Ysgol Gwyddorau Amgylcheddol a Naturiol

  1. Cyhoeddwyd

    Influence of Natural Thermal Gradients on Whole Animal Rates of Protein Synthesis in Marine Gammarid Amphipods

    Rastrick, S. P. & Whiteley, N. M., 27 Maw 2013, Yn: PLoS ONE. 8, 3, t. e60050

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  2. Cyhoeddwyd

    Minimal latitudinal variations in the metabolic rates of temperate but not polar gammarid amphipods.

    Rastrick, S. P. & Whiteley, N. M., 1 Ion 2008, 2008 gol. Unknown.

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  3. Cyhoeddwyd

    Feeding plasticity more than metabolic rate drives the productivity of economically important filter feeders in response to elevated CO2 and reduced salinity

    Rastrick, S., Graham, H., Strohmeier, T., Whiteley, N. & Strand, Ø., 1 Rhag 2018, Yn: ICES Journal of Marine Science. 75, 6, t. 2117-2128

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  4. Cyhoeddwyd

    Protect Madagascar’s national parks from pillage

    Ratsimbazafy, J., Jones, J. P. G. & Mittermeier, R., 30 Ion 2019, Yn: Nature. 565, 7741, t. 567

    Allbwn ymchwil: Cyfraniad at gyfnodolynLlythyradolygiad gan gymheiriaid

  5. Cyhoeddwyd

    Biomining

    Rawlings, D. E. (gol.) & Johnson, D. B. (gol.), 1 Ion 2006, 2006 gol. Springer Verlag.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  6. Cyhoeddwyd

    Ecology and biodiversity of extremely acidophilic microorganisms.

    Rawlings, D. E. & Johnson, D. B., 1 Ion 2002

    Allbwn ymchwil: Ffurf annhestunolSafe Gwe / Cyhoeddiad Gwe

  7. Cyhoeddwyd

    The microbiology of biomining: development and optimization of mineral-oxidizing microbial consortia.

    Rawlings, D. E. & Johnson, D. B., 1 Chwef 2007, Yn: Microbiology - SGM. 153, 2, t. 315-324

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. Cyhoeddwyd

    Estimating the population density of the Asian Tapir Tapirus indicus from a selectively logged forest in Peninsular Malaysia

    Rayan, D. M., Mohamad, S. W., Dorward, L., S.A., A., Clements, R. B., Wong, C., Traeholt, C. & Magintan, D., Rhag 2012, Yn: Integrative Zoology. 7, 4, t. 373-380

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  9. Cyhoeddwyd

    A simple parameterisation of windbreak effects on wind speed reduction and thermal benefits of sheep

    Rayment, M., He, Y. & Jones, P. J., 28 Mai 2017, Yn: Agricultural and Forest Meteorology. 239, t. 96-107

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. Cyhoeddwyd

    Novel approach for quantifying illegal bushmeat consumption reveals high consumption of protected species in Madagascar

    Razafimanahaka, J. H., Jenkins, R., Andriafidison, D., Randrianandrianina, F., Rakotomboavonjy, V., Keane, A. & Jones, J. P. G., 1 Hyd 2012, Yn: Oryx. 46, 4, t. 584-592

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    Detection of new genetic variants of Betacoronaviruses in Endemic Frugivorous Bats of Madagascar

    Razanajatovo, N. H., Nomenjanahary, L. A., Wilkinson, D. A., Razafimanahaka, J. H., Goodman, S. M., Jenkins, R. K., Jones, J. P. G. & Heraud, J., 12 Maw 2015, Yn: Virology Journal. 12, 42

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    Colour forms of Amazonian cichlid fish represent reproductively isolated species.

