{"id":1852,"date":"2023-05-01T12:08:33","date_gmt":"2023-05-01T16:08:33","guid":{"rendered":"https:\/\/www.glft.org\/?p=1852"},"modified":"2023-05-01T12:08:33","modified_gmt":"2023-05-01T16:08:33","slug":"glft-funded-researchers-describe-the-diets-of-predatory-fish","status":"publish","type":"post","link":"https:\/\/www.glft.org\/fr\/glft-funded-researchers-describe-the-diets-of-predatory-fish\/","title":{"rendered":"Des chercheurs financ\u00e9s par le GLFT d\u00e9crivent le r\u00e9gime alimentaire des poissons pr\u00e9dateurs"},"content":{"rendered":"<div id=\"fws_6a0054d4b56da\"  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_1682344756108\" >\r\n\t<div class=\"wpb_wrapper\">\r\n\t\t<h2>Le gaspareau \u00e9tant presque absent du menu du lac Huron, les pr\u00e9dateurs se tournent vers d\u2019autres esp\u00e8ces<\/h2>\n<p>Les lacs Michigan et Huron abritent des poissons pr\u00e9dateurs importants pour les p\u00eacheurs et les \u00e9conomies locales, notamment plusieurs esp\u00e8ces de truites et de saumons. L&#039;\u00e9quilibre entre la consommation des pr\u00e9dateurs et l&#039;approvisionnement en proies est essentiel pour soutenir une p\u00eache saine et durable de ces esp\u00e8ces, et les gestionnaires s&#039;efforcent d&#039;aider les p\u00eacheries \u00e0 atteindre cet \u00e9quilibre dans l&#039;\u00e9cosyst\u00e8me en constante \u00e9volution des Grands Lacs. \u00c0 mesure que l&#039;abondance de certaines esp\u00e8ces proies diminue et que d&#039;autres augmentent, le r\u00e9gime alimentaire des pr\u00e9dateurs peut changer, ce qui entra\u00eene des donn\u00e9es obsol\u00e8tes utilis\u00e9es dans les mod\u00e8les qui \u00e9clairent les repeuplements et d&#039;autres d\u00e9cisions de gestion.<\/p>\n<p>Ce projet de recherche a quantifi\u00e9 le r\u00e9gime alimentaire de plusieurs esp\u00e8ces de pr\u00e9dateurs dans les lacs Michigan et Huron, notamment en examinant les variations spatiales et temporelles au sein des esp\u00e8ces et en offrant de nouvelles perspectives sur les r\u00e9seaux trophiques aquatiques dans les Grands Lacs. Une \u00e9quipe de chercheurs de l&#039;Universit\u00e9 d&#039;\u00c9tat du Michigan, dirig\u00e9e par le Dr Brian Roth, s&#039;est associ\u00e9e au Fish and Wildlife Service des \u00c9tats-Unis, au Service g\u00e9ologique des \u00c9tats-Unis, \u00e0 plusieurs tribus et au D\u00e9partement des ressources naturelles du Michigan pour collecter des milliers d&#039;estomacs de poissons pr\u00e9dateurs et analyser leur contenu, fournissant ainsi de nouvelles donn\u00e9es sur les pr\u00e9f\u00e9rences de ces poissons en mati\u00e8re de proies et sur la fa\u00e7on dont elles varient dans l&#039;espace et le temps.<\/p>\n\t<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n<div id=\"fws_6a0054d4b5bdb\" data-midnight=\"\" data-column-margin=\"default\" class=\"wpb_row vc_row-fluid vc_row inner_row\"  style=\"\"><div class=\"row-bg-wrap\"> <div class=\"row-bg\" ><\/div> <\/div><div class=\"row_col_wrap_12_inner col span_12  left\">\n\t<div  class=\"vc_col-sm-6 wpb_column column_container vc_column_container col child_column 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<div class=\"wpb_wrapper\">\n\t\t\t<div class=\"nectar_image_with_hotspots\" data-stlye=\"color_pulse\" data-hotspot-icon=\"plus_sign\" data-size=\"medium\" data-color=\"extra-color-3\" data-tooltip-func=\"hover\" data-tooltip_shadow=\"none\" data-animation=\"true\"><img loading=\"lazy\" decoding=\"async\" width=\"3750\" height=\"3182\" src=\"https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-mi-rainbowtrout-2019-nocircles.png\" class=\"attachment-full