Pubblicazione scientifica

Radar detectors carried by Cape gannets reveal surprisingly few fishing vessel encounters

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità
trasformazione e commercializzazione

RIASSUNTO

Fisheries compete with seabirds for vanishing marine resources, but also produce fishery waste consumed by seabirds. Marine birds may therefore avoid or seek fishing vessels, and have evolved complex, plastic behavioural responses to vessel presence. Understanding these responses is essential to the conservation of a globally declining seabird community. We studied Cape gannets (Morus capensis), which compete with fisheries for reduced sardine (Sardinops sagax) resources in the Benguela upwelling region off South Africa. Using bird-borne GPS trackers coupled with newly-developed ship-radar detectors we show that foraging gannets seldom attended fishing vessels. Rather, they switched from eating scarce sardines or energetically-poor fishery waste to targeting locally abundant saury (Scomberesox saurus). This pelagic fish is brought into the seascape by warm water influx, and is not commercially exploited by fisheries. Cape gannets thereby show dietary plasticity, allowing them to maintain adult body condition and chick growth rates. This diet switch is a strong indicator that Cape gannets forage in an ecologically perturbed marine environment.

DATA

Data di pubblicazione: 06/02/2019

AUTORI

GREMILLET DAVID
COLLET JULIEN
WEIMERSKIRCH HENRI
COURBIN NICOLAS
RYAN PETER G
PICHEGRU LORIEN

ENTE DI AFFERENZA

CENTRE D’ECOLOGIE FONCTIONNELLE ET EVOLUTIVE UMR 5175 CNRS—UNIVERSITE DE MONTPELLIER—UNIVERSITE PAUL-VALERY MONTPELLIER—EPHE MONTPELLIER FRANCE
PERCY FITZPATRICK INST AFRICAN ORNITHOLOGY NRF DST CTR EXCELLENCE AT UNIV CAPE TOWN RONDEBOSCH SOUTH AFRICA
CENTRE D’ETUDES BIOLOGIQUES DE CHIZE UMR 7372 CNRS–UNIVERSITE LA ROCHELLE 405 ROUTE DE PRISSE LA CHARRIERE VILLIERS-EN-BOIS FRANCE
INST COASTAL MARINE RSCH & DEPT ZOOLOGY NELSON MANDELA UNIV PORT ELIZABETH SOUTH AFRICA
PHILLIP ISLAND NATURE PARKS AUSTRALIA

RIVISTA

PLoS ONE, 14(2), e0210328

IMPACT FACTOR

2,870

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