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On the Ecology and Evolution of seed and Bud Dormancy

Nilsson, Patric LU (1997)
Abstract
This thesis considers the ecological and evolutionary significance of seed and bud dormancy. First, I present theoretical support to the idea that seed dormancy may evolve as a strategy to reduce sib competition in temporally homogeneous environments. In this thesis, I also analyze two different processes that may give rise to parent-offspring conflicts in angiosperms, viz. seed germination and seed provisioning. In either case, I use a single fitness function for a single individual, whereas in earlier contributions fitness for parents and offspring are given distinct definitions. I show that there exists an ESS, and that this ESS is best seen as a compromise between conflicting selection pressures acting upon genes with age-specific... (More)
This thesis considers the ecological and evolutionary significance of seed and bud dormancy. First, I present theoretical support to the idea that seed dormancy may evolve as a strategy to reduce sib competition in temporally homogeneous environments. In this thesis, I also analyze two different processes that may give rise to parent-offspring conflicts in angiosperms, viz. seed germination and seed provisioning. In either case, I use a single fitness function for a single individual, whereas in earlier contributions fitness for parents and offspring are given distinct definitions. I show that there exists an ESS, and that this ESS is best seen as a compromise between conflicting selection pressures acting upon genes with age-specific expression rather than as a conflcit between parents and offspring. Second, I outline a theoretical framework for the evolution of bud dormancy as an adaptation to a predictable risk of being damaged. The presence of dormant buds/latent meristems enables plants to compensate their meristem losses following damage by the regrowth of secondary and tertiary shoots. I show that intensive and predictable herbivory may select for compensatory growth in plants. An interesting result of the present thesis is that the shape of compensatory responses in relation to meristem loss differs between qualitatively between plants adapted to single grazing episode and plants adapted to repeated grazing events. Finally, I present empirical evidence for an evolutionary history of overcompensation in the herb Gentianella campestris (Gentianaceae). BY overcompensation, I undestand the fact that damaged plants produce more fruits and seeds than do undamaged plants. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Dr Oksanen, Lauri, University of Umeå
organization
publishing date
type
Thesis
publication status
published
subject
keywords
bet-hedging, overcompensation, herbivory, plant compensatory growth, bud dormancy, endosperm, seed provisioning, Seed dormancy, parent-offspring conflicts, Ecology, Ekologi, Botany, Botanik
pages
140 pages
publisher
Theoretical Ecology, Ecolgy Building, Lund University
defense location
Blå hallen, Ekologihuset
defense date
1997-05-09 10:15
external identifiers
  • other:ISRN: LUNDBDS/NBTE--97/1007--SE
ISBN
91-7105-084-1
language
English
LU publication?
yes
id
2a531ce7-aef3-44de-b9b9-e8b1ef66ad08 (old id 29198)
date added to LUP
2007-06-12 15:30:38
date last changed
2016-09-19 08:45:05
@phdthesis{2a531ce7-aef3-44de-b9b9-e8b1ef66ad08,
  abstract     = {This thesis considers the ecological and evolutionary significance of seed and bud dormancy. First, I present theoretical support to the idea that seed dormancy may evolve as a strategy to reduce sib competition in temporally homogeneous environments. In this thesis, I also analyze two different processes that may give rise to parent-offspring conflicts in angiosperms, viz. seed germination and seed provisioning. In either case, I use a single fitness function for a single individual, whereas in earlier contributions fitness for parents and offspring are given distinct definitions. I show that there exists an ESS, and that this ESS is best seen as a compromise between conflicting selection pressures acting upon genes with age-specific expression rather than as a conflcit between parents and offspring. Second, I outline a theoretical framework for the evolution of bud dormancy as an adaptation to a predictable risk of being damaged. The presence of dormant buds/latent meristems enables plants to compensate their meristem losses following damage by the regrowth of secondary and tertiary shoots. I show that intensive and predictable herbivory may select for compensatory growth in plants. An interesting result of the present thesis is that the shape of compensatory responses in relation to meristem loss differs between qualitatively between plants adapted to single grazing episode and plants adapted to repeated grazing events. Finally, I present empirical evidence for an evolutionary history of overcompensation in the herb Gentianella campestris (Gentianaceae). BY overcompensation, I undestand the fact that damaged plants produce more fruits and seeds than do undamaged plants.},
  author       = {Nilsson, Patric},
  isbn         = {91-7105-084-1},
  keyword      = {bet-hedging,overcompensation,herbivory,plant compensatory growth,bud dormancy,endosperm,seed provisioning,Seed dormancy,parent-offspring conflicts,Ecology,Ekologi,Botany,Botanik},
  language     = {eng},
  pages        = {140},
  publisher    = {Theoretical Ecology, Ecolgy Building, Lund University},
  school       = {Lund University},
  title        = {On the Ecology and Evolution of seed and Bud Dormancy},
  year         = {1997},
}