Experimentos de oferta de semillas para estimar granivoría y sus errores metodológicos

Autores/as

  • Maria del Mar Weisz Instituto Venezolano de Investigaciones Científicas image/svg+xml Autor/a
  • Jaffet Nassar Instituto Venezolano de Investigaciones Científicas image/svg+xml Autor/a
  • Elizabeth Pérez Universidad Nacional Experimental Simón Rodríguez image/svg+xml Autor/a

Palabras clave:

granivoría, depredación de semillas, remoción de semillas, métodos de exclusión, hormigas, aves, roedores, problemas metodológicos

Resumen

La oferta de semillas ha sido el método más usado en los estudios experimentales de granivoría. Estos experimentos presuponen que las semillas faltantes en cada tratamiento han sido consumidas por los granívoros, y que el consumo experimental es similar al consumo en situaciones naturales. No obstante, estos experimentos son afectados por algunos factores, que van desde la selección de las semillas a ofertar hasta la medición de la variable respuesta, que podrían poner en duda el cumplimiento de al menos uno de dichos supuestos. A pesar de las potenciales fuentes de error que puedan encontrarse en las estimaciones de las tasas de remoción de semillas, es importante tener una idea de la magnitud de semillas que son removidas por los granívoros porque dichas cantidades pueden llegar a afectar la disponibilidad futura de semillas para la regeneración de la vegetación. Ciertamente, muchos aspectos asociados a la estimación de la granivoría merecen ser revisados continuamente para obtener estimados más realistas; pero como se enfatiza en esta revisión, lo importante es que los investigadores estén conscientes de las posibles fuentes de error y ajusten los diseños experimentales en función de minimizar estos efectos.

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14-05-2012

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Experimentos de oferta de semillas para estimar granivoría y sus errores metodológicos. (2012). Ecotropicos, 25, 75-85. http://ecotropicos.svecologia.org/index.php/home/article/view/p0209

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