Within-island speciation with an exceptional case of distinct separation between two sibling lizard species divided by a narrow stream

Shu Ping Tseng, Chao Jun Wang, Shou Hsien Li, Si Min Lin

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Delimitation of genetic and geographic boundaries between species is a focus of evolutionary biology. In this study, we demonstrated fine-scale differentiation of Takydromus formosanus species complex comprising four insular endemics on Taiwan Island. Phylogeny and ancestral range reconstruction based on mitochondrial DNA sequences of 430 Takydromus lizards (405 lizards of this complex throughout their distribution range, and 25 lizards from 11 other species) indicated that the major branching process occurred within Taiwan, which represented a solid evidence of within-island speciation on this small island. We further demonstrated an exceptional case of a pair of sister species, T. viridipunctatus and T. luyeanus, that were separated by a narrow stream with a width of only 15. m. This pattern might be one of the narrowest contact zones ever documented in terrestrial vertebrates. To evaluate the level of genetic introgression between these sister species, a fine-scale collection of another 382 lizards was conducted along a transect line across the stream. A total of 13 microsatellite markers and mtDNA genotyping was used to detect a low proportion of hybrids (5.7-9.9% from STRUCTURE, and 2.3% from DAPC). Our results indicated that the two clades are highly differentiated across this extremely short distance.

Original languageEnglish
Pages (from-to)164-175
Number of pages12
JournalMolecular Phylogenetics and Evolution
Volume90
DOIs
Publication statusPublished - 2015 Sep 1

Fingerprint

Lizards
Islands
lizard
lizards
Mitochondrial DNA
Taiwan
mitochondrial DNA
line transect
contact zone
evolutionary biology
introgression
species complex
Phylogeny
Microsatellite Repeats
genotyping
Vertebrates
branching
vertebrate
phylogeny
vertebrates

Keywords

  • Ancestral range reconstruction
  • Contact zone
  • Fine-scale differentiation
  • Genetic introgression
  • Hybridisation
  • Parapatric speciation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

Cite this

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title = "Within-island speciation with an exceptional case of distinct separation between two sibling lizard species divided by a narrow stream",
abstract = "Delimitation of genetic and geographic boundaries between species is a focus of evolutionary biology. In this study, we demonstrated fine-scale differentiation of Takydromus formosanus species complex comprising four insular endemics on Taiwan Island. Phylogeny and ancestral range reconstruction based on mitochondrial DNA sequences of 430 Takydromus lizards (405 lizards of this complex throughout their distribution range, and 25 lizards from 11 other species) indicated that the major branching process occurred within Taiwan, which represented a solid evidence of within-island speciation on this small island. We further demonstrated an exceptional case of a pair of sister species, T. viridipunctatus and T. luyeanus, that were separated by a narrow stream with a width of only 15. m. This pattern might be one of the narrowest contact zones ever documented in terrestrial vertebrates. To evaluate the level of genetic introgression between these sister species, a fine-scale collection of another 382 lizards was conducted along a transect line across the stream. A total of 13 microsatellite markers and mtDNA genotyping was used to detect a low proportion of hybrids (5.7-9.9{\%} from STRUCTURE, and 2.3{\%} from DAPC). Our results indicated that the two clades are highly differentiated across this extremely short distance.",
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T1 - Within-island speciation with an exceptional case of distinct separation between two sibling lizard species divided by a narrow stream

AU - Tseng, Shu Ping

AU - Wang, Chao Jun

AU - Li, Shou Hsien

AU - Lin, Si Min

PY - 2015/9/1

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AB - Delimitation of genetic and geographic boundaries between species is a focus of evolutionary biology. In this study, we demonstrated fine-scale differentiation of Takydromus formosanus species complex comprising four insular endemics on Taiwan Island. Phylogeny and ancestral range reconstruction based on mitochondrial DNA sequences of 430 Takydromus lizards (405 lizards of this complex throughout their distribution range, and 25 lizards from 11 other species) indicated that the major branching process occurred within Taiwan, which represented a solid evidence of within-island speciation on this small island. We further demonstrated an exceptional case of a pair of sister species, T. viridipunctatus and T. luyeanus, that were separated by a narrow stream with a width of only 15. m. This pattern might be one of the narrowest contact zones ever documented in terrestrial vertebrates. To evaluate the level of genetic introgression between these sister species, a fine-scale collection of another 382 lizards was conducted along a transect line across the stream. A total of 13 microsatellite markers and mtDNA genotyping was used to detect a low proportion of hybrids (5.7-9.9% from STRUCTURE, and 2.3% from DAPC). Our results indicated that the two clades are highly differentiated across this extremely short distance.

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