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| Titre : |
Foliar strategies and within-leaf allocating patterns across three leaf types in the Araliaceae of New Caledonia
|
| Auteur(s) : |
Eva Gril, Auteur (et co-auteur)
Yves Caraglio, Directeur de mémoire Sandrine Isnard, Responsable de stage David Bruy, Responsable de stage |
| Type de document : | Mémoire |
| Filière : | M. : BIOGET -- Biodiversité végétale et Gestion des Écosystèmes Tropicaux |
| Sujets : | Nouvelle-Calédonie ; Araliacées |
| Résumé : |
Araliaceae family is well represented in New Caledonia, where ca. 75 species occur with a great diversity of foliar types across genera and branching patterns (from monocaulous to well-branched species). We conducted a comparative study of leaf types (simple, pinnate, palmate) on 270 leaves from 18 taxa, endemic to New Caledonia. The three leaf types diverged significantly in their petiole to lamina and within lamina allocating patterns. The petioles of palmate leaves (Plerandra spp.) have a higher investment into structural support, as shown by their dry mass partitioning, and further confirmed by preliminary mechanical and anatomical studies. Increasing leaf area came at higher costs in palmate leaves while lamina cost remained constant to reduced in the simple and pinnate leaves ([...] Araliaceae family is well represented in New Caledonia, where ca. 75 species occur with a great diversity of foliar types across genera and branching patterns (from monocaulous to well-branched species). We conducted a comparative study of leaf types (simple, pinnate, palmate) on 270 leaves from 18 taxa, endemic to New Caledonia. The three leaf types diverged significantly in their petiole to lamina and within lamina allocating patterns. The petioles of palmate leaves (Plerandra spp.) have a higher investment into structural support, as shown by their dry mass partitioning, and further confirmed by preliminary mechanical and anatomical studies. Increasing leaf area came at higher costs in palmate leaves while lamina cost remained constant to reduced in the simple and pinnate leaves (Meryta spp. and Polyscias spp.). In compound leaves, this might be explained by leaflet cost that increase with leaf area in palmate leaves bearing few larger leaflets while leaflets cost remains seemingly constant for pinnate leaves, bearing smaller and more numerous leaflets. As predicted by Corner’s rule, leaf size is related to branching degree, monocaulous trees tend to deploy larger leaves than well-branched individuals. Leaf size was constrained both by branching degree and environment across genera. |
| Editeur(s) : | Montpellier [France] : AgroParisTech ; Montpellier : Université de Montpellier |
| Date de publication : | 2018 |
| Format : | 1 vol. (48 p.) |
| Note(s) : |
Stage de fin d'étude pour l'obtention du Master 2 Biologie, écologie, évolution (Parcours Biodiversité végétale et Gestion des Ecosystèmes Tropicaux - BIOGET)
|
| Langue(s) : | Anglais |
| Organisme d'accueil : | IRD |
| Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=198694 |
Exemplaires (1)
| Localisation | Emplacement | Pôle | Section | Cote | Support | Disponibilité |
|---|---|---|---|---|---|---|
| Montpellier | Serveur | Forêt | E-18 BGT GRI | Numérique | Consultable sous conditions Disponible |