How (much) do flowers vary? Unbalanced disparity among flower functional modules and a mosaic pattern of morphospace occupation in the order Ericales

Autor(en)
Marion Chartier, Stefan Loefstrand, Anna Maria Louise von Balthazar-Schönenberger, Sylvain Gerber, Florian Jabbour, Herve Sauquet, Jürg Schönenberger
Abstrakt

The staggering diversity of angiosperms and their flowers has fascinated scientists for centuries. However, the quantitative distribution of floral morphological diversity (disparity) among lineages and the relative contribution of functional modules (perianth, androecium and gynoecium) to total floral disparity have rarely been addressed. Focusing on a major angiosperm order (Ericales), we compiled a dataset of 37 floral traits scored for 381 extant species and nine fossils. We conducted morphospace analyses to explore phylogenetic, temporal and functional patterns of disparity. We found that the floral morphospace is organized as a continuous cloud in which most clades occupy distinct regions in a mosaic pattern, that disparity increases with clade size rather than age, and that fossils fall in a narrow portion of the space. Surprisingly, our study also revealed that among functional modules, it is the androecium that contributes most to total floral disparity in Ericales. We discuss our findings in the light of clade history, selective regimes as well as developmental and functional constraints acting on the evolution of the flower and thereby demonstrate that quantitative analyses such as the ones used here are a powerful tool to gain novel insights into the evolution and diversity of flowers.

Organisation(en)
Department für Botanik und Biodiversitätsforschung
Externe Organisation(en)
Stockholm University, Museum national d'Histoire Naturelle, Université Paris XI - Paris-Sud
Journal
Proceedings of the Royal Society of London B: Biological Sciences
Band
284
Anzahl der Seiten
10
ISSN
0962-8452
DOI
https://doi.org/10.1098/rspb.2017.0066
Publikationsdatum
04-2017
Peer-reviewed
Ja
ÖFOS 2012
106042 Systematische Botanik, 106008 Botanik, 106012 Evolutionsforschung
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/how-much-do-flowers-vary-unbalanced-disparity-among-flower-functional-modules-and-a-mosaic-pattern-of-morphospace-occupation-in-the-order-ericales(19a49564-348b-47b2-9bc5-35ce90961735).html