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Estequiometría ecoenzimática de la adquisición microbiana de nutrientes orgánicos en el suelo y los sedimentos
Robert L Sinsabaugh1, Brian H Hill, Jennifer J Follstad Shah
1Biology Department, University of New Mexico, Albuquerque, New Mexico 871312, USA. rlsinsab@unm.edu
Nature
|December 17, 2009
Resumen
Las comunidades microbianas en suelos y sedimentos exhiben una proporción constante de carbono: nitrógeno: fósforo (C: N: P) en sus actividades enzimáticas. Este hallazgo revela una estequiometría funcional universal para la adquisición de nutrientes en diversos ecosistemas.
Área de la Ciencia:
- Ecología Ecología Ecología.
- Biogeoquímica La biogeoquímica es la bioquímica.
- Microbiología Microbiología.
Sus antecedentes:
- La estequiometría elemental, particularmente las relaciones carbono: nitrógeno: fósforo (C: N: P), es crucial para comprender las funciones microbianas en la producción del ecosistema y el ciclo de los nutrientes.
- La biomasa microbiana forma la base de las redes alimenticias detrituales, por lo que su composición elemental es fundamental para la dinámica del ecosistema.
Objetivo del estudio:
- Investigar la estequiometría funcional de las comunidades microbianas heterotróficas en suelos terrestres y sedimentos de agua dulce.
- Para determinar si diversas comunidades microbianas comparten proporciones elementales comunes relacionadas con la adquisición de nutrientes.
Principales métodos:
- Evaluó las actividades de cuatro enzimas clave involucradas en la hidrólisis de las fuentes de carbono (C), nitrógeno (N) y fósforo (P).
- Actividad enzimática analizada que escala las relaciones entre diferentes hábitats y condiciones ambientales.
Principales resultados:
- Las comunidades microbianas heterotróficas de diversos entornos terrestres y de agua dulce demostraron una estequiometría funcional común.
- Las actividades enzimáticas relacionadas con la adquisición de C, N y P exhibieron relaciones de escala similar, con una relación media de actividad C: N: P cercana a 1: 1: 1 en todos los hábitats.
- Estas relaciones ecoenzimáticas se vincularon con la composición de la biomasa microbiana y las eficiencias de asimilación de nutrientes.
Conclusiones:
- Las relaciones ecoenzimáticas observadas reflejan un equilibrio entre las necesidades elementales microbianas y la disponibilidad de recursos.
- Las actividades ecoenzimáticas proporcionan una métrica funcional que une las teorías ecológicas estequiométricas y metabólicas.
- Esta métrica indica el umbral crítico donde el metabolismo del ecosistema cambia de la limitación de nutrientes a la limitación de energía.
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