Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Suliformes Sulidae

Scientific Name: Sula variegata
Species Authority: (Tschudi, 1843)
Common Name(s):
English Peruvian Booby
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Ekstrom, J., Butchart, S., Calvert, R.
This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be fluctuating, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Previously published Red List assessments:
2009 Least Concern (LC)
2008 Least Concern (LC)
2004 Least Concern (LC)
2000 Lower Risk/least concern (LR/lc)
1994 Lower Risk/least concern (LR/lc)
1988 Lower Risk/least concern (LR/lc)

Geographic Range [top]

Range Description: The Peruvian Booby is found in the area of the Humboldt Current, breeding from northern Peru to central Chile, with non-breeders being found as far as south-west Ecuador1.
Countries occurrence:
Chile; Colombia; Ecuador; Peru
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 540
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): No
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: No
Upper elevation limit (metres): 100
Range Map: Click here to open the map viewer and explore range.

Population [top]

Current Population Trend: Stable
Additional data:
Continuing decline of mature individuals: Unknown
Extreme fluctuations: No Population severely fragmented: No
Continuing decline in subpopulations: Unknown
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: No

Habitat and Ecology [top]

Habitat and Ecology: This strictly marine species feeds close to the coast in cool, rich waters of upwellings where food is abundant. It feeds almost exclusively on abundant supplies of anchovetta, but will switch to other fish species when stocks collapse. Feeding mostly occurs by plunge-diving from moderate height, usually in groups of more than 30-40 individuals. Breeding is only loosely seasonal on bare, arid islets along rocky coasts, mostly on cliff ledges in Chile, but preferring open, flat ground in Peru. It is largely sedentary, but will disperse widely during El Nino years (del Hoyo et al. 1992).
Systems: Terrestrial; Marine
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 10.6
Movement patterns: Not a Migrant
Congregatory: Congregatory (and dispersive)

Citation: BirdLife International. 2012. Sula variegata. The IUCN Red List of Threatened Species 2012: e.T22696686A40298921. . Downloaded on 10 October 2015.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided