Ysgol Gwyddorau Amgylcheddol a Naturiol

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

    Adoption of Agroforestry in Northwest Viet Nam: What Roles Do Social and Cultural Norms Play?

    Nguyen, M. P., Pagella, T., Catacutan, D. C., Nguyen, T. Q. & Sinclair, F., Ebr 2021, Yn: Forests. 12, 4, 493.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  3. Cyhoeddwyd

    Adoption of rice varieties - I. Age of varieties and patterns of variability

    Witcombe, J. R., Khadka, K., Puri, R. R., Khanal, N. P., Sapkota, A. & Joshi, K. D., 1 Hyd 2017, Yn: Experimental Agriculture. 53, 4, t. 512-527

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  4. Cyhoeddwyd

    Adoption of rice varieties. 2. Accelerating uptake

    Witcombe, J. R., Khadka, K., Puri, R. R., Khanal, N. P., Sapkota, A. & Joshi, K. D., 1 Hyd 2017, Yn: Experimental Agriculture. 53, 4, t. 627-643

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  5. Cyhoeddwyd

    Adrenergic responses of Antarctic fishes to extreme trauma.

    Whiteley, N. M. & Egginton, S., 1 Chwef 2000, Yn: Journal of Physiology. 523, Supplement S, t. 279P-280P

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  6. Cyhoeddwyd

    Adsorption and desorption dynamics of citric acid anions in soil

    Oburger, E., Leitner, D., Jones, D. L., Zygalakis, K. C., Schnepf, A. & Roose, T., 1 Hyd 2011, Yn: European Journal of Soil Science. 62, 5, t. 733-742

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

    Adult worm tegumental damage and egg-granulomas in praziquantel-resistant and -susceptible Schistosoma mansoni treated in vivo.

    Liang, Y. S., Coles, G. C., Dai, J. R., Zhu, Y. C. & Doenhoff, M. J., 1 Rhag 2002, Yn: Journal of Helminthology. 76, 4, t. 327-333

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. Cyhoeddwyd

    Advanced Processing of Food Waste Based Digestate for Mitigating Nitrogen Losses in a Winter Wheat Crop

    Sanchez Rodriguez, A., Carswell, A. M., Shaw, R., Hunt, J., Saunders, K., Cotton, J., Chadwick, D., Jones, D. L. & Misselbrook, T. H., 17 Gorff 2018, Yn: Frontiers in Sustainable Food Systems.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  9. Cyhoeddwyd

    Advances and Challenges in the Synthesis of Poly(p-phenylene vinylene)-Based Polymers

    Blayney, A. J., Perepichka, I. F., Wuld, F. & Perepichka, D. F., 23 Meh 2014, Yn: Israel Journal of Chemistry. 54, 5-6, t. 674-688

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. Cyhoeddwyd

    Advances in knowledge of processes in soil–tree–crop interactions in parkland systems in the West African Sahel: A review

    Bayala, J., Sanou, J., Teklehaimanot, Z., Quedraogo, S. J., Kalinganire, A., Coe, R. & van Noordwijk, M., 11 Maw 2015, Yn: Agriculture, Ecosystems and Environment. 205, t. 25-35

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    Advances in metabarcoding techniques bring us closer to reliable monitoring of the marine benthos

    Steyaert, M., Priestley, V., Osborne, O., Herraiz, A., Arnold, R. & Savolainen, V., 1 Tach 2020, Yn: Journal of Applied Ecology. 57, 11, t. 2234–2245

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    Aerobic and anaerobic oxidation of hydrogen by acidophilic bacteria

    Hedrich, S. & Johnson, D. B., 1 Rhag 2013, Yn: FEMS Microbiology Letters. 349, 1, t. 40-45

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  13. Cyhoeddwyd

    Aerodynamics of tip-reversal upstroke in a revolving pigeon wing

    Crandell, K. E. & Tobalske, B. W., Meh 2011, Yn: Journal of Experimental Biology. 214, 11, t. 1867-1873

