MICROTON

Type Oceanographic cruise
Ship Antea
Ship owner IRD
Dates 20/03/2010 - 04/04/2010
Chief scientist(s) MENARD Frédéric

IRD CENTRE DE SETE

Avenue Jean Monnet

BP171

34203 SETE CEDEX

(33)(0)4 99 57 32 00

montpellier@ird.fr

http://www.mpl.ird.fr/
DOI 10.17600/10110010
Objective

MICROTON will study the dynamics and role played by micronektonic organisms in trophic functioning of deep sea pelagic ecosystems. This involves identifying and understanding the mechanisms underlying the spatial organization of these marine organisms which are the prey of large predatory fish (tuna, swordfish). The spatial dynamics are studied in the vertical and horizontal dimensions, by quantifying the impact of the abiotic environment: species composition, aggregating behaviours and nycthemeral cycles on the water column, depending on the horizontal and vertical physical characteristics of the water bodies (thermocline density and depth, deep maximum of chlorophyll, dissolved oxygen). The species composition of the micronekton community made up of various zoological groups (Fish, cephalopods, crustaceans, jelly fish) and its food web structure (studying trophic positions in food chains using isotope tracers) will be studied and links with higher-order predators established. The results will provide knowledge which is essential for a ecosystem-based approach to tuna resource management. This falls (partly) under the MESOBIO project.

Data managed by SISMER

Bibliography

Publications

Annasawmy Angelee Pavanee, Menard Frédéric, Marsac Francis, Ternon Jean-Francois, Cherel Yves, Romanov Evgeny, Le Loch Francois (2024). Environmental variability shapes trophic and resource partitioning between epipelagic and mesopelagic biomes in oceanic provinces: Implications in a globally changing ocean. Progress In Oceanography, 229, 103339 (17p.). https://doi.org/10.1016/j.pocean.2024.103339


Marsac Francis, Annasawmy Pavanee, Noyon Margaux, Demarcq Herve, Soria Marc, Rabearisoa Njaratiana, Bach Pascal, Cherel Yves, Grelet Jacques, Romanov Evgeny (2020). Seamount effect on circulation and distribution of ocean taxa in the vicinity of La Pérouse, a shallow seamount in the southwestern Indian Ocean. Deep-sea Research Part Ii-topical Studies In Oceanography, 176, 104806 (18p.). Publisher's official version : https://doi.org/10.1016/j.dsr2.2020.104806 , Open Access version : https://archimer.ifremer.fr/doc/00631/74286/


Annasawmy P., Ternon J. F., Marsac F., Cherel Y., Behagle N., Roudaut G., Lebourges-Dhaussy A., Demarcq H., Moloney C. L., Jaquemet S., Menard F. (2018). Micronekton diel migration, community composition and trophic position in two biogeochemical provinces of the South West Indian Ocean: Insight from acoustics and stable isotopes. Deep-sea Research Part I-oceanographic Research Papers, 138, 85-97. https://doi.org/10.1016/j.dsr.2018.07.002