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Archived data
Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution 4.0 International License.

Notes: Only data aggregated per 1-degree cell are available through OBIS. The non-aggregated data are available through the OBIS-SEAMAP Portal

Description
GPS loggers and time-depth recorders were used to haracterize the foraging behavior of the sexually dimorphic Peruvian booby Sula variegata on 2 islands in northern Peru. We evaluated whether (1) its foraging behavior differed from tropical boobies and temperate gannets (the Peruvian boobies feed in areas of enhanced productivity and high fish density), and (2) females and males exploited different foraging habitats as a consequence of size dimorphism. more

Birds foraged only during daylight hours, 1 to 3 times a day, in trips of short duration (median = 1.8 h). Overall, 92% of the total foraging time was spent flying. They fed exclusively on anchovetas Engraulis ringens, which were captured in shallow dives (median = 2.5 m, max = 8.8 m) with a dive median rate of 11 dives h–1 (max = 37 dives h–1). The median foraging range was 25 km (max = 68 km), whereas the median total distance traveled was 69 km (max = 179 km). Foraging site fidelity was high, and the orientation of foraging flights in any given day was similar among birds that departed at the same time. There were no sex-specific differences in 13 of 15 foraging variables; however, females dived slightly deeper and spent a larger proportion of time sitting on the water. We speculate that (1) the foraging behavior of Peruvian boobies contrasts with that of their tropical and temperate relatives as a result of the proximity and predictability of food sources, elevated energetic demands of the brood (up to 4 chicks) and high prey encounter rate in the Peruvian upwelling system, and (2) the lack of spatial segregation between sexes may be related to the attraction of birds to feeding aggregations that are formed in the vicinity of the colonies. Once the foraging patches are localized, females dive deeper because of passive mechanisms associated with a heavier mass. This dataset is a summarized representation of the telemetry locations aggregated per species per 1-degree cell.

Scope
Themes:
Biology > Birds
Keywords:
Marine, ISE, Peru, Sulidae

Geographical coverage
ISE, Peru [Marine Regions]

Temporal coverage
22 December 2006 - 29 December 2006

Taxonomic coverage
Sulidae [WoRMS]

Parameter
Occurrence of biota

Contributors
Duke University; Nicholas School of the Environment and Earth Sciences; Marine Laboratory, more
Universidad Científica del Sur, moredata creator

Related datasets
Published in:
OBIS-SEAMAP: Spatial Ecological Analysis of Megavertebrate Populations, more

Publication
Based on this dataset:
Zavalaga, C.B. et al. (2010). At-sea movement patterns and diving behavior of Peruvian boobies Sula variegata in northern Peru . Mar. Ecol. Prog. Ser. 404: 259-274. hdl.handle.net/10.3354/meps08490, more

Dataset status: Completed
Data type: Data
Data origin: Research: field survey
Metadatarecord created: 2015-03-19
Information last updated: 2015-03-19
All data in IMIS is subject to the VLIZ privacy policy