size-full\" alt=\"\" srcset=\"https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-mi-rainbowtrout-2019-nocircles.png 3750w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-mi-rainbowtrout-2019-nocircles-300x255.png 300w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-mi-rainbowtrout-2019-nocircles-1024x869.png 1024w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-mi-rainbowtrout-2019-nocircles-768x652.png 768w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-mi-rainbowtrout-2019-nocircles-1536x1303.png 1536w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-mi-rainbowtrout-2019-nocircles-2048x1738.png 2048w\" sizes=\"auto, (max-width: 3750px) 100vw, 3750px\" \/><div class=\"nectar_hotspot_wrap\" style=\"top: 55.0182%; left: 44.3772%;\"><div class=\"nectar_hotspot\"><span><\/span><\/div><div class=\"nttip\" data-tooltip-position=\"top\"><div class=\"inner\">90% Gaspareau<\/div><\/div><\/div><div class=\"nectar_hotspot_wrap\" style=\"top: 52.4033%; left: 63.5401%;\"><div class=\"nectar_hotspot\"><span><\/span><\/div><div class=\"nttip\" data-tooltip-position=\"top\"><div class=\"inner\">9% Invert\u00e9br\u00e9s<\/div><\/div><\/div><div class=\"nectar_hotspot_wrap\" style=\"top: 47.8865%; left: 32.476%;\"><div class=\"nectar_hotspot\"><span><\/span><\/div><div class=\"nttip\" data-tooltip-position=\"top\"><div class=\"inner\">1% autres poissons<\/div><\/div><\/div><\/div>\n\t\t<\/div> \n\t<\/div>\n\t<\/div> \n\n\t<div  class=\"vc_col-sm-6 wpb_column column_container vc_column_container col child_column 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<div class=\"wpb_wrapper\">\n\t\t\t<div class=\"nectar_image_with_hotspots\" data-stlye=\"color_pulse\" data-hotspot-icon=\"plus_sign\" data-size=\"medium\" data-color=\"extra-color-3\" data-tooltip-func=\"hover\" data-tooltip_shadow=\"none\" data-animation=\"\"><img loading=\"lazy\" decoding=\"async\" width=\"3750\" height=\"3182\" src=\"https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-huron-rainbow-trout-2019-nocircles.png\" class=\"attachment-full size-full\" alt=\"\" srcset=\"https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-huron-rainbow-trout-2019-nocircles.png 3750w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-huron-rainbow-trout-2019-nocircles-300x255.png 300w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-huron-rainbow-trout-2019-nocircles-1024x869.png 1024w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-huron-rainbow-trout-2019-nocircles-768x652.png 768w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-huron-rainbow-trout-2019-nocircles-1536x1303.png 1536w, https:\/\/www.glft.org\/wp-content\/uploads\/2023\/04\/April23RN_lake-huron-rainbow-trout-2019-nocircles-2048x1738.png 2048w\" sizes=\"auto, (max-width: 3750px) 100vw, 3750px\" \/><div class=\"nectar_hotspot_wrap\" style=\"top: 47.6488%; left: 61.1195%;\"><div class=\"nectar_hotspot\"><span><\/span><\/div><div class=\"nttip\" data-tooltip-position=\"top\"><div class=\"inner\">65% Invert\u00e9br\u00e9s<\/div><\/div><\/div><div class=\"nectar_hotspot_wrap\" style=\"top: 51.2147%; left: 31.064%;\"><div class=\"nectar_hotspot\"><span><\/span><\/div><div class=\"nttip\" data-tooltip-position=\"top\"><div class=\"inner\">20% \u00c9perlan<\/div><\/div><\/div><div class=\"nectar_hotspot_wrap\" style=\"top: 58.8218%; left: 43.7721%;\"><div class=\"nectar_hotspot\"><span><\/span><\/div><div class=\"nttip\" data-tooltip-position=\"top\"><div class=\"inner\">10% Cor\u00e9gonines<\/div><\/div><\/div><div class=\"nectar_hotspot_wrap\" style=\"top: 60.0104%; left: 61.3212%;\"><div class=\"nectar_hotspot\"><span><\/span><\/div><div class=\"nttip\" data-tooltip-position=\"top\"><div class=\"inner\">5% autres