{"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\/de\/glft-funded-researchers-describe-the-diets-of-predatory-fish\/","title":{"rendered":"GLFT-gef\u00f6rderte Forscher beschreiben die Ern\u00e4hrung von Raubfischen"},"content":{"rendered":"<div id=\"fws_69e1d037d5d68\"  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>Da Maifisch im Huronsee gr\u00f6\u00dftenteils nicht mehr auf dem Speiseplan steht, weichen die Raubtiere auf andere Arten aus<\/h2>\n<p>Die Seen Michigan und Huron sind die Heimat von Raubfischen, die f\u00fcr Angler und die lokale Wirtschaft wichtig sind, darunter mehrere Forellen- und Lachsarten. Das Gleichgewicht zwischen Raubfischkonsum und Beuteangebot ist f\u00fcr die Unterst\u00fctzung einer gesunden und nachhaltigen Fischerei auf diese Arten von zentraler Bedeutung, und die Manager arbeiten daran, den Fischereien dabei zu helfen, dieses Gleichgewicht im sich st\u00e4ndig ver\u00e4ndernden \u00d6kosystem der Gro\u00dfen Seen zu erreichen. Wenn die H\u00e4ufigkeit einiger Beutearten abnimmt und andere zunimmt, kann sich die Ern\u00e4hrung der Raubtiere \u00e4ndern, was zu veralteten Daten in den Modellen f\u00fchrt, die Besatz- und andere Managemententscheidungen beeinflussen.<\/p>\n<p>Dieses Forschungsprojekt quantifizierte die Ern\u00e4hrung mehrerer Raubfischarten in den Seen Michigan und Huron, untersuchte r\u00e4umliche und zeitliche Variationen innerhalb der Arten und gab neue Einblicke in die aquatischen Nahrungsnetze in den Gro\u00dfen Seen. Ein Forscherteam der Michigan State University unter der Leitung von Dr. Brian Roth sammelte in Zusammenarbeit mit dem US Fish and Wildlife Service, dem US Geological Service, mehreren St\u00e4mmen und dem Michigan Department of Natural Resources Tausende von Raubfischm\u00e4gen und analysierte deren Inhalt. So konnten neue Daten \u00fcber die Beutepr\u00e4ferenzen dieser Fische und deren r\u00e4umliche und zeitliche Variation gewonnen werden.<\/p>\n\t<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n<div id=\"fws_69e1d037d62a1\" 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% Alewife<\/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% Wirbellose Tiere<\/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% andere Fische<\/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% Wirbellose Tiere<\/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% Stint<\/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% Coregoninen<\/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% andere Fische<\/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>Wichtige Erkenntnisse<\/h3>\n<ul>\n<li>Die Nahrung der Raubfische im Huronsee war vielf\u00e4ltiger als im Michigansee, was wahrscheinlich auf den Zusammenbruch der Maifischpopulation im Huronsee im Jahr 2003 zur\u00fcckzuf\u00fchren ist. W\u00e4hrend Maifische noch immer einen gro\u00dfen Teil der Nahrung der K\u00f6nigslachse ausmachen, haben generalistischere Raubfische wie Seeforellen und Glasaugenbarsche die zunehmende Population der Schwarzmundgrundel im Huronsee sowie andere Beutequellen ausgenutzt.<\/li>\n<li>Die Nahrung der Raubtiere im Michigansee wurde vor allem von Maifischen bestimmt, und die meisten Raubtiere ern\u00e4hren sich von Maifischen gleicher Gr\u00f6\u00dfe.<\/li>\n<li>Die Ern\u00e4hrung der Seeforellen und Steelhead-Forellen wies von Monat zu Monat erhebliche Schwankungen auf, die \u00fcber die Jahre der Studie hinweg das gleiche Muster aufwiesen. Die Ern\u00e4hrung der Seeforellen variierte auch je nach statistischem Bezirk (eine h\u00e4ufig verwendete Unterteilung eines Sees) erheblich. Die Ern\u00e4hrung anderer Arten wies diese r\u00e4umlichen Schwankungen nicht auf.<\/li>\n<\/ul>\n<h3>Wichtige Ergebnisse f\u00fcr die Forschung<\/h3>\n<p>Diese von der GLFT unterst\u00fctzte Forschung aktualisierte wichtige Informationen \u00fcber die Ern\u00e4hrung von Raubtieren in zwei der Gro\u00dfen Seen. Ein Vergleich der Ern\u00e4hrungsgewohnheiten im Michigansee und im Huronsee verdeutlicht die bedeutende Rolle der Maifische im Michigansee, l\u00e4sst aber vermuten, dass die meisten Raubtierarten in Abwesenheit der Maifische auf andere Beutearten umsteigen k\u00f6nnen. Die anhaltende Abh\u00e4ngigkeit des K\u00f6nigslachses von Maifischen deutet darauf hin, dass dieser gro\u00dfe Raubfisch weniger widerstandsf\u00e4hig gegen\u00fcber \u00f6kologischen Ver\u00e4nderungen ist als andere Fischfresser in den Gro\u00dfen Seen. Die Ergebnisse dieser Forschung wurden in Modellen verwendet, die das Gleichgewicht zwischen Raubtieren und Beutetieren berechnen, Modelle der Seeforellenpopulationen in den Seen neu definieren und bei der Entscheidungsfindung hinsichtlich der Besatzma\u00dfnahmen helfen.<\/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>Mehr erfahren<\/h2>\n<p>Bei Fragen wenden Sie sich bitte an den leitenden Forscher, Dr. Brian Roth, unter <a href=\"mailto:rothbri@msu.edu\">rothbri@msu.edu<\/a>.<\/p>\n<h2>Haftungsausschluss<\/h2>\n<p><em>Forschungsnotizen <\/em>enth\u00e4lt die Ergebnisse von GLFT-finanzierten Projekten, die zum wissenschaftlichen Wissen \u00fcber die Fischerei in den Gro\u00dfen Seen beitragen. Die Forschungsergebnisse und Zusammenfassungen der F\u00f6rderergebnisse stellen keine Billigung oder Stellungnahme der GLFT dar und werden bereitgestellt, um das Bewusstsein f\u00fcr Projektergebnisse zu sch\u00e4rfen und Forschern und Fischereimanagern relevante Informationen bereitzustellen.<\/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>Diese Ausgabe der Research Notes hebt die von der GLFT unterst\u00fctzten Forschungsbeitr\u00e4ge von Dr. Brian Roth und seinem Team zur Ern\u00e4hrung von Raubfischen hervor.<\/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 v27.4 - 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