Influence of local and regional prey availability on breeding performance of African penguins Spheniscus demersus
Open accessAbstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 473:291-301 (2013) - DOI: https://doi.org/10.3354/meps10070 Influence of local and regional prey availability on breeding performance of African penguins Spheniscus demersus Richard B. Sherley1,3,9,*, Les G. Underhill1,2, Barbara J. Barham4, Peter J. Barham2,5, Janet C. Coetzee6, Robert J. M. Crawford2,7, Bruce M. Dyer7, T. Mario Leshoro8, Leshia Upfold7 1Marine Research Institute, and 2Animal Demography Unit, Department of Zoology, University of Cape Town, Rondebosch 7701, Cape Town, South Africa 3School of Biological Sciences, University of Bristol, Bristol BS8 1UG, UK 4Penguin Datasystems, Bristol BS6 6QS, UK 5H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK 6Branch Fisheries, Department of Agriculture, Forestry and Fisheries, Rogge Bay 8012, South Africa 7Oceans and Coasts, Department of Environmental Affairs, Rogge Bay 8012, South Africa 8Robben Island Museum, Robben Island 7400, South Africa 9Present address: Animal Demography Unit, Department of Zoology, University of Cape Town, Rondebosch 7701, Cape Town, South Africa *Email: richard.sherley@uct.ac.za ABSTRACT: Population trends of African penguins Spheniscus demersus in the Western Cape, South Africa, and their breeding success have been linked to the abundance of their main prey, sardine Sardinops sagax and anchovy Engraulis encrasicolus. During the late 1990s and early 2000s, both fish species increased markedly in abundance, but after 2004, sardine biomass decreased to below average levels. In addition, adults of both stocks were principally located to the east of Cape Agulhas from 2001 to 2009 and were thus distant from seabird colonies on South Africa's West Coast. The number of African penguin pairs counted at Robben Island from 2001 to 2009 and the fledging period of chicks from successful nests increased and decreased in apparent response to the biomass of sardine prior to each breeding season, possibly linked through adult condition at the onset of breeding. Breeding success and chick-fledging rates increased during the study period and showed positive relationships with local food availability, indexed through the annual industrial catch of anchovy made within 56 km (30 nautical miles) of the colony. In addition, chick-fledging rates were depressed in 2-chick broods during years when anchovy contributed <75% by mass to the diet of breeding birds. Previously reported relationships between the overall abundance of forage fish in South Africa and penguin breeding success were not supported. Taken together, these results highlight the combined importance of ensuring adequate local food availability for seabirds during the reproductive cycle and safeguarding regional prey abundance during the non-breeding season. KEY WORDS: Breeding performance · Fisheries–seabird interactions · Seabird conservation · Nesting success · Ecosystem approach Full text in pdf format Supplementary material PreviousCite this article as: Sherley RB, Underhill LG, Barham BJ, Barham PJ and others (2013) Influence of local and regional prey availability on breeding performance of African penguins Spheniscus demersus. Mar Ecol Prog Ser 473:291-301. https://doi.org/10.3354/meps10070 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 473. Online publication date: January 21, 2013 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2013 Inter-Research.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
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?
The duration of the fledging period varies as a function of both the local foraging conditions and the energy that parents can afford to invest in chick provisioning.
“The duration of the fledging period varies as a function of both the local foraging conditions and the energy that parents can afford to invest in chick provisioning [8], [48].”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [8]
In “Fledging success and fledging periods” (page unavailable), the authors assume that fledging duration responds to food availability and how quickly parents provision chicks. “Fledging periods” reports a relationship with sardine biomass, but the paper does not establish that parental energy available for provisioning independently determines fledging duration. The claim presents that proposed mechanism as an established finding. (LLM, conf=0.84)
Experimental — accuracy not yet measuredAbandonments could have been mediated either by poor food availability close to the colonies during chick-rearing, poor availability of adult fish during the preceding pre-breeding period, or a combination of the two.
