Coleg Gwyddoniaeth a Pheirianneg

  1. Erthygl › Ymchwil › Adolygwyd gan gymheiriaid
  2. Cyhoeddwyd

    Weak effects of geolocators on small birds: a meta-analysis controlled for phylogeny and publication bias

    Brlík, V., Koleček, J., Burgess, M., Hahn, S., Humple, D., Krist, M., Ouwehand, J., Weiser, E., Adamík, P., Alves, J., Arlt, D., Barišić, S., Becker, D., Belda, E., Beran, V., Both, C., Bravo, S., Briedis, M., Chutný, B., Ćiković, D., Cooper, N., Costa, J., Cueto, V., Emmenegger, T., Fraser, K., Gilg, O., Guerrero, M., Hallworth, M., Hewson, C., Johnson, J., Jiguet, F., Kelly, T., Kishkinev, D., Leconte, M., Lislevand, T., Lisovski, S., López, C., McFarland, K., Marra, P., Matsuoka, S., Matyjasiak, P., Meier, C., Metzger, B., Monrós, J., Neumann, R., Newman, A., Norris, R., Pärt, T., Pavel, V., Perlut, N., Piha, M., Reneerkens, J., Rimmer, C., Roberto-Charron, A., Scandolara, C., Sokolova, N., Takenaka, M., Tolkmitt, D., van Oosten, H., Wellbrock, A., Wheeler, H., van der Winden, J., Witte, K., Woodworth, B. & Procházka, P., Ion 2020, Yn: Journal of Animal Ecology. 89, 1, t. 207-220

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  3. Cyhoeddwyd

    Weak founder effect signal in a recent introduction of Caribbean Anolis

    Eales, J. F., Thorpe, R. & Malhotra, A., 5 Chwef 2008, Yn: Molecular Ecology. 17, 6, t. 1416-1426

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  4. Cyhoeddwyd

    Weak tides during Cryogenian glaciations

    Green, M., Davies, H., Duarte, J., Creveling, J. & Scotese, C., 4 Rhag 2020, Yn: Nature Communications. 11, 1, 6227.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  5. Cyhoeddwyd

    Weak-force detection with superposed coherent states.

    Munro, W. J., Nemoto, K., Milburn, G. J. & Braunstein, S. L., 1 Awst 2002, Yn: Physical Review A. 66, 2, t. 023819

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  6. Cyhoeddwyd

    Weakening of cold halocline layer exposes sea ice to oceanic heat in the eastern Arctic Ocean

    Polyakov, I., Rippeth, T., Fer, I., Alkire, M., Baumann, T., Carmack, E., Ivanov, V., Janout, M. A., Padman, L., Pnyushkov, A. & Rember, R., 15 Medi 2020, Yn: Journal of Climate. 33, 18, t. 8107-8123

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

    What agricultural practices are most likely to deliver "sustainable intensification" in the UK?

    Dicks, L., Rose, D., Ang, F., Birch, N., Boatman, N., Bowles, E., Chadwick, D., Dinsdale, A., Durham, S., Elliott, J., Firbank, L., Humphreys, S., Jarvis, P., Jones, D., Kindred, D., Knight, S., Lee, M., Leifert, C., Lobley, M., Matthews, K., Midmer, A., Moore, M., Morris, C., Mortimer, S., Murray, T., Norman, K., Ramsden, S., Roberts, D., Smith, L., Soffe, R., Stoate, C., Taylor, B., Tinker, D., Topliff, M., Wallace, J., Williams, P., Wilson, P., Winter, M. & Sutherland, W., Chwef 2019, Yn: Food and Energy Security. 8, 1, e00148.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. Cyhoeddwyd

    What are shared and social values of ecosystems?

