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Los controles sobre la productividad del Océano Pacífico tropical se revelaron a través del diagnóstico de estrés

Michael J Behrenfeld¹, Kirby Worthington, Robert M Sherrell

¹Department of Botany and Plant Pathology, Cordley Hall 2082, Oregon State University, Corvallis, Oregon 97331-2902, USA. mjb@science.oregonstate.edu

|September 1, 2006

Resumen

La disponibilidad de hierro limita el crecimiento del fitoplancton en el Océano Pacífico tropical, particularmente en las zonas de alto nitrato y baja clorofila (HNLC). El nitrógeno y la biomasa de control del pastoreo en las aguas del norte, afectando a las estimaciones generales de productividad oceánica.

Área de la Ciencia:

Biología marina Biología marina.
Oceanografía La oceanografía es la oceanografía.
Biogeoquímica La biogeoquímica es la bioquímica.

Sus antecedentes:

El hierro es un nutriente limitante conocido para el fitoplancton en regiones de alto nitrato y baja clorofila (HNLC).
Los experimentos previos de enriquecimiento in situ fueron limitados en escala y pueden no reflejar la dinámica de la población natural.

Objetivo del estudio:

Evaluar los factores que limitan el crecimiento del fitoplancton a través del Océano Pacífico tropical utilizando nuevas técnicas de fluorescencia.
Para establecer relaciones entre la fluorescencia del fitoplancton y las respuestas fisiológicas al estrés nutricional.
Evaluar la regulación del crecimiento del fitoplancton a una escala espacial sin precedentes.

Principales métodos:

Utilizó 12 años de mediciones de fluorescencia para analizar la ecofisiología del fitoplancton.
Delineó tres regímenes ecofisiológicos distintos dentro del Pacífico tropical.
Atribuye fluorescencia específica vinculada a las respuestas fisiológicas del fitoplancton a la limitación de nutrientes.

Principales resultados:

Identificó el hierro como un regulador clave del crecimiento del fitoplancton en aguas ecuatoriales y meridionales HNLC y aguas oligotróficas.
Determinación del nitrógeno y el pastoreo de zooplancton como reguladores primarios de la biomasa en las aguas tropicales del Pacífico norte.
Cuantificó una subestimación potencial de la productividad del Pacífico tropical en 1.2-2.5 Pg C yr ((-1).

Conclusiones:

El crecimiento del fitoplancton en el Pacífico tropical está regulado por diferentes factores en diferentes regiones.
El hierro, el nitrógeno y el pastoreo interactúan para controlar la productividad del océano.
Las estimaciones de productividad revisadas tienen implicaciones significativas para la comprensión del ciclo del carbono oceánico y los impactos del cambio climático.

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