“such that abandonments could have been mediated either by poor food availability close to the colonies during chick-rearing, poor availability of adult fish during the preceding pre-breeding period, or a combination of the two [8].”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [8]
The Discussion (page unavailable) proposes that pre-breeding condition, which may depend on adult fish stocks, interacts with prey availability near the colony to affect breeding success and chick provisioning. It does not specifically identify these factors as causes of abandonments, so that outcome is not established by this paper. (LLM, conf=0.82)
Experimental — accuracy not yet measuredChick growth rates show high plasticity in response to variable feeding conditions.
“but chick growth rates show high plasticity in response to variable feeding conditions [8], [11].”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [8]
The Fledging success and fledging periods section treats time to fledging as potentially responsive to food availability and parental provisioning. The Fledging periods results report variation in that time associated with prey biomass, but the paper does not directly measure chick growth rates or establish that their plasticity is high. (LLM, conf=0.83)
Experimental — accuracy not yet measuredIf poor prey availability persists, the subsequent survival and reproductive success of these birds would be compromised relative to birds at colonies where conditions are more favourable.
“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 [8]
The Discussion (page not available in our copy) reports that breeding success increased with local anchovy abundance and explains how scarce food can reduce chick fledging. It does not establish that persistent poor prey availability compromises the birds’ subsequent survival, or compare survival and reproductive success between colonies with poor and favourable conditions. (LLM, conf=0.84)
Experimental — accuracy not yet measuredAn increase in fledging periods, similar to that observed at Robben Island, may well have occurred at Dyer Island.
“and an increase in fledging periods, similar to that observed at Robben Island [8], may well have occurred.”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [8]
During good years, African penguins can successfully rear two broods in a season.
“During good years, African penguins can successfully rear two broods in a season”
From Hand-Rearing, Release and Survival of African Penguin Chicks Abandoned Before Independence by Moulting Parents (2014) · cites this paper as [8]
The Fledging success and fledging periods section (page unavailable) distinguishes one-chick from two-chick broods within a breeding attempt. The Discussion (page unavailable) addresses food availability and chick survival, but neither passage establishes that a pair can rear two separate broods in one season; a search for multiple broods and second breeding attempts found no such passage. (LLM, conf=0.77)
Experimental — accuracy not yet measured
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
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 · see citing works
Crawley, M. J. (2007) · Medical Entomology and Zoology · Cited by 5,431 · see citing works
Crawley, M. J. (2007) · Wiley eBooks · doi:10.1002/9780470515075 · Cited by 3,939 · see citing works
Climate and the match or mismatch between predator requirements and resource availability
Durant, J., Hjermann, D., Ottersen, G., & Stenseth, N. (2007) · Climate Research · doi:10.3354/cr033271 · Cited by 973 · see citing works
Capital and Income Breeding as Alternative Tactics of Resource Use in Reproduction
Jonsson, K., & Jonsson, K. (1997) · Oikos · doi:10.2307/3545800 · Cited by 869 · see citing works
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 · see citing works
Self-citationAre seabirds foraging for unpredictable resources?
Weimerskirch, H. (2007) · Deep Sea Research Part II Topical Studies in Oceanography · doi:10.1016/j.dsr2.2006.11.013 · Cited by 631 · see citing works
The Benguela Current: An ecosystem of four components
Hutchings, L., van der Lingen, C. D., Shannon, L. J., Crawford, R. J. M., Verheye, H. M., Bartholomae, C. H., van der Plas, A. K., Louw, D. C., Kreiner, A., Ostrowski, M., et al. (2009) · Progress In Oceanography · doi:10.1016/j.pocean.2009.07.046 · Cited by 500 · see citing works
Self-citationSeabirds as Indicators of Marine Food Supplies
Cairns, D. K. (1988) · Biological Oceanography · doi:10.1080/01965581.1987.10749517 · Cited by 399 · see citing works
Frederiksen, M., Wanless, S., Harris, M. P., ROTHERY, P., & Wilson, L. J. (2004) · Journal of Applied Ecology · doi:10.1111/j.0021-8901.2004.00966.x · Cited by 350 · see citing works
Furness, R., & Tasker, M. (2000) · Marine Ecology Progress Series · doi:10.3354/meps202253 · Cited by 336 · see citing works
Grémillet, D., Lewis, S., Drapeau, L., Van Der Lingen, C. D., Huggett, J. A., Coetzee, J. C., Verheye, H. M., Daunt, F., Wanless, S., & Ryan, P. G. (2008) · Journal of Applied Ecology · doi:10.1111/j.1365-2664.2007.01447.x · Cited by 269 · see citing works
Seabirds as indicators of marine food supplies: Cairns revisited
Piatt, J., Harding, A., Shultz, M. T., Speckman, S., Pelt, T. I. V., Drew, G. S., & Kettle, A. B. (2007) · Marine Ecology Progress Series · doi:10.3354/meps07078 · Cited by 264 · see citing works
Body Condition and Seabird Reproductive Performance: A Study of Three Petrel Species
Chastel, O., Weimerskirch, H., & Jouventin, P. (1995) · Ecology · doi:10.2307/1941698 · Cited by 246 · see citing works
Making protected area networks effective for marine top predators
Hooker, S. K., Cañadas, A., Hyrenbach, K. D., Corrigan, C. M., Polovina, J., & Reeves, R. (2010) · Endangered Species Research · doi:10.3354/esr00322 · Cited by 203 · see citing works
Has 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 · see citing works
Self-citationFlexible time budgets in breeding Common Murres: Buffers against variable prey availability
Burger, A. E., & Piatt, J. F. (1990) · Studies in avian biology · Cited by 169 · see citing works
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-citationRoy, 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 · see citing works
Self-citationSuryan, R. M., Irons, D., Kaufman, M., Benson, J., Jodice, P. G. R., Roby, D. D., & Brown, E. (2002) · Marine Ecology Progress Series · doi:10.3354/meps236273 · Cited by 129 · see citing works
Ropert‐Coudert, Y., Wilson, R. P., Daunt, F., & Kato, A. (2004) · Behavioral Ecology · doi:10.1093/beheco/arh086 · Cited by 116 · see citing works
Crawford, R. J. M., Barham, P. J., Underhill, L. G., Shannon, L. J., Coetzee, J. C., Dyer, B. M., Leshoro, T. M., & Upfold, L. (2006) · Biological Conservation · doi:10.1016/j.biocon.2006.03.019 · Cited by 108 · see citing works
Self-citationIndustrial fishing, no-take zones and endangered penguins
Pichegru, L., Ryan, P. G., van Eeden, R., Reid, T. A., Grémillet, D., & Wanless, R. M. (2011) · Biological Conservation · doi:10.1016/j.biocon.2011.12.013 · Cited by 100 · see citing works
Pichegru, L., Ryan, P. G., Bohec, C. L., van der Lingen, C., Navarro, R. A., Petersen, S., Lewis, S., van der Westhuizen, J., & Grémillet, D. (2009) · Marine Ecology Progress Series · doi:10.3354/meps08283 · Cited by 99 · see citing works
Fairweather, 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 · see citing works
