# Host-parasite coevolution in complex landscapes

Saismit Naik, Jhelam Deshpande, Oliver Kaltz, Emanuel A. Fronhofer

► To cite this version:

Saismit Naik, Jhelam Deshpande, Oliver Kaltz, Emanuel A. Fronhofer. Host-parasite coevolution in complex landscapes. Congress of the European Society for Evolutionary Biology, Aug 2025, Barcelone, Spain. . [hal-05299299](https://hal-05299299v1)

HAL Id: [hal-05299299](https://cnrs.hal.science/hal-05299299v1)

Submitted on 6 Oct 2025

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Distributed under a Creative Commons Attribution 4.0 International License
# HOST-PARASITE COEVOLUTION IN COMPLEX LANDSCAPES

SAISMIT NAIK¹, JHELAM N. DESHPANDE², OLIVER KALTZ¹, EMANUEL A. FRONHOFER¹

¹ISEM, Université de Montpellier, CNRS, France, ²University of San Diego, California, USA

## QUESTION

What is the impact of landscape structure on host-parasite coevolution in space?

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## 01 METHOD

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1/0 Resistance/ susceptible allele
1/0 Widely/narrowly infectious allele

## 02 RESULTS

<figure><img src="image_4.png" /><figcaption>Riverine
Landscape
(OCN)</figcaption></figure>

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<figure><img src="image_7.png" /><figcaption>Random
Geometric
Graphs (RGG)</figcaption></figure>

<figure><img src="image_8.png" /></figure>

<figure><img src="image_9.png" /></figure>

### Conclusion

Riverine landscape favor parasite mixing and stabilise host dynamics at intermediate dispersal. Decrease of highly virulent parasite allows for resistance evolution in response.

<figure><img src="image_10.png" /></figure>

<figure><img src="image_11.png" /><figcaption>Dispersal</figcaption></figure>

<figure><img src="image_12.png" /><figcaption>Increased parasite mixing + stabilised host fluctuations</figcaption></figure>

<figure><img src="image_13.png" /><figcaption>Increased host resistance</figcaption></figure>

## 03 ACKNOWLEDGMENT

I would like to thank my supervisor Emanuel Fronhofer and co-author Jhelam Deshpande for their guidance. I would like to thank the EEC lab for their support.

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saismit.naik@umontpellier.fr

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@saismit.bsky.social.