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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Sullivan, W.M. | 1991 | The distribution of otters Lutra lutra within a major Irish river system, the Munster Blackwater catchment, 1988-90 | Journal | Ir. Nat. J. | Details... |
| O'Sullivan, W.M. | 1994 | Summer diet of otters on part of the river Blackwater catchment | Journal | Ir. Nat. J. | Details... |
| Odhner, N.H. | 1921 | On some species of Pisidium in the Swedish State Museum | Journal | J. Conch. (Lond.) | Details... |
| Ogilby, J.D. | 1885 | Notes on some Irish fishes | Journal | Sci. Proc. R. D. S. | Details... |
| Oliver, G.A. & Healy, B. | 1998 | Records of aquatic fauna from coastal lagoons in Ireland | Journal | Bull. Ir. biogeog. Soc. | Details... |
| Orr, H.L. | 1900 | The food of trout | Journal | Ir. Nat. | Details... |
| Osborne, B.A. & Doyle, G.J. | 1992 | Occurrence and habitat of the spring quillwort Isoetes setacea Lam. in Lough Goller, Co. Clare (H9) | Journal | Ir. Nat. J. | Details... |
| Pack-Beresford, D.R. | 1923 | Algal discolouration of Lough Neagh and the River Bann | Journal | Ir. Nat. | Details... |
| Pack-Beresford, D.R. | 1937 | Algal discolouration of Lough Neagh and the River Bann | Journal | Ir. Nat. J. | Details... |
| Pack-Beresford, D.R. | 1938 | Algal discolouration of Lough Neagh and the River Bann | Journal | Ir. Nat. J. | Details... |
| Parker, J.G. | 1985 | Review: 'Environmental effects of cadmium in freshwater. A bibliography' by J. Wallen, A.S. Wightman & W. Penning | Journal | Ir. Nat. J. | Details... |
| Parnell, C. | 1903 | Additional notes on the land and freshwater Mollusca of Surrey | Journal | J. Conch. (Lond.) | Details... |
| Patterson, R. | 1907 | Review: 'The aquatic birds of Great Britain & Ireland' by C.J. Patten | Journal | Ir. Nat. | Details... |
| Pearce, E.J. | 1937 | Notes on, and additional records for, some Irish Haliplidae (aquatic Coleoptera), with special reference to Lough Derg | Journal | Ir. Nat. J. | Details... |
| Pearsall, W.H. | 1920 | The aquatic vegetation of the English Lakes | Journal | J. Ecol. | Details... |
| Pearsall, W.H. & Hanby, A.M. | 1925 | The variation in leaf form of Potamogeton perfoliatus | Journal | New Phytol. | Details... |
| Pentland, G.H. | 1912 | Notes on the increase and decrease of some mammals, birds and insects in the county of Louth during the last fifty years | Journal | Ir. Nat. | Details... |
| Percy, A.A. | 1965 | Narrow water-plantain (Alisma lanceolatum) in Lanarkshire | Journal | Glasgow Nat. | Details... |
| Pettersson, M. | 1956 | From milk bottles to Daphne | Journal | Ir. Nat. J. | Details... |
| Philbrick, C.T. & Anderson, G.J. | 1987 | Implications of pollen/ovule ratios and pollen size for the reproductive biology of Potamogeton and autogamy in aquatic angiosperms | Journal | Syst. Bot. | Details... |
956 references found.