Conference
Characterization of micronektonic spatial structure using ecosystemic acoustics descriptors applied in three Atlantic African Large Marine Ecosystems
| العنوان: | Characterization of micronektonic spatial structure using ecosystemic acoustics descriptors applied in three Atlantic African Large Marine Ecosystems |
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| المؤلفون: | Mouget, Anne, Behagle, Nolwenn, Perrot, Yannick, Tiedemann, Maik, Migayrou, Chloé, Sarré, Abdoulaye, Uanivi, U., Rodriguez, Elizandro, Jeyid, M.A., El Ayoubi, Salaheddine, Kouassi, A.M., Berne, A., Mbye, Ebou Mass, Brehmer, Patrice |
| المساهمون: | Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD), Institut Sénégalais de Recherches Agricoles Dakar (ISRA), Instituto Nacional de Desenvolvimento das Pescas (INDP), Centre de Recherches Océanologiques Abidjan (CRO), Brehmer, Patrice |
| المصدر: | ICAWA : International Conference AWA ; https://hal.science/hal-02779958 ; Brehmer, Patrice. ICAWA : International Conference AWA, Apr 2018, Lanzarote, Spain. SRFC/CSRP; IRD, pp.46-147, 2019 |
| بيانات النشر: | HAL CCSD SRFC/CSRP IRD |
| سنة النشر: | 2018 |
| المجموعة: | Université de Bretagne Occidentale: HAL |
| مصطلحات موضوعية: | AFRIQUE DE L'OUEST, ATLANTIQUE, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDE.MCG]Environmental Sciences/Global Changes, [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
| جغرافية الموضوع: | Lanzarote, Spain |
| الوصف: | ICAWA : International Conference AWA, Lanzarote, ESP, 17-/04/2018 - 20/04/2018 ; Using the segmentation algorithm within Matecho (Perrot et al., 2018) we are able to deliver 15 descriptors to characterize the acoustic micronektonic layers in the water column. Even if the species composition is not known, these descriptors which are obtained using the same methodology allow for comparison between ecosystems and to study inter-annual variability. Some of these descriptors are new and others are based on the ones usually used to characterize pelagic fish schools using echointegration per shoal (Weill et al., 1993). In this work we will focus on the new ones and show some application cases in the three Atlantic African Large Marine Ecosystems, to monitor potential perturbations due to global change. All layer descriptors are estimated per layer and per elementary sampling unit of 0.1 nautical miles (ESU) with an accuracy of 1 meter depth. In this study we present four classes of descriptors: spatial (e.g. altitude, mean depth, minimal depth); morphological (e.g. width, ESU number, filling rate of water column); acoustic (e.g. mean volume backscattering strength Sv (dB)) and the layer number per ESU. In this study we focus on the original descriptors: (i) Filling rate of the water column (%): this indicator is based on the calculation of the width of the micronektonic layer vs. the local bottom depth. (ii) Filling rate contribution of first layer (%): this indicator shows the contribution of the first layer (the closest layer of surface) in the global filling rate. It is computed by dividing the filling rate of first layer by the filling rate of all layers. (iii) Number of layers: this indicator is calculated for each ESU, giving the number of layers in this water column. The descriptors have been computed over more than 1 million of ESUs, 992 737 in the CCLME, 166 183 in the GCLME and 462 807 in the BCLME. Such descriptors allow classification of micronekton layers and appear relevant to monitor changes in the ... |
| نوع الوثيقة: | conference object still image |
| اللغة: | English |
| Relation: | IRD: fdi:010078276 |
| الاتاحة: | https://hal.science/hal-02779958 |
| رقم الانضمام: | edsbas.5C3F0160 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |