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POSTDISPERSAL SELECTION FOLLOWING MIXED MATING IN EUCALYPTUS REGNANS
Author(s) -
Hardner Craig M.,
Potts Bradley M.
Publication year - 1997
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1997.tb02392.x
Subject(s) - biology , inbreeding depression , outcrossing , inbreeding , eucalyptus , mating , open pollination , mating system , selection (genetic algorithm) , competition (biology) , botany , ecology , population , pollination , demography , pollen , artificial intelligence , sociology , computer science
Eucalyptus regnans is a mass flowering, tall forest tree of southeastern Australia with a mixed mating system. A field trial containing randomized single tree plots of self, outcross, and naturally open‐pollinated (OP) progenies of 13 parents from two natural populations was surveyed over 15 yr. Inbreeding depression in survival at 15 years was 67% for selfs, one of the highest levels reported for a tree species, and differed little between populations. OP progenies were intermediate and the difference in fitness among the three cross types indicated that at planting, 59% were derived from outcrossing. However, with selection against the inbred progenies, this increased to 83% by 15 yr of age. Most selection against selfs occurred after four years, coincident with canopy closure and the apparent onset of intense competition.
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