Search results

Explore your search results using the filter checkboxes, or amend your search or start a new search.

Displaying results 1 - 50 of 80Click/tap on any title to see full details of the record

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)

Downloadable files:

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

Crawford RJM, Sydeman WJ, Tom DB, Thayer JA, Sherley RB, Shannon LJ, Mcinnes AM, Makhado AB, Hagen C, Furness RW, Carpenter-Kling T, Saraux C 2022. Food limitation of seabirds in the Benguela ecosystem and management of their prey base. Namibian Journal of Environment 6 (A) 1-13

Downloadable files:

Attachment	Size
Food limitation of seabirds in the Benguela ecosystem and management of their prey base.pdf	1.31 MB

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

Downloadable files:

Attachment	Size
Seabirds of the Benguela Ecosystem.pdf	990.95 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, 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

Downloadable files:

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

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, Makhado AB, Whittington PA, Randall RM, Oosthuizen WH, Waller LJ 2015. A changing distribution of seabirds in South Africa—the possible impact of climate and its consequences. Frontiers in Ecology and the Environment Review Article

Downloadable files:

Attachment	Size
A changing distribution of seabirds in South Africa_2015.pdf	2.47 MB

Crawford RJM, Altwegg R, Barham BJ, Barham PJ, Durant JM, Altwegg R 2014. Age-specific survival and movement among major African Penguin Spheniscus demersus colonies. IBIS 156 (4) 716-728

Website link:https://onlinelibrary.wiley.com/doi/abs/10.1111/ibi.12189

Sherley RB, Ludynia K, Lamont T, Roux J-P, Crawford RJM, Underhill LG 2013. The initial journey of an Endangered penguin: implications for seabird conservation. Endangered Species Research 21 89-95

Downloadable files:

Attachment	Size
The initial journey of an Endangered penguin_implications for seabird conservation.pdf	144.13 KB

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

Crawford RJM, Shelton PA, Cooper J, Brooke RK 2010. Distribution, population size and conservation of the Cape gannet Morus capensis. South African Journal of Marine Science 1 (1) 153-174

Downloadable files:

Attachment	Size
Distribution_population size and conservation of the Cape gannet Morus capensis_2010.pdf	1.97 MB

Crawford RJM, Whittington PA, Martin AP, Tree AJ, Makhado AB 2009. Population trends of seabirds breeding in South Africa's Eastern Cape and the possible influence of anthropogenic and environmental change. Marine Ornithology 37 159-174

Downloadable files:

Attachment	Size
Population trends of seabirds breeding in South Africas Eastern Cape.pdf	1017.49 KB

Hutchings L, Van der Lingen CD, Shannon LJ, Crawford RJM, Verheye HMS, Bartholomae CH, van der Plas AK, Louw D 2009. The Benguela Current: An ecosystem of four components. Progress in Oceanography 83 15 - 32

Downloadable files:

Attachment	Size
Hutchings et al 2009 The Benguela in four parts.pdf	2.51 MB

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

Downloadable files:

Attachment	Size
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

Downloadable files:

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

Crawford RJM 2007. Food, fishing and seabirds in the Benguela upwelling system. Journal of Ornithology 148 (2) 253-260

Downloadable files:

Attachment	Size
Food_fishing and seabirds in the Benguela upwelling system_2007.pdf	243.22 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 Kirkman SP 325-342

Downloadable files:

Attachment	Size
Conservation status of seabirds and seals breeding in Benguela Ecosystem.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

Downloadable files:

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

Downloadable files:

Attachment	Size
Trends in numbers of Cape Cormorants.pdf	253.71 KB

Crawford RJM 2007. Chapter 20: Trends in numbers of three cormorants Phalacrocorax spp. breeding in South Africa's Western Cape Province. 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 173-178

Downloadable files:

Attachment	Size
Trends in numbers of three cormorants Phalacrocorax spp_2007.pdf	628.31 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

Downloadable files:

Attachment	Size
Crawford_2006_Acta_Zool_Sinica_Molt_Afrcn_Penguin.pdf	619.36 KB

Whittington PA, Randall RM, Randall BM, Wolfaardt AC, Crawford RJM, Klages NTW, Bartlett PA, Chesselet YJ, Jones R 2005. Patterns of movements of the African penguin in South Africa and Namibia. African Journal of Marine Science 27 (1) 215-229

Website link:http://www.tandfonline.com/doi/abs/10.2989/18142320509504080

Whittington PA, Randall RM, Crawford RJM, Wolfaardt AC, Klages NTW, Randall BM, Bartlett PA, Chesselet YJ, Jones R 2005. Patterns of immigration to and emigration from breeding colonies by African penguins. African Journal of Marine Science 27 (1) 205-213

Website link:http://www.ajol.info/index.php/ajms/article/view/33213

Underhill LG, Crawford RJM 2005. Indexing the health of the environment for breeding seabirds in the Benguela ecosystem. ICES Journal of Marine Science 62 360e365

Downloadable files:

Attachment	Size
Indexing the health of the environment for breeding seabirds in the Benguela ecosystem.pdf	104.18 KB

