{"id":3906,"date":"2026-09-30T07:20:55","date_gmt":"2026-09-30T07:20:55","guid":{"rendered":"https:\/\/metamorphosis-project.org\/?p=3906"},"modified":"2026-10-20T19:11:41","modified_gmt":"2026-10-20T19:11:41","slug":"larves-et-metamorphes-du-triton-strie-iberique-a-chacun-ses-atouts-malgre-un-changement-de-tete","status":"publish","type":"post","link":"https:\/\/metamorphosis-project.org\/fr\/editions-2\/larves-et-metamorphes-du-triton-strie-iberique-a-chacun-ses-atouts-malgre-un-changement-de-tete\/","title":{"rendered":"Larves et m\u00e9tamorphes du triton stri\u00e9 ib\u00e9rique : chacun a ses propres atouts, malgr\u00e9 un changement radical de t\u00eate"},"content":{"rendered":"<p class=\"wp-block-paragraph\">C'est avec grand plaisir que nous vous pr\u00e9sentons les principales conclusions de notre \u00e9tude, publi\u00e9e dans <em>Biology Open<\/em>, dans lequel nous avons \u00e9tudi\u00e9 <a href=\"https:\/\/journals.biologists.com\/bio\/article\/doi\/10.1242\/bio.062752\/372874\/The-impact-of-metamorphosis-and-size-on-the\">the impact of metamorphosis and size on the aquatic feeding kinematics of the Iberian ribbed newt (<em>Pleurodeles waltl<\/em> Michahelles, 1830).<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>On n'a rien sans rien : les avantages de la m\u00e9tamorphose pourraient bien l'emporter sur ses inconv\u00e9nients !<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsqu'une larve de salamandre subit sa m\u00e9tamorphose pour atteindre son stade adulte, ce processus entra\u00eene un co\u00fbt m\u00e9tabolique \u00e9lev\u00e9. Elle peut perdre du poids, avoir du mal \u00e0 se nourrir et devenir plus faible et plus vuln\u00e9rable face aux pr\u00e9dateurs. Dans le pire des cas, elle peut ne pas survivre. \u00c0 premi\u00e8re vue, il est donc difficile de comprendre pourquoi un processus aussi co\u00fbteux a pu \u00e9voluer et se maintenir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pourtant, la m\u00e9tamorphose est loin d'\u00eatre l'apanage des amphibiens. Elle est tr\u00e8s r\u00e9pandue dans le r\u00e8gne animal : plus de 80 % des insectes et plus de la moiti\u00e9 des vert\u00e9br\u00e9s subissent une m\u00e9tamorphose. Cela sugg\u00e8re donc que les avantages de la m\u00e9tamorphose pourraient l'emporter sur ses inconv\u00e9nients.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L'une des principales explications est fournie par <strong><span style=\"color: #0f0e17\" class=\"stk-highlight\">l'hypoth\u00e8se du d\u00e9couplage adaptatif<\/span><\/strong>. Cette th\u00e9orie sugg\u00e8re que la m\u00e9tamorphose rompt le lien entre les ph\u00e9notypes larvaires et adultes. Cela peut pr\u00e9senter deux avantages principaux. Premi\u00e8rement, chaque stade peut se sp\u00e9cialiser dans des ressources diff\u00e9rentes (nourriture, environnement), ce qui r\u00e9duit la concurrence entre les larves et les adultes. Deuxi\u00e8mement, chaque stade peut \u00eatre mieux adapt\u00e9 aux pressions s\u00e9lectives sp\u00e9cifiques auxquelles il est confront\u00e9. Ensemble, ces avantages peuvent am\u00e9liorer la survie tout au long du cycle de vie.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Le triton ib\u00e9rique \u00e0 c\u00f4tes et son cycle de vie biphasique inhabituel<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Si l\u2019hypoth\u00e8se du d\u00e9couplage adaptatif se v\u00e9rifie, nous devrions \u00e9galement observer des diff\u00e9rences dans le fonctionnement des organes associ\u00e9s aux parties du corps qui subissent une transformation au cours de la m\u00e9tamorphose. Cela appara\u00eet particuli\u00e8rement clairement lorsque la m\u00e9tamorphose s\u2019accompagne d\u2019un passage d\u2019un milieu aquatique \u00e0 un milieu terrestre, comme chez la plupart des salamandres biphasiques. En effet, la m\u00e9tamorphose s\u2019accompagne de changements morphologiques majeurs li\u00e9s \u00e0 ce changement de mode de vie. Les exemples les plus frappants sont les syst\u00e8mes locomoteur et alimentaire. Les larves se d\u00e9placent en nageant et capturent leurs proies par succion, tandis que les individus m\u00e9tamorphos\u00e9s peuvent marcher sur terre et utiliser la pr\u00e9hension linguale (voir l'exemple de la pr\u00e9hension linguale <a href=\"https:\/\/metamorphosis-project.org\/fr\/videos\/salamandre-gluante-du-nord-plethodon-glutinosus-adulte-se-nourrissant\/\">ici<\/a>).