Ballard, G., Dugger, K. M., Nur, N., & Ainley, D. G. (2010) · Marine Ecology Progress Series · doi:10.3354/meps08514 · Cited by 91 · see citing works
Montevecchi, W. A. (2007) · Marine Ecology Progress Series · doi:10.3354/meps07075 · Cited by 84 · see citing works
Suryan, R. M., Irons, D. B., & Benson, J. (2000) · Ornithological Applications · doi:10.1650/0010-5422(2000)102[0374:psavfs]2.0.co;2 · Cited by 82 · see citing works
Responses 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 · see citing works
Quillfeldt, P., Strange, I. J., & Masello, J. F. (2007) · Journal of Avian Biology · doi:10.1111/j.2007.0908-8857.03846.x · Cited by 76 · see citing works
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 · 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-citationSaraux, C., Laverick, S., Maho, Y. L., Ropert‐Coudert, Y., & Chiaradia, A. (2011) · Ecology · doi:10.1890/11-0407.1 · Cited by 68 · see citing works
Population 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 · see citing works
Self-citationROBINSON, S., Chiaradia, A., & Hindell, M. A. (2005) · Ibis · doi:10.1111/j.1474-919x.2005.00431.x · Cited by 59 · see citing works
Ludynia, 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 · 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., 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
Self-citationBarham, P. J., Underhill, L. G., Crawford, R. J. M., & Leshoro, T. M. (2007) · Emu - Austral Ornithology · doi:10.1071/mu06028 · Cited by 45 · see citing works
Self-citation(1981) · African Journal of Wildlife Research · Cited by 45 · see citing works
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 · see citing works
Self-citationEcosystem approach to fisheries management in the southern Benguela: a workshop overview
Shannon, L. J., Cochrane, K. L., Moloney, C. L., & Fréon, P. (2004) · African Journal of Marine Science · doi:10.2989/18142320409504046 · Cited by 37 · see citing works
Barham, 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 · see citing works
Self-citationEstimates of daily ration for the South African (Cape) fur seal
Balmelli, M., & Wickens, P. A. (1994) · South African Journal of Marine Science · doi:10.2989/025776194784287111 · Cited by 33 · see citing works
Hatching asynchrony and brood reduction in the jackass penguin: an experimental study
Seddon, P. J., & van Heezik, Y. M. (1991) · Animal Behaviour · doi:10.1016/s0003-3472(05)80034-x · Cited by 31 · see citing works
Durant, J. M., Crawford, R., Wolfaardt, A., Agenbag, K. J., Visagie, J., Upfold, L., & Stenseth, N. C. (2010) · Marine Ecology Progress Series · doi:10.3354/meps08857 · Cited by 27 · see citing works
Self-citationStienen, E. W. M., & Brenninkmeijer, A. (2006) · Journal für Ornithologie · doi:10.1007/s10336-006-0075-3 · Cited by 21 · see citing works
BEHAVIOUR OF THE JACKASS PENGUIN CHICK
Seddon, P. J., & van Heezik, Y. (1993) · Ostrich · doi:10.1080/00306525.1993.9634188 · Cited by 19 · see citing works
Schülein, F. H., Boyd, A. J., & Underhill, L. G. (1995) · South African Journal of Marine Science · doi:10.2989/02577619509504834 · Cited by 18 · see citing works
Self-citationvan Heezik, Y. M., & Seddon, P. J. (1996) · Animal Behaviour · doi:10.1006/anbe.1996.0141 · Cited by 13 · see citing works
Suryan, R. M., Irons, D. B., & Benson, J. (2000) · Ornithological Applications · doi:10.2307/1369650 · Cited by 8 · see citing works
Flagged first, then by citations
1 of the 52 references couldn’t be matched to a known paper.
