Limited latitudinal mantle plume motion for the Louisville hotspot

Koppers, Anthony A. P., Yamazaki, Toshitsugu, Geldmacher, Joerg, Gee, Jeffrey S., Pressling, Nicola, Hoshi, Hiroyuki, Anderson, L., Beier, C., Buchs, D. M., Chen, L-H., Cohen, B. E., Deschamps, F., Dorais, M. J., Ebuna, D., Ehmann, S., Fitton, J. G., Fulton, P. M., Ganbat, E., Hamelin, C., Hanyu, T., Kalnins, L., Kell, J., Machida, S., Mahoney, J. J., Moriya, K., Nichols, A. R. L., Rausch, S., Sano, S-I, Sylvan, J. B. and Williams, R. (2012) Limited latitudinal mantle plume motion for the Louisville hotspot. Nature Geoscience, 5 12: 911-917. doi:10.1038/NGEO1638


Author Koppers, Anthony A. P.
Yamazaki, Toshitsugu
Geldmacher, Joerg
Gee, Jeffrey S.
Pressling, Nicola
Hoshi, Hiroyuki
Anderson, L.
Beier, C.
Buchs, D. M.
Chen, L-H.
Cohen, B. E.
Deschamps, F.
Dorais, M. J.
Ebuna, D.
Ehmann, S.
Fitton, J. G.
Fulton, P. M.
Ganbat, E.
Hamelin, C.
Hanyu, T.
Kalnins, L.
Kell, J.
Machida, S.
Mahoney, J. J.
Moriya, K.
Nichols, A. R. L.
Rausch, S.
Sano, S-I
Sylvan, J. B.
Williams, R.
Title Limited latitudinal mantle plume motion for the Louisville hotspot
Journal name Nature Geoscience   Check publisher's open access policy
ISSN 1752-0894
1752-0908
Publication date 2012-12-01
Sub-type Article (original research)
DOI 10.1038/NGEO1638
Open Access Status DOI
Volume 5
Issue 12
Start page 911
End page 917
Total pages 7
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Abstract Sex-limited polymorphisms are an intriguing form of sexual dimorphism that offer unique opportunities to reconstruct the evolutionary changes that decouple male and female traits encoded by a shared genome. We investigated the genetic basis of a Mendelian female-limited color dimorphism (FLCD) that segregates in natural populations of more than 20 species of the Drosophila montium subgroup. In these species, females have alternative abdominal color morphs, light and dark, whereas males have only one color morph in each species. A comprehensive molecular phylogeny of the montium subgroup supports multiple origins of FLCD. Despite this, we mapped FLCD to the same locus in four distantly related species-the transcription factor POU domain motif 3 (pdm3), which acts as a repressor of abdominal pigmentation in D. melanogaster. In D. serrata, FLCD maps to a structural variant in the first intron of pdm3; however, this variant is not found in the three other species-D. kikkawai, D. leontia, and D. burlai-and sequence analysis strongly suggests the pdm3 alleles responsible for FLCD originated independently at least three times. We propose that cis-regulatory changes in pdm3 form sexually dimorphic and monomorphic alleles that segregate within species and are preserved, at least in one species, by structural variation. Surprisingly, pdm3 has not been implicated in the evolution of sex-specific pigmentation outside the montium subgroup, suggesting that the genetic paths to sexual dimorphism may be constrained within a clade but variable across clades.
Formatted abstract
Hotspots that form above upwelling plumes of hot material from the deep mantle  typically leave narrow trails of volcanic seamounts as a tectonic plate moves over their location. These seamount trails are excellent recorders of Earth’s deep processes and allow us to untangle ancient mantle plume motions. During ascent it is likely that  mantle plumes are pushed away from their vertical upwelling trajectories by mantle convection forces. It has been proposed that a large-scale lateral displacement,  termed the mantle wind, existed in the Pacific between about 80 and 50 million years ago, and shifted the Hawaiian mantle plume southwards by about 15° of latitude. Here we use 40Ar/39Ar age dating and palaeomagnetic inclination data from four  seamounts associated with the Louisville hotspot in the South Pacific Ocean to show  that this hotspot has been relatively stable in terms of its location. Specifically, the Louisville hotspot—the southern hemisphere counterpart of Hawai’i—has remained  within 3–5° of its present-day latitude of about 51° S between 70 and 50 million years  ago. Although we cannot exclude a more significant southward motion before that  time, we suggest that the Louisville and Hawaiian hotspots are moving independently, and not as part of a large-scale mantle wind in the Pacific.
Keyword Emperor Seamounts
Geomagnetic-Field
Hawaiian Hotspot
Magnetic-Field
Earths Mantle
Origin
Model
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID R01 GM084947
R01 GM111797
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2013 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 28 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 29 times in Scopus Article | Citations
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