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Titre du document / Document title

Microphytobenthic potential productivity estimated in three tidal embayments of the San Francisco bay: A comparative study

Auteur(s) / Author(s)

GUARINI Jean-Marc (1) ; CLOERN James E. (2) ; EDMUNDS Jody (2) ; GROS Philippe (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Centre de Recherche sur les Écosystèmes Marins et Acquacoles-UMR 10 CNRS/IFREMER, BP 5, 17137 L'Houmeau, FRANCE
(2) U.S. Geological Survey, Water Resources Division-MS 496, 345 Middlefield Road, Menlo Park, California 94025, FRANCE
(3) IFREMER-Centre de Nantes, DRV/D, Rue de l'Ile d'Yeu, BP 21105, 44311 Nantes, FRANCE

Résumé / Abstract

In this paper we describe a three-step procedure to infer the spatial heterogeneity in microphytobenthos primary productivity at the scale of tidal estuaries and embayments. The first step involves local measurement of the carbon assimilation rate of benthic microalgae to determine the parameters of the photosynthesis-irradiance (P-E) curves (using non-linear optimization methods). In the next step, a resampling technique is used to rebuild pseudo-sampling distributions of the local productivity estimates; these provide error estimates for determining the significance level of differences between sites. The third step combines the previous results with deterministic models of tidal elevation and solar irradiance to compute mean and variance of the daily areal primary productivity over an entire intertidal mudflat area within each embayment. This scheme was applied on three different intertidal mudflat regions of the San Francisco Bay estuary during autumn 1998. Microphytobenthos productivity exhibits strong (ca. 3-fold) significant differences among the major sub-basins of San Francisco Bay. This spatial heterogeneity is attributed to two main causes: significant differences in the photosynthetic competence (P-E parameters) of the microphytobenthos in the different sub-basins, and spatial differences in the phase shifts between the tidal and solar cycles controlling the exposure of intertidal areas to sunlight. The procedure is general and can be used in other estuaries to assess the magnitude and patterns of spatial variability of microphytobenthos productivity at the level of the ecosystem.

Revue / Journal Title

Estuaries    ISSN  0160-8347   CODEN ESTUDO 

Source / Source

2002, vol. 25, no3, pp. 409-417 (27 ref.)

Langue / Language

Anglais

Editeur / Publisher

Estuarine Research Federation, Lawrence, KS, ETATS-UNIS  (1978-2005) (Revue)

Mots-clés anglais / English Keywords

Thallophyta

;

Marine environment

;

Pacific Ocean

;

America

;

North America

;

United States

;

San Francisco Bay

;

Algae

;

East Pacific

;

California

;

Spatial variability

;

Bay

;

Comparative study

;

Intertidal zone

;

Phytobenthos

;

Primary productivity

;

Mots-clés français / French Keywords

Thallophyta

;

Milieu marin

;

Océan Pacifique

;

Amérique

;

Amérique du Nord

;

Etats Unis

;

Baie San Francisco

;

Mont Sunlight

;

Algae

;

Océan Pacifique est

;

Californie

;

Variabilité spatiale

;

Baie

;

Etude comparative

;

Zone intertidale

;

Phytobenthos

;

Productivité primaire

;

Mots-clés espagnols / Spanish Keywords

Thallophyta

;

Medio marino

;

Océano Pacífico

;

America

;

America del norte

;

Estados Unidos

;

Algae

;

Océano Pacífico Este

;

California

;

Variabilidad espacial

;

Bahía

;

Estudio comparativo

;

Zona intertidal

;

Fitobentos

;

Productividad primaria

;

Localisation / Location

INIST-CNRS, Cote INIST : 8918, 35400010827518.0080

Nº notice refdoc (ud4) : 13790509



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