Landscape genomic insights into the historic migration of mountain hemlock in response to Holocene climate change

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.3732/ajb.1600262

Ключевые слова: ddRAD, genotyping-by-sequencing, isolation by resistance, landscape genetics, long distance dispersal, microrefugia, Pinaceae, Pleistocene, Tsuga mertensiana

Аннотация: PREMISE OF THE STUDY: Untangling alternative historic dispersal pathways in long-lived tree species is critical to better understand how temperate tree species may respond to climatic change. However, disentangling these alternative pathways is often difficult. Emerging genomic technologies and landscape genetics techniques improve our ability to assess these pathways in natural systems. We address the question to what degree have microrefugial patches and long-distance dispersal been responsible for the colonization of mountain hemlock (Tsuga mertensiana) on the Alaskan Kenai Peninsula. METHODS: We used double-digest restriction-associated DNA sequencing (ddRADseq) to identify genetic variants across eight mountain hemlock sample sites on the Kenai Peninsula, Alaska. We assessed genetic diversity and linkage disequilibrium using landscape and population genetics approaches. Alternative historic dispersal pathways were assessed using discriminant analysis of principle components and electrical circuit theory. KEY RESULTS: A combination of decreasing diversity, high gene flow, and landscape connectivity indicates that mountain hemlock colonization on the Kenai Peninsula is the result of long-distance dispersal. We found that contemporary climate best explained gene flow patterns and that isolation by resistance was a better model explaining genetic variation than isolation by distance. CONCLUSIONS: Our findings support the conclusion that mountain hemlock colonization is the result of several long-distance dispersal events following Pleistocene glaciation. The high dispersal capability suggests that mountain hemlock may be able to respond to future climate change and expand its range as new habitat opens along its northern distribution.

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Издание

Журнал: AMERICAN JOURNAL OF BOTANY

Выпуск журнала: Vol. 104, Is. 3

Номера страниц: 439-450

ISSN журнала: 00029122

Место издания: ST LOUIS

Издатель: BOTANICAL SOC AMER INC

Авторы

  • Johnson Jeremy S. (Texas A&M Univ, Dept Geog, 810 Eller O&M Bldg,MS 3147, College Stn, TX 77843 USA)
  • Gaddis Keith D. (Texas A&M Univ, Dept Geog, 810 Eller O&M Bldg,MS 3147, College Stn, TX 77843 USA)
  • Cairns David M. (Texas A&M Univ, Dept Geog, 810 Eller O&M Bldg,MS 3147, College Stn, TX 77843 USA)
  • Konganti Kranti (Texas A&M Univ, Texas A&M Inst Genome Sci & Soc, Vet Med Res Bldg,MS 2470, College Stn, TX 77433 USA)
  • Krutovsky Konstantin V. (Georg August Univ Gottingen, Dept Forest Genet & Tree Breeding, Busgenweg 2, D-37077 Gottingen, Germany; Texas A&M Univ, Dept Ecosyst Sci & Management, 305 Hort & Forest Sci Bldg,MS 2138 TAMU, College Stn, TX 77843 USA; Russian Acad Sci, NI Vavilov Inst Gen Genet, 3 Gubkina Str, Moscow 119333, Russia; Siberian Fed Univ, Genome Res & Educ Ctr, 50a-2 Akademgorodok, Krasnoyarsk 660036, Russia)

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