{"id":2172,"date":"2025-04-30T14:25:38","date_gmt":"2025-04-30T18:25:38","guid":{"rendered":"https:\/\/www.glft.org\/?p=2172"},"modified":"2025-04-30T14:25:38","modified_gmt":"2025-04-30T18:25:38","slug":"cracking-the-code-of-lake-whitefish-otoliths-complicates-stock-delineation","status":"publish","type":"post","link":"https:\/\/www.glft.org\/fr\/cracking-the-code-of-lake-whitefish-otoliths-complicates-stock-delineation\/","title":{"rendered":"D\u00e9crypter le code des otolithes de cor\u00e9gone de lac complique la d\u00e9limitation des stocks"},"content":{"rendered":"<div id=\"fws_69e1df9b571cc\"  data-column-margin=\"default\" data-midnight=\"dark\"  class=\"wpb_row vc_row-fluid vc_row\"  style=\"padding-top: 0px; padding-bottom: 0px; \"><div class=\"row-bg-wrap\" data-bg-animation=\"none\" data-bg-overlay=\"false\"><div class=\"inner-wrap\"><div class=\"row-bg viewport-desktop\"  style=\"\"><\/div><\/div><\/div><div class=\"row_col_wrap_12 col span_12 dark left\">\n\t<div  class=\"vc_col-sm-12 wpb_column column_container vc_column_container col no-extra-padding inherit_tablet inherit_phone\"  data-padding-pos=\"all\" data-has-bg-color=\"false\" data-bg-color=\"\" data-bg-opacity=\"1\" data-animation=\"\" data-delay=\"0\" >\n\t\t<div class=\"vc_column-inner\" >\n\t\t\t<div class=\"wpb_wrapper\">\n\t\t\t\t\r\n<div class=\"wpb_text_column wpb_content_element  vc_custom_1745949022401\" >\r\n\t<div class=\"wpb_wrapper\">\r\n\t\t<p>Alors que <a href=\"https:\/\/www.michigan.gov\/dnr\/education\/michigan-species\/fish-species\/whitefish\" target=\"_blank\" rel=\"noopener\">cor\u00e9gone de lac<\/a> Les populations sont en d\u00e9clin dans la majeure partie du lac Michigan, tandis que celles de la baie Green se maintiennent. Comprendre l&#039;origine natale du cor\u00e9gone de la baie Green pourrait aider les chercheurs \u00e0 d\u00e9limiter les stocks individuels, un outil de gestion important. Ce projet pilote visait \u00e0 constituer une biblioth\u00e8que de microchimie des otolithes afin d&#039;\u00e9valuer l&#039;origine natale du grand cor\u00e9gone. Il a ainsi d\u00e9couvert que les otolithes des larves de grand cor\u00e9gone refl\u00e8tent principalement leur origine maternelle, plut\u00f4t que leur origine natale.<\/p>\n\t<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\n\t\t\t<\/div> \n\t\t<\/div>\n\t<\/div> \n<\/div><\/div>\r\n\t\t<div id=\"fws_69e1df9b576dc\"  data-column-margin=\"default\" data-midnight=\"dark\"  class=\"wpb_row vc_row-fluid vc_row\"  style=\"padding-top: 0px; padding-bottom: 0px; \"><div class=\"row-bg-wrap\" data-bg-animation=\"none\" data-bg-overlay=\"false\"><div class=\"inner-wrap\"><div class=\"row-bg viewport-desktop\"  style=\"\"><\/div><\/div><\/div><div class=\"row_col_wrap_12 col span_12 dark left\">\n\t<div  class=\"vc_col-sm-12 wpb_column column_container vc_column_container col no-extra-padding inherit_tablet inherit_phone\"  data-padding-pos=\"all\" data-has-bg-color=\"false\" data-bg-color=\"\" data-bg-opacity=\"1\" data-animation=\"\" data-delay=\"0\" >\n\t\t<div class=\"vc_column-inner\" >\n\t\t\t<div class=\"wpb_wrapper\">\n\t\t\t\t\r\n<div class=\"wpb_text_column wpb_content_element\" >\r\n\t<div class=\"wpb_wrapper\">\r\n\t\t<h3>Principales conclusions<\/h3>\n<ul>\n<li>Les \u0153ufs de cor\u00e9gone collect\u00e9s aupr\u00e8s de femelles captur\u00e9es dans une rivi\u00e8re et incub\u00e9s ensuite dans une autre rivi\u00e8re ont donn\u00e9 naissance \u00e0 des larves de cor\u00e9gone dont les otolithes refl\u00e9taient la rivi\u00e8re o\u00f9 leur m\u00e8re avait \u00e9t\u00e9 captur\u00e9e, plut\u00f4t que l&#039;endroit o\u00f9 elles avaient \u00e9t\u00e9 incub\u00e9es.