Nest-site selection by roseate terns breeding on aride island, Seychelles

Detalhes bibliográficos
Autor(a) principal: Ramos, Jaime
Data de Publicação: 1998
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10198/7991
Resumo: Nest-site selection by tropical Roseate Terns (Sterna dougallii) was examined on Aride Island, Seychelles. Continuous variables reflecting concealment of the nest site, shelter, vegetation cover and intraspecific nest density were measured for nest-sites and random points. Seasonal variation in the initiation of nests with overhangs and their influence on hatching success and adult intraspecific aggression towards chicks were also examined. Roseate Terns selected nest-sites closer to taller vertical objects, and with a higher percentage of rocks, logs or branches overhanging the nest than occurred at random points. Nest-sites in small colonies differed more from the available habitat than did those in the main colony. Nesting density was positively correlated with the amount of rock cover. On Aride and other colonies in the tropics Roseate Terns breed at higher densities than their temperate counter-parts and spacing between neighbors may be a main factor in the selection of nest-sites, especially for birds nesting at the peak of the breeding season. Nest-site characteristics, notably overhangs, had no influence on hatching success. However, the proportion of chicks that died from adult pecking was significantly lower in nests with overhangs. Concealment is a main factor of Roseate Tern nest-site selection throughout its breeding range, in both tropical and temperate areas, but the factors selecting for concealment seem to vary amongst colonies. On Aride concealment appeared to be advantageous in defending territories and protecting young chicks from attacks of adults. Artificial overhangs could be provided to enhance chick survival.
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spelling Nest-site selection by roseate terns breeding on aride island, SeychellesNest-site selectionNesting densityRoseate ternSeychellesSterna dougalliiTropical ternsNest-site selection by tropical Roseate Terns (Sterna dougallii) was examined on Aride Island, Seychelles. Continuous variables reflecting concealment of the nest site, shelter, vegetation cover and intraspecific nest density were measured for nest-sites and random points. Seasonal variation in the initiation of nests with overhangs and their influence on hatching success and adult intraspecific aggression towards chicks were also examined. Roseate Terns selected nest-sites closer to taller vertical objects, and with a higher percentage of rocks, logs or branches overhanging the nest than occurred at random points. Nest-sites in small colonies differed more from the available habitat than did those in the main colony. Nesting density was positively correlated with the amount of rock cover. On Aride and other colonies in the tropics Roseate Terns breed at higher densities than their temperate counter-parts and spacing between neighbors may be a main factor in the selection of nest-sites, especially for birds nesting at the peak of the breeding season. Nest-site characteristics, notably overhangs, had no influence on hatching success. However, the proportion of chicks that died from adult pecking was significantly lower in nests with overhangs. Concealment is a main factor of Roseate Tern nest-site selection throughout its breeding range, in both tropical and temperate areas, but the factors selecting for concealment seem to vary amongst colonies. On Aride concealment appeared to be advantageous in defending territories and protecting young chicks from attacks of adults. Artificial overhangs could be provided to enhance chick survival.Biblioteca Digital do IPBRamos, Jaime2013-01-21T12:06:46Z19981998-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10198/7991engRamos, Jaime (1998). Nest-site selection by roseate terns breeding on aride island, Seychelles. Waterbirds. ISSN 0738-6028. 21:3, p. 438-44310.2307/1521658info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-21T10:19:32Zoai:bibliotecadigital.ipb.pt:10198/7991Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:59:35.536155Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Nest-site selection by roseate terns breeding on aride island, Seychelles
title Nest-site selection by roseate terns breeding on aride island, Seychelles
spellingShingle Nest-site selection by roseate terns breeding on aride island, Seychelles
Ramos, Jaime
Nest-site selection
Nesting density
Roseate tern
Seychelles
Sterna dougallii
Tropical terns
title_short Nest-site selection by roseate terns breeding on aride island, Seychelles
title_full Nest-site selection by roseate terns breeding on aride island, Seychelles
title_fullStr Nest-site selection by roseate terns breeding on aride island, Seychelles
title_full_unstemmed Nest-site selection by roseate terns breeding on aride island, Seychelles
title_sort Nest-site selection by roseate terns breeding on aride island, Seychelles
author Ramos, Jaime
author_facet Ramos, Jaime
author_role author
dc.contributor.none.fl_str_mv Biblioteca Digital do IPB
dc.contributor.author.fl_str_mv Ramos, Jaime
dc.subject.por.fl_str_mv Nest-site selection
Nesting density
Roseate tern
Seychelles
Sterna dougallii
Tropical terns
topic Nest-site selection
Nesting density
Roseate tern
Seychelles
Sterna dougallii
Tropical terns
description Nest-site selection by tropical Roseate Terns (Sterna dougallii) was examined on Aride Island, Seychelles. Continuous variables reflecting concealment of the nest site, shelter, vegetation cover and intraspecific nest density were measured for nest-sites and random points. Seasonal variation in the initiation of nests with overhangs and their influence on hatching success and adult intraspecific aggression towards chicks were also examined. Roseate Terns selected nest-sites closer to taller vertical objects, and with a higher percentage of rocks, logs or branches overhanging the nest than occurred at random points. Nest-sites in small colonies differed more from the available habitat than did those in the main colony. Nesting density was positively correlated with the amount of rock cover. On Aride and other colonies in the tropics Roseate Terns breed at higher densities than their temperate counter-parts and spacing between neighbors may be a main factor in the selection of nest-sites, especially for birds nesting at the peak of the breeding season. Nest-site characteristics, notably overhangs, had no influence on hatching success. However, the proportion of chicks that died from adult pecking was significantly lower in nests with overhangs. Concealment is a main factor of Roseate Tern nest-site selection throughout its breeding range, in both tropical and temperate areas, but the factors selecting for concealment seem to vary amongst colonies. On Aride concealment appeared to be advantageous in defending territories and protecting young chicks from attacks of adults. Artificial overhangs could be provided to enhance chick survival.
publishDate 1998
dc.date.none.fl_str_mv 1998
1998-01-01T00:00:00Z
2013-01-21T12:06:46Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10198/7991
url http://hdl.handle.net/10198/7991
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Ramos, Jaime (1998). Nest-site selection by roseate terns breeding on aride island, Seychelles. Waterbirds. ISSN 0738-6028. 21:3, p. 438-443
10.2307/1521658
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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