Research works printed but not linked: 1
- Orians GH, Pearson NE (1979) On the theory of central place foraging. In: Horn DJ, Mitchell RD, Stairs GR (eds) Analysis of ecological systems. Ohio State University Press, Colombus, OH, p 154-177
Cited by
Sorted by citations
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 148 · see citing works
Self-citationBest practices for assessing forage fish fisheries-seabird resource competition
Sydeman, W. J., Thompson, S. A., Anker‐Nilssen, T., Arimitsu, M. L., Bennison, A., Bertrand, S., Boersch‐Supan, P. H., Boyd, C., Bransome, N. C., Crawford, R. J. M., et al. (2017) · Fisheries Research · doi:10.1016/j.fishres.2017.05.018 · Cited by 78 · see citing works
Self-citationSherley, R. B., Barham, B. J., Barham, P., Campbell, K. J., Crawford, R. J. M., Grigg, J. L., Horswill, C., McInnes, A., Morris, T. L., Pichegru, L., et al. (2018) · Proceedings of the Royal Society B Biological Sciences · doi:10.1098/rspb.2017.2443 · Cited by 76 · 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
Dietary studies in birds: testing a non‐invasive method using digital photography in seabirds
Gaglio, D., Cook, T. R., Connan, M., Ryan, P. G., & Sherley, R. B. (2016) · Methods in Ecology and Evolution · doi:10.1111/2041-210x.12643 · Cited by 56 · see citing works
Self-citationCrawford, R. J. M., Makhado, A. B., Whittington, P. A., Randall, R. M., Oosthuizen, W. H., & Waller, L. J. (2015) · Frontiers in Ecology and Evolution · doi:10.3389/fevo.2015.00010 · Cited by 54 · see citing works
Self-citationDiez, M. J., Cabreira, A. G., Madirolas, A., Nascimento, J. M. D., Scioscia, G., Schiavini, A., & Lovrich, G. A. (2018) · Polar Biology · doi:10.1007/s00300-018-2394-2 · Cited by 53 · see citing works
Bottom-up effects of a no-take zone on endangered penguin demographics
Sherley, R. B., Winker, H., Altwegg, R., van der Lingen, C. D., Votier, S. C., & Crawford, R. J. M. (2015) · Biology Letters · doi:10.1098/rsbl.2015.0237 · Cited by 52 · 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
Self-citationWeller, 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-citationApplying science to pressing conservation needs for penguins
Boersma, P. D., Borboroglu, P. G., Gownaris, N. J., Bost, C., Chiaradia, A., Ellis, S., Schneider, T., Seddon, P. J., Simeone, A., Trathan, P. N., et al. (2019) · Conservation Biology · doi:10.1111/cobi.13378 · Cited by 44 · see citing works
Crawford, R. J., Makhado, A. B., Waller, L. J., & Whittington, P. A. (2014) · Ostrich · doi:10.2989/00306525.2014.955141 · Cited by 39 · 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
Self-citationWeller, F. G., Sherley, R. B., Waller, L. J., Ludynia, K., Geldenhuys, D., Shannon, L. J., & Jarre, A. (2016) · Ecological Modelling · doi:10.1016/j.ecolmodel.2016.01.011 · Cited by 32 · see citing works
Self-citationHorswill, C., Trathan, P. N., & Ratcliffe, N. (2017) · PLoS ONE · doi:10.1371/journal.pone.0184114 · Cited by 33 · see citing works
McInnes, A., Ryan, P. G., Lacerda, M., Deshayes, J., Goschen, W. S., & Pichegru, L. (2017) · Marine Ecology Progress Series · doi:10.3354/meps12089 · Cited by 32 · see citing works
Does it always pay to defend one's nest? A case study in African penguin
Traisnel, G., & Pichegru, L. (2018) · Ethology · doi:10.1111/eth.12704 · Cited by 31 · see citing works