<\/li>\n<li>Les otolithes des larves de grand cor\u00e9gone peuvent \u00eatre domin\u00e9s par l&#039;influence maternelle bien apr\u00e8s la migration depuis le site d&#039;\u00e9closion jusqu&#039;au stade de d\u00e9rive p\u00e9lagique. En effet, les signatures otolithiques des larves de poisson ne commencent \u00e0 refl\u00e9ter le milieu d&#039;\u00e9levage qu&#039;apr\u00e8s la r\u00e9sorption compl\u00e8te du sac vitellin, ce qui, pour le grand cor\u00e9gone, prend environ 15 jours apr\u00e8s l&#039;\u00e9closion.<\/li>\n<\/ul>\n\t<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\n\t\t\t<\/div> \n\t\t<\/div>\n\t<\/div> \n<\/div><\/div>\r\n\t\t<div id=\"fws_69e1df9b5789b\"  data-column-margin=\"default\" data-midnight=\"dark\"  class=\"wpb_row vc_row-fluid vc_row\"  style=\"padding-top: 0px; padding-bottom: 0px; \"><div class=\"row-bg-wrap\" data-bg-animation=\"none\" data-bg-overlay=\"false\"><div class=\"inner-wrap\"><div class=\"row-bg viewport-desktop\"  style=\"\"><\/div><\/div><\/div><div class=\"row_col_wrap_12 col span_12 dark left\">\n\t<div  class=\"vc_col-sm-12 wpb_column column_container vc_column_container col no-extra-padding inherit_tablet inherit_phone\"  data-padding-pos=\"all\" data-has-bg-color=\"false\" data-bg-color=\"\" data-bg-opacity=\"1\" data-animation=\"\" data-delay=\"0\" >\n\t\t<div class=\"vc_column-inner\" >\n\t\t\t<div class=\"wpb_wrapper\">\n\t\t\t\t\r\n<div class=\"wpb_text_column wpb_content_element\" >\r\n\t<div class=\"wpb_wrapper\">\r\n\t\t<h3>R\u00e9sultats significatifs de la recherche sur le grand cor\u00e9gone<\/h3>\n<p>Cette recherche conclut que la microchimie des otolithes ne peut servir \u00e0 d\u00e9terminer l&#039;origine natale du grand cor\u00e9gone, car les otolithes refl\u00e8tent l&#039;influence maternelle plut\u00f4t que celle du lieu d&#039;incubation. Des recherches ant\u00e9rieures ont r\u00e9v\u00e9l\u00e9 des diff\u00e9rences dans la microchimie des otolithes chez des groupes d&#039;autres esp\u00e8ces de poissons des Grands Lacs incub\u00e9s dans des environnements diff\u00e9rents. Cependant, cette recherche sugg\u00e8re que ces diff\u00e9rences pourraient ne pas refl\u00e9ter des variations environnementales, mais plut\u00f4t des influences maternelles, ce qui met en garde contre l&#039;utilisation de la microchimie des otolithes pour d\u00e9limiter les populations de poissons des Grands Lacs.<\/p>\n\t<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\n\t\t\t<\/div> \n\t\t<\/div>\n\t<\/div> \n<\/div><\/div>\r\n\t\t<div id=\"fws_69e1df9b57a09\"  data-column-margin=\"default\" data-midnight=\"dark\"  class=\"wpb_row vc_row-fluid vc_row\"  style=\"padding-top: 0px; padding-bottom: 0px; \"><div class=\"row-bg-wrap\" data-bg-animation=\"none\" data-bg-overlay=\"false\"><div class=\"inner-wrap\"><div class=\"row-bg viewport-desktop\"  style=\"\"><\/div><\/div><\/div><div class=\"row_col_wrap_12 col span_12 dark left\">\n\t<div  class=\"vc_col-sm-6 wpb_column column_container vc_column_container col no-extra-padding inherit_tablet inherit_phone\"  data-padding-pos=\"all\" data-has-bg-color=\"false\" data-bg-color=\"\" data-bg-opacity=\"1\" data-animation=\"\" data-delay=\"0\" >\n\t\t<div class=\"vc_column-inner\" >\n\t\t\t<div class=\"wpb_wrapper\">\n\t\t\t\t\r\n<div class=\"wpb_text_column wpb_content_element\" >\r\n\t<div class=\"wpb_wrapper\">\r\n\t\t<h2>Apprendre encore plus<\/h2>\n<p>Si vous avez des questions, veuillez contacter le chercheur principal, le Dr Patrick Forsythe, \u00e0 <a href=\"mailto:forsythp@uwgb.edu\">forsythp@uwgb.edu<\/a>.