Habitat use and foraging success of Roseate and Common Terns feeding in flocks in the Azores
Aims: To study the foraging ecology of roseate terns and common terns in the Azores sub-tropical wa- ters where the former species is relatively abundant compared to congeners. In particular, we asked whether foraging behaviour differed between both species, which factors determined individual succe...
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ftunivcoimbra:oai:estudogeral.sib.uc.pt:10316/13079 2023-05-15T15:54:02+02:00 Habitat use and foraging success of Roseate and Common Terns feeding in flocks in the Azores Uso del hábitat y éxito en la búsqueda de alimento en bandos del charrán rosado y charrán común en Azores Monticelli, David Ramos, Jaime A. Pereira, José 2006 http://hdl.handle.net/10316/13079 eng eng Spanish Society of Ornithology Ardeola. 53:2 (2006) 293-306 0570-7358 http://hdl.handle.net/10316/13079 info:eu-repo/semantics/openAccess Roseate tern Common tern Foraging success Predatory fish Foraging competition Seabird conservation Azores Sterna dougallii Sterna hirundo Charrán rosado Charrán común Éxito de alimentación Depredadores de peces Competencia en la alimentación Conservación de aves marinas info:eu-repo/semantics/article 2006 ftunivcoimbra 2022-08-11T13:57:31Z Aims: To study the foraging ecology of roseate terns and common terns in the Azores sub-tropical wa- ters where the former species is relatively abundant compared to congeners. In particular, we asked whether foraging behaviour differed between both species, which factors determined individual success at forag- ing-flocks, and how did our findings compare with previous studies of Atlantic populations in North Amer- ica (temperate), and Caribbean (tropical). Location: Ponta das Contendas (38°39’N, 27°05’W), Terceira Island, Azores. Methods: Foraging-flocks were characterized and compared in terms of species (single- or mixed- species), size (no. of individuals), type of habitat (inshore, exposed coast, deep blue water), and presence- absence of biotic effects. We used a generalized linear model (GLM) approach to study the effect of se- lected factors (species, habitat, biotic effect, cloud cover, wind speed, and their interactions) on individual foraging parameters at these flocks (number of dives min-1, number of aborted dives min-1, number of prey caught min -1). Results: Both tern species were most often observed in mixed-flocks in the exposed coast habitat, but roseate terns were also prone to feed in mono-specific flocks over blue water. Only one quarter of the to- tal number of flocks recorded was in the presence of biotic effects, a situation where common terns, but not roseate terns, were twice more numerous. The GLM results suggested that species and habitat alone were good predictors of prey caught min-1: common terns achieved the highest success in inshore bays (1.2 fish min-1) while roseate terns maximized their success on exposed coasts (0.8 fish min-1). In the presence of biotic effects, both species dove at a higher frequency, and aborted fewer dives per min, but there was no marked effect on capture rates. Increasing wind speed negatively affected the rate at which both species aborted dives, but again, there was no effect on capture success. Conclusions: Foraging success did not increase in the ... Article in Journal/Newspaper Charrán común Common tern Sterna hirundo Universidade de Coimbra: Estudo Geral |
institution |
Open Polar |
collection |
Universidade de Coimbra: Estudo Geral |
op_collection_id |
ftunivcoimbra |
language |
English |
topic |
Roseate tern Common tern Foraging success Predatory fish Foraging competition Seabird conservation Azores Sterna dougallii Sterna hirundo Charrán rosado Charrán común Éxito de alimentación Depredadores de peces Competencia en la alimentación Conservación de aves marinas |
spellingShingle |
Roseate tern Common tern Foraging success Predatory fish Foraging competition Seabird conservation Azores Sterna dougallii Sterna hirundo Charrán rosado Charrán común Éxito de alimentación Depredadores de peces Competencia en la alimentación Conservación de aves marinas Monticelli, David Ramos, Jaime A. Pereira, José Habitat use and foraging success of Roseate and Common Terns feeding in flocks in the Azores |
topic_facet |
Roseate tern Common tern Foraging success Predatory fish Foraging competition Seabird conservation Azores Sterna dougallii Sterna hirundo Charrán rosado Charrán común Éxito de alimentación Depredadores de peces Competencia en la alimentación Conservación de aves marinas |
description |
Aims: To study the foraging ecology of roseate terns and common terns in the Azores sub-tropical wa- ters where the former species is relatively abundant compared to congeners. In particular, we asked whether foraging behaviour differed between both species, which factors determined individual success at forag- ing-flocks, and how did our findings compare with previous studies of Atlantic populations in North Amer- ica (temperate), and Caribbean (tropical). Location: Ponta das Contendas (38°39’N, 27°05’W), Terceira Island, Azores. Methods: Foraging-flocks were characterized and compared in terms of species (single- or mixed- species), size (no. of individuals), type of habitat (inshore, exposed coast, deep blue water), and presence- absence of biotic effects. We used a generalized linear model (GLM) approach to study the effect of se- lected factors (species, habitat, biotic effect, cloud cover, wind speed, and their interactions) on individual foraging parameters at these flocks (number of dives min-1, number of aborted dives min-1, number of prey caught min -1). Results: Both tern species were most often observed in mixed-flocks in the exposed coast habitat, but roseate terns were also prone to feed in mono-specific flocks over blue water. Only one quarter of the to- tal number of flocks recorded was in the presence of biotic effects, a situation where common terns, but not roseate terns, were twice more numerous. The GLM results suggested that species and habitat alone were good predictors of prey caught min-1: common terns achieved the highest success in inshore bays (1.2 fish min-1) while roseate terns maximized their success on exposed coasts (0.8 fish min-1). In the presence of biotic effects, both species dove at a higher frequency, and aborted fewer dives per min, but there was no marked effect on capture rates. Increasing wind speed negatively affected the rate at which both species aborted dives, but again, there was no effect on capture success. Conclusions: Foraging success did not increase in the ... |
format |
Article in Journal/Newspaper |
author |
Monticelli, David Ramos, Jaime A. Pereira, José |
author_facet |
Monticelli, David Ramos, Jaime A. Pereira, José |
author_sort |
Monticelli, David |
title |
Habitat use and foraging success of Roseate and Common Terns feeding in flocks in the Azores |
title_short |
Habitat use and foraging success of Roseate and Common Terns feeding in flocks in the Azores |
title_full |
Habitat use and foraging success of Roseate and Common Terns feeding in flocks in the Azores |
title_fullStr |
Habitat use and foraging success of Roseate and Common Terns feeding in flocks in the Azores |
title_full_unstemmed |
Habitat use and foraging success of Roseate and Common Terns feeding in flocks in the Azores |
title_sort |
habitat use and foraging success of roseate and common terns feeding in flocks in the azores |
publisher |
Spanish Society of Ornithology |
publishDate |
2006 |
url |
http://hdl.handle.net/10316/13079 |
genre |
Charrán común Common tern Sterna hirundo |
genre_facet |
Charrán común Common tern Sterna hirundo |
op_relation |
Ardeola. 53:2 (2006) 293-306 0570-7358 http://hdl.handle.net/10316/13079 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766389206432612352 |