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A Practical Guide to Phylogenetics for Nonexperts
Published on: February 6, 2014
El conservadurismo del bioma filogenético a escala mundial
Michael D Crisp1, Mary T K Arroyo, Lyn G Cook
1School of Botany and Zoology, The Australian National University, Canberra, Australian Capital Territory 0200, Australia. mike.crisp@anu.edu.au
Nature
|February 17, 2009
Resumen
Los organismos tienden a permanecer en sus biomas ancestrales, y los cambios en los biomas son raros durante millones de años. Este conservadurismo ecológico influye en la distribución y colonización de las especies, impactando el potencial evolutivo en medio del cambio climático.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- La biogeografía es la biogeografía.
- Ecología Ecología Ecología.
Sus antecedentes:
- Comprender la distribución de los organismos es fundamental para la biología evolutiva.
- El conservadurismo ecológico es conocido a escala local/regional, pero falta evidencia a largo plazo a escala continental.
Objetivo del estudio:
- Evaluar el alcance del conservadurismo ecológico en escalas de tiempo geológicas y a través de continentes.
- Investigar el papel de la estabilidad del bioma frente a los cambios del bioma en la especiación y la colonización.
Principales métodos:
- Biomas ancestrales inferidos para más de 11.000 especies de plantas en todo el hemisferio sur.
- Analizó el conservadurismo del bioma durante la especiación y la colonización transoceánica.
Principales resultados:
- El estancamiento del bioma en la especiación se produjo en una proporción de más de 25:1 en comparación con los cambios del bioma.
- El conservadurismo ecológico también prevaleció en las especies que colonizaron nuevas masas de tierra a través de los océanos.
- La disponibilidad de biomas adecuados influyó significativamente en el establecimiento intercontinental.
Conclusiones:
- El conservadurismo ecológico es una fuerza dominante que da forma a la distribución de las especies a lo largo del tiempo evolutivo.
- La capacidad limitada para los cambios del bioma puede comprometer el potencial evolutivo bajo la contracción del bioma inducida por el cambio climático.
- La rareza de las transiciones entre biomas influye en la composición taxonómica del bioma.
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