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.