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  14. Cyhoeddwyd

    African and Asian leopards are highly differentiated at the genomic level

    Paijmans, J., Barlow, A., Becker, M. S., Cahill, J. A., Fickel, J., Forster, D. W. G., Gries, K., Hartmann, S., Havmoller, R. W., Henneberger, K., Kern, C., Kitchener, A. C., Lorenzen, E. D., Mayer, F., O'Brien, S. J., von Seth, J., Sinding, M.-H. S., Spong, G., Uphyrkina, O., Wachter, B., Westbury, M. V., Dalén, L., Bhak, J., Manica, A. & Hofreiter, M., 10 Mai 2021, Yn: Current Biology.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  15. Cyhoeddwyd

    African cichlid Pseudotropheus spp. males moan to females during foreplay.

    Simões, J. M., Fonseca, P. J., Turner, G. F. & Amorim, M. C., 1 Meh 2008, Yn: Journal of Fish Biology. 72, 10, t. 2689-2694

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. Cyhoeddwyd

    African sandalwood (Osyris lanceolata): resource assessment and quality variation among populations in Tanzania.

    Mwang'ingo, P. L., Teklehaimanot, Z., Hall, J. B. & Lulandala, L. L., 1 Ion 2003, Yn: Southern African Forestry Journal. 199, t. 77-88

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  17. Cyhoeddwyd

    Against a grey tide: red squirrel conservation on Anglesey

    Shuttleworth, C., 2005, Yn: Quarterly Journal of Forestry. 99, t. 213-214

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    Age of cichlids: New dates for ancient lake fish radiations

    Genner, M. J., Seehausen, O., Lunt, D. H., Joyce, D. A., Shaw, P. W., Carvalho, G. R. & Turner, G. F., 1 Mai 2007, Yn: Molecular Biology and Evolution. 24, 5, t. 1269-1282

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Age-Related Variation in Foraging Behaviour in the Wandering Albatross at South Georgia: No Evidence for Senescence

    Froy, H., Lewis, S., Catry, P., Bishop, C. M., Forster, I. P., Fukuda, A., Higuchi, H., Phalan, B., Xavier, J. C., Nussey, D. H. & Phillips, R. A., 9 Ion 2015, Yn: PLoS ONE. 10, 9

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    Age-dependent loss of fertility in water-borne sperm of the bryozoan Celleporella hyalina

    Manriquez, P. H., Hughes, R. N. & Bishop, J. D., 18 Rhag 2001, Yn: Marine Ecology Progress Series. 224, t. 87-92

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Agricultural land use regulates the fate of soil phosphorus fractions following the reclamation of wetlands

    Qin, L., Jiang, M., Freeman, C., Zou, Y., Gao, C., Tian, W. & Wang, G., 10 Maw 2023, Yn: Science of the Total Environment. 863, 160891.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    Agriculture and Eutrophication: Where Do We Go from Here?

    Withers, P. J., Neal, C., Jarvie, H. P. & Doody, D. G., 2 Medi 2014, Yn: Sustainability. 6, 9, t. 5853-5875

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Cyhoeddwyd

    Agro-Biodiversity Management: Using Indigenous Knowledge to Cope with Climate Change in the Middle-Hills of Nepal

    Baul, T. K. & McDonald, M. A., 21 Chwef 2014, Yn: Agricultural Research. 3, 1, t. 41-52

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  24. Cyhoeddwyd

    Agrochemicals interact synergistically to increase bee mortality

    Siviter, H., Bailes, E., Martin, C. D., Oliver, T., Koricheva, J., Leadbetter, E. & Brown, M. J. F., 9 Awst 2021, Yn: Nature.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  25. Cyhoeddwyd