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span style=\"color: #0f0e17\" class=\"stk-highlight\">Mais que se passe-t-il lorsque la m\u00e9tamorphose n'entra\u00eene pas de changement majeur dans le mode de vie ?<\/span><span style=\"color: #ff6900\" class=\"stk-highlight\"> <\/span><\/strong>Le d\u00e9couplage fonctionnel existe-t-il encore ? C'est la question \u00e0 laquelle nous avons cherch\u00e9 \u00e0 r\u00e9pondre en \u00e9tudiant la cin\u00e9matique de l'alimentation chez le triton stri\u00e9 ib\u00e9rique, une salamandre originaire du centre et du sud de la p\u00e9ninsule ib\u00e9rique ainsi que du nord du Maroc. Cette esp\u00e8ce biphasique poss\u00e8de la capacit\u00e9 inhabituelle de rester aquatique tout au long de sa vie lorsque les \u00e9tangs sont permanents. Par cons\u00e9quent, bien que les larves et les m\u00e9tamorphes pr\u00e9sentent des morphologies distinctes, ils partagent le m\u00eame environnement, ce qui signifie qu\u2019ils sont confront\u00e9s \u00e0 des contraintes \u00e9cologiques similaires, et ils continuent \u00e9galement \u00e0 recourir \u00e0 l\u2019alimentation par succion pour capturer leurs proies (voir la vid\u00e9o ci-dessous).<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Triton ib\u00e9rique \u00e0 c\u00f4tes, se nourrissant par succion\" width=\"1290\" height=\"726\" src=\"https:\/\/www.youtube.com\/embed\/4dMar8CAXSM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">M\u00eame alimentation, d\u00e9bit diff\u00e9rent : une diff\u00e9rence subtile entre les larves et les adultes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L'alimentation par aspiration repose principalement sur l'expansion rapide de la cavit\u00e9 buccale, provoqu\u00e9e par l'ouverture de la bouche et l'abaissement quasi simultan\u00e9 de l'os hyo\u00efde. Ensemble, ces mouvements cr\u00e9ent une pression n\u00e9gative \u00e0 l'int\u00e9rieur de la bouche, g\u00e9n\u00e9rant un flux qui aspire l'eau et les proies. Les m\u00e2choires se referment ensuite pour retenir la proie, puis l'os hyo\u00efde se soul\u00e8ve, ce qui expulse l'exc\u00e8s d'eau avant la d\u00e9glutition.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bien que les larves et les m\u00e9tamorphes utilisent le m\u00eame m\u00e9canisme alimentaire de base, il existe une diff\u00e9rence subtile concernant l'expulsion de l'eau. Chez les larves, l'eau p\u00e9n\u00e8tre par la bouche et ressort par les fentes branchiales situ\u00e9es \u00e0 l'arri\u00e8re de la t\u00eate. Cela cr\u00e9e un <strong><span style=\"color: #0f0e17\" class=\"stk-highlight\">syst\u00e8me d'\u00e9coulement unidirectionnel<\/span><\/strong>, l'eau s'\u00e9coulant dans un seul sens \u00e0 travers la t\u00eate. Chez les individus m\u00e9tamorphos\u00e9s, les fentes branchiales ont \u00e9t\u00e9 r\u00e9sorb\u00e9es au cours de la m\u00e9tamorphose. L'eau doit donc \u00eatre expuls\u00e9e par la bouche, ce qui inverse le sens du flux. Comme l'eau entre et sort par la bouche, on parle alors d'un <strong><span style=\"color: #0f0e17\" class=\"stk-highlight\">syst\u00e8me \u00e0 flux bidirectionnel<\/span><\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"390\" src=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_pleurodeles-edited-1024x390.png\" alt=\"\" class=\"wp-image-3908\" srcset=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_pleurodeles-edited-1024x390.png 1024w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_pleurodeles-edited-300x114.png 300w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_pleurodeles-edited-768x293.png 768w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_pleurodeles-edited-1536x585.png 1536w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_pleurodeles-edited-2048x781.png 2048w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_pleurodeles-edited-18x7.png 18w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Notre m\u00e9thode statistique pour tester l'hypoth\u00e8se<\/strong><\/h3>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\" style=\"grid-template-columns:32% auto\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"315\" height=\"900\" src=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/method_illustration-1.png\" alt=\"\" class=\"wp-image-3910 size-full\" srcset=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/method_illustration-1.png 