The DOI matches its Crossref record; 77 of the 78 references it cites were found in a registry or an index.
Collapse of South Africa's penguins in the early 21st century
Abstract
The number of African penguins Spheniscus demersus breeding in South Africa collapsed from about 56 000 pairs in 2001 to some 21 000 pairs in 2009, a loss of 35 000 pairs (>60%) in eight years. This reduced the global population to 26 000 pairs, when including Namibian breeders, and led to classification of the species as Endangered. In South Africa, penguins breed in two regions, the Western Cape and Algoa Bay (Eastern Cape), their breeding localities in these regions being separated by c. 600 km. Their main food is anchovy Engraulis encrasicolus and sardine Sardinops sagax, which are also the target of purse-seine fisheries. In Algoa Bay, numbers of African penguins halved from 21 000 pairs in 2001 to 10 000 pairs in 2003. In the Western Cape, numbers decreased from a mean of 35 000 pairs in 2001–2005 to 11 000 pairs in 2009. At Dassen Island, the annual survival rate of adult penguins decreased from 0.70 in 2002/2003 to 0.46 in 2006/2007; at Robben Island it decreased from 0.77 to 0.55 in the same period. In both the Western and Eastern Cape provinces, long-term trends in numbers of penguins breeding were significantly related to the combined biomass of anchovy and sardine off South Africa. However, recent decreases in the Western Cape were greater than expected given a continuing high abundance of anchovy. In this province, there was a south-east displacement of prey around 2000, which led to a mismatch in the distributions of prey and the western breeding localities of p…
Overview
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“The African penguin Spheniscus demersus is ‘Endangered’ following a decrease in the global population of >70% between 2001 and 2013 [3], [4].”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [3]
In the citing paper
“However, if the poor prey availability persists, their subsequent survival and reproductive success would be compromised relative to birds at colonies where conditions are more favourable [3], [6], [8].”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [3]
In the citing paper
“This was despite evidence that juvenile African penguins may emigrate to non-natal colonies if the food environment is heterogeneous [3], [5]”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [3]
In the citing paper
“and was towards the upper end of estimates for both juvenile (0.06–0.52) and adult (0.46–0.77) survival at these colonies during our study period [3], [6].”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [3]
In the citing paper
“As the situation for African penguin has continued to deteriorate on the West Coast [3], [6]”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [3]
In the citing paper
“Prey availability in the Western Cape was relatively poor in both 2006 and 2007 [3]”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [3]
In the citing paper
“Bird Island (33°50′S, 26°17′E) and St. Croix Island (33°48′S, 25°46′E) in Algoa Bay, South Africa, host half of the world's population of African Penguins (Crawford et al. 2011).”
From Colour Abberations in African Penguins Spheniscus Demersus (2018) · cites this paper as Crawford et al. 2011
Citations
Cites
Model selection and multimodel inference: a practical information-theoretic approach.
Guthery, F. S., Burnham, K. P., & Anderson, D. R. (2003) · The Journal of Wildlife Management · doi:10.2307/3802723 · Cited by 41,495
Program MARK: survival estimation from populations of marked animals
White, G. C., & Burnham, K. P. (1999) · Bird Study · doi:10.1080/00063659909477239 · Cited by 7,500
Lebreton, J., Burnham, K. P., Clobert, J., & Anderson, D. R. (1992) · Ecological Monographs · doi:10.2307/2937171 · Cited by 4,459
(2022) · Journal of Field Ornithology · doi:10.1111/(issn)1557-9263 · Cited by 2,305
Cury, P. M. (2000) · ICES Journal of Marine Science · doi:10.1006/jmsc.2000.0712 · Cited by 1,163
Robertsʾ birds of southern Africa
Roberts, A., Maclean, G. L., Newman, K. B., & Lockwood, G. (1985) · Medical Entomology and Zoology · Cited by 1,100
Oceanography and marine biology: an annual review
Naylor, E. (1986) · Marine Pollution Bulletin · doi:10.1016/0025-326x(86)90254-7 · Cited by 993
A junk-food hypothesis for gannets feeding on fishery waste
Grémillet, D., Pichegru, L., Kuntz, G., Woakes, A. G., Wilkinson, S., Crawford, R. J. M., & Ryan, P. G. (2008) · Proceedings of the Royal Society B Biological Sciences · doi:10.1098/rspb.2007.1763 · Cited by 237
Self-citationThe penguins : ecology and management
Dann, P., Norman, I., & Reilly, P. N. (1995) · Medical Entomology and Zoology · Cited by 211
Marine no-take zone rapidly benefits endangered penguin
Pichegru, L., Grémillet, D., Crawford, R. J. M., & Ryan, P. G. (2010) · Biology Letters · doi:10.1098/rsbl.2009.0913 · Cited by 180
Self-citationHas the fishery contributed to a major shift in the distribution of South African sardine?
