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Seed dispersal distances by ant partners reflect preferential recruitment patterns in two ant-dispersed sedges

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Abstract

An important feature of seed dispersal mutualism is the differentiation of dispersal-related seed traits (dispersal syndrome), which potentially contribute to partitioning of both seed dispersers and regeneration sites among sympatric plants. Yet, the selective factors underlying the diversity in dispersal syndromes are largely unknown. The differential requirements for seed dispersal distances are often proposed as a main factor in plant adaptations to disperser animals. Focusing on two sympatric ant-dispersed sedges Carex lanceolata and Carex tristachya (Cyperaceae), we tested the association of the adaptation to different dispersers with requirements for seed dispersal distances. We found that C. lanceolata was more frequently dispersed by the large ant Formica japonica (which had relatively long dispersal distances compared with other smaller ants) than by C. tristachya, and this was caused by the higher seed attractiveness of C. lanceolata to F. japonica. Pot experiments manipulating adult-to-seedling distances showed that isolation from conspecific adults only benefited C. lanceolata seedlings, and C. tristachya seedlings were not affected. These results support the importance of differential requirements for seed dispersal distances as a factor underlying the diversity in dispersal syndromes among animal-dispersed plants.

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Acknowledgments

We sincerely thank Dr. Akira Yamawo for his valuable comments that substantially improved our manuscript. We are grateful to the members of the Laboratory of Systems Ecology, Saga University, for their help in setting up the pot experiments.

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Correspondence to Koki Tanaka.

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Tanaka, K., Tokuda, M. Seed dispersal distances by ant partners reflect preferential recruitment patterns in two ant-dispersed sedges. Evol Ecol 30, 943–952 (2016). https://doi.org/10.1007/s10682-016-9846-3

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