315w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/method_illustration-1-105x300.png 105w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/method_illustration-1-4x12.png 4w\" sizes=\"auto, (max-width: 315px) 100vw, 315px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\">Malgr\u00e9 tout, on ne savait toujours pas si les larves et les m\u00e9tamorphes pr\u00e9sentaient r\u00e9ellement des diff\u00e9rences dans la cin\u00e9matique de leur alimentation par succion. De plus, nous souhaitions savoir si ces diff\u00e9rences potentielles pouvaient s'expliquer simplement par la taille corporelle. Pour r\u00e9pondre \u00e0 ces questions, nous avons r\u00e9alis\u00e9 des enregistrements vid\u00e9o \u00e0 haute vitesse de 9 larves et de 10 tritons ib\u00e9riques \u00e0 c\u00f4tes m\u00e9tamorphos\u00e9s, de tailles croissantes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c0 partir de ces vid\u00e9os, nous avons mesur\u00e9 les param\u00e8tres d'expansion buccale, ainsi que la dur\u00e9e des mouvements de la bouche et de l'os hyo\u00efde pendant l'alimentation par succion. Le plan statistique que nous avons utilis\u00e9 nous a permis de r\u00e9pondre \u00e0 trois questions simples : la taille a-t-elle une importance ? Le stade de d\u00e9veloppement a-t-il une importance ? Et la taille et le stade de d\u00e9veloppement ont-ils un effet conjoint sur la variable ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsque l'on repr\u00e9sente graphiquement les mesures cin\u00e9matiques en fonction de la taille corporelle, on peut observer comment ces mesures \u00e9voluent au fur et \u00e0 mesure que les animaux grandissent. On peut s'attendre \u00e0 trois tendances principales selon la r\u00e9ponse :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Si seule la taille a une incidence, les larves et les m\u00e9tamorphes suivent la m\u00eame relation par rapport \u00e0 la taille. Elles peuvent donc \u00eatre d\u00e9crites par une seule droite de r\u00e9gression.<\/li>\n\n\n\n<li>Si le stade de d\u00e9veloppement a un effet ind\u00e9pendant de la taille, les larves et les m\u00e9tamorphes pr\u00e9sentent des valeurs diff\u00e9rentes, mais leur relation avec la taille reste la m\u00eame. Il en r\u00e9sulte deux droites de r\u00e9gression parall\u00e8les dont les ordonn\u00e9es \u00e0 l'origine sont diff\u00e9rentes.<\/li>\n\n\n\n<li>Si l'effet de la taille varie entre les larves et les m\u00e9tamorphes, la pente et l'ordonn\u00e9e \u00e0 l'origine de leurs droites de r\u00e9gression diff\u00e8rent toutes deux.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Expansion buccale : devenir plus grand et plus efficace pour attraper ses proies<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Les param\u00e8tres d'expansion buccale \u00e9taient les seules variables non influenc\u00e9es par un effet conjoint de la taille et du stade de d\u00e9veloppement. L'ouverture buccale augmentait uniquement en fonction de la taille, tandis que l'abaissement de l'os hyo\u00efde d\u00e9pendait exclusivement du stade de d\u00e9veloppement, avec des valeurs plus \u00e9lev\u00e9es chez les m\u00e9tamorphes. Dans l'ensemble, ces r\u00e9sultats sugg\u00e8rent que la capacit\u00e9 \u00e0 capturer des proies plus grosses augmente avec la taille corporelle et pourrait \u00eatre encore renforc\u00e9e apr\u00e8s la m\u00e9tamorphose gr\u00e2ce \u00e0 un abaissement plus important de l'os hyo\u00efde.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"509\" src=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/figure_buccal_expansion_vulgarisation-1-edited.png\" alt=\"\" class=\"wp-image-3917\" srcset=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/figure_buccal_expansion_vulgarisation-1-edited.png 900w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/figure_buccal_expansion_vulgarisation-1-edited-300x170.png 300w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/figure_buccal_expansion_vulgarisation-1-edited-768x434.png 768w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/figure_buccal_expansion_vulgarisation-1-edited-18x10.png 18w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><figcaption class=\"wp-element-caption\">Les donn\u00e9es brutes sont superpos\u00e9es aux droites de r\u00e9gression pr\u00e9vues par le mod\u00e8le. Les donn\u00e9es brutes ont \u00e9t\u00e9 soumises \u00e0 une transformation logarithmique (log10). * Indique une pente significativement diff\u00e9rente de z\u00e9ro, tandis que \u00ab NS \u00bb signifie que la pente n'est pas significativement diff\u00e9rente de z\u00e9ro.