Adaptive zones shape the magnitude of premating reproductive isolation in Timema stick insects

Muschick, Moritz; Soria-Carrasco, Víctor; Feder, Jeffrey L.; Gompert, Zach; Nosil, Patrik (2020). Adaptive zones shape the magnitude of premating reproductive isolation in Timema stick insects. Philosophical Transactions of the Royal Society B: Biological Sciences, 375(1806), p. 20190541. 10.1098/rstb.2019.0541

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Simpson’s fossil-record inspired model of ‘adaptive zones’ proposes that evolution
is dominated by small fluctuations within adaptive zones, occasionally
punctuated by larger shifts between zones. This model can help explain why
the process of population divergence often results in weak or moderate reproductive
isolation (RI), rather than strong RI and distinct species. Applied to
the speciation process, the adaptive zones hypothesis makes two inter-related
predictions: (i) large shifts between zones are relatively rare, (ii) when large
shifts do occur they generate stronger RI than shifts within zones. Here, we
use ecological, phylogenetic and behavioural data to test these predictions
in Timema stick insects. We show that host use in Timema is dominated by
moderate shifts within the systematic divisions of flowering plants and conifers,
with only a few extreme shifts between these divisions. However, when
extreme shifts occur, they generate greater RI than do more moderate shifts.
Our results support the adaptive zones model, and suggest that the net contribution
of ecological shifts to diversification is dependent on both their
magnitude and frequency. We discuss the generality of our findings in the
light of emerging evidence from diverse taxa that the evolution of RI is not
always the only factor determining the origin of species diversity.
This article is part of the theme issue ‘Towards the completion of speciation:
the evolution of reproductive isolation beyond the first barriers’.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology

UniBE Contributor:

Muschick, Moritz

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

0962-8436

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

15 Jul 2020 09:28

Last Modified:

01 Aug 2020 18:55

Publisher DOI:

10.1098/rstb.2019.0541

BORIS DOI:

10.7892/boris.145203

URI:

https://boris.unibe.ch/id/eprint/145203

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