    Ready, J. S., Sampaio, I., Schneider, H., Vinson, C., Dos Santos, T. & Turner, G. F., 1 Gorff 2006, Yn: Journal of Evolutionary Biology. 19, 4, t. 1139-1148

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  13. Cyhoeddwyd

    LDPE and biodegradable PLA-PBAT plastics differentially affect plant-soil nitrogen partitioning and dynamics in a Hordeum vulgare mesocosm

    Reay, M. K., Greenfield, L. M., Graf, M., Lloyd, C. E. M., Evershed, R. P., Chadwick, D. R. & Jones, D. L., 5 Ebr 2023, Yn: Journal of Hazardous Materials. 447, 130825.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  14. Cyhoeddwyd

    The soil microbial community and plant biomass differentially contribute to the retention and recycling of urinary-N in grasslands

    Reay, M. K., Marsden, K., Powell, S., Rivera, L. M., Chadwick, D., Jones, D. L. & Evershed, R. P., 1 Mai 2023, Yn: Soil Biology and Biochemistry. 180, 109011.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  15. Cyhoeddwyd

    High resolution HPLC-MS confirms overestimation of urea in soil by the diacetyl monoxime (DAM) colorimetric method

    Reay, M. K., Yates, C. A., Johnes, P. J., Arthur, C. J., Jones, D. L. & Evershed, R. P., Awst 2019, Yn: Soil Biology and Biochemistry. 135, t. 127-133

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. Cyhoeddwyd

    Development of Alditol Acetate Derivatives for the Determination of 15N-Enriched Amino Sugars by Gas Chromatography-Combustion-Isotope Ratio Mass Spectrometry

    Reay, M. K., Knowles, T. D. J., Jones, D. L. & Evershed, R. P., 5 Maw 2019, Yn: Analytical Chemistry. 91, 5, t. 3397-3404 8 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  17. Cyhoeddwyd

    Combining field and laboratory approaches to quantify N assimilation in a soil microbe-plant-animal grazing land system

    Reay, M. K., Marsden, K., Powell, S., Chadwick, D., Jones, D. L. & Evershed, R. P., 15 Ebr 2023, Yn: Agriculture, Ecosystems and Environment. 346, 108338.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    N-15-amino sugar stable isotope probing (N-15-SIP) to trace the assimilation of fertiliser-N by soil bacterial and fungal communities

    Reay, M. K., Charteris, A. F., Jones, D. L. & Evershed, R. P., Tach 2019, Yn: Soil Biology and Biochemistry. 138, 107599.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Synthesis and characterization of struvite derived from poultry manure as a mineral fertilizer

    Rech, I., Kamogawa, M. Y., Jones, D. L. & Pavinato, P. S., 15 Hyd 2020, Yn: Journal of Environmental Management. 272, 111072.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    Solubility, Diffusion and Crop Uptake of Phosphorus in Three Different Struvites

    Rech, I., Withers, P. J. A., Jones, D. L. & Pavinato, P. S., Ion 2019, Yn: Sustainability. 11, 1, 134.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Submicrometer fiber-optic Fabry-Perot interferometer formed by use of the Langmuir-Blodgett technique

    Rees, N. D., James, S. W., Staines, S. E., Tatam, R. P. & Ashwell, G. J., 1 Rhag 2001, Yn: Optics Letters. 26, 23, t. 1840-1842

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    Optical fiber long-period gratings with Langmuir-Blodgett thin-film overlays.

    Rees, N. D., James, S. W., Tatam, R. P. & Ashwell, G. J., 1 Mai 2002, Yn: Optics Letters. 27, 9, t. 686-688

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Cyhoeddwyd

    Applied winter biology: threats, conservation and management of biological resources during winter in cold climate regions

    Reeve, C., Robichaud, J. A., Fernandes, T., Bates, A. E., Bramburger, A. J., Brownscombe, J. W., Davy, C. M., Henry, H. A. L., McMeans, B., Moise, E., Sharma, S., Smith, P. A., Studd, E. K., O'Sullivan, A. M., Sutton, A., Templer, P. H. & Cooke, S. J., 2023, Yn: Conservation physiology. 11, 1, t. coad027 coad027.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  24. Cyhoeddwyd

    Molecular genetic analysis of Daphnia in the English Lake District: species identity, hybridisation and resting egg banks.

