Foraging patterns of breeding Olrog's Gull at Golfo San Jorge, Argentina

The spatial distribution and use of feeding areas by Olrog's Gull (Larus atlanticus) breeding within a 34 km2 inlet at Golfo San Jorge, Argentina was investigated. Radio-transmitters were deployed on eight breeding adult birds during the late incubation period in 2001. Feeding areas were identi...

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Detalles Bibliográficos
Autores principales: Yorio, P., Quintana, F., Gatto, A., Lisnizer, N., Suárez, N.
Formato: JOUR
Materias:
Argentina
Foraging patterns
Larus atlanticus
Olrog's Gull
Patagonia
foraging behavior
radiotelemetry
seabird
spatial distribution
Atlantic Ocean
Golfo San Jorge
Atlanticus
Aves
Decapoda (Crustacea)
Larus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15244695_v27_n2_p193_Yorio
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15244695_v27_n2_p193_Yorio
record_format dspace
spelling todo:paper_15244695_v27_n2_p193_Yorio2023-10-03T16:20:55Z Foraging patterns of breeding Olrog's Gull at Golfo San Jorge, Argentina Yorio, P. Quintana, F. Gatto, A. Lisnizer, N. Suárez, N. Argentina Foraging patterns Larus atlanticus Olrog's Gull Patagonia foraging behavior radiotelemetry seabird spatial distribution Atlantic Ocean Golfo San Jorge Atlanticus Aves Decapoda (Crustacea) Larus Larus atlanticus Larus atlanticus The spatial distribution and use of feeding areas by Olrog's Gull (Larus atlanticus) breeding within a 34 km2 inlet at Golfo San Jorge, Argentina was investigated. Radio-transmitters were deployed on eight breeding adult birds during the late incubation period in 2001. Feeding areas were identified by means of radio-telemetry on the basis of 93 bird locations during a total of 89 foraging trips, and by direct observation of instrumented birds on 23 occasions. Both telemetry and visual data indicated that Olrog's Gull fed almost exclusively within the inlet. In all, 85% of mapped locations (N = 93) were within 3 km of the colony, near the mouth of the inlet. The birds were consistent in the use of one particular area, and most of the tracked birds foraged mainly in one or two areas. Mean number of trips per day was 4.1 ± 0.99 (range = 1-9) and mean trip duration was 109 ± 31.2 min (range = 15-645 minutes). Both variables differed significantly among individuals. Gulls foraged at all states of the tide, although all eight individuals were more likely to forage during mid and low tides than during high tides. The small foraging range of Olrog's Gull is defined by the spatial extension of intertidal habitats with crabs, being their main prey during the breeding season. Our results confirm the relatively high ecological specialization of Olrog's Gulls shown in previous diet studies and their dependence on intertidal areas with grapsid crabs. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15244695_v27_n2_p193_Yorio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Foraging patterns
Larus atlanticus
Olrog's Gull
Patagonia
foraging behavior
radiotelemetry
seabird
spatial distribution
Atlantic Ocean
Golfo San Jorge
Atlanticus
Aves
Decapoda (Crustacea)
Larus
Larus atlanticus
Larus atlanticus
spellingShingle Argentina
Foraging patterns
Larus atlanticus
Olrog's Gull
Patagonia
foraging behavior
radiotelemetry
seabird
spatial distribution
Atlantic Ocean
Golfo San Jorge
Atlanticus
Aves
Decapoda (Crustacea)
Larus
Larus atlanticus
Larus atlanticus
Yorio, P.
Quintana, F.
Gatto, A.
Lisnizer, N.
Suárez, N.
Foraging patterns of breeding Olrog's Gull at Golfo San Jorge, Argentina
topic_facet Argentina
Foraging patterns
Larus atlanticus
Olrog's Gull
Patagonia
foraging behavior
radiotelemetry
seabird
spatial distribution
Atlantic Ocean
Golfo San Jorge
Atlanticus
Aves
Decapoda (Crustacea)
Larus
Larus atlanticus
Larus atlanticus
description The spatial distribution and use of feeding areas by Olrog's Gull (Larus atlanticus) breeding within a 34 km2 inlet at Golfo San Jorge, Argentina was investigated. Radio-transmitters were deployed on eight breeding adult birds during the late incubation period in 2001. Feeding areas were identified by means of radio-telemetry on the basis of 93 bird locations during a total of 89 foraging trips, and by direct observation of instrumented birds on 23 occasions. Both telemetry and visual data indicated that Olrog's Gull fed almost exclusively within the inlet. In all, 85% of mapped locations (N = 93) were within 3 km of the colony, near the mouth of the inlet. The birds were consistent in the use of one particular area, and most of the tracked birds foraged mainly in one or two areas. Mean number of trips per day was 4.1 ± 0.99 (range = 1-9) and mean trip duration was 109 ± 31.2 min (range = 15-645 minutes). Both variables differed significantly among individuals. Gulls foraged at all states of the tide, although all eight individuals were more likely to forage during mid and low tides than during high tides. The small foraging range of Olrog's Gull is defined by the spatial extension of intertidal habitats with crabs, being their main prey during the breeding season. Our results confirm the relatively high ecological specialization of Olrog's Gulls shown in previous diet studies and their dependence on intertidal areas with grapsid crabs.
format JOUR
author Yorio, P.
Quintana, F.
Gatto, A.
Lisnizer, N.
Suárez, N.
author_facet Yorio, P.
Quintana, F.
Gatto, A.
Lisnizer, N.
Suárez, N.
author_sort Yorio, P.
title Foraging patterns of breeding Olrog's Gull at Golfo San Jorge, Argentina
title_short Foraging patterns of breeding Olrog's Gull at Golfo San Jorge, Argentina
title_full Foraging patterns of breeding Olrog's Gull at Golfo San Jorge, Argentina
title_fullStr Foraging patterns of breeding Olrog's Gull at Golfo San Jorge, Argentina
title_full_unstemmed Foraging patterns of breeding Olrog's Gull at Golfo San Jorge, Argentina
title_sort foraging patterns of breeding olrog's gull at golfo san jorge, argentina
url http://hdl.handle.net/20.500.12110/paper_15244695_v27_n2_p193_Yorio
work_keys_str_mv AT yoriop foragingpatternsofbreedingolrogsgullatgolfosanjorgeargentina
AT quintanaf foragingpatternsofbreedingolrogsgullatgolfosanjorgeargentina
AT gattoa foragingpatternsofbreedingolrogsgullatgolfosanjorgeargentina
AT lisnizern foragingpatternsofbreedingolrogsgullatgolfosanjorgeargentina
AT suarezn foragingpatternsofbreedingolrogsgullatgolfosanjorgeargentina
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