Hybridization and adaptation to introduced balloon vines in an Australian soapberry bug

Andres, J. A., Thampy, P. R., Mathieson, M. T., Loye, J., Zalucki, M. P., Dingle, H. and Carroll, S. P. (2013) Hybridization and adaptation to introduced balloon vines in an Australian soapberry bug. Molecular Ecology, 22 24: 6116-6130. doi:10.1111/mec.12553


Author Andres, J. A.
Thampy, P. R.
Mathieson, M. T.
Loye, J.
Zalucki, M. P.
Dingle, H.
Carroll, S. P.
Title Hybridization and adaptation to introduced balloon vines in an Australian soapberry bug
Journal name Molecular Ecology   Check publisher's open access policy
ISSN 0962-1083
1365-294X
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1111/mec.12553
Open Access Status Not yet assessed
Volume 22
Issue 24
Start page 6116
End page 6130
Total pages 15
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell
Language eng
Abstract Contemporary adaptation of plant feeding insects to introduced hosts provides clear cases of ecologically based population divergence. In most cases the mechanisms permitting rapid differentiation are not well known. Here we study morphological and genetic variation associated with recent shifts by the Australian soapberry bug Leptocoris tagalicus onto two naturalized Neotropical balloon vines, Cardiospermum halicacabum and C.grandiflorum that differ in time since introduction. Our results show that these vines have much larger fruits than the native hosts (Whitewood tree -Atalaya hemiglauca- and Woolly Rambutan -Alectryon tomentosus-) and that bugs living on them have evolved significantly longer beaks and new allometries. Genetic analyses of mitochondrial haplotypes and amplified fragment length polymorphic (AFLP) markers indicate that the lineage of bugs on the annual vine C.halicacabum, the older introduction, is intermediate between the two subspecies of L.tagalicus found on native hosts. Moreover, where the annual vine and Whitewood tree co-occur, the morphology and genomic composition of the bugs are similar to those occurring in allopatry. These results show that hybridization provided the genetic elements underlying the strongly differentiated Halicacabum bugs'. In contrast, the bugs feeding on the recently introduced perennial balloon vine (C.grandiflorum) showed no evidence of admixture, and are genetically indistinguishable from the nearby populations on a native host.
Formatted abstract
Contemporary adaptation of plant feeding insects to introduced hosts provides clear cases of ecologically based population divergence. In most cases the mechanisms permitting rapid differentiation are not well known. Here we study morphological and genetic variation associated with recent shifts by the Australian soapberry bug Leptocoris tagalicus onto two naturalized Neotropical balloon vines, Cardiospermum halicacabum and C. grandiflorum that differ in time since introduction. Our results show that these vines have much larger fruits than the native hosts (Whitewood tree -Atalaya hemiglauca- and Woolly Rambutan -Alectryon tomentosus-) and that bugs living on them have evolved significantly longer beaks and new allometries. Genetic analyses of mitochondrial haplotypes and amplified fragment length polymorphic (AFLP) markers indicate that the lineage of bugs on the annual vine C. halicacabum, the older introduction, is intermediate between the two subspecies of L. tagalicus found on native hosts. Moreover, where the annual vine and Whitewood tree co-occur, the morphology and genomic composition of the bugs are similar to those occurring in allopatry. These results show that hybridization provided the genetic elements underlying the strongly differentiated 'Halicacabum bugs'. In contrast, the bugs feeding on the recently introduced perennial balloon vine (C. grandiflorum) showed no evidence of admixture, and are genetically indistinguishable from the nearby populations on a native host.
Keyword Diversification
Hemiptera
Host shift
Hybridization
Invasive species
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
 
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