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Researchers should cite this work as follows:
Allain, V., Menkes, C., 2014. Nectalis 3 cruise, RV Alis. https://doi.org/10.17600/14004900
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This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License.
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|NECTALIS 3||http://campagnes.flotteoceanographique.fr/campagnes/14004900/ UTF-8 Website|
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South and west of New Caledonia EEZ
|Bounding Coordinates||South West [-24.046, 160], North East [-20.056, 168.354]|
Zooplankton is composed mainly of crustaceans measuring between 0.2mm and 2cm. Micronekton, which forms the food of tuna, is constituted of larger organisms: fish, shrimps or squids measuring between 2 and 20cm.
|Start Date / End Date||2014-11-22 / 2014-12-09|
The NECTALIS3 project studies the mid-trophic levels of the pelagic ecosystem of New-Caledonia: zooplankton and micronekton. Those components are the link between physical/chemical factors which influence their distribution and abundance, and fish exploited resources, particularly tuna, which are their predators. To complement a larger project based on observations, technology and modelling, we propose a multidisciplinary cruise to collect sea water physical and chemical data as well as data on zooplankton and micronekton. To characterise physico-chemical conditions and primary production, we measure temperature, salinity, oxygen, fluorescence, light, currents, nutrients, photosynthetic pigments, phytoplankton abundance, primary production, phytoplanktonic communities. Secondary production (zooplankton, micronekton) is measured with acoustic (TAPS, S-ADCP, L-ADCP, EK60) and net sampling of zooplankton and micronekton. This cruise is complemented by physical, chemical and biogeochemical modelling, by tuna diet study and by modelling of the pelagic ecosystem including several sub-models. Specialists in dynamic, acoustic, biogeochemistry, oceanography, biology and fisheries coming from different research institutions collect, analyse and model observations on the mid-trophic levels. We have two goals: 1) sustainable fish resources management with the improvement of our understanding of spatio-temporal distribution and behaviors of the tuna preys to eventually better understand tuna-environment relationships 2) conservation and protection of offshore waters by providing new information on pelagic biodiversity to contribute to the identification of ecologically and biologically significant areas in the Caledonian EEZ.
|Title||NECTALIS 3 scientific cruise, micronekton collection|
|Funding||The Nectalis 3 cruise received the financial support of IRD, SPC and AAMP (French Marine Protected Areas), now Agence Française de la Biodiversité (AFB). Data prepared and published under project "Capacity building and data mobilization for conservation and decision making in the South Pacific" - BID-PA2016-0002-REG|
The personnel involved in the project:
Based on acoustic signal of EK60 we used a mesopelagic midwater trawl (Micronekton pelagic trawl 24mx24m) to target acoustic layers and collect micronekton organisms.
|Study Extent||South and West of the New Caledonia EEZ on a daily basis during the NECTALIS cruise|
|Quality Control||Species identification made by taxonomists|
Method step description:
- Three methods were used to estimate zooplankton (organisms 2 µm – 20 mm) biomass: a Tracor Acoustic Profiling System (TAPS), net sampling and Ship-Borne Acoustic Doppler Current Profilers (S-ADCP).
- Three methods were used to estimate micronekton (organisms 2 - 20 cm) biomass and species composition: using an EK60 echosounder, net sampling and the S-ADCP
|Collection Name||Nectalis3 collection|
|Specimen preservation methods||Formalin, Deep frozen, Alcohol|
- Menkes, C., Allain, V., Rodier, M., Gallois, F., Lebourges-Dhaussy, A., Hunt, B.P.V., Smeti, H., Pagano, M., Josse, E., Daroux, A., Lehodey, P., Senina, I., Kestenare, E., Lorrain, A., Nicol, S.J., 2015. Seasonal oceanography from physics to micronekton in the south-west Pacific. Deep Sea Research Part II: Topical Studies in Oceanography. 113:125-144. DOI 10.1016/j.dsr2.2014.10.026 10.1016/j.dsr2.2014.10.026
marine, harvested by iOBIS