poissons<\/div><\/div><\/div><\/div>\n\t\t<\/div> \n\t<\/div>\n\t<\/div> \n<\/div><\/div>\r\n<div class=\"wpb_text_column wpb_content_element  vc_custom_1682350001204\" >\r\n\t<div class=\"wpb_wrapper\">\r\n\t\t<h3>Principales conclusions<\/h3>\n<ul>\n<li>Les r\u00e9gimes alimentaires des poissons pr\u00e9dateurs du lac Huron \u00e9taient plus diversifi\u00e9s que ceux du lac Michigan, probablement en raison de l\u2019effondrement de la population de gaspareaux dans le lac Huron en 2003. Bien que le gaspareau constitue toujours une grande partie du r\u00e9gime alimentaire du saumon quinnat, des pr\u00e9dateurs plus g\u00e9n\u00e9ralistes, comme le touladi et le dor\u00e9 jaune, ont profit\u00e9 de la population croissante de gobies \u00e0 taches noires dans le lac Huron ainsi que d\u2019autres sources de proies.<\/li>\n<li>Le r\u00e9gime alimentaire des pr\u00e9dateurs du lac Michigan \u00e9tait domin\u00e9 par le gaspareau, et la plupart des pr\u00e9dateurs se nourrissent de gaspareaux de la m\u00eame taille.<\/li>\n<li>Les r\u00e9gimes alimentaires des truites de lac et des truites arc-en-ciel ont montr\u00e9 des variations mensuelles importantes qui ont suivi la m\u00eame tendance au fil des ann\u00e9es de l\u2019\u00e9tude. Les r\u00e9gimes alimentaires des truites de lac ont \u00e9galement vari\u00e9 de mani\u00e8re significative selon le district statistique (une subdivision couramment utilis\u00e9e d\u2019un lac). Les r\u00e9gimes alimentaires des autres esp\u00e8ces n\u2019ont pas montr\u00e9 cette variation spatiale.<\/li>\n<\/ul>\n<h3>R\u00e9sultats significatifs pour la recherche<\/h3>\n<p>Cette recherche financ\u00e9e par le GLFT a mis \u00e0 jour des informations importantes sur les r\u00e9gimes alimentaires des pr\u00e9dateurs dans deux des Grands Lacs. Une comparaison des r\u00e9gimes alimentaires du lac Michigan et du lac Huron illustre le r\u00f4le important du gaspareau dans le premier, mais sugg\u00e8re que la plupart des esp\u00e8ces de pr\u00e9dateurs peuvent se tourner vers d&#039;autres esp\u00e8ces de proies en l&#039;absence de gaspareau. La d\u00e9pendance continue du saumon quinnat au gaspareau indique que ce pr\u00e9dateur majeur pourrait \u00eatre moins r\u00e9silient aux changements \u00e9cologiques que d&#039;autres piscivores des Grands Lacs. Les r\u00e9sultats de cette recherche ont \u00e9t\u00e9 utilis\u00e9s dans des mod\u00e8les qui calculent les \u00e9quilibres pr\u00e9dateurs-proies, red\u00e9finissent les mod\u00e8les de populations de touladis dans les lacs et aident \u00e0 la prise de d\u00e9cision en mati\u00e8re d&#039;empoissonnement.<\/p>\n\t<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n\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>Pour toute question, veuillez contacter le chercheur principal, Brian Roth, PhD, au <a href=\"mailto:rothbri@msu.edu\">rothbri@msu.edu<\/a>.<\/p>\n<h2>Clause de non-responsabilit\u00e9<\/h2>\n<p><em>Notes de recherche <\/em>comprend les r\u00e9sultats des projets financ\u00e9s par le GLFT qui contribuent \u00e0 l&#039;ensemble 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.<\/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>","protected":false},"excerpt":{"rendered":"<p>Cette \u00e9dition de Notes de recherche met en lumi\u00e8re les contributions de recherche du Dr Brian Roth et de son \u00e9quipe sur les r\u00e9gimes alimentaires des poissons pr\u00e9dateurs qui ont \u00e9t\u00e9 soutenues par GLFT.<\/p>","protected":false},"author":3,"featured_media":1857,"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-1852","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 v27.5 - 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