Histological basis of age-related changes in iris color in the African Pied Starling (Spreo bicolor)
- Sweijd, Neville, Craig, Adrian J F K
- Authors: Sweijd, Neville , Craig, Adrian J F K
- Date: 1991
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/465393 , vital:76600 , http://www.jstor.org/stable/4088047
- Description: Juvenile African Pied Starlings (Spreo bicolor) have a dark brown iris, but after the first year iris color changes progressively until adult birds have a creamy-white iris. Using light and electron microscopy, we found that the pigment epithelium of the iris remains pigmented, while changes occur in the pigmentation of the anterior border layer and the stroma of the subadult and adult iris. In the juvenile iris the anterior border layer is darkly pigmented, but in the subadult iris this pigmentation is lost progressively, while pigment granules are deposited in the stroma. In adults, the stroma is heavily pigmented with a solid refractory pigment, and the anterior border layer is clear.
- Full Text:
- Date Issued: 1991
Histological basis of age-related changes in iris color in the African Pied Starling (Spreo bicolor)
- Authors: Sweijd, Neville , Craig, Adrian J F K
- Date: 1991
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/465393 , vital:76600 , http://www.jstor.org/stable/4088047
- Description: Juvenile African Pied Starlings (Spreo bicolor) have a dark brown iris, but after the first year iris color changes progressively until adult birds have a creamy-white iris. Using light and electron microscopy, we found that the pigment epithelium of the iris remains pigmented, while changes occur in the pigmentation of the anterior border layer and the stroma of the subadult and adult iris. In the juvenile iris the anterior border layer is darkly pigmented, but in the subadult iris this pigmentation is lost progressively, while pigment granules are deposited in the stroma. In adults, the stroma is heavily pigmented with a solid refractory pigment, and the anterior border layer is clear.
- Full Text:
- Date Issued: 1991
The Behaviour Of Palewinged Starlings And A Comparison With Other Onychognathvs Species
- Craig, Adrian J F K, Hulley, Patrick E, Walter, Grenville H
- Authors: Craig, Adrian J F K , Hulley, Patrick E , Walter, Grenville H
- Date: 1991
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447868 , vital:74680 , https://doi.org/10.1080/00306525.1991.9639648
- Description: Pairs of Palewinged Starlings associate throughout the year and roost at the nest sites. Flock sizes are generally small, even during the non-breeding season. Allofeeding and allopreening have not been recorded. Wing displays emphasize the white region of the primaries. The territory appears to be restricted to the nest site. Interspecific aggression occurred between Redwinged and Palewinged Starlings, and was also directed at other Ed species frequenting the cliff. A form of ceremonial gathering occurs re in Palewinged Starlings. A review of the literature suggests that on behavioural grounds the Palewinged Starling shows no close affinity to the Redwinged Starfng or to any other member of the genus.
- Full Text:
- Date Issued: 1991
- Authors: Craig, Adrian J F K , Hulley, Patrick E , Walter, Grenville H
- Date: 1991
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447868 , vital:74680 , https://doi.org/10.1080/00306525.1991.9639648
- Description: Pairs of Palewinged Starlings associate throughout the year and roost at the nest sites. Flock sizes are generally small, even during the non-breeding season. Allofeeding and allopreening have not been recorded. Wing displays emphasize the white region of the primaries. The territory appears to be restricted to the nest site. Interspecific aggression occurred between Redwinged and Palewinged Starlings, and was also directed at other Ed species frequenting the cliff. A form of ceremonial gathering occurs re in Palewinged Starlings. A review of the literature suggests that on behavioural grounds the Palewinged Starling shows no close affinity to the Redwinged Starfng or to any other member of the genus.
- Full Text:
- Date Issued: 1991
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