Seed Predation in Neotropical Pre-Montane Pastures: Site, Distance, and Species Effects. Jones, F., A., Peterson, C., J., & Haines, B., L. Biotropica, 35(2):219-225, 7, 2003. ![Seed Predation in Neotropical Pre-Montane Pastures: Site, Distance, and Species Effects [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website abstract bibtex We studied patterns of removal and predation on seeds of ten plant species over two years in four abandoned pastures adjacent to forest fragments in Costa Rica. We hypothesized that: (1) removal within pastures would be greater nearest forest fragments and decline at farther distances; (2) removal rates would be greater on smaller-seeded species; and (3) removal rates would differ among pastures. We placed seeds of two species in three pastures in 1997 and eight species in two pastures during 1998. In each pasture, removal was monitored at three distances from the forest edge. Rates of seed removal in 1997 and 1998 were significantly greater 1-5 m from the forest than at 20 m distances, but removal rates at the 40 m distance did not differ from the 1-5 m distance. Rates of removal for both species were low in 1997, although removal was significantly greater for the smaller-seeded species Sorocea trophoides than for the large seeds of Nectandra sp. Removal rates differed significantly among pastures for both species in 1997 and among pastures for five small-seeded species in 1998. No removal of three large-seeded species was detected in 1998. Interspecific differences in seed removal rates were consistent with the hypothesis that larger seeds are removed less in pastures than smaller seeds. While some seed removal patterns appear predictable, species-specific variation in removal within and among sites was substantial. Predator population densities and other among-pasture differences may also influence patterns of spatial variation in seed predation. /// Estudiamos los patrones de remoción y depredación de semillas en diez especies de plantas durante dos años, en cuatro pastizales abandonados adyacentes a fragmentos de bosque en el sur de Costa Rica. Planteamos las siguientes hipótesis: (1) la remoción de semillas de los pastizales será mayor cerca a los bordes de los fragmentos y disminuirá a medida que la distancia al borde aumenta, (2) las tasas de remoción serán mayores para semillas pequeñas, (3) las tasas de remoción diferirán entre los diferentes pastizales. Colocamos semillas de dos especies de plantas en tres pastizales en 1997 y de ocho especies de plantas en dos pastizales en 1998. En cada pastizal monitoreamos la remoción de semillas a tres distancias del borde. Las tasas de remoción en ambos años fueron mayores a 1-5 m del borde que a 20 m, pero no fueron significativamente diferentes de las tasas de remoción a 40 m. La tasa de remoción para ambas especies fue baja en 1997, aunque la remoción fue mayor para la especie con semillas pequeñas (Sorocea trophoides) que para la especie con semillas grandes (Nectandra sp.). Las tasas de remoción para estas especies fueron significativamente diferentes entre los pastizales en 1997 y para 5 especies con semillas pequeñas en 1998. Ese mismo año, no detectamos remocion en ninguna de las 3 especies con semillas grandes. Aunque algunos de estos patrones de remoción de semillas parecen predecibles, hubo una variación substancial a nivel específico dentro y entre pastizales. Sugerimos que la densidad poblacional de los depredadores y otras diferencias bióticas y/o abióticas entre pastizales, pueden influenciar la variación espacial observada en la remoción de semillas.
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title = {Seed Predation in Neotropical Pre-Montane Pastures: Site, Distance, and Species Effects},
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year = {2003},
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abstract = {We studied patterns of removal and predation on seeds of ten plant species over two years in four abandoned pastures adjacent to forest fragments in Costa Rica. We hypothesized that: (1) removal within pastures would be greater nearest forest fragments and decline at farther distances; (2) removal rates would be greater on smaller-seeded species; and (3) removal rates would differ among pastures. We placed seeds of two species in three pastures in 1997 and eight species in two pastures during 1998. In each pasture, removal was monitored at three distances from the forest edge. Rates of seed removal in 1997 and 1998 were significantly greater 1-5 m from the forest than at 20 m distances, but removal rates at the 40 m distance did not differ from the 1-5 m distance. Rates of removal for both species were low in 1997, although removal was significantly greater for the smaller-seeded species Sorocea trophoides than for the large seeds of Nectandra sp. Removal rates differed significantly among pastures for both species in 1997 and among pastures for five small-seeded species in 1998. No removal of three large-seeded species was detected in 1998. Interspecific differences in seed removal rates were consistent with the hypothesis that larger seeds are removed less in pastures than smaller seeds. While some seed removal patterns appear predictable, species-specific variation in removal within and among sites was substantial. Predator population densities and other among-pasture differences may also influence patterns of spatial variation in seed predation. /// Estudiamos los patrones de remoción y depredación de semillas en diez especies de plantas durante dos años, en cuatro pastizales abandonados adyacentes a fragmentos de bosque en el sur de Costa Rica. Planteamos las siguientes hipótesis: (1) la remoción de semillas de los pastizales será mayor cerca a los bordes de los fragmentos y disminuirá a medida que la distancia al borde aumenta, (2) las tasas de remoción serán mayores para semillas pequeñas, (3) las tasas de remoción diferirán entre los diferentes pastizales. Colocamos semillas de dos especies de plantas en tres pastizales en 1997 y de ocho especies de plantas en dos pastizales en 1998. En cada pastizal monitoreamos la remoción de semillas a tres distancias del borde. Las tasas de remoción en ambos años fueron mayores a 1-5 m del borde que a 20 m, pero no fueron significativamente diferentes de las tasas de remoción a 40 m. La tasa de remoción para ambas especies fue baja en 1997, aunque la remoción fue mayor para la especie con semillas pequeñas (Sorocea trophoides) que para la especie con semillas grandes (Nectandra sp.). Las tasas de remoción para estas especies fueron significativamente diferentes entre los pastizales en 1997 y para 5 especies con semillas pequeñas en 1998. Ese mismo año, no detectamos remocion en ninguna de las 3 especies con semillas grandes. Aunque algunos de estos patrones de remoción de semillas parecen predecibles, hubo una variación substancial a nivel específico dentro y entre pastizales. Sugerimos que la densidad poblacional de los depredadores y otras diferencias bióticas y/o abióticas entre pastizales, pueden influenciar la variación espacial observada en la remoción de semillas.},
bibtype = {article},
author = {Jones, F Andrew and Peterson, Chris J and Haines, Bruce L},
journal = {Biotropica},
number = {2}
}
Downloads: 0
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