We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Shifting habitats, morphology, and selective pressures: Developmental polyphenism in an adaptive radiation of Hawaiian spiders.
- Authors
Brewer, Michael S.; Carter, Rebecca A.; Croucher, Peter J. P.; Gillespie, Rosemary G.
- Abstract
Particularly intriguing examples of adaptive radiation are those in which lineages show parallel or convergent evolution, suggesting utilization of similar genetic or developmental pathways. The current study focuses on an adaptive radiation of Hawaiian 'spiny-leg' spiders in which diversification is associated with repeated convergent evolution leading to similar sets of ecomorphs on each island. However, two species on the oldest islands in the archipelago exhibit variability, occurring as two different ecomorphs. More derived species on the younger islands show much less variability, any one species displaying a single ecomorph. We measured ecomorphological features within individuals over time to determine the nature of the variability. Then, using transcriptomes, we conducted lineage-based tests for selection under varying models and analyses of gene tree versus species tree incongruencies. Our results provide strong evidence that variability in color in Tetragnatha kauaiensis and T. polychromata is associated with development within individuals (polyphenism). Moreover, a total of 28 loci showed a signature of selection associated with loss of the color-changing phenotype, and 37 loci showed a signature of selection associated with the colonization of a new environment. The results illustrate how developmental polyphenism might provide an avenue for the repeated evolution of ecomorphs during adaptive radiation.
- Subjects
SPIDER ecology; HABITATS; DEVELOPMENTAL biology; ANIMAL morphology; ADAPTIVE radiation
- Publication
Evolution, 2015, Vol 69, Issue 1, p162
- ISSN
0014-3820
- Publication type
Article
- DOI
10.1111/evo.12563