The genetic covariance between life cycle stages separated by metamorphosis

Aguirre, J. David, Blows, Mark W. and Marshall, Dustin J. (2014) The genetic covariance between life cycle stages separated by metamorphosis. Proceedings of the Royal Society B: Biological Sciences, 281 1788: 1-8. doi:10.1098/rspb.2014.1091

Author Aguirre, J. David
Blows, Mark W.
Marshall, Dustin J.
Title The genetic covariance between life cycle stages separated by metamorphosis
Journal name Proceedings of the Royal Society B: Biological Sciences   Check publisher's open access policy
ISSN 1471-2954
Publication date 2014-06-25
Year available 2014
Sub-type Article (original research)
DOI 10.1098/rspb.2014.1091
Open Access Status
Volume 281
Issue 1788
Start page 1
End page 8
Total pages 8
Place of publication London, United Kingdom
Publisher The Royal Society of London
Collection year 2015
Language eng
Formatted abstract
Metamorphosis is common in animals, yet the genetic associations between life cycle stages are poorly understood. Given the radical changes that occur at metamorphosis, selection may differ before and after metamorphosis, and the extent that genetic associations between pre- and post-metamorphic traits constrain evolutionary change is a subject of considerable interest. In some instances, metamorphosis may allow the genetic decoupling of life cycle stages, whereas in others, metamorphosis could allow complementary responses to selection across the life cycle. Using a diallel breeding design, we measured viability at four ontogenetic stages (embryo, larval, juvenile and adult viability), in the ascidian Ciona intestinalis and examined the orientation of additive genetic variation with respect to the metamorphic boundary. We found support for one eigenvector of G (gobsmax), which contrasted larval viability against embryo viability and juvenile viability. Target matrix rotation confirmed that while gobsmax shows genetic associations can extend beyond metamorphosis, there is still considerable scope for decoupled phenotypic evolution. Therefore, although genetic associations across metamorphosis could limit that range of phenotypes that are attainable, traits on either side of the metamorphic boundary are capable of some independent evolutionary change in response to the divergent conditions encountered during each life cycle stage.
Keyword Life-history evolution
Adaptive decoupling
Genetic variance-covariance matrix
Target matrix rotation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
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