Allopatric speciation is more prevalent than parapatric ecological divergence in a recent high-Andean diversification (Linochilus: Asteraceae)

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RT @PeerJLife: Allopatric speciation is more prevalent than parapatric ecological divergence in a recent high-Andean diversification (Linoc…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
RT @Oscarmvargash: Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric s…
Exited to share our new paper about speciation in the highly biodiverse páramos– we find a strong signal of allopatric speciation in Linochilus sister species #cienciacriolla https://t.co/TecuV6TMWG https://t.co/S4mprmrYCP
Allopatric speciation is more prevalent than parapatric ecological divergence in a recent high-Andean diversification (Linochilus: Asteraceae) Read the full article https://t.co/9IBSOcEhGi #Biodiversity #Biogeography #EvolutionaryStudies #PlantScience
Biodiversity and Conservation

Main article text

 

Introduction

Materials and Methods

Focal clade

Sister species comparisons

  • If a sister-species pair is allopatric and there is no significant difference between their leaf areas, we interpreted this scenario as an event of allopatric speciation driven by geographical isolation, with the reasoning that leaf area had remained similar because either relatively little time had passed since divergence and/or because of niche conservatism (Fig. 1A; Wiens, 2004; Pyron et al., 2015).

  • If a sister-species pair is allopatric and their leaf areas are significantly different, we interpreted this scenario as an event of allopatric speciation following geographical isolation (Fig. 1B) in which there was subsequent ecological divergence driven by local adaption (Rundell & Price, 2009; Pyron et al., 2015).

  • If a sister-species pair has overlapping geographical distributions and there is no significant difference between their leaf areas, we interpreted this scenario as inconclusive (Fig. 1C). This pattern could be the result of various processes, i.e., sympatric speciation, allopatric speciation with no ecological divergence followed by secondary contact (Rundell & Price, 2009; Hopkins, 2013), or parapatric speciation driven by ecological divergence in a trait other than leaf area (e.g., Snaydon & Davies, 1976; Silvertown et al., 2005).

  • If a sister-species pair is scored as sympatric and their leaf areas are different, we interpreted this scenario as an event of parapatric speciation with ecological divergence (Rundle & Nosil, 2005; Rundell & Price, 2009) (Fig. 1D).

Evaluating niche conservatism

Biogeographic analysis

  • Northern Páramos (N). Páramos in the “Sierra Nevada de Santa Marta” and the “Serranía del Perijá”.

  • Talamanca* (T). Páramos in the Talamanca Cordillera, Central America.

  • Mérida* (T). Páramos in the Mérida Cordillera, Venezuela.

  • Eastern Cordillera (E). Páramos in the Colombian Eastern Cordillera.

  • Antioquia (A). Cluster of páramos comprising the areas in the Colombian Western and Central Cordilleras in the department of Antioquia.

  • Western Cordillera (W). Páramos in the Colombian Western Cordillera with the exception of those located in the department of Antioquia.

  • Central Cordillera (C). Páramos in the Colombian Central Cordillera with the exception of those located in the department of Antioquia.

  • Southern Páramos (S). Páramos in the Colombian Massif and the Ecuadorian Andes.

Results

Evaluating niche conservatism

Biogeographic analyses

Discussion

Allopatric vs. parapatric ecological speciation in the páramo

Alternative hypotheses and further considerations

Spatiotemporal history of Linochilus in the context of the páramo

Conclusions

Supplemental Information

Appendices.

Occurrences used for the speciation and historical biogeographical analyses; leaf area measurements; number of individuals and total number of leaves measured for every species; missing species from the Vargas, Ortiz & Simpson (2017) phylogeny; sister species comparisons based solely on the phylogeny of Vargas, Ortiz & Simpson (2017); range overlap calculated using 0.1 and 0.05 decimal degrees grids based solely on the phylogeny of Vargas, Ortiz & Simpson (2017); distribution of sister species based on the phylogeny Vargas, Ortiz & Simpson (2017).

DOI: 10.7717/peerj.15479/supp-1

Additional Information and Declarations

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Oscar M. Vargas conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Santiago Madriñán conceived and designed the experiments, authored or reviewed drafts of the article, and approved the final draft.

Beryl Simpson conceived and designed the experiments, authored or reviewed drafts of the article, and approved the final draft.

Data Availability

The following information was supplied regarding data availability:

The data is available at Bitbucket: https://bitbucket.org/oscarvargash/linochilus.

Funding

Financial support was provided by The University of Texas at Austin (Plant Biology Program Awards, the C. L. Lundell Chair of Systematic Botany, The Linda Escobar Award), the Garden Club of America (2012 Award in Tropical Botany), and the Smithsonian Institution (Cuatrecasas Award, 2006). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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