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Documents disponibles écrits par cet auteur (11)
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Article
Peter G Ryan, Auteur ; Cliff Dorse, Auteur ; Dave Gilroy, Auteur ; James Hogg, Auteur ; Albert McLean, Auteur ; Christine Read, Auteur ; Evan Trotzuk, Auteur ; Gary Allport, AuteurWe report the numbers of coastal birds in the Greater Bazaruto Important Bird and Biodiversity Area (IBA), Mozambique. In November–December 2023, we counted waterbirds foraging on tidal flats and at roost sites in the San Sebastian (São Sebastiã[...]
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Rachel Dobson, Auteur ; Jessica M Shaw, Auteur ; Robin Colyn, Auteur ; Peter G Ryan, AuteurNomadism is characterised by irregular movement patterns that vary within and among years, as individuals respond to dynamic environmental conditions across space and time. Nomadic bird movements are poorly understood because their high variabil[...]
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Michael Brooks, Auteur ; Sanjo Rose, Auteur ; Res Altwegg, Auteur ; Alan TK Lee, Auteur ; Henk Nel, Auteur ; Ulf Ottosson, Auteur ; Ernst Retief, Auteur ; Chevonne Reynolds, Auteur ; Peter G Ryan, Auteur ; Sidney Shema, Auteur ; Talatu Tende, Auteur ; Les G Underhill, Auteur ; Robert L Thomson, AuteurThe African Bird Atlas Project (ABAP) is a citizen-science bird-monitoring programme that relies on a robust, repeatable protocol (BirdMap) and allows insights into the distributions of African birds and their conservation. The protocol involves[...]
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Maëlle Connan, Auteur ; Stefan Schoombie, Auteur ; Janine Schoombie, Auteur ; Ben Dilley, Auteur ; Peter G Ryan, AuteurNocturnal burrow-nesting seabirds are notoriously difficult to study and can go unnoticed for years in remote areas. One of these species is the Common Diving Petrel Pelecanoides urinatrix, which has a circumpolar breeding distribution in the So[...]
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Oluwadunsin E Adekola, Auteur ; Robert JM Crawford, Auteur ; Bruce M Dyer, Auteur ; Azwianewi B Makhado, Auteur ; Leshia Upfold, Auteur ; Peter G Ryan, AuteurLittle 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 sequence of flight feather moult in Cape Gannets f[...]
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Peter G Ryan, Auteur ; E Molly Ryan, Auteur ; James P Glass, AuteurMost of the millions of burrow-nesting petrels that breed at Tristan da Cunha are susceptible to light pollution. On dark, misty nights, petrels become disoriented by artificial lights, mainly from ships. From 2013 to 2021 at least 1 823 petrels[...]
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Alexis Osborne, Auteur ; Peter G Ryan, AuteurScoring moult from live birds in the hand takes time, thereby increasing the handling stress to the birds. We show that digital photography can be used to efficiently study moult extent across multiple feather tracts. We photographed the upper w[...]
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Peter G Ryan, Auteur ; Ben J Dilley, Auteur ; Christopher Jones, Auteur ; Alexander L Bond, AuteurThe 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, [...]
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Blair A Zoghby, Auteur ; Peter G Ryan, Auteur ; Rob M Little, Auteur ; Tim Reid, Auteur ; Philip AR Hockey, AuteurSouthern 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[...]
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Dane M Paijmans, Auteur ; Douglas Loewenthal, Auteur ; Peter G Ryan, Auteur ; Philip AR Hockey, AuteurAfrican 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[...]
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Blair A Zoghby, Auteur ; Rob M Little, Auteur ; Peter G Ryan, Auteur ; Philip AR Hockey, AuteurDifferent habitats may be used for the needs of various aspects of an animal’s life. Southern Ground-Hornbill Bucorvus leadbeateri groups announce their presence within year-round territories by calling at dawn from their overnight roost sites. [...]
