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La asamblea estocástica de la comunidad causa una mayor biodiversidad en entornos más productivos
1Department of Biology and Tyson Research Center, Washington University, St. Louis, MO 63130, USA. jchase@wustl.edu
Science (New York, N.Y.)
|May 29, 2010
Resumen
Una mayor productividad aumenta la biodiversidad al mejorar los procesos estocásticos, lo que lleva a más especies. Esto ocurre debido a los efectos de prioridad más fuertes, creando múltiples equilibrios comunitarios estables en los ecosistemas.
Área de la Ciencia:
- Ecología Ecología Ecología.
- Biodiversidad Ciencia Ciencia de la biodiversidad.
- Ecología comunitaria Ecología comunitaria.
Sus antecedentes:
- La productividad primaria neta es un motor clave de la biodiversidad, con regiones de mayor productividad que generalmente apoyan a más especies.
- La diversidad beta, o variación de composición entre sitios, aumenta con la productividad, pero los mecanismos subyacentes siguen sin estar claros.
Objetivo del estudio:
- Investigar los mecanismos que impulsan la relación entre la productividad y la diversidad beta.
- Para determinar cómo los procesos de ensamblaje ecológico cambian a lo largo de un gradiente de productividad.
Principales métodos:
- Se utilizaron datos de un experimento a largo plazo realizado en estanques replicados.
- Analizó los cambios en la importancia relativa de los procesos estocásticos versus deterministas de la asamblea de la comunidad.
Principales resultados:
- Una mayor productividad se asoció con un aumento de la diversidad beta.
- Este aumento en la diversidad beta se debió a una mayor influencia de los procesos de ensamblaje estocástico en relación con los deterministas a medida que aumentaba la productividad.
- El cambio observado en los mecanismos de ensamblaje se alinea con la hipótesis de efectos intensificados de prioridad en una mayor productividad, lo que podría conducir a múltiples equilibrios estables.
Conclusiones:
- Los cambios en los mecanismos de reunión de la comunidad, particularmente el mayor papel de la estocástica y los efectos de prioridad, pueden explicar los prominentes gradientes de biodiversidad observados en los gradientes de productividad.
- Comprender estos mecanismos es crucial para predecir los patrones de biodiversidad en respuesta a los cambios ambientales.
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