<\/p>\n<p><strong>Clause de non-responsabilit\u00e9<\/strong><\/p>\n<p>Les notes de recherche comprennent les r\u00e9sultats des projets financ\u00e9s par le GLFT qui contribuent \u00e0 l\u2019ensemble des connaissances scientifiques sur la p\u00eache dans les Grands Lacs. Les conclusions des chercheurs et les r\u00e9sum\u00e9s des r\u00e9sultats des subventions ne constituent pas une approbation ou une position du GLFT et sont fournis pour mieux faire conna\u00eetre les r\u00e9sultats des projets et fournir des informations pertinentes aux chercheurs et aux gestionnaires des p\u00eaches. Les conclusions des chercheurs sont souvent pr\u00e9liminaires et n\u2019ont peut-\u00eatre pas \u00e9t\u00e9 \u00e9valu\u00e9es par des pairs.<\/p>\n\t<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\n\t\t\t<\/div> \n\t\t<\/div>\n\t<\/div> \n\n\t<div style=\" color: #2c475d;margin-top: 15px; \" class=\"vc_col-sm-6 drk-back-link wpb_column column_container vc_column_container col padding-3-percent inherit_tablet inherit_phone\" data-using-bg=\"true\" data-padding-pos=\"left-right\" data-has-bg-color=\"true\" data-bg-color=\"rgba(44,71,93,0.05)\" data-bg-opacity=\"1\" data-animation=\"\" data-delay=\"0\" >\n\t\t<div class=\"vc_column-inner\" ><div class=\"column-bg-overlay-wrap\" data-bg-animation=\"none\"><div class=\"column-bg-overlay\" style=\"opacity: 1; background-color: rgba(44,71,93,0.05);\"><\/div><\/div>\n\t\t\t<div class=\"wpb_wrapper\">\n\t\t\t\t<div class=\"divider-wrap\" data-alignment=\"default\"><div style=\"height: 25px;\" class=\"divider\"><\/div><\/div><h2 style=\"font-size: 30px;color: #2c475d;text-align: left;font-family:PT Sans;font-weight:400;font-style:normal\" class=\"vc_custom_heading\" >Lectures connexes<\/h2><div class=\"divider-wrap\" data-alignment=\"default\"><div style=\"height: 10px;\" class=\"divider\"><\/div><\/div><div class=\"nectar-fancy-ul\" data-list-icon=\"fa fa-search\" data-animation=\"false\" data-animation-delay=\"0\" data-color=\"extra-color-3\" data-spacing=\"10px\" data-alignment=\"left\"> \n<ul>\n<li><a href=\"https:\/\/www.glft.org\/fr\/recruitment-dynamics-of-lake-whitefish-and-cisco-in-the-upper-great-lakes\/\">Dynamique de recrutement du grand cor\u00e9gone et du cisco dans les Grands Lacs sup\u00e9rieurs<\/a><\/li>\n<li><a href=\"\/fr\/using-genomics-techniques-to-delineate-lake-michigan-whitefish-stocks\/\">Utilisation de techniques g\u00e9nomiques pour d\u00e9limiter les stocks de cor\u00e9gones du lac Michigan<\/a><\/li>\n<li><a href=\"https:\/\/www.glft.org\/fr\/exploring-disease-susceptibility-and-its-impact-on-lake-whitefish-recruitment\/\">\u00c9tude de la sensibilit\u00e9 aux maladies et de son impact sur le recrutement du cor\u00e9gone<\/a><\/li>\n<li><a href=\"https:\/\/www.ices.dk\/news-and-events\/news-archive\/news\/Pages\/EC_Brown.aspx\" target=\"_blank\" rel=\"noopener\">Pr\u00e8s de six d\u00e9cennies de tendances de recrutement pour le grand cor\u00e9gone et le cisco dans les Grands Lacs<\/a><\/li>\n<\/ul>\n <\/div><div class=\"divider-wrap\" data-alignment=\"default\"><div style=\"height: 10px;\" class=\"divider\"><\/div><\/div>\n\t\t\t<\/div> \n\t\t<\/div>\n\t<\/div> \n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Cette \u00e9dition de Notes de recherche met en lumi\u00e8re les recherches visant \u00e0 comprendre les origines natales du grand cor\u00e9gone de la baie Green et si elles pourraient aider les chercheurs \u00e0 d\u00e9limiter les stocks individuels.<\/p>","protected":false},"author":7,"featured_media":2173,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[4],"tags":[],"class_list":{"0":"post-2172","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-research-notes"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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