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Effects of Intraspecific Variability of Invertebrates' Phenotype on Litter Decomposition

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Effects of Intraspecific Variability of Invertebrates' Phenotype on Litter Decomposition Effects of intraspecific variability of invertebrates’ phenotype on litter decomposition Thibaut Rota To cite this version: Thibaut Rota. Effects of intraspecific variability of invertebrates’ phenotype on litter decomposition. Global Changes. Université Paul Sabatier - Toulouse III, 2018. English. NNT : 2018TOU30309. tel-02080487v2 HAL Id: tel-02080487 https://tel.archives-ouvertes.fr/tel-02080487v2 Submitted on 7 Feb 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Délivré par l'Université de Toulouse III – Paul Sabatier Discipline ou spécialité : Ecologie fonctionnelle Thibaut Rota le 20 novembre 2018 Effets de la variabilité intraspécifique du phénotype des invertébrés sur la décomposition des litières École doctorale et discipline ou spécialité SDU2E – Ecologie Fonctionnelle Unité de recherche EcoLab – Laboratoire d'Ecologie Fonctionnelle (UMR 5245) Directeurs de Thèse Antoine Lecerf et Éric Chauvet Jury Mark O. Gessner (Président du Jury) Olivier Dangles (Rapporteur) John S. Richardson (Rapporteur) Cristina Canhoto (Examinatrice) François Guérold (Examinateur) Lisa Jacquin (Examinatrice) Fishing makes us less the hostages to the horrors of making a living. In some sense it returns us to the aesthetics of the ancient art of gathering and hunting for food. – Jim Harrison, "A Plaster Trout in Worm Heaven" … A tous les êtres qui me sont chers … Remerciements Je tiens tout d'abord à remercier mes directeurs de thèse : Antoine et Éric, qui ont toujours répondu présent, pour échanger, débattre les idées, m'aider à mettre en place les expériences, autant sur le papier que sur le terrain, m'aider à analyser les résultats, et pour m'aider à rédiger les manuscrits. Votre accompagnement a été essentiel, un grand merci à vous deux. Merci à John Richardson et à Olivier Dangles d'avoir rigoureusement évalué et critiqué ce travail de thèse, vos rapports écrits et nos échanges m'ont permis de relever les forces et les faiblesses de mon travail, une aide indéniable pour pouvoir améliorer la qualité des manuscrits avant leur soumission aux journaux. Merci aux examinateurs(-trices), Cristina Canhoto, François Guérold et Lisa Jacquin, et au président du jury, Mark Gessner, pour les discussions très enrichissantes qui ont émergées à l'issue de ma soutenance, qui m'aideront à augmenter la qualité de mon travail, mais aussi à viser un cap dans les thématiques de recherche que j'aimerai aborder dans les années à venir. Ce sera toujours un plaisir de pouvoir échanger avec vous. Big up pour Franck, le directeur de l'EcoLab, et le responsable de mon équipe BIOREF, Pascal (j'adore tes chemises!) pour leur bienveillance et leur acceuil chaleureux. Merci à Cyril, Catherine, Cécile et Régine pour leur aide au jour le jour et leur bonne humeur. Merci Sylvain pour toute l'énergie mentale (1) et physique (2) que tu as dépensé pour ma thèse, la première, pour supporter mes idiosyncrasies scientifiques, la deuxième, pour planter des piquets dans les rivières avec le marteau de Torr. Merci à Frédéric et Didier pour leurs super capacités analytiques et leur bonne humeur à toute épreuve. Je garde the last but not least pour le grand Jérémy, qui m'a appris à faire sporuler des hyphomycètes aquatiques et à les faire coloniser des disques de feuilles, qui m'a souvent aidé sur le terrain, toujours prêt à partager les meilleurs et les pires moments. Si tu fais la gueule, tu clique sur ON sur le juke box, et le petit Brassens qui sort, il te redonne le sourire. Merci à Achour et à Tom, qui m'ont accompagné dans mon travail à travers leur stage de master 2 avec le sourire, même dans parfois de mauvaises conditions de terrain ou dans les dédales de lignes de codes R. Merci à François Guérold, Philippe W. & R., Mickael, Vincent, Max, Quentin, Alice et tous les autres du LIEC de Metz qui m'ont aidé à réaliser ma manip dans leur labo. Merci à Eva et Ludovic de l'OMP pour m'avoir permis de m'essayer aux sciences participatives. Un grand merci à Cristina pour la visite de ta splendide université. Je tenais finalement à remercier chaleureusement Benjamin Pey et Arnaud Sentis pour avoir cru en mes idées. Vous êtes de super collaborateurs. Je voudrais remercier ma famille, qui m'a accompagné dans mes enthousiasmes et mes désespoirs, mais surtout parce qu'elle n'est en rien responsable pour mon goût prononcé pour les milieux aquatiques et la nature sauvage. Ce goût, j'ai eu la chance de l'éprouver