Populations of the damselflyCoenagrion hastulatumat the edge of the species range have fewer gregarine and water mite parasites

Summary The metapopulation theory predicts that the more distant a host population is from other populations, the more challenged will be a parasite to colonise it. We studied parasite prevalence of two parasite taxa across the geographical range of their host in Finland, from more dense host population structure in the south of Finland, towards the northern edge of the host distribution characterised by more isolated populations. We found that...