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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Floral trait variation and integration as a function of sexual deception in Gorteria diffusa
Philosophical Transactions of the Royal Society B: Biological Sciences, Volume 369, No. 1649, Year 2014
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Description
Phenotypic integration, the coordinated covariance of suites of morphological traits, is critical for proper functioning of organisms. Angiosperm flowers are complex structures comprising suites of traits that function together to achieve effective pollen transfer. Floral integration could reflect shared genetic and developmental control of these traits, or could arise through pollinator-imposed stabilizing correlational selection on traits. We sought to expose mechanisms underlying floral trait integration in the sexually deceptive daisy, Gorteria diffusa, by testing the hypothesis that stabilizing selection imposed by male pollinators on floral traits involved in mimicry has resulted in tighter integration. To do this, we quantified patterns of floral trait variance and covariance in morphologically divergent G. diffusa floral forms representing a continuum in the levels of sexual deception. We show that integration of traits functioning in visual attraction of male pollinators increases with pollinator deception, and is stronger than integration of non-mimicry trait modules. Consistent patterns of within-population trait variance and covariance across floral forms suggest that integration has not been built by stabilizing correlational selection on genetically independent traits. Instead pollinator specialization has selected for tightened integration within modules of linked traits. Despite potentially strong constraint on morphological evolution imposed by developmental genetic linkages between traits, we demonstrate substantial divergence in traits across G. diffusa floral forms and show that divergence has often occurred without altering within-population patterns of trait correlations. © 2014 The Author(s) Published by the Royal Society. All rights reserved.
Authors & Co-Authors
Ellis, Allan G.
South Africa, Stellenbosch
Stellenbosch University
Brockington, Samuel F.
United Kingdom, Cambridge
University of Cambridge
De Jager, Marinus L.
South Africa, Stellenbosch
Stellenbosch University
Mellers, Gregory
United Kingdom, Cambridge
University of Cambridge
Walker, Rachel H.
United Kingdom, Cambridge
University of Cambridge
Glover, Beverley J.
United Kingdom, Cambridge
University of Cambridge
Statistics
Citations: 24
Authors: 6
Affiliations: 2
Identifiers
Doi:
10.1098/rstb.2013.0563
ISSN:
09628436
Research Areas
Genetics And Genomics
Sexual And Reproductive Health
Study Design
Cross Sectional Study
Participants Gender
Male