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Marine Ecology Progress Series

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MEPS 597:231-242 (2018)  -  DOI:

Long-term changes in the breeding seasonality of Peruvian seabirds and regime shifts in the Northern Humboldt Current System

Giannina Passuni1,*, Christophe Barbraud2, Alexis Chaigneau3, Arnaud Bertrand4, Ricardo Oliveros-Ramos5, Jesus Ledesma5, Ramiro Castillo5, Marilu Bouchon5, Sophie Bertrand4

1Department of Zoology, Nelson Mandela University, PO Box 77000, Port Elizabeth 6031, South Africa
2Centre d’Etudes Biologiques de Chizé, UMR7372 CNRS-Université La Rochelle, 79360 Villiers en Bois, France
3Laboratoire d’Etudes en Géophysique et Océanographie Spatiale, UMR CNRS, CNES, IRD, Université P. Sabatier, 14 Avenue Edouard Belin 31400 Toulouse, France
4Institut de Recherche pour le Développement (IRD), UMR MARBEC, Marine Biodiversity, Exploitation and Conservation, Avenue Jean Monnet, BP 171, 34203 Sète Cedex, France
5Instituto del Mar del Peru (IMARPE), Esquina Gamarra y General Valle S/N Chucuito, Callao, Peru
*Corresponding author:

ABSTRACT: In the highly productive Northern Humboldt Current System, 3 seabird species, the Guanay cormorant Phalacrocorax bougainvillii, the Peruvian booby Sula variegata and the Peruvian pelican Pelecanus thagus, commence breeding in austral spring, coinciding with the lowest availability of their prey, the Peruvian anchovy Engraulis ringens. This strategy ensures the matching of increased prey availability when young achieve independence in summer. This pattern was observed during the last decade when anchovy was abundant. However, over the last century, the abundance of anchovy has varied widely due to contrasting interdecadal regimes in oceanographic conditions and fishing activity. We hypothesized that these regime shifts affected the abundance and availability of prey and may have conditioned the breeding seasonality of seabirds. We examined the timing and magnitude of the onset of breeding using dynamic occupancy models and related these parameters to the seasonality of oceanographic conditions, abundance of anchovy and fishing pressure. During a regime of lower anchovy abundance (1977-1990), cormorants showed the highest flexibility, adjusting the timing of breeding from spring to winter and skipping reproduction in the worst conditions. Boobies showed the lowest flexibility, maintaining the same magnitude and timing of onset of breeding in spring. Pelicans showed intermediate flexibility, foregoing breeding during the worst conditions, but maintaining the onset of breeding in spring. The 3 species used sea surface temperature as a cue for the initiation of breeding. Furthermore, given their better diving abilities, cormorants could monitor prey availability changes associated with the reversion in the seasonality of the oxycline depth.

KEY WORDS: Onset of breeding · Environmental cues · Oxycline depth · NHCS · Northern Humboldt Current System · Phalacrocorax bougainvillii · Sula variegata · Pelecanus thagus

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Cite this article as: Passuni G, Barbraud C, Chaigneau A, Bertrand A and others (2018) Long-term changes in the breeding seasonality of Peruvian seabirds and regime shifts in the Northern Humboldt Current System. Mar Ecol Prog Ser 597:231-242.

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