How parasite-mediated costs drive the evolution of disease state-dependent dispersal

Iritani, Ryosuke

doi:10.1016/j.ecocom.2014.10.008

Cited by 10 publications

(25 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In conclusion, we show that I -biased, state-dependent dispersal readily evolves in our model and is pervasive. The dispersal bias evolves due to kin selection which is consistent with previous studies (Iritani and Iwasa, 2014; Iritani, 2015).…”

Section: Resultssupporting

confidence: 91%

“…Hence, the dispersal rate evolves in such a way that kin competition is reduced (similar to Hamilton and May, 1977) by being infection state-dependent. Indeed, both Poethke et al (2010) for host-parasitoid and Iritani and Iwasa (2014); Iritani (2015) for host-parasite systems demonstrate that relatedness underlies the evolution of dispersal plasticity in the attacked organism.…”

Section: Resultsmentioning

confidence: 99%

“…Conversely, increased dispersal may reflect manipulation by the parasite to increase parasite dispersal (Lion et al, 2006; Kamo and Boots, 2006), rather than evolution of the host. Evolution of host dispersal plasticity has been studied theoretically by Iritani and Iwasa (2014) and Iritani (2015). They find that ‘infection-biased’ dispersal, that is, increased dispersal when infected, is favoured with increasing probability of recovery during dispersal, with decreasing dispersal costs, and with higher levels of parasite virulence.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Host-parasite dynamics set the ecological theatre for the evolution of state- and context-dependent dispersal in hosts

Deshpande

Kaltz

Fronhofer

2020

Preprint

View full text Add to dashboard Cite

While host-parasite interactions are ubiquitous, the large scale consequences of parasite infections are mainly driven by the spatial context. One trait of pivotal importance for the eco-evolutionary dynamics of such metapopulations is the spatial behaviour of hosts, that is, their dispersal. It is well established that dispersal is not a random process, rather dispersal is informed and may depend on internal and external factors. In host-parasite metapopulations, dispersal may be a function of a host’s infection state, but also of the local context, such as host density or parasite prevalence. Using a dynamical host-parasite metapopulation model, we explore whether host dispersal evolves to be state- and context-dependent and what shapes the evolutionarily stable dispersal reaction norms have. We show that state-dependent dispersal readily evolves in the sense that hosts disperse more when infected. This dispersal bias evolves due to kin selection which is consistent with previous studies. Most importantly, we show that prevalence-dependent dispersal evolves, especially when virulence is high and epidemiological dynamics have predictable signatures. The observed evolutionary outcome, a negatively prevalence-dependent dispersal reaction norm for susceptible hosts, seems counter-intuitive at first. However, our results can be readily explained by the emergent epidemiological dynamics, especially their spatial and temporal correlation patterns. Finally, we show that context-dependency in dispersal may rely on both, prevalence, but also host density cues. Our work provides new insights into the evolution of complex dispersal phenotypes in host-parasite metapopulations as well as on associated feedbacks between ecological dynamics and evolutionary change.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Host-parasite dynamics set the ecological theatre for the evolution of state- and context-dependent dispersal in hosts

Deshpande

Kaltz

Fronhofer

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The association between infection status and increased movements observed among wild toads could arise from two mechanisms; either infection with Rhabdias increases movement by toads, or alternatively, more dispersive toads are also more likely to become infected with Rhabdias. The former mechanism could result from the parasite modifying the activity of the host (Lafferty and Shaw 2013;Webster 1994), perhaps reflecting a selective advantage to the parasite from spreading to new areas (Iritani 2015;Iritani and Iwasa 2014). Alternatively and more intuitively, it may behove an individual host to move away from an area where it has become infected (Hutchings et al 2001).…”

Section: Discussionmentioning

confidence: 94%

“…However, in the wild, sustained rates of movement and dispersal likely are influenced by many factors (e.g., resource availability, habitat openness) that are not incorporated in laboratory studies (Knowles et al 2014;Stevens and Coulon 2012). Modelling and empirical studies have shown that parasites may increase or decrease host dispersal, depending on the circumstances (Iritani 2015;Iritani and Iwasa 2014;Lion et al 2006;Scott 1988). Dispersal can increase following immune system activation or exposure to pathogens, because it may benefit a host to leave areas where the chance of infection is high (Altizer et al 2011;Suhonen et al 2010).…”

Section: Discussionmentioning

confidence: 97%

The impact of lungworm parasites on rates of dispersal of their anuran host, the invasive cane toad

et al. 2015

View full text Add to dashboard Cite

Translocation of native-range parasites to control invasive species is effective only if the parasite substantially impairs either the viability or dispersal rate of the invasive host. Lungworms (Rhabdias pseudosphaerocephala) of cane toads (Rhinella marina) were introduced to Australia from the toad's native range, along with the toads, and have been suggested as a potential biocontrol of invasive toads due to various negative impacts on toad viability. We conducted two radio-telemetry studies on a tropical floodplain to specifically assess the parasite's impact on toad dispersal. First, a retrospective correlative analysis of data from field-collected animals showed that toads infected with lungworms moved farther, not less, than uninfected conspecifics. Second, an experimental study (comparing movements of experimentally infected toads vs. uninfected controls) showed that lungworms did not modify rates of toad dispersal. In addition, experimental infection with lungworms did not elicit an immune response substantial enough to influence dispersal behaviour. Thus, we conclude that increasing lungworm densities at the invasion front as an attempt at biocontrol would not slow down the spread of cane toads.

show abstract

Dispersal evolution and eco-evolutionary dynamics in antagonistic species interactions

Zilio,

Deshpande,

Duncan

et al. 2024

Trends in Ecology & Evolution

View full text Add to dashboard Cite

How parasite-mediated costs drive the evolution of disease state-dependent dispersal

Cited by 10 publications

References 46 publications

Host-parasite dynamics set the ecological theatre for the evolution of state- and context-dependent dispersal in hosts

Host-parasite dynamics set the ecological theatre for the evolution of state- and context-dependent dispersal in hosts

The impact of lungworm parasites on rates of dispersal of their anuran host, the invasive cane toad

Dispersal evolution and eco-evolutionary dynamics in antagonistic species interactions

Contact Info

Product

Resources

About