Academic Journal
Comparative analysis of Diel Vertical migration between three Atlantic African large marine ecosystems [résumé de poster] ; International conference ICAWA 2017 and 2018 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters
| العنوان: | Comparative analysis of Diel Vertical migration between three Atlantic African large marine ecosystems [résumé de poster] ; International conference ICAWA 2017 and 2018 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters |
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| المؤلفون: | Tiedemann, M., /Brehmer, Patrice, /Mouget, Anne, El Ayoubi, S., /Behagle, Nolwenn, /Perrot, Yannick, Charouki, N., Migayrou, C., Uanivi, U., Jeyid, M.A., Mbye, E.M., Rodriguez, E., Sarré, A. |
| المساهمون: | /Brehmer, Patrice (ed.), Diogoul, N. (collab.), Zenk, C. (collab.), Vareilles, M. de (collab.), Keenlyside, N. (collab.), Nascimento, J.M. (collab.), Ramos, V. M. (collab.), Sow, B.A. (collab.), Fock, H. (collab.), Schmidt, J. (collab.), Ekau, W. (collab.), Mbaye, A. (collab.), Fall. A. (collab.), Monteiro, I. (collab.), Kouassi, A.M. (collab.), Silva, O. (collab.), /Brochier, Timothée (collab.), Sall. M. (collab.), Mayif, M. (collab.), Koné, V. (collab.), /Gorgues, Thomas (collab.), Ferreira Santos, C. (collab.), Bamy, I.L. (collab.), Barry, I. (collab.), Sidibe, M. (collab.), Diadhou, H. (collab.) |
| بيانات النشر: | SRFC/CSRP IRD |
| سنة النشر: | 2019 |
| المجموعة: | IRD (Institute de recherche pour le développement): Horizon |
| جغرافية الموضوع: | AFRIQUE DE L'OUEST, ATLANTIQUE |
| الوصف: | Diel vertical migration (DVM) of micronekton is a behavioural mechanism driven by a trade-off between predator avoidance and access to prey. This trade-off is controlled by environmental forcing that can lead to changes of DVM pattern under changing environmental conditions. Time series of hydro acoustic surveys between 1995 – 2015 of three large Atlantic ecosystems (Canary Current - CCLME, Guinea Current - GCLME, and Benguela Current - BCLME) were analysed to calculate DVM patterns based on volume backscattering strength (Sv). DVM related descriptors (n=15) were calculated for areas according to bathymetric definitions (shelf = 10 – 150 m bottom depth, slope = 150 – 500 m bottom depth, and plain > 500 m bottom depth). Typical DVM I pattern, with micronekton descending during daytime and ascending during night-time, were observed on the slope and plain in all three ecosystems, but not on the shelf with only negative day-night values in the CCLME and BCLME. Lower daytime Sv values during the day compared to night-time suggest either less dense patches of micronekton leading to negative day-night differences in the CCLME and GCLME or insufficient measurements of certain depth strata (e.g., 0 – 10 m surface). Only a few significant and different DVM descriptors suggest a change in the CCLME and the GCLME in the last 20 years. All other insignificant descriptors assume natural variability in large Atlantic ecosystems. Our results provide insight into inter-annual variability in micronekton DVM patterns. |
| نوع الوثيقة: | text |
| اللغة: | English |
| Relation: | https://www.documentation.ird.fr/hor/fdi:010078281; oai:ird.fr:fdi:010078281; Tiedemann M., Brehmer Patrice, Mouget Anne, El Ayoubi S., Behagle Nolwenn, Perrot Yannick, Charouki N., Migayrou C., Uanivi U., Jeyid M.A., Mbye E.M., Rodriguez E., Sarré A., . Comparative analysis of Diel Vertical migration between three Atlantic African large marine ecosystems [résumé de poster]. In : Brehmer Patrice (ed.), Diogoul N. (collab.), Zenk C. (collab.), Vareilles M. de (collab.), Keenlyside N. (collab.), Nascimento J.M. (collab.), Ramos V. M. (collab.), Sow B.A. (collab.), Fock H. (collab.), Schmidt J. (collab.), Ekau W. (collab.), Mbaye A. (collab.), Fall. A. (collab.), Monteiro I. (collab.), Kouassi A.M. (collab.), Silva O. (collab.), Brochier Timothée (collab.), Sall. M. (collab.), Mayif M. (collab.), Koné V. (collab.), Gorgues Thomas (collab.), Ferreira Santos C. (collab.), Bamy I.L. (collab.), Barry I. (collab.), Sidibe M. (collab.), Diadhou H. (collab.), . International conference ICAWA 2017 and 2018 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters SRFC/CSRP; IRD, 2019, p. 153 ICAWA : International Conference AWA, 5., Lanzarote (ESP), 2018/04/17-20 |
| الاتاحة: | https://www.documentation.ird.fr/hor/fdi:010078281 |
| رقم الانضمام: | edsbas.10C0999C |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |