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Seed dispersal capacity of Salix caprea L. assessed by seed trapping and parentage analysis

Authors
  • Tiebel, Katharina1
  • Leinemann, Ludger2
  • Hosius, Bernhard2
  • Schlicht, Robert3
  • Frischbier, Nico4
  • Wagner, Sven1
  • 1 TU Dresden, Chair of Silviculture, Institute of Silviculture and Forest Protection, Tharandt, 01737, Germany , Tharandt (Germany)
  • 2 ISOGEN, Institute of Genetics and Forest Tree Breeding, Büsgenweg 2, Göttingen, 37077, Germany , Göttingen (Germany)
  • 3 TU Dresden, Chair of Forest Biometrics and Forest Systems Analysis, Institute of Forest Growth and Forest Computer Sciences, Tharandt, 01737, Germany , Tharandt (Germany)
  • 4 Thüringen Forst, Forestry Research and Competence Center, Jägerstraße 1, Gotha, 99867, Germany , Gotha (Germany)
Type
Published Article
Journal
European Journal of Forest Research
Publisher
Springer Berlin Heidelberg
Publication Date
Mar 14, 2019
Volume
138
Issue
3
Pages
495–511
Identifiers
DOI: 10.1007/s10342-019-01186-2
Source
Springer Nature
Keywords
License
Yellow

Abstract

The natural regeneration of Salix caprea L. in disturbed forest areas is an important ecological phenomenon occurring during succession in temperate and boreal forests. Knowledge of the timing and extent of seed dispersal in goat willow is still rudimentary. We studied seed dispersal and genetic offspring relationships on five storm-disturbed forest sites (4–13 ha) at 715–900 m a.s.l. in the spruce-dominated Thuringian Forest over a 2-year period. The duration of the seed rain was 3 months in 2015, and only 6 weeks in spring 2016. The seed dispersal curve resembled a negative exponential function with a steep slope. The highest seed numbers of 23–156 n per trap occurred close to the base of the seed trees. Farther than 350 m from the seed trees, average numbers of 0.6–2.1 seeds per trap were recorded independent of dispersal distance, inclination, the number of seed sources and the dispersal direction. Trapped seed numbers at the study sites were quite similar within a given year, but differed significantly between years. Parentage analyses were carried out at one of the five study sites. One hundred saplings and all of the 20 potential parent trees located within a search zone distance of 500 m from the edge of the open area were analysed. Twenty-nine per cent of the saplings were assigned to one of the 20 parent trees. The longest confirmed seed dispersal distance was up to 800 m. Saplings showed a higher allelic variation than the 20 parent trees, therefore indicating external gene flow as well as long seed and pollen dispersal distances.

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