AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS

AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS

An alternative methodology consisting in the application of acoustic techniques to asses detection and monitoring of toxic algal blooms is presented here. Successive steps in this direction led to already reported results [Blanc et al., 2000] achieved under the frame of a multidisciplinary research...

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Autores principales: Blanc,Silvia, Mosto,Patricia, de Milou,Marta E, Benítez,Carlos
Lenguaje:English
Publicado: Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2004
Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200009
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spelling oai:scielo:S0717-653820040002000092005-09-14AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMSBlanc,SilviaMosto,Patriciade Milou,Marta EBenítez,CarlosAn alternative methodology consisting in the application of acoustic techniques to asses detection and monitoring of toxic algal blooms is presented here. Successive steps in this direction led to already reported results [Blanc et al., 2000] achieved under the frame of a multidisciplinary research programme conducted in the Argentinean Naval Service of Research and Development. First efforts were focused in the examination of the acoustical scattering behaviour of single-species cultures of Skeletonema costatum. For this purpose a pulse-echo electronic equipment was developed, including home-made piezoelectric transducers with an operating frequency centred at 2.6 MHz. A slight modified Johnson's fluid-sphere model was used. Numerical Abundance estimates from at-lab acoustic determinations of Volume Backscattering Strengths were obtained. When they were compared with predicted values computed through the adopted model and traditional optical counting, satisfactory results were obtained. More recently, single cultures of dinoflagellates, namely, Gymnodinium sp., were selected to enable a further stage of acoustic laboratory measurements. Controlled observations of its optimum growth conditions along a six-months period have been performed. The effects of different patterns of light and temperature have been analysed. Simultaneous work on modifying existing models of Backscattering Cross-Sections to provide a realistic description of dinoflagellates physical properties is being performedinfo:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana (Concepción) v.68 n.2 suppl.TIProc 20042004-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200009en10.4067/S0717-65382004000200009
institution Scielo Chile
collection Scielo Chile
language English
description An alternative methodology consisting in the application of acoustic techniques to asses detection and monitoring of toxic algal blooms is presented here. Successive steps in this direction led to already reported results [Blanc et al., 2000] achieved under the frame of a multidisciplinary research programme conducted in the Argentinean Naval Service of Research and Development. First efforts were focused in the examination of the acoustical scattering behaviour of single-species cultures of Skeletonema costatum. For this purpose a pulse-echo electronic equipment was developed, including home-made piezoelectric transducers with an operating frequency centred at 2.6 MHz. A slight modified Johnson's fluid-sphere model was used. Numerical Abundance estimates from at-lab acoustic determinations of Volume Backscattering Strengths were obtained. When they were compared with predicted values computed through the adopted model and traditional optical counting, satisfactory results were obtained. More recently, single cultures of dinoflagellates, namely, Gymnodinium sp., were selected to enable a further stage of acoustic laboratory measurements. Controlled observations of its optimum growth conditions along a six-months period have been performed. The effects of different patterns of light and temperature have been analysed. Simultaneous work on modifying existing models of Backscattering Cross-Sections to provide a realistic description of dinoflagellates physical properties is being performed
author Blanc,Silvia
Mosto,Patricia
de Milou,Marta E
Benítez,Carlos
spellingShingle Blanc,Silvia
Mosto,Patricia
de Milou,Marta E
Benítez,Carlos
AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS
author_facet Blanc,Silvia
Mosto,Patricia
de Milou,Marta E
Benítez,Carlos
author_sort Blanc,Silvia
title AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS
title_short AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS
title_full AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS
title_fullStr AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS
title_full_unstemmed AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS
title_sort alternative proposal: acoustic techniques to asses detection and monitoring of toxic algal blooms
publisher Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate 2004
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200009
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