{"id":25472,"date":"2026-02-24T14:23:38","date_gmt":"2026-02-24T13:23:38","guid":{"rendered":"https:\/\/www.mio.osupytheas.fr\/?p=25472"},"modified":"2026-03-04T11:44:36","modified_gmt":"2026-03-04T10:44:36","slug":"mio-nicolas-seon-seminar","status":"publish","type":"post","link":"https:\/\/www.mio.osupytheas.fr\/en\/seminaire-mio-nicolas-seon\/","title":{"rendered":"MIO Seminar - Nicolas Seon, postdoctoral researcher at the Centre d'Etude Biologique de Chiz\u00e9 - Thursday 5 March 2026 - Salle Alboran"},"content":{"rendered":"
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On the following subject: Trophic ecology of the Ross seal (Ommatophoca rossii): contribution of bulk isotopy and amino acids.<\/span><\/em><\/p>

Le Thursday 5 March 2026<\/strong> \u00e0 13h00<\/strong> in the Alboran room, and will remain available to discuss his work afterwards until 3.00 pm.<\/p>

Seminar zoom link<\/strong><\/a><\/p>

\u00a0<\/p>

Abstract<\/strong><\/h4>

Because they tend to spend most of the year at sea, Ross's seals (Ommatophoca rossii<\/em>) is one of the least studied marine mammal species in the Southern Ocean. Direct physical encounters, which are necessary for instrumentation and biological sampling, are therefore limited to the short moulting period or the weaning of newborn pups when they are on the pack ice. As a result, fundamental aspects of the biology of the Ross seal, such as its trophic ecology, remain poorly understood. The measurement of global carbon isotope values (\u03b4<\/em>\u00b9\u00b3Cbulk<\/sub>) and nitrogen (\u03b4<\/em>\u00b9\u2075Nbulk<\/sub>) of blood, fur, epidermis and vibrissae from 48 seals sampled in the Indian sector of the Southern Ocean, carried out as part of this study, provides valuable information on this subject. Statistical analyses revealed no disparities between males and females, but a significant difference in bulk isotope values between tissues, raising questions about the trophic ecology of Ross's seals throughout the year.<\/p>

However, bulk nitrogen isotope data has one major limitation: it reflects both the trophic information of predators and the values at the base of food webs, which are seasonally variable and often difficult to estimate. Superimposing these two signals reveals the inherent limitations of this method, particularly for highly mobile predators. To remove the uncertainties surrounding the origin of variations in \u03b4<\/em>15<\/sup>Nbulk<\/sub>, the measurement of \u03b4<\/em>15<\/sup>N of amino acids plays a key role in distinguishing the contribution of environmental factors from that of trophic changes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Sur le sujet suivant : Ecologie trophique du phoque de Ross (Ommatophoca rossii) : apport de l\u2019isotopie bulk et des acides amin\u00e9s. Le jeudi 5 mars 2026 \u00e0 13h00 en […]<\/p>\n","protected":false},"author":266,"featured_media":25475,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,39],"tags":[],"class_list":["post-25472","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-seminaire-mio"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/posts\/25472","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/users\/266"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/comments?post=25472"}],"version-history":[{"count":7,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/posts\/25472\/revisions"}],"predecessor-version":[{"id":25541,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/posts\/25472\/revisions\/25541"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/media\/25475"}],"wp:attachment":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/media?parent=25472"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/categories?post=25472"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/tags?post=25472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}