Effects of macaque ingestion were examined on both seed destruction during passage through the gut and germination enhancement after defecation, using typically endozoochorous fruits of Eurya emarginata. Mechanical and chemical actions associated with the ingestion were also examined. A fruit-feeding experiment found that 4.4% of ingested seeds could pass intact through the gut of Japanese macaques. No significant difference was detected between the seed passage percentages of six Eurya emarginata trees despite individual variation in seed weight and hardness, implying that mastication is a major factor in the severe seed mortality during the gut passage. Seeds in intact fruits showed lower germination percentage and longer germination delay than seeds with the flesh removed artificially. In contrast, no enhancement in germination was observed after passage through the gut. A series of seed treatment experiments indicated that seed abrasion did not affect germination percentage, though acid and heat-exposure enhanced the germination. The two factors, severe seed destruction and germination enhancement by flesh removal, opposed each other. With the survival proportion of uningested seeds taken as 1.0, the survival proportion of ingested seeds was estimated as 0.49 with the 95% confidence interval of 0.14–1.46, which indicated no significant difference between the proportions of ingested- and uningested-seeds.
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References
Agami M. & Waisel Y. (1988) The role of fish in distribution and germination of seeds of the submerged macrophytes Najas marina L. and Ruppia maritima L. Oecologia 76: 83–88.
Agetsuma N. & Noma N. (1995) Rapid shifting of foraging pattern by Yakushima Macaques (Macaca fuscata yakui) in response to heavy fruiting of Myrica rubra. International Journal of Primatology 16: 247–260.
Barnea A., Yom-Tov Y. & Friedman J. (1990) Differential germination of two closely related species of Solanum in response to bird ingestion. Oikos 57: 222–228.
Barnea A., Yom-Tov Y. & Friedman J. (1991) Does ingestion by birds affect seed germination? Functional Ecology 5: 394–402.
Farber J. M., Daley E., Coates F., Beausoleil N. & Fournier J. (1991) Feeding trials of Listeria monocytogenes with a nonhuman primate model. Journal of Clinical Microbiology 29: 2606–2608.
Fukui A. W. (1995) The role of the Brown-Eared Bulbul Hypsypetes amaurotis as a seed dispersal agent. Researches on Population Ecology 37: 211–218.
Hill D. A. (1997) Seasonal variation in the feeding behavior and diet of Japanese macaques (Macaca fuscata yakui) in lowland forest of Yakushima. American Journal of Primatology 43: 305–322.
Hill D. A., Lucas P. W. & Cheng P. Y. (1995) Bite forces used by Japanese macaques (Macaca fuscata yakui) on Yakushima Island, Japan to open aphid-induced galls on Distylium racemosum (Hamamelidaceae). Journal of Zoology 237: 57–63.
Izhaki I., Korine C. & Arad Z. (1995) The effect of bat (Rousettus aegyptiacus) dispersal on seed germination in eastern Mediterranean habitats. Oecologia 101: 335–342.
Izhaki I. & Safriel U. N. (1990) The effect of some mediterranean scrubland frugivores upon germination patterns. Journal of Ecology 78: 56–65.
Lambert J. E. (1998) Primate digestion: interactions among anatomy, physiology, and feeding ecology. Evolutionary Anthropology 7: 8–20.
Lucas P. W. & Corlett R. T. (1998) Seed dispersal by long-tailed macaques. American Journal of Primatology 45: 29–44.
Maruhashi T. (1980) Feeding behavior and diet of the Japanese monkey (Macaca fuscata yakui) on Yakushima Island, Japan. Primates 21: 141–160.
Milton K. (1981) Food choice and digestive strategies of two sympatric primate species. American Naturalist 117: 496–505.
Murphy S. R., Reid N., Yan Z. & Venables W. N. (1993) Differential passage time of mistletoe fruits through the gut of honeyeaters and flowerpeckers: effects on seedling establishment. Oecologia 93: 171–176.
Nigi H. (1982) Sexual Physiology of Japanese Macaque. Doubutsu-sha, Tokyo. (In Japanese).
Otani T. (2003) Seed dispersal and predation of fleshy-fruited plants by Japanese macaques in the cool temperate zone of northern Japan. Mammal Study 28: 153–156.
Otani T. & Shibata E. (2000) Seed dispersal and predation by Yakushima macaques, Macaca fuscata yakui, in a warm temperate forest of Yakushima Island, southern Japan. Ecological Research 15: 133–144.
Remis M. J. (2000) Initial studies on the contributions of body size and gastrointestinal passage rates to dietary flexibility among gorillas. American Journal of Physical Anthropology 112: 171–180.
Schabacker J. & Curio E. (2000) Fruit characteristics as determinants of gut passage in a bulbul (Hypsipetes philippinus). Ecotropica 6: 157–168.
Takasaki H. (1981) Troop size, habitat quality, and home range area in Japanese macaques. Behavioral Ecology and Sociobiology 9: 277–281.
Traveset A. (1998) Effect of seed passage through vertebrate frugivores’ guts on germination: a review. Perspectives in Plant Ecology, Evolution and Systematics 1/2: 151–190.
Traveset A., Riera N. & Mas R. E. (2001) Passage through bird guts causes interspecific differences in seed germination characteristics. Functional Ecology 15: 669–675.
Wahaj S. A., Levey D. J., Sanders A. K. & Cipollini M. L. (1998) Control of gut retention time by secondary metabolites in ripe Solanum fruits. Ecology 79: 2309–2319.
Yagihashi T., Hayashida M., Miyamoto T. (1998) Effects of bird ingestion on seed germination of Sorbus commixta. Oecologia 114: 209–212.
Yagihashi T., Hayashida M. & Miyamoto T. (1999) Effects of bird ingestion on seed germination of two Prunus species with different fruit-ripening seasons. Ecological Research 14: 71–76.
Yumoto T., Noma N. & Maruhashi T. (1998) Cheek-pouch dispersal of seeds by Japanese monkeys (Macaca fuscata yakui) on Yakushima island, Japan. Primates 39: 325–338.
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OTANI, T. Effects of macaque ingestion on seed destruction and germination of a fleshy-fruited tree, Eurya emarginata. Ecol Res 19, 495–501 (2004). https://doi.org/10.1111/j.1440-1703.2004.00663.x
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DOI: https://doi.org/10.1111/j.1440-1703.2004.00663.x