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Du rythme lent au rythme rapide : comment le d\u00e9veloppement modifie les horaires des repas<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">En ce qui concerne les variables de dur\u00e9e, elles ont toutes \u00e9t\u00e9 influenc\u00e9es par un effet conjoint de la taille et du stade de d\u00e9veloppement, selon une tendance constante : les dur\u00e9es augmentaient avec la taille chez les larves, mais diminuaient avec la taille chez les m\u00e9tamorphes. En fin de compte, cela signifie que, par rapport \u00e0 leur taille, les m\u00e9tamorphes se d\u00e9pla\u00e7aient plus rapidement que les larves.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette tendance co\u00efncide avec les diff\u00e9rences d'ossification du cr\u00e2ne entre les larves et les m\u00e9tamorphes (voir l'illustration tir\u00e9e de Smirnov et al. 2020 <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC7476196\/figure\/joa13210-fig-0001\/\">ici<\/a><a><\/a><a><\/a>). Le cr\u00e2ne larvaire est principalement cartilagineux, tandis que, pendant la m\u00e9tamorphose, un pic de s\u00e9cr\u00e9tion d'hormones thyro\u00efdiennes favorise l'ossification et la diff\u00e9renciation du cr\u00e2ne m\u00e9tamorphique.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cependant, les muscles peuvent agir plus efficacement sur les os ossifi\u00e9s, car leur rigidit\u00e9 permet une transmission plus directe des forces musculaires. \u00c0 l'inverse, les os cartilagineux sont plus souples et peuvent se d\u00e9former lors de la contraction musculaire, ce qui dissipe une partie de la force produite et r\u00e9duit l'efficacit\u00e9 du mouvement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Deux fa\u00e7ons d'augmenter la puissance d'aspiration<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Par rapport aux larves, les m\u00e9tamorphes pr\u00e9sentent des mouvements d\u2019expansion buccale plus rapides, ce qui pourrait leur permettre d\u2019atteindre plus t\u00f4t la vitesse de flux maximale, une strat\u00e9gie connue pour augmenter la force d\u2019aspiration. Cependant, une expansion buccale plus lente chez les larves ne signifie pas n\u00e9cessairement une aspiration plus faible. Elles pourraient en effet compenser ce ph\u00e9nom\u00e8ne gr\u00e2ce \u00e0 leurs lobes labiaux d\u00e9velopp\u00e9s, ces replis cutan\u00e9s reliant les m\u00e2choires sup\u00e9rieure et inf\u00e9rieure. Ces structures sont connues pour accro\u00eetre l\u2019efficacit\u00e9 de l\u2019aspiration en r\u00e9duisant la taille de l\u2019ouverture buccale. De plus, les larves peuvent renforcer encore davantage la succion gr\u00e2ce \u00e0 l\u2019ouverture des fentes branchiales, qui commence pendant la phase d\u2019expansion buccale et permet \u00e0 l\u2019eau de continuer \u00e0 s\u2019\u00e9couler de la bouche vers l\u2019arri\u00e8re de la t\u00eate.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"510\" src=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_buccal_expansion-2-edited.png\" alt=\"\" class=\"wp-image-3934\" srcset=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_buccal_expansion-2-edited.png 900w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_buccal_expansion-2-edited-300x170.png 300w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_buccal_expansion-2-edited-768x435.png 768w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_buccal_expansion-2-edited-18x10.png 18w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><figcaption class=\"wp-element-caption\">Les donn\u00e9es brutes sont superpos\u00e9es aux droites de r\u00e9gression pr\u00e9vues par le mod\u00e8le. Les donn\u00e9es brutes ont \u00e9t\u00e9 soumises \u00e0 une transformation logarithmique (log10). * Indique une pente significativement diff\u00e9rente de z\u00e9ro.