Publication details.


Author(s):R. Lundgren, A. Lázaro, O. Totland
Title:Experimental pollinator decline affects plant reproduction and is mediated by plant mating system
Journal:Journal of Pollination Ecology
There is growing concern that current pollinator decline will affect the reproduction of plant species, 
potentially driving a decline in plant population densities. We experimentally tested whether a reduction in flower 
visitation caused a reduction in fertilization rate in several species, and whether any reduction in fecundity of species 
depends on their degree of reproductive dependence on pollinators and their attractiveness for pollinators. We 
recorded visitation rate, fertilization rate, seed weight, flower size and density of nineteen insect-pollinated perennial 
herbs inside thirty 2 x 2 m dome-shaped cages covered with fishnet (experimental plots) and in thirty control plots 
in a Norwegian hay meadow. We used a bagging experiment to estimate the ability of the study species to produce 
seeds in the absence of pollinators. The visitation rate for fifteen of nineteen study species was lower inside cages 
than outside and only three of the fifteen species showed significantly reduced fertilization rates in the experimental 
plots. The magnitude of reduction in fertilization rate was positively related to the degree of pollinator dependence, 
but not to their attractiveness for pollinators or to the reduction in visitation rate. Seed weight was not affected by 
the experiment. The lack of an overall effect of reduced pollinator visitation on fertilization rate suggests that some 
species may be robust to a pollinator decline that could increase pollen limitation on plant reproduction. Our results 
suggest that species with greater pollinator dependence are more vulnerable to pollinator loss. 

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