10.5061/DRYAD.8931ZCRQ8
Provost, Kaiya
0000-0002-5865-7238
The Ohio State University
Myers, Edward A.
National Museum of Natural History
Smith, Brian
American Museum of Natural History
Community phylogeographic patterns reveal how a barrier filters and
structures taxa in North American warm deserts
Dryad
dataset
2021
biogeographic barrier
comparative phylogeography
isolation-with-migration
neural net
2022-03-07T00:00:00Z
2021-11-03T00:00:00Z
en
https://doi.org/10.1111/jbi.14115
546555901 bytes
4
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Aim: The study of biogeographic barriers has been instrumental in
understanding the evolution and distribution of taxa. With the increasing
availability of empirical datasets, emergent patterns can be inferred from
communities by synthesizing how barriers filter and structure populations
across species. We assemble phylogeographic data across a barrier and
perform spatially-explicit simulations to quantify spatiotemporal patterns
of divergence, the influence of species traits on these patterns, and the
statistical power needed to differentiate alternative diversification
modes. Location: North America Methods: We incorporate published datasets
to examine taxa around the Cochise Filter Barrier, separating the Sonoran
and Chihuahuan Deserts of North America, to synthesize phylogeographic
structuring across the community with respect to organismal functional
traits. We then use simulation and machine learning to assess the power of
phylogeographic model selection. Results: Taxa distributed across the
Cochise Filter Barrier show heterogeneous responses to the barrier in
levels of gene flow, phylogeographic structure, divergence timing, barrier
width, and divergence mechanism. These responses correlate with locomotor
and thermoregulatory traits. Many taxa show a Pleistocene population
genetic break, often with introgression after divergence. Allopatric
isolation and isolation-by-environment are the primary mechanisms
structuring genetic divergence within taxa. Simulations reveal that in
spatially-explicit isolation-with-migration models across the barrier, age
of divergence, presence of gene flow, and presence of
isolation-by-distance can confound the interpretation of evolutionary
history and model selection by producing easily-confusable results. We
re-analyze five empirical genetic datasets to illustrate the utility of
these simulations despite these constraints. Main Conclusions: By
synthesizing phylogeographic data for the Cochise Filter Barrier we show
that barriers interact with species traits to differentiate taxa in
communities over millions of years. Identifying diversification modes
across the barrier for these taxa remains challenging because commonly
invoked demographic models may not be identifiable across a range of
likely parameter space.