bras neu wedi’u domiynyddu gan facroffytau. Ychwanegwyd ardaloedd y glannau lle roedd yr haenau mewnbwn model yn rhy fras ac ystyriwyd bod yr ardaloedd yn addas gan arbenigwyr CNC.

Mae ffynonellau data yn cynnwys EMODNet (ynni cyfredol), GEBCO (bathymetreg y DU) a map cyfunol JNCC UKASH.

Mae'n bwysig nodi bod yr ardaloedd posibl ar gyfer adfer wystrys brodorol wedi'u cynhyrchu gan ddefnyddio newidynnau amgylcheddol yn unig. Ni roddwyd ystyriaeth i unrhyw gyfyngiadau amgylcheddol a achoswyd gan ddyn (e.e. newid hinsawdd, gor-ecsbloetio, llygredd ac ati) na chyfyngiadau capasiti dynol (e.e. defnyddio gwely'r môr, trwyddedau, rheoliadau a pholisïau ac ati) a allai effeithio ar unrhyw ymdrechion i adfer. Felly mae'r allbynnau'n cynrychioli man cychwyn er mwyn canolbwyntio ymdrechion, gyda'r bwriad y bydd angen cynnal ymchwiliadau pellach cyn bwrw ymlaen â chynllun neu brosiect i adfer neu greu cynefin wystrys brodorol mewn unrhyw leoliad penodol.

Mae gwaith pellach yn cael ei wneud gan CNC mewn partneriaeth ag eraill i benderfynu ymhle y gellid mireinio'r ardaloedd posibl hyn i fod yn fwy ymarferol fel rhan o ffrwd waith ehangach i sicrhau gwell cydnerthedd i foroedd Cymru yn unol ag amcanion Deddf yr Amgylchedd a dyletswydd Adran 6 (i ‘gynnal a gwella cydnerthedd ecosystemau'). Bydd y rhaglen ehangach yn canolbwyntio ar gyd-ddatblygu offer gan gynnwys naratifau, mapiau a data sy'n nodi ac yn cyfleu ble a beth yw'r cyfleoedd mwyaf arwyddocaol i wella cydnerthedd ecosystemau morol ac arfordirol yng Nghymru.

Datganiad priodoli: Yn cynnwys gwybodaeth Cyfoeth Naturiol Cymru © Cyfoeth Naturiol Cymru a Chronfa Ddata Hawl. Cedwir pob hawl. Mae hyn yn cynnwys rhywfaint o wybodaeth sy’n seiliedig ar ddata a ddarparwyd gan: © Yr Undeb Ewropeaidd, 1995-2026. Hawlfraint © 2020-2026, GEBCO. © JNCC a darparwyr data eraill, fel yr amlinellir yn eu rhestr ddata.