Abstract
Mutualistic and antagonistic interactions coexist in nature. However, little is understood about their relative roles and interactive effects on multispecies coexistence. Here, using a three-species population dynamics model of a resource species, its exploiter, and a mutualist species, we show that a mixture of different interaction types may lead to dynamics that differ completely from those of the isolated interacting pairs. More specifically, a combination of globally stable antagonistic and mutualistic subsystems can lead to unstable population oscillations, suggesting the potential difficulty in the coexistence of antagonism and mutualism. Mutualism-induced instability arises from the indirect positive effect of mutualism on the exploiter. Furthermore, for a three-species system with a stronger mutualistic interaction to persist stably, a weaker antagonistic interaction is required. Network studies of communities composed of one type of interaction may not capture the dynamics of natural communities.
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Acknowledgments
This study was supported by the Environment Research and Technology Development Fund (D-1102) of the Ministry of the Environment, Japan, by a Grant-in-Aid for Scientific Research (B) (#20370009), by a Grant-in-Aid for Young Scientists (B) (#25840164), and by a Grant-in-Aid for Challenging Exploratory Research (#23657019) from the Japan Society for the Promotion of Science.
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Akihoko Mougi is the recipient of the 6th Population Ecology Young Scientist Award.
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Mougi, A., Kondoh, M. Instability of a hybrid module of antagonistic and mutualistic interactions. Popul Ecol 56, 257–263 (2014). https://doi.org/10.1007/s10144-014-0430-9
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DOI: https://doi.org/10.1007/s10144-014-0430-9