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Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity includes all branches of the evolutionary tree from single-celled prokaryotic organisms, bacteria, and archaea, to the eukaryotic kingdoms: plants; animals; fungi; and protists. To date, there have been about 1.75 million species identified, and new species are discovered every week.
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Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a...
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La diversidad de especies mejora el funcionamiento del ecosistema a través de la facilitación interespecífica.

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La biodiversidad mejora la productividad del ecosistema a través de la facilitación de las especies. El aumento de la diversidad de insectos acuáticos mejoró el consumo de recursos al alterar el flujo de agua, lo que demuestra un mecanismo clave que vincula la biodiversidad con la función del ecosistema.

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Área de la Ciencia:

  • Ecología Ecología Ecología.
  • Ciencias del medio ambiente Ciencias del medio ambiente.
  • Ecología acuática Ecología acuática.

Sus antecedentes:

  • La facilitación de especies es una hipótesis para vincular la biodiversidad con el uso de los recursos del ecosistema y la productividad.
  • La evidencia empírica que apoya directamente esta hipótesis de la facilitación ha estado faltando.

Objetivo del estudio:

  • Proporcionar evidencia empírica directa para el papel de la facilitación de especies en la mediación de la relación entre la biodiversidad y el funcionamiento del ecosistema.
  • Investigar cómo el aumento de la diversidad de especies dentro de un grupo funcional impacta el consumo de recursos y los procesos del ecosistema.

Principales métodos:

  • Manipulación experimental de la riqueza de especies y la uniformidad de las larvas de la mosca cadis que se alimentan en suspensión (Insecta, Trichoptera) en los mesocosmos de corriente.
  • Evaluación de los cambios en la complejidad topográfica del hábitat bentónico y los patrones de flujo cercanos al lecho.
  • Cuantificación del consumo de recursos por diversos conjuntos de larvas en comparación con los monocultivos.

Principales resultados:

  • El aumento de la diversidad de especies de las larvas de la mosca de la calle indujo interacciones facilitadoras.
  • La complejidad topográfica alterada y los patrones de flujo cercanos al lecho mejoraron el éxito individual de la alimentación.
  • Los ensamblajes diversos capturaron una mayor fracción de los recursos suspendidos que los monocultivos debido a la reducción del "sombraje actual".

Conclusiones:

  • La diversidad de especies puede impulsar directamente interacciones facilitadoras, lo que lleva a cambios no aditivos en el consumo de recursos del ecosistema.
  • La facilitación hidrodinámica, impulsada por la biodiversidad, es un mecanismo fundamental con amplia aplicabilidad en los ecosistemas acuáticos y terrestres.
  • Los cambios en la diversidad de especies pueden alterar desproporcionadamente el funcionamiento del ecosistema a través de interacciones de especies alteradas.