[en] Lowland tropical bryophytes have been perceived as excellent dispersers. In such groups, the inverse isolation hypothesis proposes that spatial genetic structure is erased beyond the limits of short-distance dispersal. Here, we determine the relative influence of environmental variation and geographic barriers on the spatial genetic structure of a widely dispersed and phylogenetically independent sample of Amazonian bryophytes.
• Single nucleotide polymorphism data were produced from a restriction site-associated DNA sequencing protocol for 10 species and analyzed through F-statistics and Mantel tests.
• Neither isolation-by-environment nor the impact of geographic barriers were recovered from the analyses. However, significant isolation-by-distance patterns were observed for 8 out of the 10 investigated species beyond the scale of short-distance dispersal (>1 km), offering evidence contrary to the inverse isolation hypothesis.
• Despite a cadre of life-history traits and distributional patterns suggesting that tropical bryophytes are highly vagile, our analyses reveal spatial genetic structures comparable to those documented for angiosperms, whose diaspores are orders of magnitude larger. Dispersal limitation for common, widespread tropical bryophytes flies in the face of traditional assumptions regarding bryophyte dispersal potential in tropical environments, and suggests that the plight of this component of cryptic biodiversity is more dire than previously considered in light of accelerated forest fragmentation in the Amazon.
Pereira, Marta; National Institute for Amazonian Research - Manaus, Brazil > Department of Biodiversity
Overson, Rick; Global Institute of Sustainability - Tempe, USA
Laenen, Benjamin; Science for Life laboratory - Stockholm, Sweden > Department of Ecology > Environment and Plant Sciences
Mardulyn, Patrick; Université Libre de Bruxelles (ULB) - Bruxelles, Belgium > Evolutionary Biology and Ecology
Gradstein, Stephan Robbert; Muséum National d'Histoire Naturelle (Paris, France) > Institut de Systématique, Evolution, Biodiversité
De Haan, Myriam; Meise Botanic Garden - Meise, Belgium > Research Department
Ballings, Petra; Meise Botanic Garden - Meise, Belgium > Research Department
Van der Beeten, Iris; Meise Botanic Garden - Meise, Belgium > Research Department
Zartman, Charles Eugene; National Institute for Amazonian Research - Manaus, Belgium > Department of Biodiversity
Vanderpoorten, Alain ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie de l'évolution et de la conservation - aCREA-Ulg
✱ These authors have contributed equally to this work.
Language :
English
Title :
What do tropical cryptogams reveal? Strong genetic structure in Amazonian bryophytes
Publication date :
02 June 2020
Journal title :
New Phytologist
ISSN :
0028-646X
eISSN :
1469-8137
Volume :
228
Issue :
2
Pages :
640-650
Peer reviewed :
Peer reviewed
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
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