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Sherley RB, Makhado AB, Crawford RJM, Hagen C, Kemper J, Ludynia K, Masotla MJ, McInnes A, Pichegru L, Tom D, Upfold L, Waller LJ 2024. The African Penguin Spheniscus demersus should be considered Critically Endangered. Ostrich 95 (3)

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The African Penguin Spheniscus demersus should be considered Critically Endangered.pdf	670.38 KB

Makhado AB, Braby R, Dyer BM, Kemper J, Mcinnes AM, Tom D, Crawford RJM 2021. Seabirds of the Benguela Ecosystem: Utilisation, long-term changes and challenges. Birds - Challenges and opportunities for business, conservation and research Mikkola H

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Seabirds of the Benguela Ecosystem.pdf	990.95 KB

Sherley RB, Crawford RJM, de Blocq AD, Dyer BM, Geldenhuys D, Hagen C, Kemper J, Makhado AB, Pichegru L, Upfold L, Visagie J, Waller LJ, Winker H 2020. The conservation status and population decline of the African penguin deconstructed in space and time. Ecology and Evolution 10 (15) 8506-8516

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The conservation status and population decline of the African penguin deconstructed in space and time.pdf	965.34 KB

Dyer BM, Cooper J, Crawford RJM, Sherley RB, Somhlaba S, Cockcroft A, Upfold L, Makhado AB 2020. Geographical and temporal variation in the diet of Bank Cormorants Phalacrocorax neglectus in South Africa. Ostrich 90 (4) 373-390

Website link:https://www.ajol.info/index.php/ostrich/article/view/192097

Sherley RB, Crawford RJM, Dyer BM, Kemper J, Makhado AB, Masotla M, Pichegru L, Pistorius PA, Roux J-P, Ryan PG, Tom D, Upfold L, Winker H 2019. The status and conservation of the Cape Gannet Morus capensis. Ostrich 90 (4) 335-346

Website link:https://www.ajol.info/index.php/ostrich/article/view/192070

Crawford RJM, Altwegg R, Barham BJ, Barham PJ, Durant JM, Dyer BM 2011. Collapse of South Africa's penguins in the early 21st century. African Journal of Marine Science 33 (1) 139-156

Website link:https://www.tandfonline.com/doi/abs/10.2989/1814232X.2011.572377

Kemper J, Underhill LG, Crawford RJM, Kirkman SP 2007. Chapter 42: Revision of the conservation status of seabirds and seals breeding in the Benguela Ecosystem. Final report of the BCLME (Benguela Current Large Marine Ecosystem) project on top predators as Biological Indicators of Ecosystem Change in the BCLME Kirkman SP 325-342

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Conservation status of seabirds and seals breeding in Benguela Ecosystem.pdf	616.42 KB

Crawford RJM, Dyer BM, Kemper J, Simmons RE, Upfold L 2007. Trends in numbers of Cape Cormorants (Phalacrocorax capensis) over a 50-year period, 1956-57 to 2006-08. Emu 107 1 - 9

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Trends in numbers of Cape Cormorants.pdf	253.71 KB

Kemper J, Crawford RJM 2007. Chapter 5: Report on the availability and quality of seabird information. Final Report of the BCLME (Benguela Current Large Marine Ecosystem) Project on Top Predators as Biological Indicators of Ecosystem Change in the BCLME. Avian Demography Unit, Cape Town Kirkman SP 31-36

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Report on the availability and quality of seabird information_2007.pdf	35.09 KB

Kemper J, Underhill LG, Crawford RJM, Kirkman SP 2007. Chapter 42: Revision of the conservation status of seabirds and seals breeding in the Benguela Ecosystem. Final Report of the BCLME (Benguela Current Large Marine Ecosystem) Project on Top Predators as Biological Indicators of Ecosystem Change in the BCLME. Avian Demography Unit, Cape Town 325-342

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Revision of the conservation status of seabirds and seals breeding in the Benguela Ecosystem_2007.pdf	616.42 KB

Crawford RJM, Underhill LG, Upfold L, Dyer BM 2007. An altered carrying capacity of the Benguela upwelling ecosystem for African penguins (Spheniscus demersus). ICES Journal of Marine Science 64 570-576

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An altered carrying capacity of the Benguela upwelling ecosystem for African penguins.pdf	229.47 KB