Coetzee, J., van der Lingen, C. D., Hutchings, L., & Fairweather, T. P. (2008) · ICES Journal of Marine Science · doi:10.1093/icesjms/fsn184 · Cited by 170
Roy, C., van der Lingen, C. D., Coetzee, J., & Lutjeharms, J. R. E. (2007) · African Journal of Marine Science · doi:10.2989/ajms.2007.29.3.1.331 · Cited by 162
Crawford, R. J. M., & Dyer, B. M. (1995) · Ibis · doi:10.1111/j.1474-919x.1995.tb08029.x · Cited by 141
Self-citationBanks, S. C., Piggott, M. P., Stow, A., & Taylor, A. C. (2007) · Canadian Journal of Zoology · doi:10.1139/z07-094 · Cited by 136
The Jackass Penguin (Spheniscus demersus) as a pelagic predator
Wilson, R. (1985) · Marine Ecology Progress Series · doi:10.3354/meps025219 · Cited by 125
Barangé, M., Hampton, I., & Roel, B. A. (1999) · South African Journal of Marine Science · doi:10.2989/025776199784126088 · Cited by 124
Following the fish: penguins and productivity in the South Atlantic
Boersma, P. D., Rebstock, G. A., Frere, E., & Moore, S. E. (2009) · Ecological Monographs · doi:10.1890/06-0419.1 · Cited by 112
Pichegru, L., Ryan, P. G., van der Lingen, C. D., Coetzee, J., Ropert‐Coudert, Y., & Grémillet, D. (2007) · Marine Ecology Progress Series · doi:10.3354/meps07128 · Cited by 99
Self-citationFairweather, T. P., van der Lingen, C., Booth, A. J., Drapeau, L., & van der Westhuizen, J. (2006) · African Journal of Marine Science · doi:10.2989/18142320609504215 · Cited by 97
Distribution, population size and conservation of the jackass penguin Spheniscus demersus
Shelton, P. A., Crawford, R. J. M., Cooper, J., & Brooke, R. K. (1984) · South African Journal of Marine Science · doi:10.2989/02577618409504370 · Cited by 84
Self-citationPooled Population Parameter Estimates from Mark-Recapture Data
Hargrove, J. W., & Borland, C. H. (1994) · Biometrics · doi:10.2307/2533449 · Cited by 81
Food, fishing and seabirds in the Benguela upwelling system
Crawford, R. J. M. (2007) · Journal für Ornithologie · doi:10.1007/s10336-007-0228-z · Cited by 80
Self-citationPetersen, S. L., Ryan, P. G., & Grémillet, D. (2006) · Ibis · doi:10.1111/j.1474-919x.2006.00459.x · Cited by 79
Self-citationResponses of seabirds to depletion of food fish stocks
Furness, R. W. (2007) · Journal für Ornithologie · doi:10.1007/s10336-007-0152-2 · Cited by 79
Implications for seabirds off South Africa of a long-term change in the distribution of sardine
Crawford, R., Sabarros, P. S., Fairweather, T. P., Underhill, L. G., & Wolfaardt, A. (2008) · African Journal of Marine Science · doi:10.2989/ajms.2008.30.1.18.468 · Cited by 76
Self-citationInitial impact of the Treasure oil spill on seabirds off western South Africa
Crawford, R. J. M., Davis, S. A., Harding, R. T., Jackson, L. F., Leshoro, T. M., Meÿer, M. A., Randall, R. M., Underhill, L. G., Upfold, L., van Dalsen, A. P., et al. (2000) · South African Journal of Marine Science · doi:10.2989/025776100784125645 · Cited by 75
Self-citationResponses of african penguins to regime changes of sardine and anchovy in the Benguela system
