Chemical communication, sexual selection, and introgression in wall lizards

Hannah E.A. MacGregor; Rachel A.M. Lewandowsky; Patrizia d'Ettorre; Chloé Leroy; Noel W. Davies; Geoffrey M. While; Tobias Uller

doi:10.1111/evo.13317

Chemical communication, sexual selection, and introgression in wall lizards

Hannah E.A. MacGregor, Rachel A.M. Lewandowsky, Patrizia d'Ettorre, Chloé Leroy, Noel W. Davies, Geoffrey M. While, Tobias Uller

School of Biological Sciences

Research output: Contribution to journal › Article (Academic Journal) › peer-review

23 Citations (Scopus)

Abstract

Divergence in communication systems should influence the likelihood that individuals from different lineages interbreed, and consequently shape the direction and rate of hybridization. Here, we studied the role of chemical communication in hybridization, and its contribution to asymmetric and sexually selected introgression between two lineages of the common wall lizard (Podarcis muralis). Males of the two lineages differed in the chemical composition of their femoral secretions. Chemical profiles provided information regarding male secondary sexual characters, but the associations were variable and inconsistent between lineages. In experimental contact zones, chemical composition was weakly associated with male reproductive success, and did not predict the likelihood of hybridization. Consistent with these results, introgression of chemical profiles in a natural hybrid zone resembled that of neutral nuclear genetic markers overall, but one compound in particular (tocopherol methyl ether) matched closely the introgression of visual sexual characters. These results imply that associations among male chemical profiles, sexual characters, and reproductive success largely reflect transient and environmentally driven effects, and that genetic divergence in chemical composition is largely neutral. We therefore suggest that femoral secretions in wall lizards primarily provide information about residency and individual identity rather than function as sexual signals.

Original language	English
Pages (from-to)	2327-2343
Number of pages	17
Journal	Evolution
Volume	71
Issue number	10
DOIs	https://doi.org/10.1111/evo.13317
Publication status	Published - Oct 2017

Bibliographical note

Funding Information:
We thank B. Halliwell, J. Barrett, S. Michaelides, N. Zajac, N. Feiner, and L. Kidd for assistance in the field and with experiments, and M. Zuffi, R. Sacchi and F. Aubret for logistical support. We are grateful to W. Yang and B. Reid for assistance with the cline analysis. We also thank D. Stuart-Fox, M. S. Webster and two anonymous reviewers for their helpful comments on earlier versions of this manuscript. Project funding was kindly provided by the Royal Society of London, the British Ecological Society, the National Geographic Society (all to TU) and the Holsworth Wildlife Research Endowment (HEAM). TU was supported by a Royal Society University Research Fellowship and a Wallenberg Academy Fellowship and HEAM by a University of Tasmania Graduate Research Scholarship. All experiments carried out as part of this research comply with U.K. laws and the work was approved by the University of Oxford’s Local Ethical Review Process and the U.K. Home Office (PPL: 30/2560). Fieldwork was carried out under permits from Direction Régionale de l’Environnement, de l’Aménagement et du Logement (nos. 2010/DDEA/SEPR/175, 2010–11, 11/2012, No 2010-DDEA-SE-105, 29/2012, 11/DDTM/657-SERN-NB, and SE-2010-24), Ministero dell’Ambiente e della Tutela del Territorio del Mare—DG Protezione della Natura e del Mare (prot. PNM-2012-2738, prot. 0011511/PNM, prot. PNM-2012-3878, ISRA prot. 14392, 2764/PNM) and Societas Her-petologica Italica (prot. ISPRA 9139 T/-A31).

