| Titre : | Ostrich 86(1-2) - May 2015 |
| Type de document : | Bulletin |
| Paru le : | 01/05/2015 |
Dépouillements
Article
John Y. Takekawa, Auteur ;
Shane R. Heath, Auteur ;
Samuel A. Iverson, Auteur ;
Nicolas Gaidet, Auteur ;
Julien Cappelle, Auteur ;
Tim Dodman, Auteur ;
Ward Hagemeijer, Auteur ;
William D. Eldridge, Auteur ;
Scott A. Petrie, Auteur ;
Gregory S. Yarris, Auteur ;
Shiiwua Manu, Auteur ;
Glenn H. Olsen, Auteur ;
Diann J. Prosser, Auteur ;
Kyle A. Spragens, Auteur ;
David C. Douglas, Auteur ;
Scott H. Newman, Auteur
Habitat availability for Afrotropical waterbirds is highly dynamic with unpredictable rainfall patterns and ephemeral wetlands resulting in diverse movement strategies among different species. Movement strategies among waterfowl encompass reside[...]
Article
Emily K Edwards, Auteur ;
Nicola J Mitchell, Auteur ;
Amanda R Ridley, Auteur
High temperatures can pose significant thermoregulation challenges for endotherms, and determining how individual species respond to high temperatures will be important for predicting the impact of global warming on wild populations. Animals can[...]
Article
Ian T Little, Auteur ;
Philip AR Hockey, Auteur ;
Raymond Jansen, Auteur
By focusing on process-oriented data rather than inventory-type data, this study provides a robust understanding of the effects of agricultural management on grassland bird reproductive output in the moist highland grasslands (MHGs) of South Afr[...]
Article
Blair A Zoghby, Auteur ;
Peter G Ryan, Auteur ;
Rob M Little, Auteur ;
Tim Reid, Auteur ;
Philip AR Hockey, Auteur
Southern Ground-Hornbills Bucorvus leadbeateri are Endangered in South Africa and there is a concerted effort to reverse their population decline. They live in groups year round, with only the alpha pair breeding, raising at most one chick per y[...]
Article
Rowan O Martin, Auteur ;
Susan J Cunningham, Auteur ;
Philip AR Hockey, Auteur
Many animals use thermally buffered microhabitats, e.g. patches of shade within trees, to avoid temperature extremes. These ‘thermal refugia’ may mediate the impact of climate change on animals. Predicting how species and communities will respon[...]
Article
Shirley Van de Voorde, Auteur ;
Minke Witteveen, Auteur ;
Mark Brown, Auteur
Many ground-nesting shorebirds experience a high level of anthropogenic disturbance, often to the detriment of their breeding success. This study investigated the responses of the Near-Threatened African Black Oystercatcher Haematopus moquini (A[...]
Article
Susan J Cunningham, Auteur ;
Rowan O Martin, Auteur ;
Philip AR Hockey, Auteur
Behavioural thermoregulation, particularly the use of cool microclimates, is one method by which organisms could avoid the worst effects of climate warming. However, retreat into cool microsites, e.g. shady vegetation or burrows, may carry impor[...]
Article
Douglas Loewenthal, Auteur ;
Dane M Paijmans, Auteur ;
Philip AR Hockey, Auteur
Adult African Black Oystercatchers Haematopus moquini are sedentary and territorial year round, with juveniles expressing strong natal philopatry. At four South African study sites (two mainland and two islands) breeding numbers more than double[...]
Article
Ralf HE Mullers, Auteur ;
Arjun Amar, Auteur
Shoebills (Balaeniceps rex) are endemic to large, well-vegetated wetlands in central-eastern Africa. Populations are believed to be declining throughout their range and knowledge about their ecology, behaviour and distribution is vital for their[...]
Article
Douglas Loewenthal, Auteur ;
Dane M Paijmans, Auteur ;
Philip W Haupt, Auteur ;
Philip AR Hockey, Auteur
The African Black Oystercatcher Haematopus moquini is classified as Near Threatened because the population size is small (
Article
Tom P Flower, Auteur ;
Benjamin J Ashton, Auteur ;
Elisabet Zöttl, Auteur ;
Ryan M Olinger, Auteur ;
Philip AR Hockey, Auteur
Different species of brood parasitic birds, which lay their eggs in the nests of host foster-parents, rarely target the same host species population. We report brood parasitism of Fork-tailed Drongos Dicrurus adsimilis in the southern Kalahari D[...]