depuis mon jeune âge lors de la cueillette des champignons ou des châtaignes en forêt avec mon grand-père ou ma tante (merci mémé pour les identifications qui nous ont peut-être sauvés la vie!), puis à la pêche tout minot avec mon cousin François, je me rappellerai toujours de l'endroit où nous étions assis sur les berges de l'Oignin à pêcher des vairons. Plus tard j'ai dévoré les histoires de pêche de mon papy, qui m'ont données une vive envie de découvrir la Valserine où j'ai ensuite passé des journées magnifiques. Merci papa pour toutes ces heures de traque sur la Bienne, l'Oignin ou l'Ain à la recherche des plus belles truites sauvages qui soient, quelle chance j'ai. C'est tous ces moments dans la nature qui m'ont amené à m'intéresser à l'écologie scientifique. Merci maman pour ton dévouement, pour l'amour et le soutien que tu m'apportes. Un gros bisou à ma sœur Julie, et à mes frères, Maxence et Boris. Merci aux Toulousaings de l'étape. Seb, Fel fel et Marine pour les super moments passés avec vous. Merci à tous au labo. Merci à Sarah, Quentin alias Scanvy, Vincent, Justine et les 2 Nicos pour leur bonne humeur sans faille. Merci Fanny d'avoir partagé avec moi un bout de ta vie. Grosse bise aux Bisontins, Louis, PapaPrev, Morgane, Pierre, François, Yaya et Babas, et mes camarades de promos. Un grand merci au Haut-Bugey, à Perdu, Momo, Weber, Ced, Yvan, Bam, Wader, Totor, Nyfe, Niémo et toute cette belle meute pour cette fabuleuse amitié qui semble inébranlable. Laura, tu illumines ma vie, quel bonheur Table des Matières CHAPITRE I ........................................................................................ 1 INTRODUCTION I.1 Les traits phénotypiques : une clé de voûte entre l'environnement et l'écosystème ........................................................................................................................... 1 I.1.1 Les traits phénotypiques ....................................................................................... 1 I.1.2 Les principales causes de la variabilité phénotypique à l'échelle intraspécifique 3 I.1.3 Dynamiques éco-évolutives ................................................................................. 6 I.1.4 (Co)Variations des traits phénotypiques au niveau intraspécifique et conséquences sur le fonctionnement des écosystèmes ..................................................... 10 I.2 Etat de l'art : variabilité des traits phénotypiques et consommation des ressources ............................................................................................................................ 15 I.2.1 Contexte et méthode ........................................................................................... 15 I.2.2 Synthèse ............................................................................................................. 16 I.3 Liens entre variabilité phénotypique intraspécifique et fonctionnement de l'écosystème à travers l'étude de la décomposition des litières ...................................... 19 I.3.1 Synthèse des principaux facteurs biotiques affectant la décomposition des litières 19 I.3.2 Variabilité intraspécifique et décomposition des litières ................................... 23 I.4 Objectifs et hypothèses de travail ........................................................................... 23 I.4.1 Objectifs généraux .............................................................................................. 23 I.4.2 Hypothèses générales ......................................................................................... 25 I.4.3 Travaux effectués en complément de ce travail de thèse ................................... 27 CHAPITRE II .................................................................................... 29 METHODOLOGIE CHAPITRE III ................................................................................... 37 VARIABILITE DU TAUX DE CONSOMMATION DE LITIERES AUX NIVEAUX INTER- ET INTRASPECIFIQUES CHEZ DES DETRITIVORES TERRESTRES ET AQUATIQUES CHAPITRE IV ................................................................................... 59 DETERMINANTS PHENOTYPIQUES DE LA VARIABILITE INTER-INDIVIDUELLE DU TAUX DE CONSOMMATION DES LITIERES CHEZ UNE POPULATION DE DETRITIVORES CHAPITRE V .................................................................................... 89 EFFET DU PHENOTYPE SUR LES CASCADES TROPHIQUES INDIVIDUELLES D'UN PREDATEUR DANS UN CONTEXTE NATUREL 89 CHAPITRE VI ................................................................................. 129 MODULATION DE L'EFFET DU RECHAUFFEMENT SUR LE FONCTIONNEMENT D'UN ECOSYSTEME DETRITIQUE PAR
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