Adjacency and area explain species bioregional shifts in neotropical palms
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2019
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Resumo
Environmental and geographical variables are known drivers of community assembly,
however their influence on phylogenetic structure and phylogenetic beta diversity of
lineages within different bioregions is not well-understood. Using Neotropical palms as a
model, we investigate how environmental and geographical variables affect the assembly
of lineages into bioregions across an evolutionary time scale. We also determine lineage
shifts between tropical (TRF) and non-tropical (non-TRF) forests. Our results identify
that distance and area explain phylogenetic dissimilarity among bioregions. Lineages
in smaller bioregions are a subset of larger bioregions and contribute significantly to the
nestedness component of phylogenetic dissimilarity, here interpreted as evidence for a
bioregional shift. We found a significant tendency of habitat shifts occurring preferentially
between TRF and non-TRF bioregions (31 shifts) than from non-TRF to TRF (24) or
from TRF to TRF (11) and non-TRF to non-TRF (9). Our results also present cases
where low dissimilarity is found between TRF and non-TRF bioregions. Most bioregions
showed phylogenetic clustering and larger bioregions tended to be more clustered than
smaller ones, with a higher species turnover component of phylogenetic dissimilarity.
However, phylogenetic structure did not differ between TRF and non-TRF bioregions
and diversification rates were higher in only two lineages, Attaleinae and Bactridinae,
which are widespread and overabundant in both TRF and non-TRF bioregions. Area and
distance significantly affected Neotropical palm community assembly and contributed
more than environmental variables. Despite palms being emblematic humid forest
elements, we found multiple shifts from humid to dry bioregions, showing that palms
are also important components of these environments.
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Arecaceae, Phylogenetic turnover, Community phylogenetics, Phylogenetic nestedness, Geographical variables
Citação
FREITAS, Cintia G.; BACON, Christine D.; SOUZA-NETO, Advaldo C.; COLLEVATTI, Rosane G. Adjacency and area explain species bioregional shifts in neotropical palms. Frontiers in Plant Science, Lausanne, v. 10, p. 1-16, 2019. DOI: 10.3389/fpls.2019.00055. Disponível em: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6370682/. Acesso em: 22 mar. 2023.