Article
Giuseppe De Marchi, Auteur ;
Giorgio Chiozzi, Auteur ;
Dawit Semere, Auteur ;
Yohannes Mebrahtu, Auteur ;
Farhad Hosseini Tayefeh, Auteur ;
Mohammed Almalki, Auteur ;
Mauro Fasola, Auteur
The timing of breeding in birds is a life-history trait that generally depends on food availability, but other factors may play a role, particularly in tropical areas where food availability is less seasonal than in temperate or polar areas. We [...]
Article
Philip A Whittington, Auteur ;
Anthony J Tree, Auteur ;
Maëlle Connan, Auteur ;
Elizabeth G Watkins, Auteur
The Eastern Cape population of the Damara Tern Sternula balaenarum was estimated to be 25–29 pairs in the 2008/09 and 2009/10 breeding seasons. The population appears to be stable and has probably increased slightly since the early 1990s. An eas[...]
Article
Dane M Paijmans, Auteur ;
Douglas Loewenthal, Auteur ;
Peter G Ryan, Auteur ;
Philip AR Hockey, Auteur
African Black Oystercatchers Haematopus moquini produce a modal clutch size of two eggs and only rarely lay three eggs. A review of over 4 000 nest records from across their breeding range (dating back to the early 1960s) revealed that three-egg[...]
Article
Douglas Loewenthal, Auteur ;
Dane M Paijmans, Auteur ;
Philip AR Hockey, Auteur
Theoretical and empirical studies of oystercatchers both suggest that levels of adult site fidelity, natal philopatry and age-at-first-breeding are interrelated consequences of life-history decisions made by potential breeders. All are fundament[...]
Article
Peter G Ryan, Auteur ;
Ben J Dilley, Auteur ;
Christopher Jones, Auteur ;
Alexander L Bond, Auteur
The Blue Petrel Halobaena caerulea breeds at five subantarctic island groups and at islands off southern Chile in a narrow latitudinal band from 47° to 56° S on either side of the Antarctic Polar Front. We found a colony on Gough Island (40° S, [...]
Article
Alan TK Lee, Auteur ;
Phoebe Barnard, Auteur ;
Philip AR Hockey, Auteur
Estimates of bird numbers through quantification of density and range sizes are necessary for decisions regarding conservation status, yet counts of birds are often confounded by uncertainty of detection. The status of the endemic birds of the F[...]
Article
John Y Takekawa, Auteur ;
Shane R Heath, Auteur ;
Samuel A Iverson, Auteur ;
Nicolas Gaidet, Auteur ;
Julien Cappelle, Auteur ;
Tim Dodman, Auteur ;
Ward Hagemeijer, Auteur ;
William D Eldridge, Auteur ;
Scott A Petrie, Auteur ;
Gregory S Yarris, Auteur ;
Shiiwua Manu, Auteur ;
Glenn H Olsen, Auteur ;
Diann J Prosser, Auteur ;
Kyle A Spragens, Auteur ;
David C Douglas, Auteur ;
Scott H Newman, Auteur
Habitat availability for Afrotropical waterbirds is highly dynamic with unpredictable rainfall patterns and ephemeral wetlands resulting in diverse movement strategies among different species. Movement strategies among waterfowl encompass reside[...]
Article
W Richard J Dean, Auteur ;
Suzanne J Milton, Auteur ;
Hugh P Forsyth, Auteur ;
Dorrien R Tissiman, Auteur
Regular twice-monthly counts of birds associated with water at the Prince Albert sewage disposal facility recorded 69 species, of which 16 species (23.5%) were waterbirds (ducks, Red-knobbed Coot Fulica cristata and Little Grebe Tachybaptus rufi[...]
Article
Hannah L Thomas, Auteur ;
Philip AR Hockey, Auteur ;
Graeme S Cumming, Auteur
Highly mobile species are difficult to monitor. It is often unclear from abundance estimates whether a population is genuinely declining or simply elsewhere. If the spatial and temporal scales of monitoring are inadequate, the data will only be [...]
Article
Rob M. Little, Auteur
Article
Kate J. H. England, Auteur ;
Colin Jackson, Auteur ;
Philip A. R. Hockey, Auteur
A methodology for rapidly assessing the vulnerability of waterbirds to disturbance was tested at Sabaki estuary, Kenya. Three variables were employed to measure the responses of 15 species: (1) bird density, (2) minimum distance of birds from a [...]
