Seed removal was not affected by seed weight ( P
> 0.2 for all four times), but differed significantly
among the three treatments at all four times ( n
= 623 seeds remained at one week, χ2 = 142, df = 2,
P < 0.001, Fig. 1 a; n
= 461 seeds remained at one month, χ2 = 117, df = 2,
P < 0.001, Fig. 1 b; n
= 326 seeds remained at three months, χ2 = 117, df = 2,
P < 0.001, not shown; n
= 201 seeds alive at χ2
= 91, df = 2, P
< 0.001, Fig. 1 c).