Crawford RJM, Hemming M, Kemper J, Klages NTW, Randall RM, Underhill LG, Venter AD, Ward VL, Wolfaardt AC 2006. S24-2 Molt of the African penguin, Spheniscus demersus, in relation to its breeding season and food availability. Acta Zoologica Sinica 53 (Supplement) 444-447

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Crawford_2006_Acta_Zool_Sinica_Molt_Afrcn_Penguin.pdf	619.36 KB

Oschadleus HD, Dyer BM, Crawford RJM, Upfold L 2003. Sociable Weaver roadside nest densities in southern Namibia. Lanioturdus 36 (3) 12-17

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Sociable Weaver roadside nest densities in southern Namibia.pdf	301.93 KB

Crawford RJM, David JHM, Shannon LJ, Kemper J, Klages NTW, Roux J-P, Underhill LG, Ward VL, Williams AJ, Wolfaardt AC 2001. African penguins as predators and prey - coping (or not) with change. South African Journal of Marine Science 23 (1) 435-447

Website link:http://www.ingentaconnect.com/content/nisc/sajms/2001/00000023/00000001/art00032

Cordes I, Crawford RJM, Williams AJ, Dyer BM 1999. Decrease of African Penguins at the Possession Island group, 1956-1995: contrasting trends for colonial and solitary breeders. Marine Ornithology 27 129-138

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Cordes_1999_Marine_Ornithology_27_129-138.pdf	105.01 KB

Crawford RJM, Dyer BM, Cordes I, Williams AJ 1999. Seasonal pattern of breeding, population trend and conservation status of bank cormorants Phalacrocorax neglectus off south western Africa. Biological Conservation 87 (1) 49-58

Website link:http://www.sciencedirect.com/science/article/pii/S0006320798000421

Crawford RJM, Dyer BM 1996. Age at breeding of crowned cormorants Phalacrocorax coronatus. South African Journal of Marine Science 17 (1) 315-318

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Age at breeding of crowned cormorants Phalacrocorax coronatus_1996.pdf	454.6 KB

Crawford RJM, Williams AJ, Hofmeyr JH, Klages NTW, Randall RM, Cooper J, Dyer BM, Chesselet Y 1995. Trends of African Penguin Spheniscus demersus populations in the 20th-century. South African Journal of Marine Science 16 (1) 101-118

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Trends of African Penguin Spheniscus demersus populations in the 20th_century.pdf	1.28 MB

Crawford RJM, Dyer BM 1995. Responses by four seabird species to a fluctuating availability of Cape Anchovy Engralis capensis off South Africa. Ibis 137 (3) 329-339

Website link:http://onlinelibrary.wiley.com/doi/10.1111/j.1474-919X.1995.tb08029.x/abstract

Crawford RJM, Dyer BM, Brown PC 1995. Absence of breeding by African Penguins at 4 former colonies. South African Journal of Marine Science 15 269-272

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Absence of breeding by African penguins at four former colonies_1995.pdf	481.29 KB

Crawford RJM, Cooper J, Dyer BM 1995. Conservation of an increasing population of Great White Pelicans Pelecanus onocrotalus in South Africa's Western Cape. South African Journal of Marine Science 15 33-42

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Conservation of an increasing population of Great White Pelicans Pelecanus onocrotalus in South Africas Western Cape.pdf	859.32 KB

Crawford RJM, Dyer BM, Brook RK 1994. Breeding nomadism in southern African seabirds: constraints, causes and conservation. Ostrich: Journal of African Ornithology 65 (2) 231-246

Website link:http://www.tandfonline.com/doi/abs/10.1080/00306525.1994.9639687#.VRzupGf9kpE

Crawford RJM, Underhill LG, Raubenheimer CM, Dyer BM, Martin J 1992. Top predators in the Benguela ecosystem - implications of their trophic position. South African Journal of Marine Science 12 (1) 675-687

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Top predators in the Benguela ecosystem.pdf	1.29 MB

Crawford RJM, David JHM, Williams AJ, Dyer BM 1989. Competition for space: recolonizing seals displace endangered endemic seabirds off Namibia. Biological Conservation 48 (1) 59-72

Website link:http://www.sciencedirect.com/science/article/pii/0006320789900591

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