Crawford, R. J. M., Sydeman, W. J., Thompson, S. A., Sherley, R. B., & Makhado, A. B. (2019) · ICES Journal of Marine Science · doi:10.1093/icesjms/fsz081 · Cited by 25 · see citing works
Self-citationLuck in Food Finding Affects Individual Performance and Population Trajectories
Wilson, R. P., Neate, A., Holton, M. D., Shepard, E. L. C., Scantlebury, D. M., Lambertucci, S. A., di Virgilio, A., Crooks, E., Mulvenna, C. C., & Marks, N. J. (2018) · Current Biology · doi:10.1016/j.cub.2018.10.034 · Cited by 26 · see citing works
PROGNOSTIC INDICATORS OF REHABILITATION OUTCOMES FOR ADULT AFRICAN PENGUINS (SPHENISCUS DEMERSUS)
Parsons, N. J., Vanstreels, R. E. T., & Schaefer, A. M. (2017) · Journal of Wildlife Diseases · doi:10.7589/2017-06-146 · Cited by 25 · see citing works
Health evaluation of African penguins (Spheniscus demersus) in southern Africa
Parsons, N. J., Gous, T. A., Schaefer, A. M., & Vanstreels, R. E. T. (2016) · Onderstepoort Journal of Veterinary Research · doi:10.4102/ojvr.v83i1.1147 · Cited by 24 · see citing works
Bottom-up and top-down control of the Benguela ecosystem's seabirds
Crawford, R. J. M., Makhado, A. B., & Oosthuizen, W. H. (2017) · Journal of Marine Systems · doi:10.1016/j.jmarsys.2017.04.004 · Cited by 23 · see citing works
Self-citationRebstock, G. A., & Boersma, P. D. (2018) · Marine Ecology Progress Series · doi:10.3354/meps12668 · Cited by 24 · see citing works
Parsons, N. J., Schaefer, A. M., van der Spuy, S., & Gous, T. A. (2015) · Journal of the South African Veterinary Association · doi:10.4102/jsava.v86i1.1198 · Cited by 22 · see citing works
Pereira, J. M., Paiva, V. H., Ceia, F. R., & Ramos, J. A. (2020) · Regional Environmental Change · doi:10.1007/s10113-020-01662-1 · Cited by 22 · see citing works
Chastant, J. E., & Gawlik, D. E. (2018) · Waterbirds · doi:10.1675/063.041.0105 · Cited by 22 · see citing works
The initial journey of an endangered penguin: implications for seabird conservation
Sherley, R., Ludynia, K., Lamont, T., Roux, J., Crawford, R., & Underhill, L. (2013) · Endangered Species Research · doi:10.3354/esr00510 · Cited by 20 · see citing works
Self-citationConnan, M., Hofmeyr, G. J. G., & Pistorius, P. A. (2016) · PLoS ONE · doi:10.1371/journal.pone.0159402 · Cited by 20 · see citing works
Traisnel, G., & Pichegru, L. (2018) · Marine Ecology Progress Series · doi:10.3354/meps12827 · Cited by 18 · see citing works
Growth and decline of a penguin colony and the influence on nesting density and reproductive success
Sherley, R. B., Barham, P., Barham, B. J., Crawford, R. J. M., Dyer, B. M., Leshoro, T. M., Makhado, A. B., Upfold, L., & Underhill, L. G. (2013) · Population Ecology · doi:10.1007/s10144-013-0394-1 · Cited by 18 · see citing works
Self-citationA condition index for African penguin Spheniscus demersus chicks
Lubbe, A., Underhill, L. G., Waller, L., & Veen, J. (2014) · African Journal of Marine Science · doi:10.2989/1814232x.2014.915232 · Cited by 18 · see citing works
Self-citationEnvironmental influences on breeding biology and pup production in Australian fur seals
Geeson, J. J., Hobday, A. J., Speakman, C. N., & Arnould, J. P. Y. (2022) · Royal Society Open Science · doi:10.1098/rsos.211399 · Cited by 17 · see citing works