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Emp\u00eacher la proie de s'enfuir<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Chez les m\u00e9tamorphes, le syst\u00e8me d\u2019\u00e9coulement bidirectionnel rend les phases finales de l\u2019aspiration particuli\u00e8rement difficiles. Une fois l\u2019os hyo\u00efde abaiss\u00e9 au maximum, le flux s\u2019inverse, et les m\u00e9tamorphes doivent rouvrir l\u00e9g\u00e8rement la bouche pour expulser l\u2019eau. Ces mouvements peuvent donner \u00e0 la proie l\u2019occasion de s\u2019\u00e9chapper. Par cons\u00e9quent, raccourcir la dur\u00e9e de la fermeture des m\u00e2choires et de l\u2019\u00e9l\u00e9vation de l\u2019hyo\u00efde gr\u00e2ce \u00e0 des mouvements plus rapides pourrait contribuer \u00e0 r\u00e9duire le risque de fuite de la proie. Chez les larves, bien que les mouvements soient plus lents, le risque de fuite de la proie peut \u00e9galement \u00eatre r\u00e9duit par leurs lobes labiaux, qui obstruent les parties lat\u00e9rales de la bouche. De plus, l\u2019ouverture des fentes branchiales aide \u00e0 maintenir la succion vers l\u2019arri\u00e8re de la t\u00eate, ce qui peut entra\u00eener la proie plus profond\u00e9ment dans la gorge et r\u00e9duire ses chances de s\u2019\u00e9chapper.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"509\" src=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_final-edited.png\" alt=\"\" class=\"wp-image-3921\" srcset=\"https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_final-edited.png 900w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_final-edited-300x170.png 300w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_final-edited-768x434.png 768w, https:\/\/metamorphosis-project.org\/wp-content\/uploads\/2026\/09\/vulgarisation_suction_final-edited-18x10.png 18w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><figcaption class=\"wp-element-caption\">Les donn\u00e9es brutes sont superpos\u00e9es aux droites de r\u00e9gression pr\u00e9vues par le mod\u00e8le. Les donn\u00e9es brutes ont \u00e9t\u00e9 soumises \u00e0 une transformation logarithmique (log10). * Indique une pente significativement diff\u00e9rente de z\u00e9ro, tandis que \u00ab NS \u00bb signifie que la pente n'est pas significativement diff\u00e9rente de z\u00e9ro.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Des outils diff\u00e9rents, un m\u00eame objectif<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">En conclusion, la m\u00e9tamorphose modifie les relations entre la taille corporelle (SVL) et la plupart de nos variables cin\u00e9matiques, ce qui va dans le sens de l\u2019hypoth\u00e8se du d\u00e9couplage adaptatif. Toutefois, des \u00e9tudes suppl\u00e9mentaires sont n\u00e9cessaires pour d\u00e9terminer si ce d\u00e9couplage fonctionnel s'accompagne d'une r\u00e9duction de la concurrence entre les stades de d\u00e9veloppement, comme le pr\u00e9voit l'hypoth\u00e8se. D'autant plus que nos r\u00e9sultats sugg\u00e8rent plut\u00f4t un compromis morpho-fonctionnel : les larves pourraient am\u00e9liorer leur capacit\u00e9 d'aspiration et de r\u00e9tention des proies gr\u00e2ce \u00e0 leurs lobes labiaux et \u00e0 leurs fentes branchiales, tandis que les m\u00e9tamorphes pourraient compenser la perte de ces structures larvaires par des mouvements plus rapides rendus possibles par l'ossification cr\u00e2nienne.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>La m\u00e9tamorphose peut avoir un co\u00fbt \u00e9lev\u00e9 pour les animaux, car pendant cette phase de transition, l'organisme peut s'affaiblir et devenir plus vuln\u00e9rable face aux pr\u00e9dateurs. Cependant, les avantages de la m\u00e9tamorphose peuvent l'emporter sur ses inconv\u00e9nients. 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But there are benefits of metamorphosis that may outweigh the costs. Here we share the findings of our new study, published in Biology Open, investigating the impact of metamorphosis and size on the aquatic feeding kinematics of the Iberian ribbed newt.","og:url":"https:\/\/metamorphosis-project.org\/fr\/editions-2\/larves-et-metamorphes-du-triton-strie-iberique-a-chacun-ses-atouts-malgre-un-changement-de-tete\/","article:published_time":"2026-09-30T07:20:55+00:00","article:modified_time":"2026-10-20T19:11:41+00:00","twitter:card":"summary_large_image","twitter:site":"@kafka_project","twitter:title":"Larvae vs. metamorphs of the Iberian ribbed newt: to each their own strengths, despite a head makeover - Meta-Morphosis Project","twitter:description":"Metamorphosis can have a high cost for animals since during the transition, an organism can become weaker and more vulnerable to predators. But there are benefits of metamorphosis that may outweigh the costs. 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