    Kenter, J. O., O'Brien, L., Hockley, N., Ravenscroft, N., Fazey, I., Irvine, K. N., Reed, M. S., Christie, M., Brady, E., Bryce, R., Church, A., Cooper, N., Davies, A., Evely, A., Everard, M., Fish, R., Fisher, J. A., Jobstvogt, N., Molloy, C., Orchard-Webb, J., Ranger, S., Ryan, M., Watson, V. & Williams, S., 6 Chwef 2015, Yn: Ecological Economics. 111, t. 86-99

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  9. E-gyhoeddi cyn argraffu

    What bit the Ancient Egyptians? Niche modelling to identify the snakes described in the Brooklyn medical papyrus

    McBride, E., Winder, I. C. & Wüster, W., 7 Hyd 2023, (E-gyhoeddi cyn argraffu) Yn: Environmental Archaeology.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. Cyhoeddwyd

    What can local knowledge contribute to our understanding of tree species selection on coffee farms?

    Agaba, G., Sandbrook, L., Gassner, A. & Sinclair, F., 25 Awst 2016, Yn: Agriculture for Development. 28, t. 21-25

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    What can management option uptake tell us about ecosystem services delivery through agri-environment schemes?

    Arnott, D., Chadwick, D., Harris, I., Koj, A. & Jones, D. L., 1 Chwef 2019, Yn: Land Use Policy. 81, t. 194-208

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    What can seabirds tell us about the tide?

    Cooper, M., Bishop, C. M., Lewis, M., Bowers, D., Bolton, M., Owen, E. & Dodd, S., 29 Tach 2018, Yn: Ocean Science. 14, 6, t. 1483-1490 7 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  13. Cyhoeddwyd

    What can the abundance of Grey Parrots on Príncipe Island tell us about large parrot conservation?

    Valle, S., Collar, N. J., Melo, M. & Marsden, S. J., 2021, Yn: Journal of Tropical Ecology. 36, 6, t. 293- 297

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  14. Cyhoeddwyd

    What evidence exists on the impact of governance type on the conservation effectiveness of forest protected areas? Knowledge base and evidence gaps.

    Macura, B., Laura, S. & Pullin, A., 12 Rhag 2015, Yn: Environmental Evidence. 4, 24

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  15. Cyhoeddwyd

    What is rewilding, how should it be done, and why? A Q-method study of the views held by European rewilding advocates

    Holmes, G., Marriott, K., Briggs, C. & Wynne-Jones, S., Meh 2020, Yn: Conservation & Society. 18, 2, t. 77-88

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. Cyhoeddwyd

    What is the deal with the Green Deal: Will the new strategy help to improve European freshwater quality beyond the Water Framework Directive?

    Bierova, M., Glendell, M. & Bol, R., 15 Hyd 2021, Yn: Science of the Total Environment. 791, 148080.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  17. Cyhoeddwyd

    What is the role of the accessibility of wood hydroxyl groups in controlling moisture content?

    Rautkari, L., Hill, C. A., Curling, S. F., Jalaludin, Z. & Ormondroyd, G. A., 1 Medi 2013, Yn: Journal of Materials Science. 48, 18, t. 6352-6356

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    What role should null-hypothesis significance tests have in statistical education and hypothesis falsification?

    Gibbons, J. M., Crout, N. M. & Healey, J., 1 Medi 2007, Yn: Trends in Ecology and Evolution. 22, 9, t. 445-446

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    What role should randomized control trials play in providing the evidence base for conservation?

    Pynegar, E. L., Gibbons, J. M., Asquith, N. M. & Jones, J. P. G., Maw 2021, Yn: Oryx. 55, 2, t. 235-244

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    What's your poison?

    Wuster, W. & Wüster, W., 1 Meh 2010, Yn: Heredity. 104, 6, t. 519

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Wheat's wild relatives vary in their response to nitrogen and ozone.