Ludynia, 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-citationHorton, T. W., Block, B. A., Davies, R., Hawkes, L. A., Jones, D., Jones, H., Leeves, K., Maoiléidigh, N. Ó., Righton, D. A., van der Kooij, J., et al. (2021) · ICES Journal of Marine Science · doi:10.1093/icesjms/fsab039 · Cited by 15 · see citing works
Scheun, J., Gulson, J., & Ganswindt, A. (2020) · General and Comparative Endocrinology · doi:10.1016/j.ygcen.2020.113539 · Cited by 14 · see citing works
Costalago, D., Potter, P., Pattrick, P., & Strydom, N. A. (2017) · Environmental Biology of Fishes · doi:10.1007/s10641-017-0693-z · Cited by 13 · see citing works
Intercolony variation in reproductive skipping in the African penguin
Leith, F. W., Grigg, J. L., Barham, B. J., Barham, P., Ludynia, K., McGeorge, C., Mdluli, A., Parsons, N. J., Waller, L. J., & Sherley, R. B. (2022) · Ecology and Evolution · doi:10.1002/ece3.9255 · Cited by 11 · see citing works
Self-citationVanstreels, R. E. T., Parsons, N. J., Pistorius, P. A., & Schaefer, A. M. (2019) · Journal of Wildlife Diseases · doi:10.7589/2018-05-134 · Cited by 11 · see citing works
Carpenter‐Kling, T., de Blocq, A. D., Hagen, C., Harding, C. T., Morris, T. L., Pichegru, L., Roberts, J., Ryan, P. G., Wanless, R. M., & McInnes, A. (2022) · Scientific Reports · doi:10.1038/s41598-022-12969-w · Cited by 10 · see citing works
African Penguins and Localized Fisheries Management: Response to Butterworth and Ross-Gillespie
Sydeman, W. J., Hunt, G. L., Pikitch, E. K., Parrish, J. K., Piatt, J. F., Boersma, P. D., Kaufman, L., Anderson, D. W., Thompson, S. A., & Sherley, R. B. (2022) · ICES Journal of Marine Science · doi:10.1093/icesjms/fsac116 · Cited by 9 · see citing works
Self-citationManno, K. L., Loh, G., & van Heezik, Y. (2014) · Austral Ecology · doi:10.1111/aec.12115 · Cited by 9 · see citing works
Body condition as a quantitative tool to guide hand‐rearing decisions in an endangered seabird
Morten, J. M., Parsons, N. J., Schwitzer, C., Holderied, M. W., & Sherley, R. B. (2017) · Animal Conservation · doi:10.1111/acv.12338 · Cited by 9 · see citing works
Self-citationHarding, C. T. (2014) · Open University of Cape Town (University of Cape Town) · Cited by 9 · see citing works
Penguin modelling approach queried
Butterworth, D. S., Plagányi, É. E., Robinson, W. M., Moosa, N., & Moor, C. L. D. (2015) · Ecological Modelling · doi:10.1016/j.ecolmodel.2015.08.001 · Cited by 8 · see citing works
Scott, R., MacPherson, B., & Gras, R. (2018) · Journal of Theoretical Biology · doi:10.1016/j.jtbi.2018.09.019 · Cited by 8 · see citing works
Chastant, J. E., Petersen, M. L., & Gawlik, D. E. (2016) · Hydrobiologia · doi:10.1007/s10750-016-3015-0 · Cited by 7 · see citing works
Survival estimates for the greater crested ternThalasseus bergiiin southern Africa
Payo‐Payo, A., Sanz‐Aguilar, A., Gaglio, D., Sherley, R. B., Cook, T. R., Altwegg, R., & Ryan, P. G. (2018) · African Journal of Marine Science · doi:10.2989/1814232x.2018.1437470 · Cited by 7 · see citing works
Self-citationHickcox, R. P., Mattern, T., Young, M. J., Rodríguez‐Recio, M., van Heezik, Y., & Seddon, P. J. (2023) · Biological Conservation · doi:10.1016/j.biocon.2023.110197 · Cited by 6 · see citing works
Ruiz‐Villar, H., López‐Bao, J. V., & Palomares, F. (2023) · Mammal Research · doi:10.1007/s13364-023-00708-z · Cited by 5 · see citing works
Decades of artificial nests towards African penguin conservation—Have they made a difference?
