English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/27009
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

A new noise detected in the ocean

AutorGuerra, Ángel ; Martinell, Xavier; González, Ángel F. ; Vecchione, Michael; Gracia, Joaquín; Martinell, Jordi
Fecha de publicación2007
EditorCambridge University Press
CitaciónJournal of the Marine Biological Association of the United Kingdom 87(5): 1255-1256 (2007)
ResumenMany observers have noted that the sea is full of loud sounds, both ongoing and episodic. Among the many sources of natural ambient noise are wave action, physical processes such as undersea earthquakes, and biological activities of shrimps, fish, dolphins and whales. Despite interest by acoustics experts, sound production by cephalopods has been reported only twice, both involving squid. The 'faint poppings' produced were thought to result from fluttering of the thin external lips of the squid's funnel while water is being expelled through it. Otherwise, no information is available on cephalopod sounds. Here we present a noise produced by a stressed common octopus. The event was filmed and recorded in the wild. The hypothesis we offer to explain how this sound was produced is cavitation, which has been documented in several biological systems. In our case, the water expelled through the funnel may have created a jet with a velocity so high that the turbulent pressure dropped locally below the vapour pressure of the water. Seawater contains gas microbubbles, which will grow in size when they are entrained in the region of low pressure. Subsequently, the bubbles collapse violently when pressure rises again. The sound produced by the octopus is like a gunshot, and distinct lights observed at the same time contradict the existence of a simple pressure wave and point to the possible presence of gas-bubbles, which would change the light intensity by reflection and refraction of the sunlight. This behaviour seems to be a defensive strategy to escape from vibration-sensitive predators.
Descripción2 páginas, 1 figura.
Versión del editorhttp://dx.doi.org/10.1017/S0025315407058225
URIhttp://hdl.handle.net/10261/27009
DOI10.1017/S0025315407058225
ISSN0025-3154
Aparece en las colecciones: (IIM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
articulo-pulpo.pdf445,42 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.