Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Bruce M. Dyer"'
Autor:
Richard B. Sherley, Robert J. M. Crawford, Andrew D. deBlocq, Bruce M. Dyer, Deon Geldenhuys, Christina Hagen, Jessica Kemper, Azwianewi B. Makhado, Lorien Pichegru, Desmond Tom, Leshia Upfold, Johan Visagie, Lauren J. Waller, Henning Winker
Publikováno v:
Ecology and Evolution, Vol 10, Iss 15, Pp 8506-8516 (2020)
Abstract Understanding changes in abundance is crucial for conservation, but population growth rates often vary over space and time. We use 40 years of count data (1979–2019) and Bayesian state‐space models to assess the African penguin Spheniscu
Externí odkaz:
https://doaj.org/article/d91bbe115d03443a8669a418fd797ea2
Autor:
Oluwadunsin E. Adekola, Peter G. Ryan, Robert J. M. Crawford, Leshia Upfold, Bruce M. Dyer, Azwianewi B. Makhado
Publikováno v:
Ostrich. 92:295-306
Little has been reported on moult in sulids, including gannets. The Cape Gannet Morus capensis is an endangered seabird endemic to southern Africa. We describe the timing, duration, symmetry and se...
Autor:
R. J. M. Crawford, Peter G. Ryan, Bruce M. Dyer, F.E. Dakwa, Azwianewi B. Makhado, Pierre A. Pistorius
Publikováno v:
African Journal of Marine Science. 43:187-199
Populations of the macaroni penguin Eudyptes chrysolophus and the eastern rockhopper penguin E. filholi breeding at Marion Island (Prince Edward Islands) in the sub-Antarctic Indian Ocean decreased from 1994 to 2018. We examined their diets when rear
Autor:
Bruce M. Dyer, Rory Crawford, S. Somhlaba, John Cooper, Andrew C. Cockcroft, Richard B. Sherley, L Upfold, Azwianewi B. Makhado
Publikováno v:
Ostrich. 90:373-390
The Bank Cormorant Phalacrocorax neglectus is endemic to the Benguela upwelling ecosystem off southwest Africa and is classified as Endangered owing to a recent large reduction in its number. It is...
Autor:
Jean-Paul Roux, Peter G. Ryan, Azwianewi B. Makhado, Desmond Tom, Robert J. M. Crawford, Jessica Kemper, Makhudu Masotla, Bruce M. Dyer, Richard B. Sherley, Lorien Pichegru, Pierre A. Pistorius, Henning Winker, Leshia Upfold
Publikováno v:
Ostrich: Journal of African Ornithology; Vol 90, No 4 (2019); 335–346
The Cape Gannet Morus capensis is one of several seabird species endemic to the Benguela upwelling ecosystem (BUS) but whose population has recently decreased, leading to an unfavourable IUCN Red List assessment. Application of ‘JARA’ (‘Just An
Autor:
A. C. Wolfaardt, Jonathan Handley, Rjm Crawford, Maëlle Connan, W Froneman, Pierre A. Pistorius, M. Sigqala, Tarron Lamont, Bruce M. Dyer, Marietjie Landman, Tegan Carpenter-Kling, A.B. Makhado
Publikováno v:
Ecological Indicators. 101:163-172
Some upper trophic level predators, such as marine mammals, seabirds and large predatory fish have been shown to be useful sentinels for marine ecosystems. Through their demography, diet and foraging behaviour, ecosystem changes associated with clima
Autor:
Les G. Underhill, Antje Steinfurth, Katrin Ludynia, Bruce M. Dyer, Janet Coetzee, Johan Rademan, Kate J. Campbell, Richard B. Sherley, Leshia Upfold, Dagmar Merkle, Azwianewi B. Makhado
Publikováno v:
Journal of Applied Ecology. 56:1751-1760
Understanding the functional relationship between marine predators and their prey is vital to inform ecosystem‐based management. However, collecting concurrent data on predator behaviour and their prey at relevant scales is challenging. Moreover, o
Autor:
Peter G. Ryan, Leshia Upfold, Bruce M. Dyer, Henri Weimerskirch, Rjm Crawford, Maria P. Dias, Pierre A. Pistorius, Ryan R. Reisinger, Tarron Lamont, Azwianewi B. Makhado
Publikováno v:
Emu
Emu, CSIRO Publishing, 2018, pp.1-10. ⟨10.1080/01584197.2018.1469959⟩
Emu, CSIRO Publishing, 2018, pp.1-10. ⟨10.1080/01584197.2018.1469959⟩
International audience; Demographic parameters of wild animals are often closely associated with their foraging distribution and behaviour, and understanding these attributes can assist in identifying causes of population changes. The Indian Yellow-n
Autor:
Richard B. Sherley, Danie van Zyl, Andrew C. Cockcroft, Les G. Underhill, Bruce M. Dyer, Robert J. M. Crawford, Timothée R. Cook, Philna Botha, Peter G. Ryan
Publikováno v:
Conservation Biology. 31:1312-1321
Human activities are important drivers of marine ecosystem functioning. However, separating the synergistic effects of fishing and environmental variability on the prey base of nontarget predators is difficult, often because prey availability estimat
Autor:
Robert J. M. Crawford, Bruce M. Dyer, Azwianewi B. Makhado, Pierre A. Pistorius, Ryan R. Reisinger, Mark A. Hindell
Publikováno v:
Ecology and Evolution
King penguins make up the bulk of avian biomass on a number of sub‐Antarctic islands where they have a large functional effect on terrestrial and marine ecosystems. The same applies at Marion Island where a substantial proportion of the world popul