Search results for "multi-parasitized hosts"
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Parasite and host assemblages: embracing the reality will improve our knowledge of parasite transmission and virulence.
2010
10 pages; International audience; Interactions involving several parasite species (multi-parasitized hosts) or several host species (multi-host parasites) are the rule in nature. Only a few studies have investigated these realistic, but complex, situations from an evolutionary perspective. Consequently, their impact on the evolution of parasite virulence and transmission remains poorly understood. The mechanisms by which multiple infections may influence virulence and transmission include the dynamics of intrahost competition, mediation by the host immune system and an increase in parasite genetic recombination. Theoretical investigations have yet to be conducted to determine which of these…
Gammarids and acanthocephalans, a multi-(cryptic) hosts and multi-parasites system?
2022
Multi-host parasites can exploit various host species that differ in abundance and susceptibility to infection, which will contribute unequally to their transmission and fitness. "Key hosts" are those contributing significantly more to the completion of the life cycle of such parasites. Three non-exclusive criteria may be used to identify a key host: its high abundance, its high exposure/susceptibility to infection, and the large number of infectious stages produced per infected individual. Many parasites with complex life cycles have evolved the ability to manipulate several traits of their intermediate hosts' phenotype, including behavior, thereby increasing the likelihood of transmission…