Seed dispersal at alpine treeline: An assessment of seed movement within the alpine treeline ecotone

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1002/ecs2.1649

Ключевые слова: Alpine treeline ecotone, Dispersal, Double-digest restriction-associated DNA, Genotyping-by-sequencing, Mountain hemlock, Parentage analysis, Seed immigration

Аннотация: Alpine treelines are expected to advance to higher elevations in conjunction with global warming. Nevertheless, the importance of treeline reproductive patterns and seed dispersal within the alpine treeline ecotone remains unresolved. In this study, we address two research questions at mountain hemlock treelines on the Kenai Peninsula, Alaska: (1) What is the primary mode of reproduction and (2) are seeds leading to recruitment derived from within the local treeline populations or are they arriving from more distant seed sources? To answer these questions, we exhaustively sampled mountain hemlock individuals along a single mountain slope, and genotyped single nucleotide polymorphisms using doubledigest restriction site-associated DNA sequencing. First, we assessed mode of reproduction by determining the proportion of sampled individuals with identical multilocus genotypes that are the product of clonal reproduction. Second, we used a categorical parentage analysis to identify parent-offspring pairs, so that the proportion of treeline reproduction events could be spatially quantified and dispersal distance measured. We identified sexual reproduction as the primary mode of reproduction at our study site. Seedling establishment was characterized by extensive seed immigration and gene flow into the ecotone. The average dispersal distance was 73 m with long-distance dispersal identified as dispersal occurring at distances greater than 450 m. We found that production of seeds within the alpine treeline ecotone is not necessarily a requirement for treelines to advance to higher elevations in response to climate change. The extensive seed dispersal and gene flow into the alpine treeline ecotone is likely sufficient to propel the ecotone higher under more favorable climate. © 2017 Johnson et al.

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Издание

Журнал: Ecosphere

Выпуск журнала: Vol. 8, Is. 1

ISSN журнала: 21508925

Авторы

  • Johnson J.S. (Department of Geography, Texas AandM University, 810 Eller OandM Building, MS 3147 TAMU, College Station, TX, United StatesGaddis, K.D., Department of Geography, Texas AandM University, 810 Eller OandM Building, MS 3147 TAMU, College Station, TX, United StatesCairns, D.M., Department of Geography, Texas AandM University, 810 Eller OandM Building, MS 3147 TAMU, College Station, TX, United StatesKrutovsky, K.V., Department of Forest Genetics and Tree Breeding, Georg-August University of G?ttingen, B?sgenweg 2, G?ttingen, Germany, Department of Ecosystem Science and Management, Texas AandM University, 305 Horticulture and Forest Science Building,)
  • Gaddis K.D. (Department of Geography, Texas AandM University, 810 Eller OandM Building, MS 3147 TAMU, College Station, TX, United States)
  • Cairns D.M. (Department of Geography, Texas AandM University, 810 Eller OandM Building, MS 3147 TAMU, College Station, TX, United States)
  • Krutovsky K.V. (Department of Forest Genetics and Tree Breeding, Georg-August University of G?ttingen, B?sgenweg 2, G?ttingen, Germany, Department of Ecosystem Science and Management, Texas AandM University, 305 Horticulture and Forest Science Building,)

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