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Metrics matter: the effect of parasite richness, intensity and prevalence on the evolution of host migration.


ABSTRACT: Parasites have long been thought to influence the evolution of migration, but precisely determining the conditions under which this occurs by quantifying costs of infection remains a challenge. Here we developed a model that demonstrates how the metric used to describe infection (richness/diversity, prevalence or intensity) shapes the prediction of whether migration will evolve. The model shows that predictions based on minimizing richness yield opposite results compared to those based on minimizing prevalence, with migration only selected for when minimizing prevalence. Consistent with these findings, empirical studies that measure parasite diversity typically find that migrants are worse off than residents, while those measuring prevalence or intensity find the opposite. Our own empirical analysis of fish parasite data finds that migrants (of all types) have higher parasite richness than residents, but with no significant difference in either prevalence or intensity.

SUBMITTER: Shaw AK 

PROVIDER: S-EPMC6253363 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature

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Metrics matter: the effect of parasite richness, intensity and prevalence on the evolution of host migration.

Shaw Allison K AK   Sherman Julie J   Barker F Keith FK   Zuk Marlene M  

Proceedings. Biological sciences 20181114 1891


Parasites have long been thought to influence the evolution of migration, but precisely determining the conditions under which this occurs by quantifying costs of infection remains a challenge. Here we developed a model that demonstrates how the metric used to describe infection (richness/diversity, prevalence or intensity) shapes the prediction of whether migration will evolve. The model shows that predictions based on minimizing richness yield opposite results compared to those based on minimi  ...[more]

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