Every time I extricate a tick from near my groin I recall with fondness a trip I took with a small group of youthful botanists to the west coast of Ireland in 1984. I tagged along with third year undergraduates on the annual University College Dublin Botany Department’s field trip to the Burren in Co Clare. The trip was designed to help these naturalists hone their plant identification skills, since the Burren – a grassland on karst topography — has a truly exceptional flora. One finds botanical treasures there not readily found elsewhere. I was a third-year zoology major and at that time my passion was for chrysomelid beetles with their shimmering metallic elytra and chironomid flies, the males of which family have those marvelous antennae that perch like out-sized Christmas trees upon their heads. I mention here, merely as a grateful aside, that my mentor for beetle work was Jimmy O’Connor for Dublin’s “Dead Zoo” (National Museum of Ireland, Natural History) and for flies it was Declan Murray from UCD. I am indebted greatly to both these excellent men.
We crossed through the Midlands early in the month of June stopping off at the Bog of Allen, a fine though now of course greatly diminished raised bog, which generation after generation of Irish folks have burned as peat to heat their damp and somewhat chilly homes. And as we approached our destination we stopped several times at sites of scientific interest. As groups of hushed botanists whisperingly conferred over the relative hairiness of sepals, the flexuousness of petals, the lanceoloation of leaves and so forth, I swept the margins of small steams with my net with giddy abandon. The art of sticking one’s head into a net of agitated insects to retrieve one’s prizes, and to transfer them to a small vial of ethanol, has not received its due attention, but we shall have to reserve that meditation for another time. Once back on the mini-bus I’d stow the net under the bus seat and we’d be off to the next venue.
As we approached Co Clare a mild clamor emerged from the botanists, upon whose finely pubescent legs — need I point to the genderlessness of this observation? — ticks were now promenading. By the time my net was recognized as the tick delivery mechanism, the little blighters has already made their greedy ascent to the humid and agreeable habitat of the nether-regions that seem to be their preference. The ticks were painstakingly removed that evening, a process, the self-administration of which I can admit to having a certain fondness. The trick here is patience, a steady hand, and the graduated amplification of pulling force. Ticks relent.
Now, a point I want to make here is metaphorically a rather small one. Ticks, not always noticed when in the field become a nuisance when they are in the wrong place at the wrong time. I had inadvertently transported these ticks from their point of immediate origin, and their impact was uncomfortably felt in a manner that demanded attention. These ticks that so afflicted my botanists were not, of course, themselves invasive species, nevertheless they can serve to illustrate the rudiments of invasive species biology. Invasive species are those spread by human agency outside their typical range and have an impact in the host location significant enough to warrant management action. Setting aside, for now, the terminological skirmishes over distinctions between non-natives, exotics, invasives and so on, I simply ask you to bear in mind as important the factors of transportation between locations and an impact in a new range that is assessed as consequential.
