Quinn (1987) examined the possibility that postdispersal sibling competition played a role in the evolution of differential seed germinability in Buchloe dactyloides, which produces burs containing one to five seeds with often staggered germination.
Relationship between synaptospermy and dioecy in the life-history strategies of Buchloe dactyloides (Graminae).
The mosaic system is a mixture of short-grass prairie on the more xeric, upland or south facing slopes and can be dominated by Bouteloua gracilis, Bouteloua hirsuta, Andropogon scoparius, Carex filifolia, and Buchloe dactyloides (Kaul and Rolfsmeier 1993).
Bouteloua gracilis (19% cover), Carex filifolia (15% cover), Buchloe dactyloides (5% cover), Sporobolus cryptandrus (5% cover), and Stipa comata (5% cover) were the dominant graminoids across the site, while Yucca glauca (1% cover) and Artemisia frigida (1% cover) dominated the forbs.
With few exceptions (17 of 71 species), quadrat size did not affect frequency estimates for species that occurred in fewer than 10% of quadrats, whereas (except for Buchloe dactyloides and Aristida oligantha) quadrat size did affect frequency estimates for all species that occurred in greater than 10% of quadrats (n =17) (Figure 2).