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Phylogeny and Biogeography of Pacific Rubus Subgenus ldaeobatus (Rosaceae) Species: Investigating the Origin of the Endemic Hawaiian Raspberry R. macraei

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Title: Phylogeny and Biogeography of Pacific Rubus Subgenus ldaeobatus (Rosaceae) Species: Investigating the Origin of the Endemic Hawaiian Raspberry R. macraei
Authors: Morden, Clifford W.
Gardner, Donald E.
Weniger, Dana A.
Issue Date: Apr 2003
Publisher: University of Hawai'i Press
Citation: Morden CW, Gardner DE, Weniger DA. 2003. Phylogeny and biogeography of Pacific Rubus subgenus ldaeobatus (Rosaceae) species: investigating the origin of the endemic Hawaiian raspberry R. macraei. Pac Sci 57(2): 181-197.
Abstract: The endemic Hawaiian raspberries Rubus hawaiensis and R. macraei
(both subgenus Idaeobatus) had been thought to be closely related species until
recent molecular studies demonstrated otherwise. These studies suggest that
they are the products of separate colonizations to the Hawaiian Islands. Affinities
of R. hawaiensis to R. spectabilis of western North America were clearly
confirmed. However, no clear relation to R. macraei has been published. This
study was initiated to examine species of subg. Idaeobatus from the surrounding
Pacific region as well as species from other subgenera to better evaluate biogeographic
and phylogenetic affinities of R. macraei by means of chromosome
analysis and molecular data using the chloroplast gene ndhF. Results show that
R. macraei clusters in a clade with species of blackberries, subg. Rubus, and of
these it is most closely linked to R. ursinus. Chromosomally, R. macraei is
2n = 6x = 42, a number that would be a new report for subg. Idaeobatus. However,
polyploidy is common in subg. Rubus. Analyses indicate that R. macraei and
R. hawaiensis are derived from separate colonizations from North America and
that similarities between them are due to convergent evolution in the Hawaiian
environment.
URI/DOI: http://hdl.handle.net/10125/2671
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 57, Number 2, 2003



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