Abstract
Abstract The importance of the first mechanism and the modification of seed coat traits (e.g., permeability of the coat to water and gases) after gut treatment, which changes the capacity of germination and/or the speed at which seeds germinate, were studied. The overall effect of gut treatment on seed germination percentage was significantly positive (mean effect size lnOR=0.29; 95% CI: (0.27-0.31)). A similar value was found when meta-analysis was carried out at the study level (lnOR=0.25; (0.23-0.72)), which avoids pseudo-replication effects. The heterogeneity test of Qt was highly significant (P<0.00001), implying that other variables (predictors) account for some of the variation among studies. It is suggested that seed passage through the gut of a vertebrate can probably break only seed coat dormancy (functional dormancy) and not physiological (internal or embryological) dormancy, as difference in germination rate between ingested and uningested seeds are usually only a few days and more rarely a few weeks.
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