    Brewster, C., Stevens, C. & McAinsh, M., 19 Awst 2018, Yn: Annals of Applied Biology. 173, 2, t. 154-163 10 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    When One Health Meets the United Nations Ocean Decade: Global Agendas as a Pathway to Promote Collaborative Interdisciplinary Research on Human-Nature Relationships

    Masterson Algar, P., Jenkins, S., Windle, G., Morris-Webb, E., Takahashi, C. K., Burke, T., Rosa, I., Martinez, A. S., Torres-Mattos, E. B., Taddei, R., Morrison, V., Kasten, P., Bryning, L., Cruz de Oliveira, N. R., Gonçalves, L. R., Skov, M., Beynon-Davies, C., Bumbeer, J., Saldiva, P. H. N., Leão, E. & Christofoletti, R., 6 Ebr 2022, Yn: Frontiers in Psychology. 13, 809009.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Cyhoeddwyd

    When continents collide: Phylogeny, historical biogeography and systematics of the medically important viper genus Echis (Squamata: Serpentes: Viperidae).

    Wuster, W., Pook, C. E., Joger, U., Stumpel, N. & Wüster, W., 1 Rhag 2009, Yn: Molecular Phylogenetics and Evolution. 53, 3, t. 792-807

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  24. Cyhoeddwyd

    When fish shoals meet: outcomes for evolution and fisheries

    Croft, D. P., Krause, J., Couzin, I. D. & Pitcher, T. J., 1 Meh 2003, Yn: Fish and Fisheries. 4, 2, t. 138-146

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  25. Cyhoeddwyd

    When heat casts a spell on the DNA damage checkpoints

    Caspari, T. M., Turner, T. & Caspari, T., 12 Maw 2014, Yn: Open Biology. 2014, 2, t. 140008

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  26. Cyhoeddwyd

    When livelihoods take a battering…: mapping the ‘new gold rush’ in the Angwa-Pote basin

    Kamete, A. & Kamete, A. Y., 1 Medi 2007, Yn: Transformation. 65, t. 36-67

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  27. Cyhoeddwyd

    When nature meets the divine: effect of prohibition regimes on the structure and tree-species composition of sacred forests in Northern Greece

    Marini Govigli, V., Healey, J., Wong, J., Stara, K., Tsiakiris, R. & Halley, J., 7 Awst 2020, Yn: Web Ecology. 20, 2, t. 53-86 48 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. Cyhoeddwyd

    When one phenotype is not enough: divergent evolutionary trajectories govern venom variation in a widespread rattlesnake species

    Zancolli, G., Calvete, J. J., Cardwell, M. D., Greene, H. W., Hayes, W. K., Hegarty, M. J., Herrmann, H-W., Holycross, A. T., Lannutti, D. I., Mulley, J. F., Sanz, L., Travis, Z. D., Whorley, J. R., Wuster, C. E. & Wuster, W., 13 Maw 2019, Yn: Proceedings of the Royal Society B: Biological Sciences. 286, 1898, t. 20182735

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  29. Cyhoeddwyd

    When should communities and conservationists monitor exploited resources?

    Hockley, N. J., Jones, J. P. G., Andriahajaina, F. B., Manica, A., Ranambitsoa, E. H. & Randriamboahary, J. A., 1 Hyd 2005, Yn: Biodiversity and Conservation. 14, 11, t. 2795-2806

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  30. Cyhoeddwyd

    When the tiny help the mighty: facilitation between two introduced species, a solitary ascidian and a macroalga in northern Patagonia, Argentina

    Javier Pereyra, P., de la Barra, P., Gastaldi, M., Francisco Saad, J., Nahuel Firstater, F. & Andrea Narvarte, M., Medi 2017, Yn: Marine Biology. 164, 9, 185.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. Cyhoeddwyd

    When time is of the essence: choosing a currency for prey- handling costs

    Rovero, F., Hughes, R. N. & Chelazzi, G., 1 Gorff 2000, Yn: Journal of Animal Ecology. 69, 4, t. 683-689

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Where are the best opportunities for reducing greenhouse gas emissions in the food system (including the food chain)? A comment

    Dorward, L., 2012, Yn: Food Policy. 37, 4, t. 463-466

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Who Harvests and Why? Characteristics of Guatemalan Households Harvesting Xaté (Chamaedorea ernesti-augusti)

    Williams, S., Gibbons, J. M., Clubbe, C., Dibble, A., Marroquin, A. & Jones, J. P. G., 24 Hyd 2012, Yn: Economic Botany. 66, 4, t. 357-369

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  34. Cyhoeddwyd

    Who bears the cost of forest conservation?

