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La evidencia isotópica de carbono estable para la limitación de carbono en el vestíbulo de ventilación hidrotermal es
Science (New York, N.Y.)
|March 2, 1990
Resumen
Los vestimentiferos de respiraderos hidrotermales exhiben proporciones sorprendentemente altas de isótopos de carbono (valores delta ((13) C), que difieren de otros animales con endosimbiontes quimioautotróficos. Esto sugiere que la limitación del carbono inorgánico impacta sus fuentes de carbono nutricional.
Área de la Ciencia:
- Biología Marina Biología Marina.
- La geoquímica es la geoquímica.
- Ecología de Isótopos Ecología de Isótopos.
Sus antecedentes:
- La composición de isótopos estables de carbono (delta 13C) revela fuentes de carbono nutricional de los animales.
- Los animales con endosimbiontes quimioautotróficos suelen mostrar valores negativos de delta ((13) C debido a la asimilación del carbono.
- Los vestimentiferanos de respiraderos hidrotermales (HTV) presentan valores inusualmente altos de delta 13C en comparación con las especies relacionadas.
Objetivo del estudio:
- Investigar las razones detrás de los elevados valores de delta ((13) C en HTV vestimentiferans.
- Pruebe la hipótesis de que la limitación del carbono inorgánico influye en la fijación del carbono en estos organismos.
- Explorar la relación entre el tamaño del animal y los valores de delta ((13) C.
Principales métodos:
- Análisis de la composición de isótopos estables de carbono (delta) en tejidos vestimentarios.
- Comparación de los valores de delta ((13) C en diferentes tamaños de dos especies vestimentarias de HTV.
- Evaluación de las limitaciones potenciales de fijación de carbono basadas en datos isotópicos.
Principales resultados:
- Los vestimentiferos HTV muestran valores de delta (((13) C significativamente más altos que otros invertebrados con endosimbiontes quimioautotróficos.
- Los valores del tejido delta (((13) C aumentan con el tamaño de los animales estudiados.
- La tendencia observada apoya la limitación del carbono inorgánico como un factor en la fijación de carbono.
Conclusiones:
- Los altos valores de delta ((13) C en las vestimentiferas HTV probablemente se deben a la limitación de carbono inorgánico durante la fijación de carbono.
- Las diferencias geométricas de escala en el intercambio de gases y el volumen de trofosomas pueden influir en la eficiencia de la fijación de carbono en individuos más pequeños.
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