Publisher Copyright:
© 2017 The Author(s). Evolution © 2017 The Society for the Study of Evolution.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

Femoral pores
hybrid zone
hybridization
olfaction
pheromones

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10.1111/evo.13317

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@article{29e8d44f92b04d9dafd8e31dcc00f559,

title = "Chemical communication, sexual selection, and introgression in wall lizards",

abstract = "Divergence in communication systems should influence the likelihood that individuals from different lineages interbreed, and consequently shape the direction and rate of hybridization. Here, we studied the role of chemical communication in hybridization, and its contribution to asymmetric and sexually selected introgression between two lineages of the common wall lizard (Podarcis muralis). Males of the two lineages differed in the chemical composition of their femoral secretions. Chemical profiles provided information regarding male secondary sexual characters, but the associations were variable and inconsistent between lineages. In experimental contact zones, chemical composition was weakly associated with male reproductive success, and did not predict the likelihood of hybridization. Consistent with these results, introgression of chemical profiles in a natural hybrid zone resembled that of neutral nuclear genetic markers overall, but one compound in particular (tocopherol methyl ether) matched closely the introgression of visual sexual characters. These results imply that associations among male chemical profiles, sexual characters, and reproductive success largely reflect transient and environmentally driven effects, and that genetic divergence in chemical composition is largely neutral. We therefore suggest that femoral secretions in wall lizards primarily provide information about residency and individual identity rather than function as sexual signals.",

keywords = "Femoral pores, hybrid zone, hybridization, olfaction, pheromones",

author = "MacGregor, {Hannah E.A.} and Lewandowsky, {Rachel A.M.} and Patrizia d'Ettorre and Chlo{\'e} Leroy and Davies, {Noel W.} and While, {Geoffrey M.} and Tobias Uller",

note = "Funding Information: We thank B. Halliwell, J. Barrett, S. Michaelides, N. Zajac, N. Feiner, and L. Kidd for assistance in the field and with experiments, and M. Zuffi, R. Sacchi and F. Aubret for logistical support. We are grateful to W. Yang and B. Reid for assistance with the cline analysis. We also thank D. Stuart-Fox, M. S. Webster and two anonymous reviewers for their helpful comments on earlier versions of this manuscript. Project funding was kindly provided by the Royal Society of London, the British Ecological Society, the National Geographic Society (all to TU) and the Holsworth Wildlife Research Endowment (HEAM). TU was supported by a Royal Society University Research Fellowship and a Wallenberg Academy Fellowship and HEAM by a University of Tasmania Graduate Research Scholarship. All experiments carried out as part of this research comply with U.K. laws and the work was approved by the University of Oxford{\textquoteright}s Local Ethical Review Process and the U.K. Home Office (PPL: 30/2560). Fieldwork was carried out under permits from Direction R{\'e}gionale de l{\textquoteright}Environnement, de l{\textquoteright}Am{\'e}nagement et du Logement (nos. 2010/DDEA/SEPR/175, 2010–11, 11/2012, No 2010-DDEA-SE-105, 29/2012, 11/DDTM/657-SERN-NB, and SE-2010-24), Ministero dell{\textquoteright}Ambiente e della Tutela del Territorio del Mare—DG Protezione della Natura e del Mare (prot. PNM-2012-2738, prot. 0011511/PNM, prot. PNM-2012-3878, ISRA prot. 14392, 2764/PNM) and Societas Her-petologica Italica (prot. ISPRA 9139 T/-A31). Publisher Copyright: {\textcopyright} 2017 The Author(s). Evolution {\textcopyright} 2017 The Society for the Study of Evolution. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

year = "2017",

month = oct,

doi = "10.1111/evo.13317",

language = "English",

volume = "71",

pages = "2327--2343",

journal = "Evolution",

issn = "0014-3820",

publisher = "Society for the Study of Evolution",

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TY - JOUR

T1 - Chemical communication, sexual selection, and introgression in wall lizards

AU - MacGregor, Hannah E.A.

AU - Lewandowsky, Rachel A.M.

AU - d'Ettorre, Patrizia

AU - Leroy, Chloé

AU - Davies, Noel W.

AU - While, Geoffrey M.

