| Plastic pollution in the world's oceans: more than 5 trillion plastic pieces weighing over 250,000 tons afloat at sea M Eriksen, LCM Lebreton, HS Carson, M Thiel, CJ Moore, JC Borerro, ... PloS one 9 (12), e111913, 2014 | 1321 | 2014 |
| Roberts' birds of southern Africa PAR Hockey, WRJ Dean, PG Ryan, S Maree, BM Brickman Trustees of the John Voelcker Bird Book Fund, 2005 | 1148 | 2005 |
| Monitoring the abundance of plastic debris in the marine environment PG Ryan, CJ Moore, JA van Franeker, CL Moloney Philosophical Transactions of the Royal Society B: Biological Sciences 364 …, 2009 | 797 | 2009 |
| Offshore diplomacy, or how seabirds mitigate intra-specific competition: a case study based on GPS tracking of Cape gannets from neighbouring colonies D Grémillet, G Dell¹Omo, PG Ryan, G Peters, Y Ropert-Coudert, ... Marine Ecology Progress Series 268, 265-279, 2004 | 275 | 2004 |
| Plastic ingestion and PCBs in seabirds: is there a relationship? PG Ryan, AD Connell, BD Gardner Marine pollution bulletin 19 (4), 174-176, 1988 | 233 | 1988 |
| Birds of Africa south of the Sahara I Sinclair, P Ryan Princeton univ. press, 2003 | 229 | 2003 |
| Diving birds in cold water: do Archimedes and Boyle determine energetic costs? RP Wilson, K Hustler, PG Ryan, AE Burger, EC Noldeke The American Naturalist 140 (2), 179-200, 1992 | 218 | 1992 |
| A junk-food hypothesis for gannets feeding on fishery waste D Grémillet, L Pichegru, G Kuntz, AG Woakes, S Wilkinson, RJM Crawford, ... Proceedings of the Royal Society B: Biological Sciences 275 (1639), 1149-1156, 2008 | 210 | 2008 |
| Exploitation of mesoscale oceanographic features by grey-headed albatross Thalassarche chrysostoma in the southern Indian Ocean DC Nel, JRE Lutjeharms, EA Pakhomov, IJ Ansorge, PG Ryan, ... Marine Ecology Progress Series 217, 15-26, 2001 | 206 | 2001 |
| The incidence and characteristics of plastic particles ingested by seabirds PG Ryan Marine Environmental Research 23 (3), 175-206, 1987 | 205 | 1987 |
| Can predation by invasive mice drive seabird extinctions? RM Wanless, A Angel, RJ Cuthbert, GM Hilton, PG Ryan Biology letters 3 (3), 241-244, 2007 | 204 | 2007 |
| Spatial match–mismatch in the Benguela upwelling zone: should we expect chlorophyll and sea‐surface temperature to predict marine predator distributions? D Grémillet, S Lewis, L Drapeau, CD van Der Lingen, JA Huggett, ... Journal of Applied Ecology 45 (2), 610-621, 2008 | 201 | 2008 |
| Effects of ingested plastic on seabird feeding: evidence from chickens PG Ryan Marine Pollution Bulletin 19 (3), 125-128, 1988 | 188 | 1988 |
| Pelagic plastics and other seaborne persistent synthetic debris: a review of Southern Hemisphere perspectives MR Gregory, PG Ryan Marine Debris, 49-66, 1997 | 177 | 1997 |
| How much is a clean beach worth? The impact of litter on beach users in the Cape Peninsula, South Africa A Ballance, PG Ryan, JK Turpie South African Journal of Science 96 (5), 210-230, 2000 | 162 | 2000 |
| Global research priorities to mitigate plastic pollution impacts on marine wildlife AC Vegter, M Barletta, C Beck, J Borrero, H Burton, ML Campbell, ... Endangered Species Research 25 (3), 225-247, 2014 | 160 | 2014 |
| GPS tracking a marine predator: the effects of precision, resolution and sampling rate on foraging tracks of African Penguins PG Ryan, SL Petersen, G Peters, D Grémillet Marine biology 145 (2), 215-223, 2004 | 153 | 2004 |
| Interactions between seabirds and deep‐water hake trawl gear: an assessment of impacts in South African waters BP Watkins, SL Petersen, PG Ryan Animal conservation 11 (4), 247-254, 2008 | 151 | 2008 |
| Marine no-take zone rapidly benefits endangered penguin L Pichegru, D Grémillet, RJM Crawford, PG Ryan Biology letters 6 (4), 498-501, 2010 | 146 | 2010 |
| Research priorities for seabirds: improving conservation and management in the 21st century R Lewison, D Oro, BJ Godley, L Underhill, S Bearhop, RP Wilson, ... Endangered Species Research 17 (2), 93-121, 2012 | 137 | 2012 |