    Reid, V. A., Carvalho, G. R. & George, D. G., 1 Meh 2000, Yn: Freshwater Biology. 44, 2, t. 247-253

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  25. Cyhoeddwyd

    A technique for the molecular genetic analysis of Daphnia resting eggs from sub-recent lake sediments.

    Reid, V. A., Carvalho, G. R., George, D. G. & Griffiths, H. I., 1 Mai 2002, Yn: Journal of Paleolimnology. 27, 4, t. 481-486

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  26. Cyhoeddwyd

    Shrubland primary production and soil respiration diverge along European climate gradient

    Reinsch, S., Koller, E., Sowerby, A., de Dato, G., Estiarte, M., Guidolotti, G., Kovács-Láng, E., Kröel-Dulay, G., Lellei-Kovács, E., Larsen, K. S., Liberati, D., Peñuelas, J., Ransijn, J., Robinson, D., Schmidt, I. K., Smith, A., Tietema, A., Dukes, J. S., Beier, C. & Emmett, B., Maw 2017, Yn: Scientific Reports. 7, 43952.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  27. E-gyhoeddi cyn argraffu

    Quantifying natural and anthropogenic impacts on streamflow and sediment load reduction in the upper to middle Yellow River Basin

    Ren, D., Liu, S., Wu, Y., Xiao, F., Patil, S., Dallison, R., Feng, S., Zhao, F., Qiu, L., Wang, S., Zhang, S. & Li, L., 1 Meh 2024, Yn: Journal of Hydrology: Regional Studies. 53, 101788.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. Cyhoeddwyd

    Potential sources and occurrence of macro-plastics and microplastics pollution in farmland soils: A typical case of China

    Ren, S., Wang, K., Zhang, J., Li, J., Zhang, H., Qi, R., Xu, W., Yan, C., Liu, X., Zhang, F., Jones, D. L. & Chadwick, D. R., 2 Ebr 2024, Yn: Critical Reviews in Environmental Science and Technology. 54, 7, t. 533-556 33 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygl adolyguadolygiad gan gymheiriaid

  29. Cyhoeddwyd

    Criterios e Indicadores Para Proyectos REDD, Proyecto ‘Fortalecimiento de Capacidadades para Pagos por Servicios Ambientales (Carbon y Biodiversidad) en la Amazonia Peruana

    Rendón Thompson, O. R., Baker, T. R., Healey, J., Del Castillo, D., Jones, J. P. G. & Román Cuesta, R. M., 2008, University of Leeds. 40 t.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  30. Cyhoeddwyd

    Different cultures, different values: The role of cultural variation in public’s WTP for marine species conservation

    Ressurreição, A., Gibbons, J. M., Kaiser, M. J., Dentinho, T. P., Zarzycki, T., Bentley, C., Austen, M., Burdon, D., Atkins, J., Santos, R. S. & Edwards-Jones, G., 1 Ion 2012, Yn: Biological Conservation. 145, 1, t. 1487-159

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. Cyhoeddwyd

    Comparison of Statistical Modelling Approaches for Estimating Tropical Forest Aboveground Biomass Stock and Reporting Their Changes in Low-Intensity Logging Areas Using Multi-Temporal LiDAR Data

    Rex, F. E., Silva, C. A., Dalla Corte, A. P., Klauberg, C., Mohan, M., Cardil, A., Silva, V. S. D., Almeida, D. R. A. D., Garcia, M., Broadbent, E. N., Valbuena, R., Stoddart, J., Merrick, T. & Hudak, A. T., 8 Mai 2020, Yn: Remote Sensing. 12, 9, 1498.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Conversion of a carboxylesterase into a triacylglycerol lipase by a random mutation.

