{"id":3795,"date":"2026-09-15T14:08:37","date_gmt":"2026-09-15T14:08:37","guid":{"rendered":"https:\/\/metamorphosis-project.org\/?p=3795"},"modified":"2026-09-22T00:18:54","modified_gmt":"2026-09-22T00:18:54","slug":"zwei-lebenszyklen-eine-art-der-alpenmolch-in-all-seinen-formen","status":"publish","type":"post","link":"https:\/\/metamorphosis-project.org\/de\/veroffentlichungen\/zwei-lebenszyklen-eine-art-der-alpenmolch-in-all-seinen-formen\/","title":{"rendered":"Zwei Lebenszyklen, eine Art: Der Alpenmolch in all seinen Erscheinungsformen"},"content":{"rendered":"<h4 class=\"wp-block-heading\">Warum gerade der Alpenmolch?<\/h4>\n\n\n\n<figure class=\"wp-block-image alignleft size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"543\" height=\"895\" src=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-153403.png\" alt=\"\" class=\"wp-image-3816\" style=\"aspect-ratio:0.60671221097241;width:311px;height:auto\" srcset=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-153403.png 543w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-153403-182x300.png 182w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-153403-7x12.png 7w\" sizes=\"auto, (max-width: 543px) 100vw, 543px\" \/><figcaption class=\"wp-element-caption\">Die verschiedenen Lebensstadien bei triphasischen und paedomorphen Individuen der Alpenmolch.<br>\u00a9 Morgane Fournier<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">Im Laufe seines Lebens durchl\u00e4uft der Alpenmolch, wie viele Amphibien, mehrere Entwicklungsstadien (vgl. <span style=\"color: #48c832\" class=\"stk-highlight\"><strong>dreiphasig<\/strong><\/span>): Er beginnt sein Leben als Ei, entwickelt sich dann zur Larve, zum Jungtier und schlie\u00dflich zum ausgewachsenen Tier. Diese verschiedenen Entwicklungsstadien gehen mit erheblichen morphologischen Ver\u00e4nderungen einher, insbesondere w\u00e4hrend der Metamorphose. Angetrieben durch Hormone f\u00fchrt diese Phase zu einer vollst\u00e4ndigen Umstrukturierung des Organismus: Bestimmte Organe und Gewebe wandeln sich um, damit der Molch von einer aquatischen Lebensweise zu einer \u00fcberwiegend terrestrischen \u00fcbergehen kann.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Allerdings folgen nicht alle Populationen des Alpenmolchs diesem Muster. Bei einigen Populationen, die vor allem in Italien und auf dem Balkan vorkommen, kann die Metamorphose vor ihrem vollst\u00e4ndigen Abschluss zum Stillstand kommen. Diese Individuen werden dann erwachsen und k\u00f6nnen sich fortpflanzen, behalten dabei jedoch bestimmte Merkmale ihrer Larvenform bei und bleiben im Wasser. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diese Strategie, die als <strong><span style=\"color: #4832c8\" class=\"stk-highlight\">Paedomorphose<\/span><\/strong>, ist optional und reversibel: Sollten die Umweltbedingungen ung\u00fcnstiger werden, k\u00f6nnen diese Individuen ihre Metamorphose fortsetzen und zu einer terrestrischen Lebensweise \u00fcbergehen. <strong><span style=\"color: #4832c8\" class=\"stk-highlight\">Fakultative P\u00e4domorphose<\/span><\/strong> kann somit als eine Form der Flexibilit\u00e4t im Lebenszyklus betrachtet werden, die es Molchen erm\u00f6glicht, g\u00fcnstige Bedingungen in der aquatischen Umwelt zu nutzen und gleichzeitig den Energieaufwand einer vollst\u00e4ndigen Metamorphose zu vermeiden, wenn diese nicht erforderlich ist. Es handelt sich um ein Beispiel f\u00fcr Variationen im Lebenszyklus innerhalb einer einzigen Art, mit anderen Worten,<strong> innerartliche Variation<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wir wollten verstehen, wie sich dieser Unterschied im Lebenszyklus auf die Morphologie der erwachsenen Tiere auswirken k\u00f6nnte, insbesondere auf die des K\u00f6rpers und des Kausystems (die Knochen des Kopfes), das w\u00e4hrend der Metamorphose ebenfalls erhebliche Ver\u00e4nderungen durchl\u00e4uft.