Crawford, R. J. M. (1998) · South African Journal of Marine Science · doi:10.2989/025776198784127015 · Cited by 71
Self-citationAfrican penguins as predators and prey – coping (or not) with change
Crawford, R. J. M., David, J. H. M., Shannon, L. J., Kemper, J., Klages, N. T. W., Roux, J.-P., Underhill, L. G., Ward, V. L., Williams, A. J., & Wolfaardt, A. C. (2001) · South African Journal of Marine Science · doi:10.2989/025776101784528836 · Cited by 71
Self-citationDavid, J. H. M. (1987) · South African Journal of Marine Science · doi:10.2989/025776187784522568 · Cited by 71
Comparison of trends in abundance of guano-producing seabirds in Peru and southern Africa
Crawford, R. J. M., & Jahncke, J. (1999) · South African Journal of Marine Science · doi:10.2989/025776199784126006 · Cited by 68
Self-citationCrawford, R. J. M., Underhill, L. G., Upfold, L., & Dyer, B. M. (2007) · ICES Journal of Marine Science · doi:10.1093/icesjms/fsm009 · Cited by 67
Self-citationTrends of African penguin Spheniscus demersus populations in the 20th century
Crawford, R. J. M., Williams, A. J., Hofmeyr, J. H., Klages, N. T. W., Randall, R. M., Cooper, J., Dyer, B. M., & Chesselet, Y. (1995) · South African Journal of Marine Science · doi:10.2989/025776195784156403 · Cited by 63
Self-citationBerruti, A., Underhill, L. G., Shelton, P. A., Moloney, C. L., & Crawford, R. J. M. (1993) · Colonial Waterbirds · doi:10.2307/1521434 · Cited by 63
Self-citationSeabird consumption and production in the Benguela and Western Agulhas ecosystems
Crawford, R. J. M., Ryan, P. G., & Williams, A. J. (1991) · South African Journal of Marine Science · doi:10.2989/025776191784287709 · Cited by 60
Self-citationPopulation Dynamics of the African Penguin Spheniscus Demersus at Robben Island, South Africa
Crawford, R. J. M., Shannon, L. J., & Whittington, P. A. (1999) · Marine ornithology · doi:10.5038/2074-1235.27.1.434 · Cited by 59
Self-citationLudynia, K., Roux, J.-P., Jones, R., Kemper, J., & Underhill, L. G. (2010) · African Journal of Marine Science · doi:10.2989/1814232x.2010.538151 · Cited by 58
Self-citationCrawford, R. J. M., Cruickshank, R. A., Shelton, P. A., & Kruger, I. (1985) · South African Journal of Marine Science · doi:10.2989/025776185784461252 · Cited by 58
Self-citationUnderhill, L. G., Crawford, R., Wolfaardt, A., Whittington, P., Dyer, B., Leshoro, T. M., Ruthenberg, M., Upfold, L., & Visagie, J. (2006) · African Journal of Marine Science · doi:10.2989/18142320609504218 · Cited by 54
Self-citationHeath, R. G., & Randall, R. M. (1989) · Journal of Zoology · doi:10.1111/j.1469-7998.1989.tb02496.x · Cited by 51
Crawford, R., Underhill, L., Coetzee, J., Fairweather, T., Shannon, L., & Wolfaardt, A. (2008) · African Journal of Marine Science · doi:10.2989/ajms.2008.30.1.17.467 · Cited by 51
Self-citationBREEDING NOMADISM IN SOUTHERN AFRICAN SEABIRDS-CONSTRAINTS, CAUSES AND CONSERVATION
Crawford, R. J. M., Dyer, B. M., & Brooke, R. K. (1994) · Ostrich · doi:10.1080/00306525.1994.9639687 · Cited by 50
Self-citationRecent distributional changes of seabirds in South Africa: is climate having an impact?