    Agroecosystem resilience in response to extreme winter flooding

    Harvey, R. J., Chadwick, D. R., Sánchez-Rodríguez, A. R. & Jones, D. L., 1 Gorff 2019, Yn: Agriculture, Ecosystems and Environment. 279, t. 1-13

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  26. Cyhoeddwyd

    Agronomic amendments drive a diversity of real and apparent priming responses within a grassland soil

    Brown, R., Reed, E., Chadwick, D., Hill, P. & Jones, D. L., 1 Chwef 2024, Yn: Soil Biology and Biochemistry. 189, 109265.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  27. Cyhoeddwyd

    Agronomic diversity of naked barley (Hordeum vulgare L.): a potential resource for breeding new food barley for Europe

    Dickin, E., Steele, K., Edwards-Jones, G. & Wright, D., 1 Maw 2012, Yn: Euphytica. 184, 1, t. 85-99

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. Cyhoeddwyd

    Agronomic evaluation and performance of flax varieties for industrial fibre production.

    Dimmock, J. P., Bennett, S. J., Wright, D., Edwards-Jones, G. & Harris, I. M., 1 Awst 2005, Yn: Journal of Agricultural Science. 143, 4, t. 299-309

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  29. Cyhoeddwyd

    Airborne DNA reveals predictable spatial and seasonal dynamics of fungi

    Abrego, N., Furneaux, B., Hardwick, B., Somervuo, P., Palorinne, I., Aguilar-Trigueros, C. A., Andrew, N. R., Babiy, U. V., Bao, T., Bazzano, G., Bondarchuk, S. N., Bonebrake, T. C., Brennan, G. L., Bret-Harte, S., Bässler, C., Cagnolo, L., Cameron, E. K., Chapurlat, E., Creer, S., D'Acqui, L. P., de Vere, N., Desprez-Loustau, M.-L., Dongmo, M. A. K., Jacobsen, I. B. D., Fisher, B. L., Flores de Jesus, M., Gilbert, G. S., Griffith, G. W., Gritsuk, A. A., Gross, A., Grudd, H., Halme, P., Hanna, R., Hansen, J., Hansen, L. H., Hegbe, A. D. M. T., Hill, S., Hogg, I. D., Hultman, J., Hyde, K. D., Hynson, N. A., Ivanova, N., Karisto, P., Kerdraon, D., Knorre, A., Krisai-Greilhuber, I., Kurhinen, J., Kuzmina, M., Lecomte, N., Lecomte, E., Loaiza, V., Lundin, E., Meire, A., Mešić, A., Miettinen, O., Monkhouse, N., Mortimer, P., Müller, J., Nilsson, R. H., Nonti, P. Y. C., Nordén, J., Nordén, B., Norros, V., Paz, C., Pellikka, P., Pereira, D., Petch, G., Pitkänen, J.-M., Popa, F., Potter, C., Purhonen, J., Pätsi, S., Rafiq, A., Raharinjanahary, D., Rakos, N., Rathnayaka, A. R., Raundrup, K., Rebriev, Y. A., Rikkinen, J., Rogers, H. M. K., Rogovsky, A., Rozhkov, Y., Runnel, K., Saarto, A., Savchenko, A., Schlegel, M., Schmidt, N. M., Seibold, S., Skjøth, C., Stengel, E., Sutyrina, S. V., Syvänperä, I., Tedersoo, L., Timm, J., Tipton, L., Toju, H., Uscka-Perzanowska, M., van der Bank, M., van der Bank, F. H., Vandenbrink, B., Ventura, S., Vignisson, S. R., Wang, X., Weisser, W. W., Wijesinghe, S. N., Wright, S. J., Yang, C., Yorou, N. S., Young, A., Yu, D. W., Zakharov, E. V., Hebert, P. D. N., Roslin, T. & Ovaskainen, O., 25 Gorff 2024, Yn: Nature. 631, 8022, t. 835-842 8 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  30. Cyhoeddwyd

    Alarm call modification by prairie dogs in the presence of juveniles

    Wilson-Henjum, G., Job, J., McKenna, M. F., Shannon, G. & Wittemyer, G., Mai 2019, Yn: Ethology. 37, 2, t. 167-174 8 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. Cyhoeddwyd

    Albizia zygia, a shade tree for cocoa: the effects of duration of acid scarification and substrate acidity on the germination of seed.

