A consequence of nectar feeding?
- Craig, Adrian J F K, Hulley, Patrick E
- Authors: Craig, Adrian J F K , Hulley, Patrick E
- Date: 1996
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/465245 , vital:76586 , https://sora.unm.edu/node/52068
- Description: Cape White-eyes (Zosterops pallidus) frequently feed on nectar during early winter. This feeding can leave feathers on the forehead matted with nectar and pollen. At least some individuals then shed these feathers, at a time when the annual complete molt has already been terminated. It is suggested that such localized replacement of fouled plumage may occur regularly both in white-eyes and in other short-billed nectar-feeder.
- Full Text:
- Date Issued: 1996
- Authors: Craig, Adrian J F K , Hulley, Patrick E
- Date: 1996
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/465245 , vital:76586 , https://sora.unm.edu/node/52068
- Description: Cape White-eyes (Zosterops pallidus) frequently feed on nectar during early winter. This feeding can leave feathers on the forehead matted with nectar and pollen. At least some individuals then shed these feathers, at a time when the annual complete molt has already been terminated. It is suggested that such localized replacement of fouled plumage may occur regularly both in white-eyes and in other short-billed nectar-feeder.
- Full Text:
- Date Issued: 1996
Comparisons of the vocalizations and social behaviour of southern African Pycnonotus bulbuls
- Lloyd, Penn, Hulley, Patrick E, Craig, Adrian J F K
- Authors: Lloyd, Penn , Hulley, Patrick E , Craig, Adrian J F K
- Date: 1996
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447774 , vital:74673 , https://doi.org/10.1080/00306525.1996.9639696
- Description: Vocalizations and associated behaviour of three Pycnonotus species are described, based on field observations and tape recordings from which sonagrams were produced. These species, which are locally sym-patric and hybridize, have similar vocalizations and displays; differences are most apparent in their contact calls and songs. Quantitative analysis of the songs showed that P. barbatus and P. capensis are easily distinguished, whereas the song characteristics of P. nigricans overlap those of both the other species. Playback experiments with territorial male P. barbatus in an area of allopatry showed similar responses to songs of conspecifics and of P. nigricans, but almost no response to the song of P. capensis.
- Full Text:
- Date Issued: 1996
- Authors: Lloyd, Penn , Hulley, Patrick E , Craig, Adrian J F K
- Date: 1996
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447774 , vital:74673 , https://doi.org/10.1080/00306525.1996.9639696
- Description: Vocalizations and associated behaviour of three Pycnonotus species are described, based on field observations and tape recordings from which sonagrams were produced. These species, which are locally sym-patric and hybridize, have similar vocalizations and displays; differences are most apparent in their contact calls and songs. Quantitative analysis of the songs showed that P. barbatus and P. capensis are easily distinguished, whereas the song characteristics of P. nigricans overlap those of both the other species. Playback experiments with territorial male P. barbatus in an area of allopatry showed similar responses to songs of conspecifics and of P. nigricans, but almost no response to the song of P. capensis.
- Full Text:
- Date Issued: 1996
Seed dispersal in an African fig tree: birds as high quantity, low quality dispersers?
- Compton, Stephen G, Craig, Adrian J F K, Waters, I W R
- Authors: Compton, Stephen G , Craig, Adrian J F K , Waters, I W R
- Date: 1996
- Subjects: To be catalogued
- Language: English
- Type: article
- Identifier: http://hdl.handle.net/10962/465445 , vital:76610 , https://doi.org/10.1111/j.1365-2699.1996.tb00017.x
- Description: Ficus burtt‐davyi is a shrub or small tree found in the south and east of South Africa. Based on studies carried out in an area where the plant grows mainly as a rock‐splitter, we first describe the nature and timing of the fruit resources it offers to potential dispersal agents, and then the animals that feed on the fruits. The figs are eaten by a diverse avian disperser assemblage, although just two species comprised about half of the recorded visits to the trees. Germination trials with seeds defecated by the birds found that they germinated more quickly than control seeds. Small terrestrial mammals and ants were also found to have a role in fig seed dispersal which may be disproportionate to the number of seeds they transport.
- Full Text:
- Date Issued: 1996
- Authors: Compton, Stephen G , Craig, Adrian J F K , Waters, I W R
- Date: 1996
- Subjects: To be catalogued
- Language: English
- Type: article
- Identifier: http://hdl.handle.net/10962/465445 , vital:76610 , https://doi.org/10.1111/j.1365-2699.1996.tb00017.x
- Description: Ficus burtt‐davyi is a shrub or small tree found in the south and east of South Africa. Based on studies carried out in an area where the plant grows mainly as a rock‐splitter, we first describe the nature and timing of the fruit resources it offers to potential dispersal agents, and then the animals that feed on the fruits. The figs are eaten by a diverse avian disperser assemblage, although just two species comprised about half of the recorded visits to the trees. Germination trials with seeds defecated by the birds found that they germinated more quickly than control seeds. Small terrestrial mammals and ants were also found to have a role in fig seed dispersal which may be disproportionate to the number of seeds they transport.
- Full Text:
- Date Issued: 1996
The annual cycle of wing‐moult and breeding in the Wattled Starling Creatophora cinerea
- Authors: Craig, Adrian J F K
- Date: 1996
- Subjects: To be catalogued
- Language: English
- Type: article
- Identifier: http://hdl.handle.net/10962/465496 , vital:76614 , https://doi.org/10.1111/j.1474-919X.1996.tb08063.x
- Description: Moult, breeding and seasonal occurrence of the Wattled Starling Creatophora cinerea throughout its range in Africa are reviewed based on data from museum specimens and the published literature. Neither moult nor breeding follows a rigid seasonal pattern, although there are some regional differences, and overlap between moult and breeding is unlikely. The regular occurrence of interrupted wing‐moult may be associated with nomadic movements rather than opportunistic breeding.
- Full Text:
- Date Issued: 1996
- Authors: Craig, Adrian J F K
- Date: 1996
- Subjects: To be catalogued
- Language: English
- Type: article
- Identifier: http://hdl.handle.net/10962/465496 , vital:76614 , https://doi.org/10.1111/j.1474-919X.1996.tb08063.x
- Description: Moult, breeding and seasonal occurrence of the Wattled Starling Creatophora cinerea throughout its range in Africa are reviewed based on data from museum specimens and the published literature. Neither moult nor breeding follows a rigid seasonal pattern, although there are some regional differences, and overlap between moult and breeding is unlikely. The regular occurrence of interrupted wing‐moult may be associated with nomadic movements rather than opportunistic breeding.
- Full Text:
- Date Issued: 1996
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