Could mass bird die offs affect plant evolution badly?

Migrating mass of birds are also responsible for pollinating plants/trees.

They may not be wholly responsible for that job but since they travel much farther than say, insects, they probably do a better job at enhancing genetic diversity of plants/trees. Better genetic diversity means a stronger, more resilient plant or tree, more 'weather proof', more adaptable to changing environment conditions, and generally with better immunity from diseases.

With reduced genetic diversity if bird's populations or migration patterns are badly disrupted, plants and trees will be more vulnerable to changes in the environment. And so, species that also depend on plants and trees to survive will also be badly affected.

To make things worse, our climate is gradually departing from its norms. All this could also result to mass plant/tree die offs, more forest fires and eventually killing species that depends on plants/trees to survive.

of course its going to affect things, at least a little bit. overabundance of bugs. no lil birds to scoop em up. just think, with all of the misquitos, places that had those birds to cull the bloodsuckers are going to get hit pretty bad. dont be surprised when they start pushing west nile fears again