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zu diesem Zweck haben wir Exemplare untersucht, die in europ\u00e4ischen Museumssammlungen aufbewahrt werden. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"550\" src=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-155323-1024x550.png\" alt=\"\" class=\"wp-image-3819\" srcset=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-155323-1024x550.png 1024w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-155323-300x161.png 300w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-155323-768x413.png 768w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-155323-18x10.png 18w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-155323.png 1531w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">R\u00e4umliche Verbreitung des Alpenmolchs in Europa (grau) und die f\u00fcr die Studie verwendeten Proben.<br>Fournier et al. 2026. ICB<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Die K\u00f6rpermorphologie wurde untersucht <a href=\"https:\/\/metamorphosis-project.org\/de\/datensatze\/how-to-collect-geometric-morphometric-data-from-ct-scans\/\" target=\"_blank\" rel=\"noopener\">unter Verwendung von Messwerten<\/a> aus verschiedenen K\u00f6rperteilen entnommen. Bei den Sch\u00e4delknochen, die sich viel schwerer direkt untersuchen lassen, wurden die Pr\u00e4parate<a href=\"https:\/\/metamorphosis-project.org\/de\/datensatze\/wie-bereiten-wir-proben-fur-das-scannen-vor\/\" target=\"_blank\" rel=\"noopener\"> R\u00f6ntgenaufnahme<\/a> um dreidimensionale Modelle der Knochen zu erstellen. Anschlie\u00dfend wandten wir eine Methode an, die als <a href=\"https:\/\/metamorphosis-project.org\/de\/datensatze\/how-to-collect-geometric-morphometric-data-from-ct-scans\/\" target=\"_blank\" rel=\"noopener\">geometrische Morphometrie<\/a>, was einen pr\u00e4zisen Vergleich der Knochenformen erm\u00f6glicht.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Was haben wir herausgefunden?<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"688\" src=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-154008-1024x688.png\" alt=\"\" class=\"wp-image-3820\" srcset=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-154008-1024x688.png 1024w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-154008-300x202.png 300w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-154008-768x516.png 768w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-154008-18x12.png 18w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-15-154008.png 1430w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Illustrierte Zusammenfassung der Unterschiede zwischen Paedomorphen und dreiphasigen Organismen.<br>\u00a9 Morgane Fournier<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Unsere Ergebnisse zeigen, dass <span style=\"color: #4832c8\" class=\"stk-highlight\"><strong>paedomorphe Individuen<\/strong><\/span> sind <strong>kleiner<\/strong> und weisen morphologische Merkmale auf <strong>an das Leben im Wasser angepasst<\/strong>. So sind beispielsweise ihre Mittelhandknochen (bestimmte Knochen in den Vordergliedma\u00dfen) relativ k\u00fcrzer, was m\u00f6glicherweise mit einer anderen Nutzung ihrer Gliedma\u00dfen beim Fortbewegen im Wasser zusammenh\u00e4ngt. Auch die Knochen des Kopfes weisen eine Morphologie auf, die besonders gut geeignet ist f\u00fcr <strong>Saugkraft<\/strong>, eine \u00e4u\u00dferst effiziente Art der Nahrungsaufnahme in einer aquatischen Umgebung.