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Climatic niche evolution is faster in sympatric than allopatric lineages of the butterfly genus Pyrgus

C. Pitteloud, N. Arrigo, T. Suchan, A. Mastretta-Yanes, R. Vila, V. Dincă, J. Hernández-Roldán, E. Brockmann, Y. Chittaro, I. Kleckova, L. Fumagalli, S. Buerki, L. Pellissier, N. Alvarez,

. 2017 ; 284 (1852) : .

Language English Country England, Great Britain

Document type Journal Article

Persistent link   https://www.medvik.cz/link/bmc17030885

Understanding how speciation relates to ecological divergence has long fascinated biologists. It is assumed that ecological divergence is essential to sympatric speciation, as a mechanism to avoid competition and eventually lead to reproductive isolation, while divergence in allopatry is not necessarily associated with niche differentiation. The impact of the spatial context of divergence on the evolutionary rates of abiotic dimensions of the ecological niche has rarely been explored for an entire clade. Here, we compare the magnitude of climatic niche shifts between sympatric versus allopatric divergence of lineages in butterflies. By combining next-generation sequencing, parametric biogeography and ecological niche analyses applied to a genus-wide phylogeny of Palaearctic Pyrgus butterflies, we compare evolutionary rates along eight climatic dimensions across sister lineages that diverged in large-scale sympatry versus allopatry. In order to examine the possible effects of the spatial scale at which sympatry is defined, we considered three sets of biogeographic assignments, ranging from narrow to broad definition. Our findings suggest higher rates of niche evolution along all climatic dimensions for sister lineages that diverge in sympatry, when using a narrow delineation of biogeographic areas. This result contrasts with significantly lower rates of climatic niche evolution found in cases of allopatric speciation, despite the biogeographic regions defined here being characterized by significantly different climates. Higher rates in allopatry are retrieved when biogeographic areas are too widely defined-in such a case allopatric events may be recorded as sympatric. Our results reveal the macro-evolutionary significance of abiotic niche differentiation involved in speciation processes within biogeographic regions, and illustrate the importance of the spatial scale chosen to define areas when applying parametric biogeographic analyses.

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$a Pitteloud, Camille $u Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland camille.pitteloud@usys.ethz.ch. Institute of Terrestrial Ecosystems, ETH Zürich, Zurich, Switzerland. Swiss Federal Research Institute WSL, Birmensdorf, Switzerland.
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$a Climatic niche evolution is faster in sympatric than allopatric lineages of the butterfly genus Pyrgus / $c C. Pitteloud, N. Arrigo, T. Suchan, A. Mastretta-Yanes, R. Vila, V. Dincă, J. Hernández-Roldán, E. Brockmann, Y. Chittaro, I. Kleckova, L. Fumagalli, S. Buerki, L. Pellissier, N. Alvarez,
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$a Understanding how speciation relates to ecological divergence has long fascinated biologists. It is assumed that ecological divergence is essential to sympatric speciation, as a mechanism to avoid competition and eventually lead to reproductive isolation, while divergence in allopatry is not necessarily associated with niche differentiation. The impact of the spatial context of divergence on the evolutionary rates of abiotic dimensions of the ecological niche has rarely been explored for an entire clade. Here, we compare the magnitude of climatic niche shifts between sympatric versus allopatric divergence of lineages in butterflies. By combining next-generation sequencing, parametric biogeography and ecological niche analyses applied to a genus-wide phylogeny of Palaearctic Pyrgus butterflies, we compare evolutionary rates along eight climatic dimensions across sister lineages that diverged in large-scale sympatry versus allopatry. In order to examine the possible effects of the spatial scale at which sympatry is defined, we considered three sets of biogeographic assignments, ranging from narrow to broad definition. Our findings suggest higher rates of niche evolution along all climatic dimensions for sister lineages that diverge in sympatry, when using a narrow delineation of biogeographic areas. This result contrasts with significantly lower rates of climatic niche evolution found in cases of allopatric speciation, despite the biogeographic regions defined here being characterized by significantly different climates. Higher rates in allopatry are retrieved when biogeographic areas are too widely defined-in such a case allopatric events may be recorded as sympatric. Our results reveal the macro-evolutionary significance of abiotic niche differentiation involved in speciation processes within biogeographic regions, and illustrate the importance of the spatial scale chosen to define areas when applying parametric biogeographic analyses.
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$a Arrigo, Nils $u Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland. $7 gn_A_00008882
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$a Suchan, Tomasz $u Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland. W. Szafer Institute of Botany, Polish Academy of Sciences, Kraków, Poland.
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$a Mastretta-Yanes, Alicia $u CONACYT Research Fellow assigned to CONABIO, Comisión Nacional para el conocimiento y uso de la Biodiversidad, Mexico City, Mexico.
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$a Vila, Roger $u Institute of Evolutionary Biology, CSIC-Universitat Pompeu Fabra, Barcelona, Spain.
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$a Dincă, Vlad $u Institute of Evolutionary Biology, CSIC-Universitat Pompeu Fabra, Barcelona, Spain. Center for Biodiversity Genomics, Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, Canada.
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$a Hernández-Roldán, Juan $u Institute of Evolutionary Biology, CSIC-Universitat Pompeu Fabra, Barcelona, Spain. Departamento de Biología, Universidad Autónoma de Madrid, Madrid, Spain.
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$a Brockmann, Ernst $u Laubacher Str. 4, Lich, Hessen, Germany.
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$a Chittaro, Yannick $u Centre Suisse de Cartographie de la Faune, Neuchâtel, Switzerland.
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$a Kleckova, Irena $u Biology Centre of the Czech Academy of Sciences, Ceske Budejovice, Czech Republic.
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$a Fumagalli, Luca $u Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland.
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$a Buerki, Sven $u Department of Life Sciences, Natural History Museum, Cromwell Road, London, UK.
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$a Pellissier, Loïc $u Institute of Terrestrial Ecosystems, ETH Zürich, Zurich, Switzerland. Swiss Federal Research Institute WSL, Birmensdorf, Switzerland.
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$a Alvarez, Nadir $u Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland nadir.alvarez@unil.ch. $7 gn_A_00005109
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