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The effect of inbreeding on fluctuating asymmetry in Scabiosa canescens (Dipsacaceae)

Waldmann, P (2001) In Evolutionary Ecology 15(2). p.117-127
Abstract
Developmental instability and fluctuating asymmetry (FA) describe the inability of organisms to correct for random accidents under development and has become a major but controversial topic in evolutionary biology. Theoretical models predict that the level of FA should increase as a result of inbreeding, but empirical results are ambiguous. Moreover, the relationship between fitness and FA is still debated. In the current study, plants from a population of Scabiosa canescens, a locally rare species in southern Sweden, were raised under uniform growth conditions to examine the effects of one-generation of selfing and outcrossing on FA in flower morphology. The level of flower FA was significantly higher (p = 0.038) for inbred progeny than... (More)
Developmental instability and fluctuating asymmetry (FA) describe the inability of organisms to correct for random accidents under development and has become a major but controversial topic in evolutionary biology. Theoretical models predict that the level of FA should increase as a result of inbreeding, but empirical results are ambiguous. Moreover, the relationship between fitness and FA is still debated. In the current study, plants from a population of Scabiosa canescens, a locally rare species in southern Sweden, were raised under uniform growth conditions to examine the effects of one-generation of selfing and outcrossing on FA in flower morphology. The level of flower FA was significantly higher (p = 0.038) for inbred progeny than for offspring derived from outcross pollinations. Given that earlier studies of this species have found no negative relation between heterozygosity and FA, the results support the conclusion that expression of deleterious recessive alleles are responsible for the increase of FA. There was no correlation between FA and estimates of five fitness-related traits when estimated at the individual level. However, a companion study found significant inbreeding depression for all fitness traits, and a negative association between FA and fitness could therefore be asserted at the treatment level (inbred/outbred progeny). Hence, FA seems to be useful to predict inbreeding depression in S. canescens, but specific individuals with high fitness cannot be identified based on their FA levels. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Evolutionary Ecology
volume
15
issue
2
pages
117 - 127
publisher
Springer
external identifiers
  • scopus:0035709380
ISSN
1573-8477
DOI
10.1023/A:1013866608313
language
English
LU publication?
no
id
6069cd84-5705-43be-bf6e-73331d7c69c8 (old id 152982)
date added to LUP
2007-07-03 09:52:49
date last changed
2018-02-18 03:39:47
@article{6069cd84-5705-43be-bf6e-73331d7c69c8,
  abstract     = {Developmental instability and fluctuating asymmetry (FA) describe the inability of organisms to correct for random accidents under development and has become a major but controversial topic in evolutionary biology. Theoretical models predict that the level of FA should increase as a result of inbreeding, but empirical results are ambiguous. Moreover, the relationship between fitness and FA is still debated. In the current study, plants from a population of Scabiosa canescens, a locally rare species in southern Sweden, were raised under uniform growth conditions to examine the effects of one-generation of selfing and outcrossing on FA in flower morphology. The level of flower FA was significantly higher (p = 0.038) for inbred progeny than for offspring derived from outcross pollinations. Given that earlier studies of this species have found no negative relation between heterozygosity and FA, the results support the conclusion that expression of deleterious recessive alleles are responsible for the increase of FA. There was no correlation between FA and estimates of five fitness-related traits when estimated at the individual level. However, a companion study found significant inbreeding depression for all fitness traits, and a negative association between FA and fitness could therefore be asserted at the treatment level (inbred/outbred progeny). Hence, FA seems to be useful to predict inbreeding depression in S. canescens, but specific individuals with high fitness cannot be identified based on their FA levels.},
  author       = {Waldmann, P},
  issn         = {1573-8477},
  language     = {eng},
  number       = {2},
  pages        = {117--127},
  publisher    = {Springer},
  series       = {Evolutionary Ecology},
  title        = {The effect of inbreeding on fluctuating asymmetry in Scabiosa canescens (Dipsacaceae)},
  url          = {http://dx.doi.org/10.1023/A:1013866608313},
  volume       = {15},
  year         = {2001},
}