10.5061/DRYAD.3K8C480
Margaroni, Sofia
Monash University
Petersen, Kurt B.
Monash University
Gleadow, Roslyn
Monash University
Burd, Martin
Monash University
Data from: The role of spore size in the global pattern of co-occurrence
among Selaginella species
Dryad
dataset
2019
Vascular plant
interspecific competition
limiting similarity
megaspore
heterospory
geographic range
Holocene
Selaginella
reproductive niche
National Science Foundation
https://ror.org/021nxhr62
EF-0553768
2019-02-26T21:03:15Z
2019-02-26T21:03:15Z
en
https://doi.org/10.1111/jbi.13532
69882 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Aim: Separation of regeneration niches may promote coexistence among
closely related plant species, but there is little evidence that
regeneration traits affect species ranges at large geographic scales. Here
we address patterns of co-occurrence within the genus Selaginella, an
ancient lineage of free-sporing, heterosporous, vascular plants.
Specifically, we ask whether differences between species in spore size are
associated with the extent of overlap in their geographic ranges, a
measure of opportunity for ecological interaction. Taxon: Selaginella
(Selaginellaceae: Lycopodiales) Methods: We used quantile regression to
examine the relationship of spore size ratios (pairwise ratios for
megaspores and microspores of co-occurring species) to the area of range
overlap and to latitude for a worldwide sample of 112 Selaginella species.
Phylogenetically informed tests of statistical significance were used for
each percentile relationship examined in the quantile regressions.
Results: Large pairwise disparities in megaspore sizes were significantly
associated with large range overlap. Disparities also tended to be larger
at low latitudes. Microspore size differences, in contrast, were unrelated
to shared range area or latitude. Main conclusion: Megaspore size appears
to affect coexistence at a broad regional scale among Selaginella species,
in at least some cases. The pattern is consistent with some degree of
competitive structuring of size-related aspects of dispersal and
establishment of propagules among some co-occurring species. Habitat
complexity, such as open microsites within otherwise closed and shaded
vegetation, seems likely to promote reproductive niche separation and may
account for the latitudinal structure in Selaginella spore sizes.
Margaroni et al. Journal of Biogeography Online DataThis single CSV file
contains the data used in the analysis of S. Margaroni et al., The role of
spore size in the global pattern of co-occurrence among Selaginella
species, Journal of Biogeography. Data available for 113 species of
Selaginella are: species name, average megaspore volume in cubic
micrometers, average microspore volume in cubic micrometers, area in
square kilometers of geographic range (estimated as minimum convex polygon
containing GBIF occurrence points), latitude of centroid of the species
range polygon in degrees (absolute value, i.e., ignoring N or S latitude),
and the number of other species ranges that overlap with a given species.
Data available for 923 instances of pairwise range overlap between species
are: names of the two species involved, area of overlap between range
polygons in square kilometers, megaspore volume ratio, and microspore
volume ratio (ratio of larger spore volume to smaller spore volume of the
two species in the pair).Margaroni_JBiogeogr_Online_data.csv
Global