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Migration and tolerance shape host behavior and response to parasites infection

Citation

Kim, Dongmin; Shaw, Allison (2021), Migration and tolerance shape host behavior and response to parasites infection, Dryad, Dataset, https://doi.org/10.5061/dryad.nzs7h44rg

Abstract

Numerous theoretical models have demonstrated that migration, a seasonal animal movement behavior, can minimize the risks and costs of parasite infection. Past work on migration-infection interactions assumes migration is the only strategy available to organisms for dealing with the parasite infection, that is they migrate to a different environment to recover or escape from infection. Thus, migration is similar to the non-spatial strategy of resistance, where hosts prevent infection or kill parasites once infected. However, an alternative defense strategy is to tolerate the infection and experience a lower cost to the infection. To our knowledge, no studies have examined how migration can change based on combining two host strategies (migration and tolerance) for dealing with parasites. In this paper, we aim to understand how both parasite transmission and infection tolerance can influence the host’s migratory behavior.

We constructed a model that incorporates two host strategies (migration and tolerance) to understand whether allowing for tolerance affects the proportion of the population that migrates at equilibrium in response to infection.

We show that the benefits of tolerance can either decrease or increase the host’s migration. Also, if the benefit of migration is great, then individuals are more likely to migrate regardless of the presence of tolerance. Finally, we find that the transmission rate of parasite infection can either decrease or increase the tolerant host’s migration, depending on the cost of migration.

These findings highlight that adopting two defense strategies is not always beneficial for the hosts. Instead, a single strategy is often better, depending on the costs and benefits of the strategies and infection pressures. Our work further suggests that multiple host-defense strategies as a potential explanation for the evolution of migration to minimize the parasite infection. Moreover, migration can also affect the ecological and evolutionary dynamics of parasite-host interactions. 

Usage Notes

Figure 2 folder [files]

  • gammas_only_cm.R - codes for creating a figure (2a)
  • alpha_only_cm.R - codes for creating a figure (2b)
  • figure2.Rmd - codes for combining all the figures (2a, 2b, 2c) together

Figure 3 folder [files]

  • cT_cM.R - codes for creating a figure (3a)
  • figure3.Rmd - codes for creating a figure 3 including code for figure (3b).

Figure 4 folder [files]

  • figure4.Rmd - codes for creating a figure 4.

Figure 5 folder [files]

  • fig5a.R- codes for creating a figure (5a)
  • fig5b.R- codes for creating a figure (5b)
  • figure5.Rmd - codes for combining all the figures (5a & 5b) together

Funding

National Science Foundation, Award: DEB-1654609