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COMPETITIVE RELATIONSHIPS OF OENOTHERA SPECIES WITH DIFFERENT RECOMBINATION SYSTEMS
Author(s) -
Russell Joanna,
Levin Donald A.
Publication year - 1988
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1988.tb08830.x
Subject(s) - biology , obligate , oenothera , facultative , onagraceae , interspecific competition , competition (biology) , botany , ecology , evolutionary biology
The hypothesis that outcrossers are competitively superior to close relatives with specialized genetic systems was tested. Interspecific competition between three closely related Oenothera species was examined in common garden environments. Oenothera grandis , an obligate outcrosser, is competitively superior to its derivative, O. laciniata , an obligate chromosomal heterozygote. Both of these species are superior to O. mexicana , a closely related facultative selfer. These relationships were consistent over two levels of density stress. Therefore, in this species triad, the outcrosser has a competitive advantage over its close relatives with derived breeding systems.