<\/p>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-3c71cea\" data-block-id=\"3c71cea\"><style>.stk-3c71cea .stk-block-text__text{font-size:18px !important;}@media screen and (max-width:999px){.stk-3c71cea .stk-block-text__text{font-size:18px !important;}}<\/style><p class=\"stk-block-text__text has-text-align-right\"><em>Klick <a href=\"https:\/\/metamorphosis-project.org\/fr\/editions-2\/lage-adulte-nest-il-quune-illusion-limpact-de-la-taille-et-de-lontogenese-sur-la-cinematique-de-lalimentation-par-succion-chez-laxolotl-ambystoma-mexicanum\/\" target=\"_blank\" rel=\"noopener\">hier<\/a> , wenn Sie mehr \u00fcber die Saugern\u00e4hrung bei Salamandern erfahren m\u00f6chten.<\/em><\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Au\u00dferdem wollten wir herausfinden, ob die P\u00e4domorphose die Art und Weise beeinflusst, wie sich verschiedene Knochen im Verh\u00e4ltnis zueinander entwickeln. Manche Knochen k\u00f6nnen sich relativ unabh\u00e4ngig voneinander entwickeln; in solchen F\u00e4llen spricht man davon, dass sie eher <strong>modular<\/strong>. Umgekehrt gilt: Wenn Ver\u00e4nderungen in der Form eines Knochens eng mit denen anderer Knochen zusammenh\u00e4ngen, ist das System eher<strong> integriert<\/strong>. Unsere Ergebnisse zeigen, dass trotz morphologischer Unterschiede die P\u00e4domorphose <strong>beeinflusst diese Organisation der Knochenentwicklung beim Alpenmolch nicht<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Im Gegensatz dazu, <span style=\"color: #4832c8\" class=\"stk-highlight\"><strong>paedomorphe<\/strong><\/span> weisen eine <strong>gr\u00f6\u00dfere morphologische Vielfalt auf<\/strong> (Disparit\u00e4tswerte). Diese Vielfalt k\u00f6nnte damit zusammenh\u00e4ngen, dass die Metamorphose <strong>nicht bei allen Individuen genau zum gleichen Zeitpunkt zum Stillstand kommt<\/strong>. Einige haben daher einen st\u00e4rkeren Umbau durchlaufen als andere, was zu gr\u00f6\u00dferen Abweichungen in der Form ihrer Knochen f\u00fchrt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diese Erkenntnisse sind vor dem aktuellen Hintergrund besonders interessant, da paedomorphe Populationen auf dauerhafte aquatische Lebensr\u00e4ume angewiesen sind, in denen es relativ wenige Raubtiere gibt. Sie sind daher in hohem Ma\u00dfe <strong>empfindlich gegen\u00fcber Umwelteinfl\u00fcssen<\/strong>, wie beispielsweise die Einf\u00fchrung von Fischarten, die Verschlechterung des Lebensraums, hydrologische Ver\u00e4nderungen und der Klimawandel. Ein besseres Verst\u00e4ndnis der morphologischen Folgen verschiedener Lebenszyklusstrategien liefert somit nicht nur Erkenntnisse \u00fcber die Einschr\u00e4nkungen, denen diese Populationen ausgesetzt sind, sondern auch \u00fcber ihre F\u00e4higkeit, mit Ver\u00e4nderungen in ihrer Umwelt umzugehen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-3fe041c\" data-block-id=\"3fe041c\"><style>.stk-3fe041c .stk-block-text__text{font-size:20px !important;}@media screen and (max-width:999px){.stk-3fe041c .stk-block-text__text{font-size:20px !important;}}<\/style><p class=\"stk-block-text__text has-text-align-center\"><strong>Wenn Sie weitere Informationen w\u00fcnschen, finden Sie den Artikel <a href=\"https:\/\/academic.oup.com\/icb\/advance-article\/doi\/10.1093\/icb\/icag164\/8792953\" target=\"_blank\" rel=\"noopener\">hier<\/a>!<\/strong><\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>During its life, the Alpine newt, like many amphibians, goes through several stages. These different stages are associated with significant morphological changes. 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