Crawford RJM 2004. Accounting for food requirements of seabirds in fisheries management - the case of the South African purse-seine fishery. African Journal of Marine Science 26 (1) 197-203

Downloadable files:

Attachment	Size
Accounting for food requirements of seabirds in fisheries management the case of the South African purse seine fishery.pdf	268.06 KB

Griffiths CL, van Sittert L, Best PB, Brown AC, Clark BM, Cook PA, Crawford RJM, David JHM, Davies BR, Griffiths MH, Hutchings K, Jerardino A, Kruger N, Lamberth S, Leslie RW, Melville-Smith R, Tarr R, Van der Lingen CD 2004. Impacts of human activities on marine animal life in the Benguela: A historical overview. Oceanography and Marine Biology: An Annual Review 42 303-392

Downloadable files:

Attachment	Size
Impacts of human activities on marine animal life in the Benguela_A historical overview.pdf	1.86 MB

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

Downloadable files:

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

David JHM, Curry P, Crawford RJM, Randall RM, Underhill LG, Meÿer MA 2003. Assessing conservation priorities in the Benguela ecosystem, South Africa: analysing predation by seals on threatened seabirds. Biological Conservation 114 (2) 289-292

Website link:http://www.sciencedirect.com/science/article/pii/S0006320703000181

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

Shannon LJ, Crawford RJM 1999. Management of the African Penguin Spheniscus demersus – insights from modelling. Marine Ornithology 27 119-128

Downloadable files:

Attachment	Size
Shannon_1999_Marine_Ornith_penguins.pdf	455.11 KB

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

Downloadable files:

Attachment	Size
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 1999. Seabird responses to long-term changes of prey resources off southern Africa. Proceedings 22 International Ornithological Congress 688-705

Downloadable files:

Attachment	Size
Seabird responses to long_term changes of prey resources off southern Africa.pdf	358.74 KB

Crawford RJM 1997. Impact of the Apollo Sea oil spill on the colonies of African Penguins Spheniscus demersus at Dassen and Robben Islands, South Africa.

Crawford RJM, Simmons RE 1997. Dama Tern. The Atlas of Southern African Birds 1 480-481

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

Downloadable files:

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

Villacastin-Herrero CA, Underhill LG, Crawford RJM, Shannon LV 1996. Sea-surface temperature of oceans surrounding subequatorial Africa - seasonal patterns, spatial coherence and long-term trends. South Africa Journal of Science 92 189-197

Downloadable files:

Attachment	Size
Sea_surface temperature of oceans surrounding subequatorial Africa.pdf	1.05 MB

Shannon LJ, Nelson G, Crawford RJM, Boyd AJ 1996. Possible impacts of environmental-change on pelagic fish recruitment - modeling anchovy transport by advective processes in the southern Benguela. Global Change Biology 2 407 – 420

Website link:http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2486.1996.tb00091.x/abstract

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

Downloadable files:

Attachment	Size
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

Downloadable files:

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

Crawford RJM, Shannon LJ, Nelson G 1995. Environmental-change, regimes and middle-sized pelagic fish in the South-East Atlantic-Ocean. Scientia Marina 59 417-426

Downloadable files:

Attachment	Size
Environmental change_regimes and middle sized pelagic fish in the South East Atlantic Ocean_1995.pdf	10.34 MB

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

Downloadable files:

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

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

Berruti A, Underhill LG, Shelton PA, Moloney C, Crawford RJM 1993. Seasonal and interannual variation in the diet of 2 colonies of the Cape Gannet (Morus capensis) between 1977-78 and 1989. Colonial Waterbirds 16 1977 – 1978

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

Downloadable files:

Attachment	Size
Top predators in the Benguela ecosystem.pdf	1.29 MB

Crawford RJM, Allwright DM, Heyl CW 1992. High mortality of Cape Cormorants (Phalacrocorax capensis) off Western South Africa in 1991 caused by Pasteurella multocida. Colonial Waterbirds 15 236-238

Website link:http://www.jstor.org/stable/1521458

Shannon LV, Crawford RJM, Pollock DE, Hutchings L, Boyd AJ, Taunton-Clark J, Badenhorst A, Melville-Smith R, Augustyn CJ, Kochrane KL, Hampton I, Nelson G, Japp DW, Tarr RJQ 1992. The 1980s - a decade of change in the Benguela ecosystem. South African Journal of Marine Science 12 271 – 296

Downloadable files:

Attachment	Size
The 1980s_a decade of change in the Benguela ecosystem.pdf	2.79 MB

Rae CMD, Boyd AJ, Crawford RJM 1992. Predation of anchovy by an Agulhas ring - a possible contributory cause of the very poor year-class of 1989. South African Journal of Marine Science 12 167-173

Downloadable files:

Attachment	Size
Predation of anchovy by an Agulhas ring.pdf	739.3 KB

Villacastin-Herrero CA, Crawford RJM, Field JG 1992. Statistical correlations between purse-seine catches of chub mackerel off South Africa and selected environmental parameters. South African Journal of Marine Science 12 (1) 157-165

Downloadable files:

Attachment	Size
Statistical correlations between purse seine catches of chub mackerel off South Africa and selected environmental parameters.pdf	677.24 KB

Not found what you are looking for? Amend your search...