Time Allocation and Foraging Pattern of Chick-Rearing Razorbills in Northwest Iceland
Abstract A newly modified, bird-borne data-logger was used to investigate the flight activity and diving behavior of foraging Razorbills (Alca torda) breeding at Latrabjarg, northwest Iceland. The recorders allowed us to determine with high time-resolution all relevant movements in 47 complete forag...
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croxfordunivpr:10.1093/condor/103.3.469 2024-04-28T07:53:46+00:00 Time Allocation and Foraging Pattern of Chick-Rearing Razorbills in Northwest Iceland Dall'Antonia, Luigi Gudmundsson, Gudmundur A. Benvenuti, Silvano 2001 http://dx.doi.org/10.1093/condor/103.3.469 http://academic.oup.com/condor/article-pdf/103/3/469/29711942/condor0469.pdf en eng Oxford University Press (OUP) The Condor volume 103, issue 3, page 469-480 ISSN 0010-5422 1938-5129 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2001 croxfordunivpr https://doi.org/10.1093/condor/103.3.469 2024-04-02T08:05:51Z Abstract A newly modified, bird-borne data-logger was used to investigate the flight activity and diving behavior of foraging Razorbills (Alca torda) breeding at Latrabjarg, northwest Iceland. The recorders allowed us to determine with high time-resolution all relevant movements in 47 complete foraging trips of 29 different Razorbills during two successive breeding seasons, 1997 and 1998. In 1998, direction recorders equipped with a compass recorded 19 foraging routes of 10 different Razorbills. The trips consisted of a number of flights interrupted by short series of diving bouts by which the birds seemingly explored areas for prey availability. Foraging occurred at sites where Razorbills stopped, dived, and rested for a long time before returning to the nest by a single flight or a sequence of a few flights. The majority of dive profiles (n = 17 095 dives) consisted of nonstop downward and upward movements to depths rarely greater than 35 m, and never exceeding 41 m. There was considerable diurnal variation in foraging behavior, expressed by more frequent and shallower dives around midnight. The Razorbill's diving pattern turns out to be very different from that reported for Thick-billed Murres (Uria lomvia) breeding in the same colony. Considerable differences in duration of trips, average number of dives, and time allocation were observed between the two breeding seasons, suggesting differences in foraging conditions for the birds. Asignación de Tiempo y Patrones de Forrajeo durante la Crianza de los Pichones en Alca torda en el Noroeste de Islandia Resumen. Un archivador de datos recientemente modificado que se acopla a las aves fue utilizado para investigar la actividad de vuelo y el comportamiento de buceo de individuos reproductivos de Alca torda en Latrabjarg, noroeste de Islandia. Los equipos nos permitieron determinar con una alta resolución de tiempo todos los movimientos relevantes en 47 viajes de forrajeo de 29 individuos diferentes durante dos temporadas reproductivas sucesivas (1997 y 1998). En ... Article in Journal/Newspaper Alca torda Iceland Islandia Uria lomvia uria Oxford University Press The Condor 103 3 469 480 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Dall'Antonia, Luigi Gudmundsson, Gudmundur A. Benvenuti, Silvano Time Allocation and Foraging Pattern of Chick-Rearing Razorbills in Northwest Iceland |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract A newly modified, bird-borne data-logger was used to investigate the flight activity and diving behavior of foraging Razorbills (Alca torda) breeding at Latrabjarg, northwest Iceland. The recorders allowed us to determine with high time-resolution all relevant movements in 47 complete foraging trips of 29 different Razorbills during two successive breeding seasons, 1997 and 1998. In 1998, direction recorders equipped with a compass recorded 19 foraging routes of 10 different Razorbills. The trips consisted of a number of flights interrupted by short series of diving bouts by which the birds seemingly explored areas for prey availability. Foraging occurred at sites where Razorbills stopped, dived, and rested for a long time before returning to the nest by a single flight or a sequence of a few flights. The majority of dive profiles (n = 17 095 dives) consisted of nonstop downward and upward movements to depths rarely greater than 35 m, and never exceeding 41 m. There was considerable diurnal variation in foraging behavior, expressed by more frequent and shallower dives around midnight. The Razorbill's diving pattern turns out to be very different from that reported for Thick-billed Murres (Uria lomvia) breeding in the same colony. Considerable differences in duration of trips, average number of dives, and time allocation were observed between the two breeding seasons, suggesting differences in foraging conditions for the birds. Asignación de Tiempo y Patrones de Forrajeo durante la Crianza de los Pichones en Alca torda en el Noroeste de Islandia Resumen. Un archivador de datos recientemente modificado que se acopla a las aves fue utilizado para investigar la actividad de vuelo y el comportamiento de buceo de individuos reproductivos de Alca torda en Latrabjarg, noroeste de Islandia. Los equipos nos permitieron determinar con una alta resolución de tiempo todos los movimientos relevantes en 47 viajes de forrajeo de 29 individuos diferentes durante dos temporadas reproductivas sucesivas (1997 y 1998). En ... |
format |
Article in Journal/Newspaper |
author |
Dall'Antonia, Luigi Gudmundsson, Gudmundur A. Benvenuti, Silvano |
author_facet |
Dall'Antonia, Luigi Gudmundsson, Gudmundur A. Benvenuti, Silvano |
author_sort |
Dall'Antonia, Luigi |
title |
Time Allocation and Foraging Pattern of Chick-Rearing Razorbills in Northwest Iceland |
title_short |
Time Allocation and Foraging Pattern of Chick-Rearing Razorbills in Northwest Iceland |
title_full |
Time Allocation and Foraging Pattern of Chick-Rearing Razorbills in Northwest Iceland |
title_fullStr |
Time Allocation and Foraging Pattern of Chick-Rearing Razorbills in Northwest Iceland |
title_full_unstemmed |
Time Allocation and Foraging Pattern of Chick-Rearing Razorbills in Northwest Iceland |
title_sort |
time allocation and foraging pattern of chick-rearing razorbills in northwest iceland |
publisher |
Oxford University Press (OUP) |
publishDate |
2001 |
url |
http://dx.doi.org/10.1093/condor/103.3.469 http://academic.oup.com/condor/article-pdf/103/3/469/29711942/condor0469.pdf |
genre |
Alca torda Iceland Islandia Uria lomvia uria |
genre_facet |
Alca torda Iceland Islandia Uria lomvia uria |
op_source |
The Condor volume 103, issue 3, page 469-480 ISSN 0010-5422 1938-5129 |
op_doi |
https://doi.org/10.1093/condor/103.3.469 |
container_title |
The Condor |
container_volume |
103 |
container_issue |
3 |
container_start_page |
469 |
op_container_end_page |
480 |
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1797573231673081856 |