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Documents disponibles écrits par cet auteur (12)
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Article
Albert Snyman, Auteur ; Arne Purves, Auteur ; Alison Kock, Auteur ; Mashudu H. Mashau, Auteur ; Faroeshka Rodgers, Auteur ; Katrin Ludynia, AuteurThe African Penguin Spheniscus demersus, a critically endangered seabird endemic to southern Africa, faces substantial threats from terrestrial predators at its mainland colonies. Correct identification of the predator species is essential for e[...]
Article
Anna Zanoli, Auteur ; Chiara Tenneriello, Auteur ; Ilaria Morandi, Auteur ; Francesca Terranova, Auteur ; Melissa Cadman, Auteur ; Katrin Ludynia, Auteur ; Nicolas Mathevon, Auteur ; David Reby, Auteur ; Livio Favaro, AuteurAvian begging calls mediate parent–offspring conflict and direct parental care to genetically related progeny. We found that the fundamental frequency of begging calls of African Penguins Spheniscus demersus decreases as the penguins age and gai[...]
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Richard B Sherley, Auteur ; Azwianewi B Makhado, Auteur ; Robert JM Crawford, Auteur ; Christina Hagen, Auteur ; Jessica Kemper, Auteur ; Katrin Ludynia, Auteur ; Makhudu J Masotla, Auteur ; Alistair McInnes, Auteur ; Lorien Pichegru, Auteur ; Desmond Tom, Auteur ; Leshia Upfold, Auteur ; Lauren J Waller, AuteurThe African Penguin Spheniscus demersus has been considered a threatened species since 1984 and, aside from a short period around 2000, its population has been in constant decline since at least the 1950s. By combining counts of the numbers of b[...]
Article
Mpumalanga Mnyekemfu, Auteur ; Peter J. Barham, Auteur ; Barbara Barham, Auteur ; Lauren Waller, Auteur ; Katrin Ludynia, Auteur ; Gavin W. Maneveldt, AuteurThe Endangered African Penguin Spheniscus demersus is in serious decline, with the total population falling at a rate of similar to 5% per annum. The need to carry out regular monitoring to collect demographic and phenological data to assist in [...]
Article
Jesse Phillips, Auteur ; Katrin Ludynia, Auteur ; Lauren J. Waller, Auteur ; Peter J. Barham, Auteur ; Andile Mdluli, Auteur ; Romy Klusener, Auteur ; Gavin W. Maneveldt, AuteurThe population of the endangered Cape Cormorant Phalacrocorax capensis more than halved over the last three decades (BirdLife International 2018a). In January 2021, nearly 2 000 Cape Cormorant chicks were found abandoned, suffering from dehydrat[...]
Article
Livio Favaro, Auteur ; Eleonora Cresta, Auteur ; Olivier Friard, Auteur ; Katrin Ludynia, Auteur ; Nicolas Mathevon, Auteur ; Lorien Pichegru, Auteur ; David Reby, Auteur ; Marco Gamba, AuteurAfrican Penguins Spheniscus demersus are endangered and declining seabirds which make extensive use of vocal signals for intra-specific vocal communication. Accordingly, passive acoustic monitoring tools could be developed as robust population m[...]
Article
Ralph Eric Thijl Vanstreels, Auteur ; Lorien Pichegru, Auteur ; Maya C. Pfaff, Auteur ; Albert Snyman, Auteur ; Bruce M. Dyer, Auteur ; Nola J. Parsons, Auteur ; David G. Roberts, Auteur ; Katrin Ludynia, Auteur ; Azwianewi Makhado, Auteur ; Pierre A. Pistorius, AuteurAfrican penguins (Spheniscus demersus) are pursuit-diving seabirds endemic to the coast of southern Africa. In this study, we investigate the presence of seashells and anthropogenic debris (e.g. plastic, glass, nylon) in the stomach contents of [...]
Article
Richard B. Sherley, Auteur ; Fitsum Abadi, Auteur ; Katrin Ludynia, Auteur ; Barbara J. Barham, Auteur ; Allan E. Clark, Auteur ; Res Altwegg, AuteurReliable estimates of survival and dispersal are crucial to understanding population dynamics, but for seabirds, in which some individuals spend years away from land, mortality and emigration are often confounded. Multistate mark-recapture metho[...]
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Katrin Ludynia, Auteur ; Stefan Garthe, Auteur ; Guillermo Luna-Jorquera, AuteurThe Peruvian Booby (Sula variegata) is one of the most numerous guano bird species in the Humboldt Current. We used a combination of data logger deployment, at-sea observations and colony-based work to investigate the foraging and diving behavio[...]
Article
Nina Dehnhard, Auteur ; Maud Poisbleau, Auteur ; Laurent Demongin, Auteur ; Katrin Ludynia, Auteur ; Petra Quillfeldt, AuteurJuvenile survival is an important demographic parameter. Southern Rockhopper Penguins Eudyptes chrysocome have undergone a dramatic population decline in the past century across their distribution, but the demographic processes are poorly unders[...]
Article
Katrin Ludynia, Auteur ; Jessica Kemper, Auteur ; Jean-Paul Roux, AuteurMarine Protected Areas are important tools for the conservation and management of marine ecosystems, including top predators. The Namibian Islands' Marine Protected Area (NIMPA) primarily aims to improve the status of threatened seabird species [...]
Article
Richard B. Sherley, Auteur ; Katrin Ludynia, Auteur ; Les G. Underhill, Auteur ; Rian Jones, Auteur ; Jessica Kemper, AuteurThe Bank Cormorant Phalacrocorax neglectus is endemic to the Benguela Upwelling System of southern Africa. Most breeding colonies occur on offshore rocks, islands or man-made structures close to the high-water mark. Despite adaptations for breed[...]
