Evolutionary dynamics of a cycad obligate pollination mutualism - Pattern and process in extant Macrozamia cycads and their specialist thrips pollinators

Brookes, D. R., Hereward, J. P., Terry, L. I. and Walter, G. H. (2015) Evolutionary dynamics of a cycad obligate pollination mutualism - Pattern and process in extant Macrozamia cycads and their specialist thrips pollinators. Molecular Phylogenetics and Evolution, 93 83-93. doi:10.1016/j.ympev.2015.07.003


Author Brookes, D. R.
Hereward, J. P.
Terry, L. I.
Walter, G. H.
Title Evolutionary dynamics of a cycad obligate pollination mutualism - Pattern and process in extant Macrozamia cycads and their specialist thrips pollinators
Formatted title
Evolutionary dynamics of a cycad obligate pollination mutualism - Pattern and process in extant Macrozamia cycads and their specialist thrips pollinators
Journal name Molecular Phylogenetics and Evolution   Check publisher's open access policy
ISSN 1095-9513
1055-7903
Publication date 2015-12-01
Sub-type Article (original research)
DOI 10.1016/j.ympev.2015.07.003
Volume 93
Start page 83
End page 93
Total pages 11
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Language eng
Formatted abstract
Obligate pollination mutualisms are rare and few have been investigated deeply. This paper focuses on one such mutualism involving thrips in the genus Cycadothrips that pollinate cycads in the genus Macrozamia. Both represent old lineages relative to insects and plants generally, are endemic to Australia, and are mutually co-dependent. The phylogenetic analyses presented here demonstrate that the pollinator is much more diverse than previously considered, with each pollinator lineage being extremely specific to between one and three host species where these latter share part of their distribution. The new species diversity we demonstrate in Cycadothrips all presently falls under the species name C. chadwicki, and these different lineages diversified during two periods. An older divergence, beginning 7.3 Mya (4.4–11.1, 95% HPD), resulted in three major lineages, and then further diversification within each of these three lineages took place at most 1.1 Mya (0.6–1.8, 95% HPD). These divergence estimates correspond to times when aridification was increasing in Australia, suggesting that population fragmentation following climatic change has played a significant role in the evolutionary history of Cycadothrips and Macrozamia. This means that co-diversification of the host and pollinator in allopatry appears to be the dominant process affecting species diversity. Host switching is also clearly evident in the discrepancy between the divergence times of the C. chadwicki lineage and C. albrechti, about 10.8 Mya (6.0–17.1, 95% HPD), and their hosts, at about 1.1 Mya (0.2–3.4 Mya, 95% HPD), in that the pollinator split pre-dates the origin of the associated host species of each. These results add to the body of evidence that the evolutionary processes important in obligate pollinator mutualisms are more varied than previously assumed.
Keyword Biogeography
Coevolution
Cycadothrips
Host specificity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Biological Sciences Publications
 
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