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La diversidad beta en los árboles de los bosques tropicales.

Richard Condit1, Nigel Pitman, Egbert G Leigh

  • 1Center for Tropical Forest Science, Smithsonian Tropical Research Institute, Unit 0948, APO AA 34002-0948, USA.

Science (New York, N.Y.)
|January 26, 2002
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Resumen

La beta-diversidad de los bosques tropicales, o cómo cambia la composición de las especies con la distancia, es más alta en Panamá que en el oeste de la Amazonia. Los patrones en ambas regiones se desvían de los modelos neutrales, lo que sugiere que la variación del hábitat y la limitación de la dispersión influyen en la rotación de especies.

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Área de la Ciencia:

  • Ecología Ecología Ecología.
  • Biodiversidad Ciencia Ciencia de la biodiversidad.
  • Ecología Forestal Ecología Forestal

Sus antecedentes:

  • La diversidad alfa de los bosques tropicales está bien documentada.
  • La diversidad beta, la variación en la composición de las especies a través de escalas espaciales, es menos comprendida.
  • Comprender la diversidad beta es crucial para la conservación de los bosques tropicales y la teoría ecológica.

Objetivo del estudio:

  • Para estimar cuantitativamente la beta-diversidad de los árboles tropicales en diferentes regiones neotrópicas.
  • Para comparar patrones empíricos de beta-diversidad con predicciones de un modelo neutro.
  • Identificar los factores que influyen en la rotación de especies en los bosques tropicales.

Principales métodos:

  • Comparación de la composición de especies de tierras bajas terra firme parcelas forestales en Panamá, Ecuador y Perú.
  • Utilizando estimaciones cuantitativas de la diversidad beta.
  • Probar las observaciones ecológicas contra las predicciones de un modelo neutral de la rotación de especies.

Principales resultados:

  • La diversidad beta es más alta en Panamá en comparación con el oeste de la Amazonia.
  • Los patrones de diversidad beta observados son inconsistentes con el modelo neutral en ambas regiones.
  • La variación del hábitat en Panamá aumenta la rotación de especies, mientras que el oeste de la Amazonia muestra una rotación inesperadamente baja en grandes distancias.

Conclusiones:

  • La heterogeneidad del hábitat y la limitación de la dispersión, junto con la especiación, son factores clave de la rotación de especies de árboles tropicales.
  • El modelo neutral por sí solo no explica completamente los patrones de diversidad beta observados.
  • Procesos no identificados pueden limitar las densidades de población en especies del oeste de la Amazonía.