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Recruitment advantage of large seeds is greater in shaded habitats

Bruun, Hans Henrik LU and ten Brink, Dirk-Jan LU (2008) In Écoscience 15(4). p.498-507
Abstract
Large seeds are assumed to have higher probability of successful recruitment than small seeds. This is because larger seeds give rise to larger seedlings and larger seedlings better withstand environmental hazards like deep shade and drought. Biotic and abiotic limitations to seedling growth and survival, and conversely availability of safe sites for recruitment, vary along environmental gradients and between habitat types. Thus, the value to plant species of possessing large seeds may differ between plant communities. We analyzed the relationship between seed mass and per-seed recruitment success (seedlings established per number of seeds produced) along an environmental gradient from open grassland to closed-canopy forest using data... (More)
Large seeds are assumed to have higher probability of successful recruitment than small seeds. This is because larger seeds give rise to larger seedlings and larger seedlings better withstand environmental hazards like deep shade and drought. Biotic and abiotic limitations to seedling growth and survival, and conversely availability of safe sites for recruitment, vary along environmental gradients and between habitat types. Thus, the value to plant species of possessing large seeds may differ between plant communities. We analyzed the relationship between seed mass and per-seed recruitment success (seedlings established per number of seeds produced) along an environmental gradient from open grassland to closed-canopy forest using data collected by Uuno Perttula in southern Finland in 1934. We found that larger seeds have greater recruitment success relative to smaller seeds in all investigated communities. However, the recruitment success of large seeds relative to small seeds strongly increased from grassland and open forest to closed-canopy forest. Of the measured environmental variables, canopy closure most strongly explained this increase. This indicates a strong direct effect of deep shade on seedling survival in natural plant communities. Additional explanatory power was associated with soil moisture. Litter cover, moss cover, and soil pH did not contribute to explaining the variation in relative recruitment success of larger seeds. Thus, the advantage of large seeds in recruitment success is pronounced in deeply shaded forest but may be insignificant in open vegetation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Écoscience
volume
15
issue
4
pages
498 - 507
publisher
Université Laval
external identifiers
  • wos:000261940600010
  • scopus:58149218221
ISSN
1195-6860
DOI
10.2980/15-4-3147
language
English
LU publication?
yes
id
f86b4955-d245-484b-a884-9a0a05bd68d8 (old id 1277137)
date added to LUP
2009-06-18 12:55:51
date last changed
2017-01-01 05:51:56
@article{f86b4955-d245-484b-a884-9a0a05bd68d8,
  abstract     = {Large seeds are assumed to have higher probability of successful recruitment than small seeds. This is because larger seeds give rise to larger seedlings and larger seedlings better withstand environmental hazards like deep shade and drought. Biotic and abiotic limitations to seedling growth and survival, and conversely availability of safe sites for recruitment, vary along environmental gradients and between habitat types. Thus, the value to plant species of possessing large seeds may differ between plant communities. We analyzed the relationship between seed mass and per-seed recruitment success (seedlings established per number of seeds produced) along an environmental gradient from open grassland to closed-canopy forest using data collected by Uuno Perttula in southern Finland in 1934. We found that larger seeds have greater recruitment success relative to smaller seeds in all investigated communities. However, the recruitment success of large seeds relative to small seeds strongly increased from grassland and open forest to closed-canopy forest. Of the measured environmental variables, canopy closure most strongly explained this increase. This indicates a strong direct effect of deep shade on seedling survival in natural plant communities. Additional explanatory power was associated with soil moisture. Litter cover, moss cover, and soil pH did not contribute to explaining the variation in relative recruitment success of larger seeds. Thus, the advantage of large seeds in recruitment success is pronounced in deeply shaded forest but may be insignificant in open vegetation.},
  author       = {Bruun, Hans Henrik and ten Brink, Dirk-Jan},
  issn         = {1195-6860},
  language     = {eng},
  number       = {4},
  pages        = {498--507},
  publisher    = {Université Laval},
  series       = {Écoscience},
  title        = {Recruitment advantage of large seeds is greater in shaded habitats},
  url          = {http://dx.doi.org/10.2980/15-4-3147},
  volume       = {15},
  year         = {2008},
}