AU - Uller, Tobias

N1 - Funding Information: We thank B. Halliwell, J. Barrett, S. Michaelides, N. Zajac, N. Feiner, and L. Kidd for assistance in the field and with experiments, and M. Zuffi, R. Sacchi and F. Aubret for logistical support. We are grateful to W. Yang and B. Reid for assistance with the cline analysis. We also thank D. Stuart-Fox, M. S. Webster and two anonymous reviewers for their helpful comments on earlier versions of this manuscript. Project funding was kindly provided by the Royal Society of London, the British Ecological Society, the National Geographic Society (all to TU) and the Holsworth Wildlife Research Endowment (HEAM). TU was supported by a Royal Society University Research Fellowship and a Wallenberg Academy Fellowship and HEAM by a University of Tasmania Graduate Research Scholarship. All experiments carried out as part of this research comply with U.K. laws and the work was approved by the University of Oxford’s Local Ethical Review Process and the U.K. Home Office (PPL: 30/2560). Fieldwork was carried out under permits from Direction Régionale de l’Environnement, de l’Aménagement et du Logement (nos. 2010/DDEA/SEPR/175, 2010–11, 11/2012, No 2010-DDEA-SE-105, 29/2012, 11/DDTM/657-SERN-NB, and SE-2010-24), Ministero dell’Ambiente e della Tutela del Territorio del Mare—DG Protezione della Natura e del Mare (prot. PNM-2012-2738, prot. 0011511/PNM, prot. PNM-2012-3878, ISRA prot. 14392, 2764/PNM) and Societas Her-petologica Italica (prot. ISPRA 9139 T/-A31). Publisher Copyright: © 2017 The Author(s). Evolution © 2017 The Society for the Study of Evolution. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2017/10

Y1 - 2017/10

N2 - Divergence in communication systems should influence the likelihood that individuals from different lineages interbreed, and consequently shape the direction and rate of hybridization. Here, we studied the role of chemical communication in hybridization, and its contribution to asymmetric and sexually selected introgression between two lineages of the common wall lizard (Podarcis muralis). Males of the two lineages differed in the chemical composition of their femoral secretions. Chemical profiles provided information regarding male secondary sexual characters, but the associations were variable and inconsistent between lineages. In experimental contact zones, chemical composition was weakly associated with male reproductive success, and did not predict the likelihood of hybridization. Consistent with these results, introgression of chemical profiles in a natural hybrid zone resembled that of neutral nuclear genetic markers overall, but one compound in particular (tocopherol methyl ether) matched closely the introgression of visual sexual characters. These results imply that associations among male chemical profiles, sexual characters, and reproductive success largely reflect transient and environmentally driven effects, and that genetic divergence in chemical composition is largely neutral. We therefore suggest that femoral secretions in wall lizards primarily provide information about residency and individual identity rather than function as sexual signals.

AB - Divergence in communication systems should influence the likelihood that individuals from different lineages interbreed, and consequently shape the direction and rate of hybridization. Here, we studied the role of chemical communication in hybridization, and its contribution to asymmetric and sexually selected introgression between two lineages of the common wall lizard (Podarcis muralis). Males of the two lineages differed in the chemical composition of their femoral secretions. Chemical profiles provided information regarding male secondary sexual characters, but the associations were variable and inconsistent between lineages. In experimental contact zones, chemical composition was weakly associated with male reproductive success, and did not predict the likelihood of hybridization. Consistent with these results, introgression of chemical profiles in a natural hybrid zone resembled that of neutral nuclear genetic markers overall, but one compound in particular (tocopherol methyl ether) matched closely the introgression of visual sexual characters. These results imply that associations among male chemical profiles, sexual characters, and reproductive success largely reflect transient and environmentally driven effects, and that genetic divergence in chemical composition is largely neutral. We therefore suggest that femoral secretions in wall lizards primarily provide information about residency and individual identity rather than function as sexual signals.

KW - Femoral pores

KW - hybrid zone

KW - hybridization

KW - olfaction

KW - pheromones

UR - http://www.scopus.com/inward/record.url?scp=85029352945&partnerID=8YFLogxK

U2 - 10.1111/evo.13317

DO - 10.1111/evo.13317

M3 - Article (Academic Journal)

C2 - 28745028

AN - SCOPUS:85029352945

SN - 0014-3820

VL - 71

SP - 2327

EP - 2343

JO - Evolution

JF - Evolution

IS - 10

ER -

Chemical communication, sexual selection, and introgression in wall lizards

Abstract

Bibliographical note

Keywords

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