Abstract
Primate seed dispersal has been increasingly recognized as having a potentially profound impact on tropical forest regeneration and plant species composition. Confirming and quantifying this impact, however, has proven to be an important challenge. We review the literature on seed dispersal by howler monkeys (Alouatta spp.) throughout their geographical range and assess the impact for plant populations and communities. Howler monkeys spend ca. 50 % of their feeding time eating fruits from many plant species and different life forms. For some plant species they are probably the only or primary dispersal agent (e.g., fruits with large seeds and/or with hard indehiscent husks), especially in anthropogenically disturbed forests, where other large-bodied frugivores tend to be absent or are locally extinct. In this regard, howlers contribute to secondary succession, aiding in the restoration of degraded habitats. Alouatta spp. swallow most (>90 %) of the seeds they handle, defecating them undamaged. Studies indicate that passage through the howler gut has a positive effect on rates of seed germination. In addition, studies of secondary dispersal indicate that seeds voided in howler dung attract secondary seed dispersers such as rodents and dung beetles. Also, nutrients in the dung may enhance seedling establishment. Although certain components of howler seed dispersal such as seed shadows, post-dispersal seed fate, and seeds/seedlings survival need to be better studied, current information suggests that howler monkeys are effective seed dispersers for many plant species, with important consequences for plant communities and forest regeneration.
Resumen
La dispersión de semillas por primates puede tener un gran impacto potencial sobre la regeneración y composición de especies de plantas en bosques tropicales. Sin embargo, la confirmación y cuantificación de dicho impacto ha constituido un importante reto. Nosotros hacemos una revisión de la literatura sobre dispersión de semillas por monos aulladores (Alouatta spp.) en su rango de distribución geográfica y evaluamos su impacto sobre las poblaciones y comunidades de plantas. Encontramos que los aulladores dedican ca. 50 % de su tiempo a alimentarse de frutos de muchas especies de plantas y varias formas de vida. Ellos pueden ser los únicos o principales dispersores primarios para algunas especies (por ejemplo, frutos con semillas grandes y/o con exocarpo duro e indehiscente), especialmente en bosques perturbados, donde otros frugívoros de tamaño grande tienden a desaparecer. De hecho, estos primates pueden contribuir a la sucesión secundaria, ayudando a la restauración de hábitats degradados. Ellos tragan la mayoría de las semillas que manipulan, defecándolas sin dañarlas. Usualmente, el paso por el tracto digestivo tiene un efecto positivo en la germinación. Además, las semillas que se encuentran en las heces de monos aulladores pueden ser dispersadas por dispersores secundarios como roedores y escarabajos. Sus heces enriquecen el suelo y pueden favorecer el establecimiento de plántulas. Aunque algunos componentes de este mutualismo, como el destino final de las semillas dispersadas y la supervivencia de semillas/plántulas, necesitan ser mejor estudiados, la información actual sugiere que los monos aulladores son dispersores efectivos para muchas especies de plantas, con importantes consecuencias para las comunidades vegetales y la regeneración de bosques.
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Acknowledgments
The Centro de Investigaciones en Ecosistemas (Universidad Nacional Autónoma de México) provided logistical support to V.A.R. and E.A., and CONICET (Consejo Nacional de Investigaciones Científicas y Tecnológicas, Argentina) and the Universidad de Buenos Aires provided financial support to S.P.B. Banco de la República (Colombia), Primate Conservation, Margot Marsh Fund, Colciencias, Ecopetrol, and Universidad de Los Andes have provided funds to P.R.S.
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Arroyo-Rodríguez, V., Andresen, E., Bravo, S.P., Stevenson, P.R. (2015). Seed Dispersal by Howler Monkeys: Current Knowledge, Conservation Implications, and Future Directions. In: Kowalewski, M., Garber, P., Cortés-Ortiz, L., Urbani, B., Youlatos, D. (eds) Howler Monkeys. Developments in Primatology: Progress and Prospects. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1960-4_5
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