CESIMAR - CENPAT   25625
CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Unidad Ejecutora - UE
artículos
Título:
Flash and grab: deep-diving southern elephant seals trigger anti-predator flashes in bioluminescent prey
Autor/es:
PAULINE GOULET; JULIETA CAMPAGNA; CLAUDIO CAMPAGNA; MARK JOHNSON; CHRISTOPHE GUINET; PETER LLOYD TYACK
Revista:
JOURNAL OF EXPERIMENTAL BIOLOGY
Editorial:
COMPANY OF BIOLOGISTS LTD
Referencias:
Lugar: Cambridge; Año: 2020 vol. 223 p. 1 - 11
ISSN:
0022-0949
Resumen:
Bioluminescence, which occurs in approximately 80% of the world?s mesopelagic fauna, can take the form of a low-intensity continuous glow (e.g. for counter-illumination or signalling) or fast repetitions of brighter anti-predatory flashes. The southern elephant seal (SES) is a major consumer of mesopelagic organisms, in particular the abundant myctophid fish, yet the fine-scale relationship between this predator?s foraging behaviour and bioluminescent prey remains poorly understood. We hypothesised that brief, intense light emissions should be closely connected with prey strikes when the seal is targeting bioluminescent prey that reacts by emitting anti-predator flashes. To test this, we developed a biologging device containing a fast-sampling light sensor together with location and movement sensors to measure simultaneously anti-predator bioluminescent emissions and the predator?s attack motions with a 20 ms resolution. Tags were deployed on female SES breeding at Kerguelen Islands and Penınsula Vadés, Argentina. In situ light levels in combination with duration of prey capture attempts indicated that seals were targeting a variety of prey types. For some individuals, bioluminescent flashes occurred in a large proportion of prey strikes, with the timing of flashes closely connected with the predator?s attack motion, suggestive of antipredator emissions. Marked differences across individuals and location indicate that SES do exploit bioluminescent organisms but the proportion of these in the diet varies widely with location. The combination of wideband light and acceleration data provides new insight into where and when different prey types are encountered and how effectively they might be captured