Mª Ángeles Peña asiste al Working Group on Fisheries Acoustics Science and Technology del ICES

Una investigadora del Centro Oceanográfico de Baleares del IEO asiste a la reunión anual organizada por el ICES "Working Group on Fisheries Acoustics Science and Technology" que se celebra en Reykjavik (Islandia) entre los días 9 a 13 de mayo.

En la reunión presenta un trabajo sobre el estudio del zooplancton y micronecton por metodos acústicos en aguas de Baleares,en el que se ajustan los modelos teóricos existentes a las especies del mar Balear y a la respuesta en las diferentes frecuencias de las mismas. El estudio está enmarcado dentro del proyecto del Plan Nacional de I+D+i, Estructura y dinámica del ecosistema bentopelágico de talud en dos zonas oligotróficas del Mediterráneo occidental: una aproximación multidisciplinar y a distintas escalas temporales en las Islas Baleares (IDEADOS).

Título: Evaluation of the forward models available for the species sampled during the IDEADOS surveys

Autores: Marian Peña, Magdalena Iglesias, Joan Miquel and Pilar Olivar.

Abstract: Seasonal differences between the acoustic echograms of zooplankton and micronecton species recorded during the winter and summer surveys on the shelf and slope in the Balearic waters are evaluated. Several forward models for the species sampled with pelagic trawling and plankton nets are examined for the frequencies available (18, 38, 70, 120 and 200 Khz), particularly for the first three, where deeper layers can be considered. We present an experimental mask to help the comparison between those models and the echograms. Changes of the acoustic response with depth, size and frequency are evaluated. Main organisms found along the water column were species of mictofiforms and stomiforms (mainly Cyclothone braueri), northern krill, tunicates and jellyfish, and to a lesser extent some siphonophores and cephalopods.