Your questions don't really apply to the lilac bushy. It is usually grown as an ornamental plant.
http://en.wikipedia.org/wiki/Syringa_vulgaris
What role does the lilac flower play in its natural ecosystem? What is its niche in the food web
Are there any ecological issues surrounding the lilac flower(e.g. are its populations decreasing, is it spreading uncontrollably..)
4 answers
i know.. but i cant find anywhere online about its role and ecological issues
I believe you can't find anything because the lilac is not a wild plant. It's grown only in parks and people's yards. It is controlled by humans and place little if any part in the natural world.
Here's a little about the wild lilac.
http://www.goldenwestcollege.edu/garden/plantofmonth/0310.html
Here's a little about the wild lilac.
http://www.goldenwestcollege.edu/garden/plantofmonth/0310.html
If you can't find these types of information about it, then that most likely means it has no ecological issues and maybe its role is not critical.