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Title: Natural Interspecific Hybridization in Gunnera (Gunneraceae) of the Juan Fernandez Islands, Chile 
Author: Pacheco, Patricia; Stuessy, Tod F.; Crawford, Daniel J.
Date: 1991-10
Publisher: University of Hawai'i Press
Citation: Pacheco P, Stuessy TF, Crawford DJ. 1991. Natural interspecific hybridization in Gunnera (Gunneraceae) of the Juan Fernandez Islands, Chile. Pac Sci 45(4): 389-399.
Abstract: Natural interspecific hybridization between Gunnera bracteata
and G. peltata (Gunneraceae) in the Juan Fernandez Islands, Chile, is analyzed
morphologically and chemically. Parental types from isolated populations were
compared with parents and intermediates occurring together in Quebrada
Villagra on Masatierra. Two transects were made in that area, one in a relatively
undisturbed site, and another along a disturbed path. Hybrid indexes and
distance diagrams were used to analyze morphological relationships, and
leafflavonoids revealed chemical affinities. Minor flavonoid divergence between
parental species precluded detailed analysis of dynamics of hybridization.
Morphological analysis revealed intermediacy in both transects,with intergradation
back toward both parents. It is suggested that introgressive hybridization
is occurring in Quebrada Villagra between these two wind-pollinated species,
with more hybridization taking place in disturbed regions. Reduction in surface
area and changes in the ecology of Masatierra during the past four million years
may have brought the two species into closer contact and aided hybridization.
ISSN: 0030-8870

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