Crawford, R., Tree, A., Whittington, P., Visagie, J., Upfold, L., Roxburg, K., Martin, A., & Dyer, B. (2008) · African Journal of Marine Science · doi:10.2989/ajms.2008.30.1.20.470 · Cited by 49
Self-citationNel, D., Taylor, F. E., Ryan, P. G., & Cooper, J. (2003) · African Journal of Marine Science · doi:10.2989/18142320309504039 · Cited by 46
Self-citationMakhado, A., Crawford, R., & Underhill, L. G. (2006) · African Journal of Marine Science · doi:10.2989/18142320609504216 · Cited by 45
Self-citationManagement of the African Penguin Spheniscus Demersus: Insights from Modelling
Shannon, L. J., & Crawford, R. (1999) · Marine ornithology · doi:10.5038/2074-1235.27.1.432 · Cited by 42
Self-citationMarks, M. A., Brooke, R. K., & GILDENHUYS, A. (1997) · Marine ornithology · doi:10.5038/2074-1235.25.1.375 · Cited by 39
Moor, C. L. D., Butterworth, D. S., & Coetzee, J. (2008) · African Journal of Marine Science · doi:10.2989/ajms.2008.30.2.2.552 · Cited by 38
Planning Capture–Recapture Studies: Straightforward Precision, Bias, and Power Calculations
Devineau, O., Choquet, R., & Lebreton, J. (2006) · Wildlife Society Bulletin · doi:10.2193/0091-7648(2006)34[1028:pcsspb]2.0.co;2 · Cited by 38
Recent population trends of jackass penguins Spheniscus demersus off Southern Africa
Crawford, R. J. M., Williams, A. J., Randall, R. M., Randall, B. M., Berruti, A., & Ross, G. J. B. (1990) · Biological Conservation · doi:10.1016/0006-3207(90)90128-c · Cited by 37
Self-citationBarham, P., Crawford, R. J. M., Underhill, L. G., Wolfaardt, A. C., Barham, B. J., Dyer, B. M., Leshoro, T. M., Meÿer, M. A., Navarro, R. A., Oschadleus, D., et al. (2006) · Ostrich · doi:10.2989/00306520609485534 · Cited by 36
Self-citationAltwegg, R., Crawford, R. J. M., Underhill, L. G., & Williams, A. (. J. (2008) · Biological Conservation · doi:10.1016/j.biocon.2008.04.030 · Cited by 35
Self-citationCrawford, R. J. M., Whittington, P. A., Martin, P., Tree, A., & Makhado, A. B. (2009) · Marine ornithology · doi:10.5038/2074-1235.37.2.831 · Cited by 35
Self-citationMass on arrival of rockhopper penguins at Marion Island correlated with breeding success
Crawford, R., Makhado, A. B., Upfold, L., & Dyer, B. M. (2008) · African Journal of Marine Science · doi:10.2989/ajms.2008.30.1.19.469 · Cited by 34
Self-citationManagement of avian choleraPasteurella multocidaoutbreaks on Dyer Island, South Africa, 2002–2005
Waller, L., & Underhill, L. G. (2007) · African Journal of Marine Science · doi:10.2989/ajms.2007.29.1.9.74 · Cited by 33
Self-citationBarham, P. J., Underhill, L. G., Crawford, R. J. M., Altwegg, R., Mario Leshoro, T., Bolton, D. A., Dyer, B. M., & Upfold, L. (2008) · Bird Conservation International · doi:10.1017/s0959270908000142 · Cited by 32
Self-citationDavies, D. (1956) · Division of Sea Fisheries, Department of Commerce & Industries, Union of South Africa eBooks · Cited by 32
