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Open AccessArticle

The Role of Plasticity and Adaptation in the Incipient Speciation of a Fire Salamander Population

1
Department of Evolutionary Biology, Zoological Institute, Technische Universität Braunschweig, 38106 Braunschweig, Germany
2
Department of Biology, Stanford University, Stanford, CA 94305, USA
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Laboratory of Aquatic Ecology and Evolutionary Biology, KU Leuven, 3000 Leuven, Belgium
4
Department of Ecological Genomics, Institute for Biology and Environmental Sciences, University of Oldenburg, 26129 Oldenburg, Germany
5
University of Leipzig, Institute of Biology, Molecular Evolution and Systematics of Animals, 04103 Leipzig, Germany
*
Authors to whom correspondence should be addressed.
Genes 2019, 10(11), 875; https://doi.org/10.3390/genes10110875
Received: 31 August 2019 / Revised: 18 October 2019 / Accepted: 28 October 2019 / Published: 31 October 2019
(This article belongs to the Special Issue Evolutionary Genetics of Reptiles and Amphibians)
Phenotypic plasticity and local adaptation via genetic change are two major mechanisms of response to dynamic environmental conditions. These mechanisms are not mutually exclusive, since genetic change can establish similar phenotypes to plasticity. This connection between both mechanisms raises the question of how much of the variation observed between species or populations is plastic and how much of it is genetic. In this study, we used a structured population of fire salamanders (Salamandra salamandra), in which two subpopulations differ in terms of physiology, genetics, mate-, and habitat preferences. Our goal was to identify candidate genes for differential habitat adaptation in this system, and to explore the degree of plasticity compared to local adaptation. We therefore performed a reciprocal transfer experiment of stream- and pond-originated salamander larvae and analyzed changes in morphology and transcriptomic profile (using species-specific microarrays). We observed that stream- and pond-originated individuals diverge in morphology and gene expression. For instance, pond-originated larvae have larger gills, likely to cope with oxygen-poor ponds. When transferred to streams, pond-originated larvae showed a high degree of plasticity, resembling the morphology and gene expression of stream-originated larvae (reversion); however the same was not found for stream-originated larvae when transferred to ponds, where the expression of genes related to reduction-oxidation processes was increased, possibly to cope with environmental stress. The lack of symmetrical responses between transplanted animals highlights the fact that the adaptations are not fully plastic and that some level of local adaptation has already occurred in this population. This study illuminates the process by which phenotypic plasticity allows local adaptation to new environments and its potential role in the pathway of incipient speciation. View Full-Text
Keywords: acclimatization; transplant experiment; phenotypic plasticity; local adaptation; transcriptomics acclimatization; transplant experiment; phenotypic plasticity; local adaptation; transcriptomics
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MDPI and ACS Style

Sabino-Pinto, J.; Goedbloed, D.J.; Sanchez, E.; Czypionka, T.; Nolte, A.W.; Steinfartz, S. The Role of Plasticity and Adaptation in the Incipient Speciation of a Fire Salamander Population. Genes 2019, 10, 875.

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