    Poudyal, M., Jones, J. P. G., Rakotonarivo, O. S., Hockley, N., Gibbons, J. M., Mandimbiniaina, R., Rasoamanana, A., Andrianantenaina, N. S. & Ramamonjisoa, B. S., 5 Gorff 2018, Yn: PeerJ. 6, e5106.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Whole genome duplication and transposable element proliferation drive genome expansion in Corydoradinae catfishes

    Marburger, S., Alexandrou, M., Taggart, J. B., Creer, S., Carvalho, G., Oliveira, C. & Taylor, M. I., 14 Chwef 2018, Yn: Proceedings of the Royal Society B: Biological Sciences. 285, 1872, 20172732.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. Cyhoeddwyd

    Whole genome resequencing data enables a targeted SNP panel for conservation and aquaculture of Oreochromis cichlid fishes

    Ciezarek, A., Ford, A. G. P., Etherington, G. J., Kasozi, N., Malinsky, M., Mehta, T. K., Penso-Dolfin, L., Ngatunga, B. P., Shechonge, A., Tamatamah, R., Haerty, W., Palma, F. D., Genner, M. J. & Turner, G. F., 15 Chwef 2022, Yn: Aquaculture. 548, Part 2, t. 737637 737637.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  37. Cyhoeddwyd

    Whole genome sequences of Malawi cichlids reveal multiple radiations interconnected by gene flow

    Malinsky, M., Svardal, H., Tyers, A., Miska, E. A., Genner, M. J., Turner, G. & Durbin, R., Rhag 2018, Yn: Nature Ecology and Evolution. 2, t. 1940-1955

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    Whole tree harvesting can reduce second rotation forest productivity

    Walmsley, J. D., Jones, D. L., Reynolds, B., Price, M. H. & Healey, J. R., 10 Chwef 2009, Yn: Forest Ecology and Management. 257, 3, t. 1104-1111

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. Cyhoeddwyd

    Whose backyard? Some precautions in choosing recipient sites for assisted colonisation of Australian plants and animals

    Hayward, M. W., Harris, S., Arnall, S., Byrne, M., Coates, D., Hayward, M., Martin, T., Mitchell, N. & Garnett, S., 24 Mai 2013, Yn: Ecological Management and Restoration. 14, 2, t. 106-111

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Why are some biodiversity policies implemented and others ignored? Lessons from the uptake of the Global Strategy for Plant Conservation by botanic gardens

    Williams, S., Jones, J. P. G., Clubbe, C., Sharrock, S. & Gibbons, J. M., 1 Ion 2012, Yn: Biodiversity and Conservation. 21, 1, t. 175-187

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Why artificial light at night should be a focus for global change research in the 21st century

    Davies, T. W. & Smyth, T., Maw 2018, Yn: Global Change Biology. 24, 3, t. 872-882

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Why do some bird species incorporate more anthropogenic materials into their nests than others?

    Jagiello, Z., Reynolds, S. J., Nagy, J., Mainwaring, M. C. & Ibáñez-Álamo, J. D., 23 Awst 2023, Yn: Philosophical Transactions of The Royal Society B: Biological Sciences. 378, 1884, t. 1-14

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Why is there no market in pesticide hazard?

