Abstract:
:We examined the relationship between size variability and the distribution of functional gender in stands of the monoecious, wind-pollinated annual Ambrosia artemisiifolia. Populations of 60 individuals were grown in the greenhouse at a density of 372 m-2 and at two nutrient levels. Among the surviving plants, after self-thinning, variability in above-ground biomass and gender was higher in the high nutrient treatment. Among individuals there was a significant positive correlation between maleness and both height and biomass. Fecundity was also positively correlated with both measures of size. Based on the pattern of distribution of male and female flowers within the plant, it appears that the increase in maleness in larger plants is due to increased branching and axis elongation. These results demonstrate that competitive interactions, which lead to increased variability in biomass and fecundity, can also generate variability in gender within populations.
journal_name
Oecologiajournal_title
Oecologiaauthors
Ackerly DD,Jasieński Mdoi
10.1007/BF00319788subject
Has Abstractpub_date
1990-04-01 00:00:00pages
474-477issue
4eissn
0029-8549issn
1432-1939pii
10.1007/BF00319788journal_volume
82pub_type
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