    Anim-Kwapong, G. & Teklehaimanot, Z., 1 Ion 2001, Yn: Forests, Trees and Livelihoods. 11, t. 47-55

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Alcalilimnicola halodurans gen. nov., sp nov., an alkaliphilic, moderately halophilic and extremely halotolerant bacterium, isolated from sediments of soda-depositing Lake Natron, East Africa Rift Valley.

    Yakimov, M. M., Giuliano, L., Chernikova, T. N., Gentile, G., Abraham, W. R., Lunsdorf, H., Timmis, K. N. & Golyshin, P. N., 1 Tach 2001, Yn: International Journal of Systematic and Evolutionary Microbiology. 51, 6, t. 2133-2143

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Alcanivorax borkumensis gen. nov., sp. nov., a new, hydrocarbon-degrading and surfactant-producing marine bacterium

    Yakimov, M. M., Golyshin, P. N., Lang, S., Moore, E. R., Abraham, W. R., Lünsdorf, H. & Timmis, K. N., Ebr 1998, Yn: International journal of systematic bacteriology. 48 Pt 2, t. 339-48 10 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  34. Cyhoeddwyd

    Alcanivorax borkumensis produces an extracellular siderophore in iron-limitation condition maintaining the hydrocarbon-degradation efficiency

    Denaro, R., Crisafi, F., Russo, D., Genovese, M., Messina, E., Genovese, L., Carbone, M., Ciavatta, M. L., Ferrer, M., Golyshin, P. & Yakimov, M. M., 1 Hyd 2014, Yn: Marine Genomics. 17, October, t. 43-52

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Alien invasions and livelihoods: Economic benefits of invasive Australian Red Claw crayfish in Jamaica

    Pienkowski, T., Williams, S., McLaren, K., Wilson, B. & Hockley, N., 21 Chwef 2015, Yn: Ecological Economics. 112, t. 68-77

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. Cyhoeddwyd

    Aligning efficiency benchmarking with sustainable outcomes in the United Kingdom water sector

    Walker, N. L., Styles, D., Gallagher, J. & Williams, A. P., 1 Meh 2021, Yn: Journal of Environmental Management. 287, 112317.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  37. Cyhoeddwyd

    Alignment of chevron-shaped molecules for photonic and electronic applications

    Ashwell, G. J. & Amiri, M. A., 1 Awst 2002, Yn: Journal of Materials Chemistry. 12, 8, t. 2181-2183

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    All that glitters is not gold: The effect of top-down participation on conservation knowledge, attitudes and institutional trust in a Central Indian tiger reserve

    Macura, B., Secco, L., Pisani, E., Pullin, A. & Reyes-García, V., 1 Awst 2016, Yn: Regional Environmental Change. 16, August, t. 125-140

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. Cyhoeddwyd

    Alleviation of both water and nutrient limitations is necessary to accelerate ecological restoration of waste rock tips.

    Williamson, J. C., Rowe, E. C., Hill, P. W., Nason, M. A., Jones, D. L. & Healey, J. R., Maw 2011, Yn: Restoration Ecology. 19, 2, t. 194-204

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Allometry and Ecology of the Bilaterian Gut Microbiome

