Zobrazeno 1 - 10
of 24
pro vyhledávání: '"B. M. Dyer"'
Autor:
Robert J. M. Crawford, Desmond Tom, Jessica Kemper, Rodney Braby, Alistair M. McInnes, Azwianewi B. Makhado, B. M. Dyer
The Benguela Current is used by c. 82 seabird species, of which seven are endemic to it. Eggs and guano of formerly abundant seabirds were heavily harvested in the 19th and 20th centuries but decreases in seabird populations led to cessation of these
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3360ba289f493d985f8c1fe77a810c6a
http://www.intechopen.com/articles/show/title/seabirds-of-the-benguela-ecosystem-utilisation-long-term-changes-and-challenges
http://www.intechopen.com/articles/show/title/seabirds-of-the-benguela-ecosystem-utilisation-long-term-changes-and-challenges
Autor:
Deon Geldenhuys, J Visagie, Christina Hagen, Lauren J. Waller, Lorien Pichegru, Henning Winker, B. M. Dyer, Leshia Upfold, Desmond Tom, Andrew D. de Blocq, Richard B. Sherley, Azwianewi B. Makhado, Jessica Kemper, Robert J. M. Crawford
Publikováno v:
Ecology and Evolution, Vol 10, Iss 15, Pp 8506-8516 (2020)
Ecology and Evolution
Ecology and Evolution
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 Spheniscus demersu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::637531d703e3abed1fb6b142e61c27e9
Autor:
Peter J. Barham, Res Altwegg, Duncan A. Bolton, Les G. Underhill, Robert J. M. Crawford, B. M. Dyer, L Upfold, T. Mario Leshoro
Publikováno v:
Bird Conservation International. 18:144-152
Some 2,000 orphaned chicks of African Penguins Spheniscus demersus were hand-reared and released back into the wild on Robben and Dassen Islands following the Treasure oil spill in June 2000. Of these chicks, 1,787 were flipper banded. This paper rep
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::583bf8460092a048a6c017d45d8771d4
https://doi.org/10.1017/s0959270908000142
https://doi.org/10.1017/s0959270908000142
Autor:
Rjm Crawford, PA Whittington, KJ Roxburg, Anthony J. Tree, AP Martin, L Upfold, J Visagie, B. M. Dyer
Publikováno v:
African Journal of Marine Science. 30:189-193
There have been recent changes in the distributions of several seabirds in South Africa. In the mid-1990s, breeding of Leach's storm petrel Oceanodroma leucorhoa was recorded in the Western Cape, the first record for the Southern Hemisphere. There wa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d77bcf17b9cadbeec63ca1d4231714db
https://doi.org/10.2989/ajms.2008.30.1.20.470
https://doi.org/10.2989/ajms.2008.30.1.20.470
Publikováno v:
African Journal of Marine Science. 30:161-166
In South Africa's Western Cape Province, numbers of bank cormorants Phalacrocorax neglectus breeding at 11 localities decreased from above 500 pairs during 1978–1987 to 350 pairs from 1995 to 2006. The most northern colony (Lambert's Bay) was extin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c470131165a92147bb33185d0896acd6
https://doi.org/10.2989/ajms.2008.30.1.16.466
https://doi.org/10.2989/ajms.2008.30.1.16.466
Publikováno v:
African Journal of Marine Science. 30:185-188
For rockhopper penguins Eudyptes chrysocome at Marion Island, there were significant decreases over time in the numbers breeding and breeding success at three monitored colonies from 1985/1986 to 2006/2007, and in mass on arrival for breeding of both
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ff662284074d731042cd968cdbab42a4
https://doi.org/10.2989/ajms.2008.30.1.19.469
https://doi.org/10.2989/ajms.2008.30.1.19.469
Publikováno v:
Emu - Austral Ornithology. 107:253-261
The population trend of Cape Cormorants (Phalacrocorax capensis), a species endemic to southern Africa and that feeds mainly on shoaling pelagic fish, is described for a 50-year period, from 1956–57 to 2006–07. The main breeding localities for th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::76fba2b0cf98afe689d90bb4c1894549
https://doi.org/10.1071/mu07015
https://doi.org/10.1071/mu07015
Publikováno v:
ICES Journal of Marine Science. 64:570-576
Crawford, R. J. M., Underhill, L. G., Upfold, L., and Dyer, B. M. 2007. An altered carrying capacity of the Benguela upwelling ecosystem for African penguins (Spheniscus demersus). – ICES Journal of Marine Science, 64: 570–576. The carrying capac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b399b795bc7e43c9ff1889d18b09bba
https://doi.org/10.1093/icesjms/fsm009
https://doi.org/10.1093/icesjms/fsm009
Autor:
Robert J. M. Crawford, Michael A. Meÿer, Norbert T. W. Klages, Benedict L. Dundee, B. M. Dyer, L Upfold
Publikováno v:
ICES Journal of Marine Science. 64:169-177
Crawford, R. J. M., Dundee, B. L., Dyer, B. M., Klages, N. T., Meÿer, M. A., and Upfold, L. 2007. Trends in numbers of Cape gannets (Morus capensis), 1956/57–2005/06, with a consideration of the influence of food and other factors – ICES Journal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f2362b890c6ba7efd5af8755d800b95a
https://doi.org/10.1093/icesjms/fsl011
https://doi.org/10.1093/icesjms/fsl011
Autor:
M Ruthenberg, Rjm Crawford, Les G. Underhill, L Upfold, T. M. Leshoro, B. M. Dyer, J Visagie, PA Whittington, A. C. Wolfaardt
Publikováno v:
African Journal of Marine Science. 28:697-704
From 1987 to 2005, numbers of African penguins Spheniscus demersus breeding in South Africa's Western Cape Province increased by about 50%. Numbers decreased at the four northernmost colonies in the region: Lambert's Bay and the three colonies in Sal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10c10cf47562a4ebf4b689b34b7f17fa
https://doi.org/10.2989/18142320609504218
https://doi.org/10.2989/18142320609504218