Weak evidence of trade-offs modulated by seed mass among a guild of closely related winter annuals.

In the relative log(biomass) model (also R 2 = 0.10), the interaction between seed mass and the squared term for heterospecific density was marginally significant ( P = 0.041, Table 4 ) and indicated that light-seeded species exhibited a shallow hump-shaped relationship with heterospecific density whereas heavy-seeded species exhibited a shallow U-shaped relationship (Fig.

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