But what about other recent arrivals? What about Ivy bees and Tree bumblebees? Unlike the Asian hornet these species are not 'predators' nor have they arrived via human agency. But could they be competing with our existing population of bees (and other insects) for foraging and habitat? Do we know yet if this is the case? Does it matter? If not, why not? Maybe these and other new species arriving from Northern Europe will prove better equipped to deal with an ever changing landscape and climate that our existing bee species might struggle with in the future.
Food for thought.... and as an aside, I think we would do well to remember that we, the human race, cause more damage to biodiversity than all the invasive plants put together. When human beings talk about 'invasive species', the expression 'pots and kettles' springs to mind.
I ask these last questions (about bees) because where I live in Shaftesbury, North Dorset, I have seen a huge increase in the number of honeybee hive being kept by local beekeepers over the last couple of years. Where these colonies are at their most dense I am now noticing that bumblebees are conspicuous by their absence on sedum and other plants popular with the honeybees, whereas further out of Shaftesbury, in surrounding villages where there are not so many beehives, the sedum, at least, is covered in bumblebees and butterflies in the autumn.
If you are interested in exploring these questions further, you might like to read The New Wild by Fred Pearce. A very thought provoking book!
Also, check out this post on Biff Vernon's Blogspot.
With many thanks to twitter friend @dolly_and_dj for allowing me to use her beautiful photograph x