5. Conclusions
Our study recorded significant pollen limitation for approximately a third of species occurring in a wet meadow community. It was much lower than what has been reported in the previous reviews of single species studies, but higher when compared with all other community level studies. The discrepancy in the results of these studies can be attributed to several issues, such as sampling and publication biases. Except for the number of pollinator functional groups, we could not attribute pollen limitation to the other measured floral and life history traits. Therefore, some additional traits may also be contributing to patterns of pollen limitation. Such additional traits could be extrinsic traits (e.g. regional plant diversity) because interactions between extrinsic and floral or life history traits may be the major driver of pollen limitation in communities (Vamosi et al. 2013). Finally, other overlooked and possibly important factors can be spatial and temporal variations in pollen limitation within and among communities.