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A theoretical framework for resource translocation during sexual reproduction in modular organisms

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Abstract

An individual of modular organisms, such as plants and fungi, consists of more than one module that is sometimes physically and physiologically connected with each other. We examined effects of translocation costs, resource–fitness relationships and original resource conditions for modules on the optimal resource translocation strategy for reproductive success in modular organisms with simple models. We considered two types of translocation cost: amount-dependent and ratio-dependent costs. Three optimal resource translocation strategies were recognized: all resource translocation (ART), partial resource translocation (PRT), and no resource translocation (NRT). These strategies depended on the translocation cost, shape of resource–fitness curve, and original resource condition for each module. Generally, a large translocation cost and a concave resource–fitness relationship promoted NRT or PRT. Meanwhile, a small translocation cost and convex resource–fitness relationship facilitated ART. The type of translocation cost did not strongly affect the optimal resource translocation patterns, although ART was never an optimal strategy when the cost was ratio-dependent. Resource translocation patterns found in modular plants were discussed in the light of our model results.

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Acknowledgments

We thank C. K. Kelly, S. F. Hasegawa, K. Kawamura and M. Ikegami for their valuable comments on our early draft of this paper. Two anonymous reviewers offered helpful comments and criticisms to improve our manuscript.

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Authors and Affiliations

  1. Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Kobe, 657-8501, Japan

    Atushi Ushimaru

  2. Graduate School of Kuroshio Science, Kochi University, 2-5-1 Akebono-cho, Kochi, 780-8520, Japan

    Motomi Genkai-Kato

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  1. Atushi Ushimaru
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  2. Motomi Genkai-Kato
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Correspondence to Atushi Ushimaru.

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Ushimaru, A., Genkai-Kato, M. A theoretical framework for resource translocation during sexual reproduction in modular organisms. Evol Ecol 25, 885–898 (2011). https://doi.org/10.1007/s10682-010-9433-y

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