Abstract
This study considers a situation in which a predator can change its dispersal rate according to its satisfaction with foraging prey in a predator–prey interaction. However, since it is impossible to accurately determine the magnitude of the density of prey that is favorable to a predator’s survival in an area, the predator determines the movement rate through inaccurate judgment. In this situation, we investigate the effect of the predator’s decision about its movement on fitness. To achieve our goal, we consider a predator–prey model with nonuniform predator dispersal, called prey-induced dispersal (PYID), in which the spread of predators is small when the prey density is larger than a certain value, and when the prey density is smaller than a particular value, a large spread of predators occurs. To understand how PYID affects the dynamics and coexistence of the system in a spatially heterogeneous region, we examine a model with Holling-type II functional responses under no-flux boundary conditions wherein the predators move according to the PYID. We study the local stability of the semitrivial solution of models with PYID and linear dispersal where the predator is absent. Furthermore, we investigate the local/global bifurcation from the semitrivial solution of models with two different dispersals. We conclude that in most cases, nonuniform dispersal of predators following PYID promotes predator fitness; however, there is a case in which PYID does not increase predator fitness. If a predator’s satisfaction degree regarding the prey density is higher than a certain level, there may exist a case that is not beneficial for predators in terms of their fitness. However, if the satisfaction level of predators regarding prey density is relatively low, predators following PYID will take advantage of fitness. More precisely, if predators are dissatisfied with the amount of prey in a region and move quickly, even for abundant prey density, they may not benefit from PYID. Meanwhile, if predators change their motility when they are appropriately satisfied with the amount of prey, they will obtain a survival advantage. We obtain the results by analyzing an eigenvalue problem at the semitrivial solution from the linearized operators derived from the models.
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Acknowledgements
The authors greatly appreciate the valuable comments and suggestions of anonymous reviewers of this paper which significantly improved the original version. In particular, the authors would like to thank the reviewers for suggesting many references that supported the ecological link for the model considered in the paper. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2020R1F1A1A01054935, and NRF-2019K2A9A2A06025237) and Ministry of Education (NRF-2021R1A6A3A01086879).
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Chang, Y., Choi, W. & Ahn, I. On the Fitness of Predators with Prey-Induced Dispersal in a Habitat with Spatial Heterogeneity. Bull Math Biol 84, 111 (2022). https://doi.org/10.1007/s11538-022-01069-5
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DOI: https://doi.org/10.1007/s11538-022-01069-5