    Sherrill-Mix, S., McCormick, K., Lauder, A., Bailey, A., Zimmerman, L., Li, Y., Django, J.-B. N., Bertolani, P., Colin, C., Hart, J. A., Hart, T. B., Georgiev, A. V., Sanz, C. M., Morgan, D. B., Atencia, R., Cox, D., Muller, M. N., Sommer, V., Piel, A. K., Stewart, F. A., Speede, S., Roman, J., Wu, G., Taylor, J., Bohm, R., Rose, H. M., Carlson, J., Mjungu, D., Schmidt, P., Gaughan, C., Bushman, J. I., Schmidt, E., Bittinger, K., Collman, R. G., Hahn, B. H. & Bushman, F. D., 27 Maw 2018, Yn: mBio. 9, 2, e00319-18.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Allylsilanes in organic synthesis; stereoselective preparation and reactions of functionalised β,γ-epoxysilanes

    Murphy, P. J., Russell, A. T. & Procter, G., 1990, Yn: Tetrahedron Letters. 31, 7, t. 1055-1058 4 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Alpha male status and availability of conceptive females are associated with high glucocorticoid concentrations in high-ranking male rhesus macaques (Macaca mulatta) during the mating season

    Milich, K. M., Georgiev, A. V., Petersen, R. M., Thompson, M. E. & Maestripieri, D., Ion 2018, Yn: Hormones and Behavior. 97, t. 5-13

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Alterations in the cytoskeleton accompany aluminum-induced growth inhibition and morphological changes in primary roots of maize

    Gilroy, S., Blancaflor, E. & Jones, D. L., 1 Medi 1998, Yn: Plant Physiology. 118, 1, t. 159-172

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Altered chemokine expression in the spinal cord and brain contributes to differential interleukin-1 beta-induced neutrophil recruitment.

    Campbell, S. J., Wilcockson, D. C., Butchart, A. G., Perry, V. H. & * Anthony, D. C., 1 Hyd 2002, Yn: Journal of Neurochemistry. 83, 2, t. 432-441

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Alternative pathways to a sustainable future lead to contrasting biodiversity responses

    Martins, I. S., Navarro, L. M., Pereira, H. M. & Rosa, I., Meh 2020, Yn: Global Ecology and Conservation. 22, e01028.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  46. Cyhoeddwyd

    Aluminium complexation suppresses citrate uptake by acid forest soil microorganisms.

    Fransson, A. M., Vinogradoff, S., Godbold, D. L., Van Hees, P. A. & Jones, D. L., 1 Chwef 2004, Yn: Soil Biology and Biochemistry. 36, 2, t. 353-357

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Aluminium effects on organic acid mineralization in a Norway spruce forest soil.

    Jones, D. L., Eldhuset, T., De Wit, H. A. & Swensen, B., 1 Gorff 2001, Yn: Soil Biology and Biochemistry. 33, 9, t. 1259-1267

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Aluminium-induced alteration of ion homeostasis in root tip vacuoles of two maize varieties differing in Al tolerance.

    Garzon, T., Gunse, B., Moreno, A. R., Tomos, A. D., Barcelo, J. & Poschenrieder, C., 1 Mai 2011, Yn: Plant Science. 180, 5, t. 709-715

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. Cyhoeddwyd

    Aluminium-organic acid interactions in acid soils: I. Effect of root-derived organic acids on the kinetics of Al dissolution

    Jones, D. L. & Kochian, L. V., Mai 1996, Yn: Plant and Soil. 182, 2, t. 221-228

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  50. Cyhoeddwyd

    Aluminium-organic acid interactions in acid soils: II. Influence of solid phase sorption on organic acid-Al complexation and Al rhizotoxicity

    Jones, D. L., Prabowo, A. M. & Kochian, L. V., Mai 1996, Yn: Plant and Soil. 182, 2, t. 229-237

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  51. Cyhoeddwyd

    Aluminum Inhibition of the Inositol 1,4,5-Trisphosphate Signal Transduction Pathway in Wheat Roots: A Role in Aluminum Toxicity?

    Jones, D. L. & Kochian, L. V., Tach 1995, Yn: Plant Cell. 7, 11, t. 1913-1922

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

Blaenorol 1...3 4 5 6 7 8 9 10 ...115 Nesaf