Abstract
It is well known that in reaction-diffusion models for a single unstructured population in a bounded, static, heterogeneous environment, slower diffusion is advantageous. That is not necessarily the case for stage structured populations. In (Cantrell et al. 2020), it was shown that in a stage structured model introduced by Brown and Lin (1980), there can be situations where faster diffusion is advantageous. In this paper we extend and refine the results of (Cantrell et al. 2020) on persistence to more general combinations of diffusion rates and to cases where either adults or juveniles do not move. We also obtain results on the asymptotic behavior of solutions as diffusion rates go to zero, and on competition between species that differ in their diffusion rates but are otherwise ecologically identical. We find that when the spatial distributions of favorable habitats for adults and juveniles are similar, slow diffusion is still generally advantageous, but if those distributions are different that may no longer be the case.
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Acknowledgements
The research of R.S. Cantrell and C. Cosner was partially supported by NSF Grant DMS - 18-53478. The authors are grateful to the referees for their close reading of the paper and detailed comments, which improved the exposition.
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Dedicated to Mark Lewis on the occasion of his 60th birthday.
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Cantrell, R.S., Cosner, C. & Salako, R.B. Effects of dispersal rates in a two-stage reaction-diffusion system. J. Math. Biol. 86, 41 (2023). https://doi.org/10.1007/s00285-023-01878-9
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DOI: https://doi.org/10.1007/s00285-023-01878-9