Pichegru, L., Sherley, R. B., Malan, T., Barham, B. J., Ludynia, K., Geldenhuys, D., Amos, K., Barham, P., Drost, E., Hahndiek, V., et al. (2024) · Ecological Solutions and Evidence · doi:10.1002/2688-8319.12388 · Cited by 5 · see citing works
Self-citationMcGregor, E. S. (2015) · Open University of Cape Town (University of Cape Town) · Cited by 5 · see citing works
Weller, F. G., Sherley, R. B., Shannon, L. J., Jarre, A., Stewart, T. J., Scott, L., Altwegg, R., Cecchini, L.-A., Crawford, R. J. M., Geldenhuys, D., et al. (2016) · Ecological Modelling · doi:10.1016/j.ecolmodel.2016.06.002 · Cited by 4 · see citing works
Self-citationMarti-Colombas, M., Sánchez‐Calabuig, M. J., Castaño, C., Toledano‐Díaz, A., Martínez‐Nevado, E., López-Goya, A., & Santiago‐Moreno, J. (2022) · Animal Reproduction Science · doi:10.1016/j.anireprosci.2022.106933 · Cited by 4 · 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
Self-citationThe 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
Self-citationMnyekemfu, M., Barham, P., Barham, B. J., Waller, L. J., Ludynia, K., & Maneveldt, G. W. (2023) · Ostrich · doi:10.2989/00306525.2023.2247167 · Cited by 2 · see citing works
Self-citationWatermeyer, K. E., Jarre, A., Shannon, L. J., Mulumba, P., & Botha, J. (2018) · Ecological Modelling · doi:10.1016/j.ecolmodel.2017.12.017 · Cited by 2 · see citing works
Froehlich, F., Forbes, N., Carrasco, D. C., Ludynia, K., Parsons, N. J., Worsfold, R. D., & Dutton, T. (2023) · Journal of Avian Medicine and Surgery · doi:10.1647/d-20-00101 · Cited by 1 · see citing works
African penguin Spheniscus demersus foraging on juvenile fish in jellyfish tentacles
Glencross, J. S., Jewell, A., Grigg, J. L., McInnes, A., Brierley, A. S., & Sherley, R. B. (2024) · Seabird Journal · doi:10.61350/sbj.36.5 · Cited by 1 · see citing works
Self-citationContributions of Zoo-Based Reproductive Research to Marine Animal Conservation
O’Brien, J. K., Steinman, K. J., Montano, G. A., & Robeck, T. R. (2018) · Cambridge University Press eBooks · doi:10.1017/9781108183147.021 · Cited by 1 · see citing works
Butterworth, D. S. (2022) · Open University of Cape Town (University of Cape Town) · doi:10.25375/uct.19390688
Reproductive skipping behaviour in the African penguin (Spheniscus demersus)Preprint
Leith, F. W., Grigg, J., Barham, B. J., Barham, P., Ludynia, K., McGeorge, C., Mdluli, A., Parsons, N. J., Waller, L. J., & Sherley, R. B. (2022) · doi:10.22541/au.164803453.37037602/v1
Self-citationA dataset on worldwide penguin diet
Ramı́rez, F., Aparicio-Estalella, C., Gimeno, M., & Marta Coll, M. (2025) · Scientific Data · doi:10.1038/s41597-025-06458-8
Gwatkin, G., Hickcox, R. P., Niebuhr, C. N., Strang, A. J., Flanagan, S. P., & Larue, M. A. (2026) · Journal of Wildlife Management · doi:10.1002/jwmg.70230
- Authors
- Sherley, R., Underhill, L., Barham, B., Barham, P., Coetzee, J., Crawford, R., Dyer, B., Leshoro, T., & Upfold, L.
- Affiliations
- University of Cape Town (ZA)
- Government of South Africa (ZA)
- ORCID
- Crawford, RJM
- Venue
- Marine Ecology Progress Series
- Publisher
- Inter-Research Science Center
- Published
- 2013-01-21
- Volume
- 473
- Pages
- 291-301
- ISSN
- 0171-8630 (ISSN-L)
- 1616-1599
- OpenAlex
- W2332974808
- Cited by
- 65
- References
- 52
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 2 · 2023: 4 · 2022: 8 · 2021: 1 · 2020: 2 · 2019: 5 · 2018: 10 · 2017: 8 · 2016: 6 · 2015: 6 · 2014: 8 · 2013: 2
- FWCI
- 4.54
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Marine Ecology Progress Series (publishedVersion)
- Funders
- Earthwatch Institute
- Leverhulme Trust
- National Research Foundation
- Topics
- Physical Sciences › Environmental Science › Ecology › Avian ecology and behavior
- Physical Sciences › Environmental Science › Ecology › Marine animal studies overview
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Keywords
- African penguin, Spheniscus demersus, breeding performance, prey availability, sardine, anchovy, Sardinops sagax, Engraulis encrasicolus, fish stock depletion, seabird population trends, Cape Agulhas, Western Cape
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