    Reyes-Duarte, D., Polaina, J., Lopez-Cortes, N., Alcalde, M., Plou, F. J., Elborough, K., Ballesteros, A., Timmis, K. N., Golyshin, P. N. & Ferrer, M., 1 Tach 2005, Yn: Angewandte Chemie - International Edition. 44, 46, t. 7553-7557

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Towards complete and error-free genome assemblies of all vertebrate species

    Rhie, A., McCarthy, S. A., Fedrigo, O., Damas, J., Formenti, G., Koren, S., Uliano-Silva, M., Chow, W., Fungtammasan, A., Kim, J., Lee, C., Ko, B. J., Chaisson, M., Gedman, G. L., Cantin, L. J., Thibaud-Nissen, F., Haggerty, L., Bista, I., Smith, M., Haase, B., Mountcastle, J., Winkler, S., Paez, S., Howard, J., Vernes, S. C., Lama, T. M., Grutzner, F., Warren, W. C., Balakrishnan, C. N., Burt, D., George, J. M., Biegler, M. T., Iorns, D., Digby, A., Eason, D., Robertson, B., Edwards, T., Wilkinson, M., Turner, G., Meyer, A., Kautt, A. F., Franchini, P., Detrich, H. W., Svardal, H., Wagner, M., Naylor, G. J. P., Pippel, M., Malinsky, M., Mooney, M., Simbirsky, M., Hannigan, B. T., Pesout, T., Houck, M., Misuraca, A., Kingan, S. B., Hall, R., Kronenberg, Z., Sović, I., Dunn, C., Ning, Z., Hastie, A., Lee, J., Selvaraj, S., Green, R. E., Putnam, N. H., Gut, I., Ghurye, J., Garrison, E., Sims, Y., Collins, J., Pelan, S., Torrance, J., Tracey, A., Wood, J., Dagnew, R. E., Guan, D., London, S. E., Clayton, D. F., Mello, C. V., Friedrich, S. R., Lovell, P. V., Osipova, E., Al-Ajli, F. O., Secomandi, S., Kim, H., Theofanopoulou, C., Hiller, M., Zhou, Y., Harris, R. S., Makova, K. D., Medvedev, P., Hoffman, J., Masterson, P., Clark, K., Martin, F., Howe, K., Flicek, P., Walenz, B. P., Kwak, W., Clawson, H., Diekhans, M., Nassar, L., Paten, B., Kraus, R. H. S., Crawford, A. J., Gilbert, M. T. P., Zhang, G., Venkatesh, B., Murphy, R. W., Koepfli, K-P., Shapiro, B., Johnson, W. E., Di Palma, F., Marques-Bonet, T., Teeling, E. C., Warnow, T., Graves, J. M., Ryder, O. A., Haussler, D., O’Brien, S. J., Korlach, J., Lewin, H. A., Howe, K., Myers, E. W., Durbin, R., Phillippy, A. M. & Jarvis, E. D., 28 Ebr 2021, Yn: Nature. 592, 7856, t. 737-746 10 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  34. Cyhoeddwyd

    Using chemical, microbial and fluorescence techniques to understand contaminant sources and pathways to wetlands in a conservation site

    Rhymes, J. M., Rhymes, J., Jones, L., Lapworth, D. J., White, D., Fenner, N., McDonald, J. E. & Perkins, T. L., 20 Ion 2015, Yn: Science of the Total Environment. 511, t. 703-710

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Evidence for sensitivity of dune wetlands to groundwater nutrients

    Rhymes, J. M., Rhymes, J., Wallace, H., Fenner, N. & Jones, L., 21 Mai 2014, Yn: Science of the Total Environment. 490, t. 103-113

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. Cyhoeddwyd

    Evaluating the accuracy and usefulness of commercially-available proximal soil mapping services for grassland nutrient management planning and soil health monitoring

    Rhymes, J., Chadwick, D. R., Williams, A. P., Harris, I. M., Lark, R. M. & Jones, D. L., Meh 2023, Yn: Precision Agriculture. 24, 3, t. 898-920 23 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  37. Cyhoeddwyd

    Identifying barriers to routine soil testing within beef and sheep farming systems

