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Intraspecific differences in seed dispersal caused by differences in social rank and mediated by food availability

Tsuji, Y and Campos-Arceiz, A and Prasad, S and Kitamura, S and McConkey, KR (2020) Intraspecific differences in seed dispersal caused by differences in social rank and mediated by food availability. In: Scientific Reports, 10 (1).

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Official URL: https://dx.doi.org/10.1038/s41598-020-58381-0


We use individual-based information on the behavior of wild female Japanese macaques in two consecutive years with different food availability (nut-rich vs. nut-poor) to test effects of dominance rank and nut fruiting on seed dispersal parameters. We predicted that social rank would affect dispersal (1) quantity, (2) quality, (3) species richness, and (4) percentage of berries in the diet in the nut-poor year, while these differences would disappear in the nut-rich year. We found seeds of nine fleshy-fruited plant species in the feces of the monkeys. The frequency of seed occurrence for two plant species (Viburnum dilatatum and Rosa multiflora) showed an interaction between dominance ranks and years; in the nut-poor year V. dilatatum seeds were more abundant among dominant females and R. multiflora among subordinates, while such inter-rank differences disappeared in the nut-rich year. Similarly, the intact ratio of V. dilatatum seeds was lower for dominants in the nut-poor year, while inter-rank variations disappeared in the nut-rich year. Finally, percentage of berries in diet and seed richness showed no inter-annual nor inter-rank variations. Our study highlights that differences in individuals� social rank lead to within-group variation in seed dispersal services and that these differences are dependent on nut availability.

Item Type: Journal Article
Publication: Scientific Reports
Publisher: Nature Research
Additional Information: The copyright of this article belongs to Nature Research
Keywords: adult; article; berry; case report; clinical article; diet; feces; female; food availability; fruiting; Macaca fuscata; nonhuman; nut; seed dispersal; social status; species richness; Viburnum
Department/Centre: Others
Date Deposited: 11 Mar 2020 09:34
Last Modified: 11 Mar 2020 09:34
URI: http://eprints.iisc.ac.in/id/eprint/64744

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