Affiliation:
1. School of Biological Sciences, Monash University, Melbourne, VIC 3800, Australia
2. Centre for Geometric Biology, Monash University, Melbourne, VIC 3800, Australia
Abstract
Natural populations are experiencing an increase in the occurrence of both thermal stress and disease outbreaks. How these two common stressors interact to determine host phenotypic shifts will be important for population persistence, yet a myriad of different traits and pathways are a target of both stressors, making generalizable predictions difficult to obtain. Here, using the host
Daphnia magna
and its bacterial pathogen
Pasteuria ramosa
, we tested how temperature and pathogen exposure interact to drive shifts in multivariate host phenotypes. We found that these two stressors acted mostly independently to shape host phenotypic trajectories, with temperature driving a faster pace of life by favouring early development and increased intrinsic population growth rates, while pathogen exposure impacted reproductive potential through reductions in lifetime fecundity. Studies focussed on extreme thermal stress are increasingly showing how pathogen exposure can severely hamper the thermal tolerance of a host. However, our results suggest that under milder thermal stress, and in terms of life-history traits, increases in temperature might not exacerbate the impact of pathogen exposure on host performance, and vice versa.
Funder
Australian Research Council
Monash University
Subject
General Agricultural and Biological Sciences,Agricultural and Biological Sciences (miscellaneous)
Cited by
9 articles.
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