Whittington, P. A., Hofmeyr, J. H., & Cooper, J. (1996) · Ostrich · doi:10.1080/00306525.1996.9639700 · Cited by 31
Self-citationRandall, R. M., & Randall, B. M. (1986) · Biological Conservation · doi:10.1016/0006-3207(86)90087-x · Cited by 30
Seasonal patterns in South Africa's Western Cape purseseine fishery
Crawford, R. J. M. (1980) · Journal of Fish Biology · doi:10.1111/j.1095-8649.1980.tb03744.x · Cited by 30
Self-citationCrawford, R. J. M. (2009) · Progress In Oceanography · doi:10.1016/j.pocean.2009.07.021 · Cited by 26
Self-citationPatterns of immigration to and emigration from breeding colonies by African penguins
Whittington, P., Randall, R., Crawford, R., Wolfaardt, A., Klages, N., Randall, B., Bartlett, P., Chesselet, Y., & Jones, R. (2005) · African Journal of Marine Science · doi:10.2989/18142320509504079 · Cited by 25
Self-citationFactors influencing growth of the African penguin colony at Boulders, South Africa, 1985–1999
Crawford, R. J. M., Shannon, L. J., Whittington, P., & MURISON, G. (2000) · South African Journal of Marine Science · doi:10.2989/025776100784125780 · Cited by 23
Self-citationSeason of moult of African penguins at Robben Island, South Africa, and its variation, 1988–1998
Underhill, L. G., & Crawford, R. J. M. (1999) · South African Journal of Marine Science · doi:10.2989/025776199784126015 · Cited by 23
Self-citation(1986) · Deep Sea Research Part B Oceanographic Literature Review · doi:10.1016/0198-0254(86)90051-8 · Cited by 20
Crawford, R. J. M., & Boonstra, H. G. (1994) · Marine ornithology · doi:10.5038/2074-1235.22.2.307 · Cited by 20
Self-citationEvaluating seal–seabird interactions in southern Africa: a critical review
Kirkman, S. P. (2009) · African Journal of Marine Science · doi:10.2989/ajms.2009.31.1.1.772 · Cited by 19
Crawford, R. J. M., Hemming, M., Kemper, J., & Bay, R. (2006) · Cited by 18
Self-citationPatterns of movements of the African penguin in South Africa and Namibia
Whittington, P., Randall, R., Randall, B., Wolfaardt, A., Crawford, R., Klages, N. T. W., Bartlett, P., Chesselet, Y., & Jones, R. (2005) · African Journal of Marine Science · doi:10.2989/18142320509504080 · Cited by 17
Self-citationA New Census Method For Penguins Tested On Jackass Penguins Sphenzscus Demersus
Randall, R. M., Randall, B. M., Cooper, J., & Frost, P. G. H. (1986) · Ostrich · doi:10.1080/00306525.1986.9633658 · Cited by 17
Harris, M. P., Wanless, S., & Elston, D. A. (1998) · Ibis · doi:10.1111/j.1474-919x.1998.tb04394.x · Cited by 17
Breeding and moult phenology of African penguins Spheniscus demersus at Dassen Island
Wolfaardt, A. C., Underhill, L. G., & Visagie, J. (2009) · African Journal of Marine Science · doi:10.2989/ajms.2009.31.2.1.873 · Cited by 16
Self-citationCordes, I. G., Crawford, R., Williams, A., & Dyer, B. M. (1999) · Marine ornithology · doi:10.5038/2074-1235.27.1.433 · Cited by 16
Self-citationPenguins and purse-seiners : competition or co-existence?