    Edwards-Jones, G., 1 Meh 2006, Yn: Outlooks on Pest Management. 17, 3, t. 98

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Wide Band Polarization-Free Wavelength Conversion Based on Four-Wave -Mixing in Semiconductor Optical Amplifiers

    Hong, Y., Spencer, P. S. & Shore, K. A., 1 Chwef 2004, Yn: IEEE Journal of Quantum Electronics. 40, 2, t. 152-156

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Wide bandwidth, low loss 1 by 4 wavelength division multiplexer on silicon for optical interconnects

    Tan, D. T. H., Ikeda, K., Zamek, S., Mizrahi, A., Nezhad, M. P., Krishnamoorthy, A. V., Raj, K., Cunningham, J. E., Zheng, X., Shubin, I., Luo, Y. & Fainman, Y., 31 Ion 2011, Yn: Optics Express. 19, 3, t. 2401-2409 9 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  46. Cyhoeddwyd

    Wide-Field and Real-Time Super-Resolution Optical Imaging By Titanium Dioxide Nanoparticle-Assembled Solid Immersion Lens

    Wang, W., Yan, B., Wang, H., Chen, Y., Nie, X., Yi, C., Wang, Z., Xu, Z., Zeng, J. & Fan, W., 7 Meh 2023, Yn: Small. 19, 23, 2207596.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Wideband Chaos With Time-Delay Concealment in Vertical-Cavity Surface-Emitting Lasers With Optical Feedback and Injection

    Hong, Y., Spencer, P. S. & Shore, K. A., 5 Chwef 2014, Yn: IEEE Journal of Quantum Electronics. 50, 4, t. 236-242

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Wideband complex-enhanced chaos generation using a semiconductor laser subject to delay-interfered self-phase-modulated feedback

    Zhao, A., Jiang, N., Xue, C., Tang, J. & Qiu, K., Ebr 2019, Yn: Optics Express. 27, 9, t. 12336-12348

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. Cyhoeddwyd

    Widespread colonisation of Tanzanian catchments by introduced Oreochromis tilapia fishes: the legacy from decades of deliberate introduction

    Shechonge, A., Ngatunga, B. P., Bradbeer, S. J., Day, J. J., Freer, J. J., Ford, A. GP., Kihedu, J., Richmond, T., Mzighani, S., Smith, A. M., Sweke, E. A., Tamatamah, R., Tyers, A. M., Turner, G. F. & Genner, M. J., Ebr 2019, Yn: Hydrobiologia. 832, 1, t. 235-253 19 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  50. Cyhoeddwyd

    Widespread convergence in toxin resistance by predictable molecular evolution

    Wuster, W., Ujvari, B., Casewell, N. R., Sunagar, K., Arbuckle, K., Wüster, W., Lo, N., O'Meally, D., Beckmann, C., King, G. F., Deplazes, E. & Madsen, T., 22 Medi 2015, Yn: Proceedings of the National Academy of Sciences of the USA. 112, 38, t. 11911-11916

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  51. Cyhoeddwyd

    Widespread deoxygenation of temperate lakes

    Jane, S. F., Hansen, G. J. A., Kraemer, B. M., Leavitt, P. R., Mincer, J. L., North, R. L., Pilla, R. M., Stetler, J. T., Williamson, C. E., Woolway, R. I., Arvola, L., Chandra, S., DeGasperi, C. L., Diemer, L., Dunalska, J., Erina, O., Flaim, G., Grossart, H-P., Hambright, K. D., Hein, C., Hejzlar, J., Janus, L. L., Jenny, J-P., Knoll, L. B., Leoni, B., Mackay, E., Matsuzaki, S-I. S., McBride, C., Muller-Navarra, D. C., Paterson, A. M., Pierson, D., Rogora, M., Rusak, J. A., Sadro, S., Saulnier-Talbot, E., Schmid, M., Sommaruga, R., Thiery, W., Verburg, P., Weathers, K. C., Weyhenmeyer, G. A., Yokota, K. & Rose, K. C., 2 Meh 2021, Yn: Nature. 594, 7861, t. 66-70

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid