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Sex Allocation and Reproductive Success in the Andromonoecious Perennial Solanum carolinense (Solanaceae). II. Paternity and Functional Gender
Ist Teil von
The American naturalist, 2000-12, Vol.156 (6), p.622-636
Ort / Verlag
United States: The University of Chicago Press
Erscheinungsjahr
2000
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
According to Bateman's principle, male fitness in entomophilous plant
species should be limited by mating opportunity, which is influenced by the
size or number of flowers. We determined male-specific fitness
consequences of floral phenotype in andromonoecious Solanum
carolinense, examined the relationship between male and female
reproductive success within plants, and evaluated the distribution of
functional gender among plants. A maximum likelihood-based paternity
analysis, based on multilocus allozyme phenotypes of parents and offspring
from four experimental plots, was used to determine male reproductive
success and its relationship to floral phenotype. Male success was enhanced
by an increase in the proportion of male flowers produced but not by an
increase in total flower number, even though all flowers contain male
parts. Larger flower size increased male success in only one plot. Male and
female reproductive success were negatively correlated, and plants
varied in functional gender from completely female to completely male. This
gender specialization may occur because hermaphroditic and male flowers
differ in their ability to contribute to male and female success. Although
sex allocation theory predicts a positive relationship between the size or
number of plant parts and reproductive success, this study indicates that
aspects of floral morphology that affect gender specialization should also
be considered.