Parasitic and Allied Interactions

Abstract

No more intimate relationship exists between one species and another than the bond linking parasites with their hosts. Parasites have traditionally been regarded as having an impact on the populations of their hosts rather similar to those of predators on prey populations. Recent studies, however, indicate that the influence of parasites is more subtle than that of predators. They may kill their hosts or have only slight, almost undetectable effects on their viability. They can alter the fecundity of the host, its competitive ability, physiology, social dominance or its ability to attract mates. They may even be beneficial by making intermediate hosts more available as prey, or by reducing the fitness of co-infested competing species (Bull and Burzacott 1993).