https://doi.org/10.82144/89b7d89f https://seamap.env.duke.edu/dataset/1102 https://www.gbif.org/dataset/a4e8b0ab-0e79-4489-8712-1cf37d0114d6 https://obis.org/dataset/3851d670-56f7-46e1-bfd1-295378e2a910 Carlos Zavalaga Universidad Científica del Sur Primary contact czav_1999@yahoo.com avesfragatasperu.com OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu distributor Carlos Zavalaga Universidad Científica del Sur Primary contact czav_1999@yahoo.com avesfragatasperu.com owner 2025-07-31 eng Original provider: Carlos B. Zavalaga Dataset credits: Carlos B. Zavalaga Abstract: GPS loggers and time-depth recorders were used to characterize 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. 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. Marine Biology Telemetry Tagged animal Radio transmitters Animal movements Marine Animal Survey Seabirds Animal tagging N/A Due to incorrect date/time or coordinates, the following records in the original data sheets were removed: Bird ID 507 11:15:46, 3/8/2000, -80.821548, -7.104937 11:15:49, 13/08/2019, -80.8215, -7.105124 11:15:50, 13/08/2019, -80.821498, -7.105203 11:18:07, 13/08/2019, -80.815599, -7.10751 11:18:08, 13/08/2019, -80.815574, -7.107587 16:00:11, 5/1/2018, -80.779896, -7.11839 16:58:54, 5/4/2025, -80.760566, -167.071 16:09:57, 5/4/2025, -80.75794, -7.110085 Bird ID: 509 10:18:25, 13/08/2019, -80.693316, -7.032193 10:18:26, 13/08/2019, -80.693354, -7.032029 Bird ID: 530 12:25:10, 15/08/2019, -80.844323, -7.027227 12:25:11, 15/08/2019, -80.844369, -7.027112 This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License. https://seamap.env.duke.edu/dataset/1102 Oceans,Southern Pacific -81.10026 -80.372909 -6.807573 -7.526884 2007-12-10 2007-12-15 Scientific names are based on the Integrated Taxonomic Information System (ITIS). species Sula variegata Peruvian booby notPlanned Carlos Zavalaga Universidad Científica del Sur Primary contact czav_1999@yahoo.com avesfragatasperu.com NA NA NA Carlos Zavalaga owner NA zd_1102 2025-07-31T16:30:55-04:00 dataset Zavalaga, C. 2014. Movement patterns of Peruvian Boobies off Isla Lobos de Afuera 2007. Version 1.0.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/89b7d89f. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/1102 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/1102/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/1102/eml OBIS-SEAMAP zd_1102 zd_1102 Zavalaga CB, Halls JN, Mori GP, Taylor SA, Dell'omo G. 2010. At-sea movement patterns and diving behavior of Peruvian boobies Sula variegata in northern Peru. Mar Ecol Prog Ser: 404:259-274.