2022 article

Effects of an alternative host on the prevalence and intensity of infection of a bumble bee parasite

Pinilla-Gallego, M. S., & Irwin, R. E. (2022, January 24). PARASITOLOGY.

co-author countries: United States of America πŸ‡ΊπŸ‡Έ
author keywords: Bombus impatiens; Crithidia bombi; serial passage
MeSH headings : Animals; Bees; Crithidia; Host Specificity; Host-Parasite Interactions; Parasites; Prevalence
Source: Web Of Science
Added: March 21, 2022

Several bee parasites are transmitted through flowers, and some of them can infect multiple host species. Given the shared use of flowers by bee species, parasites can potentially encounter multiple host species, which could affect the evolution of parasite virulence. We used the trypanosomatid parasite Crithidia bombi and its host, the common eastern bumble bee (Bombus impatiens), to explore the effect of infecting an alternative host, the alfalfa leaf-cutter bee (Megachile rotundata), on parasite infectivity and ability to replicate. We conducted a serial passage experiment on primary and alternative hosts, assessing infectivity and intensity of infection during five passes. Parasite cells from each pass through the alternative host were also used to infect a group of primary hosts. We found that serial passes through the alternative host increased infectivity, but there was no effect on intensity of infection. Interestingly, both the probability and intensity of infection on the primary host increased after serial passage through the alternative host. This increase in intensity of infection could be due to maladaptation after selection of new C. bombi strains has occurred in the alternative host. This study suggests that host switching has the potential to affect the adaptation of bee parasites to their hosts.