Duffy, D. C., Wilson, R. P., Broni, S. C., & Veldhuis, H. A. (1985) · Cited by 16
The efficacy of culling seals seen preying on seabirds as a means of reducing seabird mortality
Makhado, A. B., Meÿer, M., Crawford, R. J. M., Underhill, L. G., & Wilke, C. G. (2009) · African Journal of Ecology · doi:10.1111/j.1365-2028.2008.00966.x · Cited by 14
Self-citationComposition of colonies on the Cape Islands
Rand, R. W. (1963) · Cited by 12
Comparison of moult phenology of African penguins Spheniscus demersus at Robben and Dassen islands
Wolfaardt, A., Underhill, L., & Crawford, R. (2009) · African Journal of Marine Science · doi:10.2989/ajms.2009.31.1.2.773 · Cited by 11
Self-citationComposition of colonies on the South West African islands
Rand, R. W. (1963) · Cited by 6
Research works printed but not linked: 29
- 2010, Island Closure Task Team report. Unpublished report, No. MCM/2010/SWG-PEL/51. Cape Town: Branch Fisheries, Department of Agriculture, Forestry and Fisheries
- Cooper J., 1984, Proceedings 5th Pan-African Ornithological Congress. Southern African Ornithological Society, 217
- Cordes I, 1999, Marine Ornithology, 27, 129
- Crawford RJM., 1998, Benguela dynamics: impacts of variability on shelf-sea environments and their living resources. South African Journal of Marine Science, 19, 355
- Crawford R JM, 1994, Marine Ornithology, 22, 213
- Crawford R JM, 2006, Acta Zoologica Sinica, 52, 444
- Crawford R JM, 1999, Marine Ornithology, 27, 139
- 10.1093/icesjms/fsm009 · DOI
- Crawford R JM, 2009, Marine Ornithology, 37, 159
- Cury P, 2000, ICES Journal of Marine Science, 57, 603
- Davies DH., 1955, Investigational Report of the Sea Fisheries Research Institute, South Africa, 18, 1
- Davies DH., 1956, Investigational Report of the Sea Fisheries Research Institute, South Africa, 23, 1
- Duffy D C, 1987, National Geographic Research, 3, 480
- Grémillet D, 2008, Proceedings of the Royal Society, London Biological Series, 18, 1
- Kemper J, 2007, Final report of the BCLME (Benguela Current Large Marine Ecosystem) project on top predators as biological indicators of ecosystem change in the BCLME, 697
- Klages N TW, 2005, Port of Ngqura marine biomonitor-ing programme. Winter 2005. IECM Report No. C128. Port Elizabeth: Institute for Environmental and Coastal Management, Nelson Mandela Metropolitan University
- Marks M A, 1997, Marine Ornithology, 25, 9
- Matthews JP., 1961, Investigational Report South West African Marine Research Laboratory, 3, 1
- Merkle D, 2010, Acoustic biomass time series data for island closure task team. Island Closure Task Team Report. Unpublished report, No. MCM/2010/SWG-PEL/16. Cape Town: Branch Fisheries, Department of Agriculture, Forestry and Fisheries
- Merkle D, 2009, Hydro-acoustic monitoring of the biomass of pelagic fish available to penguins in a 20 km radius around Robben Island. Unpublished report, No. MCM/2009/ SWG-PEL/36. Cape Town: Branch Marine and Coastal Management, Department of Environmental Affairs and Tourism
- Moseley C, 2011, Hypotheses for relating anchovy and sardine abundance with African Penguin population processes. Unpublished report, No. 2011/SWG-PEL/03. Cape Town: Branch Fisheries, Department of Agriculture, Forestry and Fisheries
- Pradel R, 1996, Capture-recapture survival models taking into account of transients
- Rand RW., 1960, Investigational Report of the Sea Fisheries Research Institute, South Africa, 41, 1
- Rand RW., 1963, Investigational Report of the Sea Fisheries Research Institute, South Africa, 43, 1
- Rand RW., 1963, Investigational Report of the Sea Fisheries Research Institute, South Africa, 46, 1
- Randall R M, 1981, South African Journal of Wildlife Research, 11, 121
- Shannon L J, 1999, Marine Ornithology, 27, 119
- Underhill L G, 2000, Vogelwarte, 40, 315
- Wilson RP., 1984, Journal of Field Ornithology, 55, 9
Cited by
Sorted by citations
Global Seabird Response to Forage Fish Depletion—One-Third for the Birds
Cury, P. M., Boyd, I. L., Bonhommeau, S., Anker‐Nilssen, T., Crawford, R. J. M., Furness, R. W., Mills, J. A., Murphy, E. J., Österblom, H., Paleczny, M., et al. (2011) · Science · doi:10.1126/science.1212928 · Cited by 694
Self-citationPollution, habitat loss, fishing, and climate change as critical threats to penguins
Trathan, P. N., Borboroglu, P. G., Boersma, P. D., Bost, C., Crawford, R. J. M., Crossin, G. T., Cuthbert, R., Dann, P., Davis, L. S., de la Puente, S., et al. (2014) · Conservation Biology · doi:10.1111/cobi.12349 · Cited by 252
Self-citationRoux, J.-P., van der Lingen, C. D., Gibbons, M. J., MOROFF, N. E., Shannon, L. J., Smith, A. D. M., & Cury, P. M. (2013) · Bulletin of Marine Science · doi:10.5343/bms.2011.1145 · Cited by 164
Ropert‐Coudert, Y., Chiaradia, A., Ainley, D. G., Barbosa, A., Boersma, P. D., Brasso, R. L., Dewar, M., Ellenberg, U., Borboroglu, P. G., Emmerson, L., et al. (2019) · Frontiers in Marine Science · doi:10.3389/fmars.2019.00248 · Cited by 153
Self-citationEcosystem change in the southern Benguela and the underlying processes
Blamey, L. K., Shannon, L. J., Bolton, J. J., Crawford, R. J. M., Dufois, F., Evers-King, H., Griffiths, C. L., Hutchings, L., Jarre, A., Rouault, M. P., et al. (2014) · Journal of Marine Systems · doi:10.1016/j.jmarsys.2014.11.006 · Cited by 147
Self-citation
Metadata
- Authors
- Crawford, R., Altwegg, R., Barham, B., Barham, P., Durant, J., Dyer, B., Geldenhuys, D., Makhado, A., Pichegru, L., Ryan, P., Underhill, L., Upfold, L., Visagie, J., Waller, L., & Whittington, P.
- Affiliations
- University of Cape Town (ZA)
- Government of South Africa (ZA)
- CapeNature (ZA)
- Nelson Mandela University (ZA)
- Venue
- African Journal of Marine Science
- Published
- 2011-04
- Volume
- 33
- Issue
- 1
- Pages
- 139-156
- ISSN
- 1814-232X (ISSN-L)
- 1814-2338
- OpenAlex
- W2151041209
- Cited by
- 165
- References
- 78
- Citations by year
- 2026: 6 · 2025: 5 · 2024: 6 · 2023: 9 · 2022: 11 · 2021: 5 · 2020: 11 · 2019: 17 · 2018: 13 · 2017: 11 · 2016: 14 · 2015: 14 · 2014: 18 · 2013: 10 · 2012: 12
- FWCI
- 12.12
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- African Journal of Marine Science (publishedVersion)
- Nelson Mandela University Research Repository (submittedVersion)
- Explore Bristol Research (submittedVersion)
- Bristol Research (University of Bristol) (submittedVersion)
- Funders
- Earthwatch Institute
- South African National Parks
- Topics
- Physical Sciences › Environmental Science › Ecology › Avian ecology and behavior
- Physical Sciences › Environmental Science › Ecology › Marine animal studies overview
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Marine and fisheries research
- Keywords
- African penguin, Spheniscus demersus, population decline (ecology), breeding population, threatened species, anchovy, sardine, adult survival, purse seine fishing, Western Cape, Algoa Bay, Dassen Island, Robben Island, bycatch
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