    Rhymes, J., Wynne-Jones, S., Williams, P., Harris, I., Rose, D., Chadwick, D. & Jones, D. L., 15 Rhag 2021, Yn: Geoderma. 404, 115298.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    Small changes in water levels and groundwater nutrients alter nitrogen and carbon processing in dune slack soils

    Rhymes, J., Jones, L., Wallace, H., Jones, T. G., Dunn, C. & Fenner, N., Awst 2016, Yn: Soil Biology and Biochemistry. 99, t. 28-35

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. Cyhoeddwyd

    Assessing the effectiveness, practicality and cost effectiveness of mitigation measures to reduce greenhouse gas emissions from intensively cultivated peatlands

    Rhymes, J. M., Arnott, D., Chadwick, D. R., Evans, C. D. & Jones, D. L., 1 Tach 2023, Yn: Land Use Policy. 134, 106886.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Анализ криптической плазмиды pN30 из нефтеразрушающего штамма Rhodococcus erythropolis 30

    Riabchenko, L. E., Novikov, A. D., Golyshin, P. N. & Ianenko, A. S., Rhag 2005, Yn: Genetika. 41, 12, t. 1725-7 3 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Community Responses to Eastern Hemlock Loss Across a Latitudinal Gradient

    Ribbons, R. R., 1 Gorff 2014, Yn: Southeastern Naturalist. 13, sp6, t. 88-103

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Disturbance and climatic effects on red spruce community dynamics at its southern continuous range margin

    Ribbons, R. R., 6 Maw 2014, Yn: PeerJ. 2, t. e293

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Linking microbial communities, functional genes and nitrogen-cycling processes in forest floors under four tree species

    Ribbons, R., Levy-Booth, D. J., Masse, J., Grayston, S. J., McDonald, M., Vesterdal, L. & Prescott, C. E., 1 Rhag 2016, Yn: Soil Biology and Biochemistry. 103, December, t. 181-191

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Context-dependent tree species effects on soil nitrogen transformations and related microbial functional genes

    Ribbons, R., McDonald, M., Vesterdal, L. & Prescott, C. E., 28 Awst 2018, Yn: Biogeochemistry. 140, 2, t. 145-160 15 t., 140.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Roots and rhizospheric soil microbial community responses to tree species mixtures.

    Ribbons, R., Del Toro, I., Smith, A., Healey, J., Vesterdal, L. & McDonald, M., Awst 2022, Yn: Applied Soil Ecology. 176, 104509.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  46. Cyhoeddwyd

    Can microsatellites be used to infer phylogenies? Evidence from population affinities of the Western Canary Island lizard (Gallotia galloti)

    Richard, M. & Thorpe, R. S., 1 Medi 2001, Yn: Molecular Phylogenetics and Evolution. 20, 3, t. 351-360

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Venom lethality and diet: Differential responses of natural prey and model organisms to the venom of the saw-scaled vipers (Echis)

    Richards, D. P., Barlow, A. & Wüster, W., 1 Ion 2012, Yn: Toxicon. 59, t. 110-116 7 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Assessing the scope of the tandem Michael/intramolecular aldol reaction mediated by secondary amines, thiols and phosphines

    Richards, E. L., Murphy, P. J., Dinon, F., Fratucello, S., Brown, P. M., Gelbrich, T. & Hursthouse, M. B., 3 Medi 2001, Yn: Tetrahedron. 57, 36, t. 7771-7784

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. Cyhoeddwyd

    The contribution of household chemicals to environmental discharges via effluents: Combining chemical and behavioural data

    Richards, S., Paterson, E., Withers, P. J. & Stutter, M., 2 Ion 2015, Yn: Journal of Environmental Management. 150, 1, t. 427-434

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  50. Cyhoeddwyd

    Variation in fishers' attitudes within an inshore fishery: implications for management.

    Richardson, E. A., Kaiser, M. J. & Edwards-Jones, G., 1 Medi 2005, Yn: Environmental Conservation. 32, 3, t. 213-225

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid