Patterns of immigration to and emigration from breeding colonies by African penguins
Abstract
Of over 20 000 African penguins Spheniscus demersus that had been flipper-banded as chicks between 1978 and 1999, 2% of those re-sighted after fledging settled to breed at non-natal colonies. This represented 14% of the banded birds that were subsequently recorded breeding. Only one of these immigrants had previously been recorded breeding at its natal colony, the rest presumably being first-time breeders. The largest proportions of banded chicks that emigrated came from Dyer Island on the south coast of South Africa, all of which settled at colonies to the west or north. Penguins emigrating from Namibian breeding colonies either relocated to the Western Cape of South Africa or settled at colonies farther to the north in Namibia. Emigration and immigration of African penguins are thought to be driven by changes in the distribution and availability of their prey. Eight penguins that were banded in adult plumage were found to have attempted breeding at more than one locality. All were survivors of the Apollo Sea oil spill of 1994 and had been cleaned and released by the Southern African Foundation for the Conservation of Coastal Birds. This is thought to be the first documented evidence of attempted breeding by African penguins at more than one locality.
Integrity signals
Registry
Cites
Statistics
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?
Movement of juvenile African penguins is extensive and breeding at non-natal colonies occurs.
“Movement of juvenile penguins is extensive [30] and breeding at non-natal colonies occurs [6], [26].”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [26]
African penguins exhibit some natal philopatry.
“African penguins exhibit some natal philopatry [26]”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [26]
Cites
World-wide fluctuations of sardine and anchovy stocks: the regime problem
Lluch‐Belda, D., Crawford, R. J. M., Kawasaki, T., MacCall, A. D., Parrish, R. H., Schwartzlose, R. A., & Smith, P. (1989) · South African Journal of Marine Science · doi:10.2989/02577618909504561 · Cited by 414 · see citing works
Self-citationLluch‐Belda, D., Schwartzlose, R. A., Serra, R., PARRISH, R., Kawasaki, T., Hedgecock, D., & Crawford, R. J. M. (1992) · Fisheries Oceanography · doi:10.1111/j.1365-2419.1992.tb00006.x · Cited by 199 · see citing works
Self-citationBoyer, D. C., Boyer, H., Fossen, I., & Kreiner, A. (2001) · South African Journal of Marine Science · doi:10.2989/025776101784528854 · Cited by 101 · see citing works
Initial 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 · see citing works
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 · see citing works
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 · see citing works
Self-citationUNDERHILL, L. G., BARTLETT, P. A., BAUMANN, L., CRAWFORD, R. J. M., DYER, B. M., GILDENHUYS, A., NEL, D. C., OATLEY, T. B., THORNTON, M., UPFOLD, L., et al. (1999) · Ibis · doi:10.1111/j.1474-919x.1999.tb04260.x · Cited by 69 · see citing works
Self-citationTrends of African penguin<i>Spheniscus demersus</i>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 · see citing works
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 · see citing works
Self-citationCock, G. D. L., Duffy, D. C., & Cooper, J. (1987) · Biological Conservation · doi:10.1016/0006-3207(87)90062-0 · Cited by 28 · see citing works
Cordes, I. G., Crawford, R., Williams, A., & Dyer, B. M. (1999) · Marine ornithology · doi:10.5038/2074-1235.27.1.433 · Cited by 16 · see citing works
Self-citationComposition of colonies on the Cape Islands
Rand, R. W. (1963) · Cited by 12 · see citing works
Flagged first, then by citations
1 of the 13 references couldn’t be matched to a known paper.
Cited by
Sorted by citations
Collapse of South Africa's penguins in the early 21st century
Crawford, R., Altwegg, R., Barham, B., Barham, P., Durant, J., Dyer, B., Geldenhuys, D., Makhado, A., Pichegru, L., Ryan, P., et al. (2011) · African Journal of Marine Science · doi:10.2989/1814232x.2011.572377 · Cited by 165 · see citing works
Self-citationRobinson, W. M., Butterworth, D. S., & Plagányi, É. E. (2015) · ICES Journal of Marine Science · doi:10.1093/icesjms/fsv035 · Cited by 68 · see citing works
Crawford, 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 · see citing works
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 · see citing works
Self-citationAge‐specific survival and movement among major African Penguin<i>Spheniscus demersus</i>colonies
Sherley, R. B., Abadi, F., Ludynia, K., Barham, B. J., Clark, A. E., & Altwegg, R. (2014) · Ibis · doi:10.1111/ibi.12189 · Cited by 52 · see citing works
Sherley, R. B., Barham, B. J., Barham, P. J., Leshoro, T. M., & Underhill, L. G. (2012) · Emu - Austral Ornithology · doi:10.1071/mu11055 · Cited by 48 · see citing works
Weller, F. G., Cecchini, L.-A., Shannon, L. J., Sherley, R. B., Crawford, R. J. M., Altwegg, R., Scott, L., Stewart, T. J., & Jarre, A. (2014) · Ecological Modelling · doi:10.1016/j.ecolmodel.2014.01.013 · Cited by 46 · see citing works
Self-citationCrawford, 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 · see citing works
Self-citationSherley, R. B., Waller, L. J., Strauss, V., Geldenhuys, D., Underhill, L. G., & Parsons, N. J. (2014) · PLoS ONE · doi:10.1371/journal.pone.0110794 · Cited by 34 · see citing works
Barham, 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 · see citing works
Self-citationWolfaardt, A., Underhill, L. G., Altwegg, R., Visagie, J., & Williams, A. (2008) · African Journal of Marine Science · doi:10.2989/ajms.2008.30.2.13.563 · Cited by 29 · see citing works
Self-citationRestoration of oiled African penguinsSpheniscus demersusa decade after theApollo Seaspill
Wolfaardt, A., Underhill, L. G., Altwegg, R., & Visagie, J. (2008) · African Journal of Marine Science · doi:10.2989/ajms.2008.30.2.14.564 · Cited by 29 · see citing works
Self-citationLudynia, K., Waller, L., Sherley, R., Abadi, F., Galada, Y., Geldenhuys, D., Crawford, R., Shannon, L., & Jarre, A. (2014) · African Journal of Marine Science · doi:10.2989/1814232x.2014.929027 · Cited by 17 · see citing works
Self-citationEspinaze, M. P. A., Hui, C., Waller, L. J., & Matthee, S. (2020) · Parasitology Research · doi:10.1007/s00436-020-06895-x · Cited by 13 · see citing works
Campbell, K. J., Farah, D., Collins, S. A., & Parsons, N. J. (2015) · Ostrich · doi:10.2989/00306525.2015.1108371 · Cited by 12 · see citing works
Wolfaardt, A., Underhill, L., & Crawford, R. (2009) · African Journal of Marine Science · doi:10.2989/ajms.2009.31.1.2.773 · Cited by 11 · see citing works
Self-citationHarding, C. T. (2014) · Open University of Cape Town (University of Cape Town) · Cited by 9 · see citing works
Otley, H. M., Tansell, J., & Scofield, R. P. (2017) · New Zealand Journal of Zoology · doi:10.1080/03014223.2017.1284135 · Cited by 7 · see citing works
Pichegru, L., Makoala, M. M., Barham, B. J., Barham, P., Dalton, D. L., Ludynia, K., Freeman, M., Geldenhuys, D., Hagen, C., Harris, G., et al. (2025) · Journal for Nature Conservation · doi:10.1016/j.jnc.2025.126919 · Cited by 3 · see citing works
The Decline and Conservation Status of the African Penguin
Grigg, J. L., & Sherley, R. B. (2022) · Elsevier eBooks · doi:10.1016/b978-0-12-821139-7.00220-8 · Cited by 3 · see citing works
Ecuador-Perú : acuerdos para una paz definitiva
Ortíz, R. D. (1999) · Virtual Defense Library (Ministerio de Defensa) · Cited by 2 · see citing works
Colour Abberations in African Penguins Spheniscus Demersus
Traisnel, G., Pichegru, L., Visser, H., & Edwards, L. (2018) · Marine Ornithology · doi:10.5038/2074-1235.46.1.1243 · Cited by 1 · see citing works
Robben Island penguin model extended to include further tag data and to estimate immigration
Robinson, W. M., & Butterworth, D. S. (2011) · Open University of Cape Town (University of Cape Town)
Stander, N., & Klusener, R. (2020) · doi:10.1002/9781119167792.ch13
Barquete, V., Pichegru, L., Cook, T. R., Kemper, J., Chilvers, B. L., & Ryan, P. G. (2026) · Endangered Species Research · doi:10.3354/esr01493
Christian, M., Oosthuizen, W. C., Ludynia, K., Barham, B. J., Barham, P., Sherley, R. B., & Altwegg, R. (2026) · Methods in Ecology and Evolution · doi:10.1111/2041-210x.70314
- Authors
- Whittington, P., Randall, R., Crawford, R., Wolfaardt, A., Klages, N., Randall, B., Bartlett, P., Chesselet, Y., & Jones, R.
- Affiliations
- Nelson Mandela University (ZA)
- South African National Parks (ZA)
- CapeNature (ZA)
- Ministy of Fisheries and Marine Resources (NA)
- ORCID
- Crawford, RJM
- Venue
- African Journal of Marine Science
- Published
- 2005-01
- Volume
- 27
- Issue
- 1
- Pages
- 205-213
- ISSN
- 1814-232X (ISSN-L)
- 1814-2338
- OpenAlex
- W2015771085
- Cited by
- 25
- References
- 13
- Citations by year
- 2026: 2 · 2025: 1 · 2022: 1 · 2020: 2 · 2017: 1 · 2015: 2 · 2014: 5 · 2012: 1
- FWCI
- 1.88
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- African Journal of Marine Science (publishedVersion)
- Nelson Mandela University Research Repository (submittedVersion)
- 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 › Ecology, Evolution, Behavior and Systematics › Animal Behavior and Reproduction
- Keywords
- African penguin, Spheniscus demersus, immigration, emigration, breeding colonies, natal dispersal, prey availability, seabird conservation
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