{"id":200,"date":"2018-01-06T10:13:39","date_gmt":"2018-01-06T10:13:39","guid":{"rendered":"http:\/\/mobydick.mio.osupytheas.fr\/?page_id=200"},"modified":"2019-04-23T14:13:31","modified_gmt":"2019-04-23T14:13:31","slug":"objectives","status":"publish","type":"page","link":"https:\/\/mobydick.mio.osupytheas.fr\/?page_id=200","title":{"rendered":"Objectives"},"content":{"rendered":"\t\t
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Description of the biodiversity<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i>\n\t\t\t\t\t\t\t\t<\/i>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tTo provide an extensive description of community structures at the different trophic levels in contrasted marine food webs characterized by their primary production regimes <\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Compared to previous studies, the originality of MOBYDICK is the concurrent investigation of pelagic biodiversity at all trophic levels and of every functional group from picoplankton to top predators, together with data acquisition of environmental drivers including dissolved and particulate nutrients.<\/h6><\/div><\/div><\/div><\/div><\/div><\/div><\/div>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 To achieve this objective, the diversity of procaryotes<\/b> has been investigated all over the water column from surface to the mesopelagic realm. Diatoms<\/b> are classically mentioned as the major primary producers in the SO and their diversity was described in detail in previous studies. By contrast, other phytoplankton groups such as haptophytes<\/b> and dinoflagellates<\/b> were far less studied, and MOBYDICK payed special attention to these organisms as recent findings suggest their importance for vertical C export efficiency even in the Southern Ocean. Focus has also been put on potential parasites<\/b>, organic matter decomposers<\/b> and endosymbionts<\/b> that represent other functional groups that were missed by classical approaches. Within micro\u2013 (20\u2013200 \u03bc<\/i>m) and mesozooplankton (200 \u03bc<\/i>m\u20132 cm), organisms such as pteropods<\/b> have also been overlooked although evidence from zooplankton community studies indicates that they are consistent, and sometimes dominant components of the Southern Ocean zooplankton. Heterotrophic dinoflagellates have previously been identified as the most important group of phytoplankton grazers in the Kerguelen region, shedding new light on the roles of dinoflagellates and ciliates<\/b> in the transfer of C to mesozooplankton. Within macrozooplankton \/ micronekton<\/strong> (2\u201320 cm), copepods<\/b> and krill<\/b> were intensively studied. By contrast, our knowledge on other macrozooplankton remains limited, and of particular interest in the SO are gelatinous zooplankton<\/b> including salps<\/b> and ctenophores<\/b>. Finally, the lack of consideration for myctophids<\/b> (lanternfishes) and other nektonic organisms such as squids<\/b>, whereas they form a major component of\u00a0fish biomass ,\u00a0has led to a simplistic vision of a general central role of the krill Euphausia superba<\/i> in food webs of the Southern Ocean. MOBYDICK fills this gap by providing a detailed description of of the biological diversity associated to these groups.<\/h6><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Estimation of carbon sequestration and transfer<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i>\n\t\t\t\t\t\t\t\t<\/i>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tTraking the key element C from its initial fixation, its cycling within, and transfer across trophic levels, and its final export towards the ocean interior.<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 During MOBYDICK, the combined information on taxonomy, C stock partitioning, and C flows will provide unprecedented information on key players and their roles in C-cycling in end-to-end food webs of contrasted ecosystems. This objective will be addressed through answers to the three following specific questions :<\/h6>