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Titre du document / Document title

Distribution, production, and ecophysiology of Picocystis strain ML in Mono Lake, California

Auteur(s) / Author(s)

ROESLER Collin S. (1) ; CULBERTSON Charles W. (2) ; ETHERIDGE Stacey M. (1) ; GOERICKE Ralf (3) ; KIENE Ronald P. (4) ; MILLER Laurence G. (2) ; OREMLAND Ronald S. (2) ;

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

(1) Department of Marine Sciences, University of Connecticut, Groton, Connecticut 06340, ETATS-UNIS
(2) Water Resources Division, USGS, Menlo Park, California 94025, ETATS-UNIS
(3) Scripps Institution of Oceanography, La Jolla, California 92093, ETATS-UNIS
(4) University of South Alabama, Mobile, Alabama 36688, ETATS-UNIS

Résumé / Abstract

A recently described unicellular chlorophytic alga isolated from meromictic Mono Lake, California, occupies a niche that spans two environments: the upper oxic mixolimnion and the deeper anoxic and highly reducing monimolimnion. This organism, Picocystis sp. strain ML, accounts for nearly 25% of the primary production during the winter bloom and more than 50% at other times of the year. In incubations, it is heavily grazed by the brine shrimp, Artemia monica. We assessed growth and photosynthetic parameters over broad ranges of irradiance, salinity, and pH and under oxic and anoxic conditions. Picocystis appears to be particularly adapted to low irradiance; we observed an order of magnitude increase in the cellular pigment concentrations, as well as marked increases in cell-specific photosynthetic parameters for cells acclimated to low-growth irradiance. Growth rates of 0.3-1.5 d-1 were observed over a salinity range of 0-260%o and a pH range of 4-12, with maximal growth at ∼50 μmol photons m-2 s-1, 40‰, and pH 6-10. Growth and oxygenic photosynthesis were observed under anoxic conditions at rates comparable to those measured under oxic conditions. The ability of the organism to acclimate and grow under such a broad range of environmental conditions makes it an important component of the Mono Lake ecosystem and likely contributes to its dominance of the monimolimnion/mixolimnion interface.

Revue / Journal Title

Limnology and oceanography    ISSN  0024-3590   CODEN LIOCAH 

Source / Source

2002, vol. 47, no2, pp. 440-452 (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

American Society of Limnology and Oceanography, Waco, TX, ETATS-UNIS  (1956) (Revue)

Mots-clés anglais / English Keywords

Thallophyta

;

Algae

;

Freshwater environment

;

America

;

North America

;

United States

;

California

;

Niche

;

Primary productivity

;

Pigments

;

Lakes

;

Ecophysiology

;

Spatial distribution

;

Mots-clés français / French Keywords

Thallophyta

;

Algae

;

Milieu eau douce

;

Amérique

;

Amérique du Nord

;

Etats Unis

;

Picocystis

;

Californie

;

Niche écologique

;

Productivité primaire

;

Pigment

;

Lac

;

Ecophysiologie

;

Répartition spatiale

;

Mots-clés espagnols / Spanish Keywords

Thallophyta

;

Algae

;

Medio agua dulce

;

America

;

America del norte

;

Estados Unidos

;

California

;

Nicho ecológico

;

Productividad primaria

;

Pigmento

;

Lago

;

Ecofisiología

;

Distribución espacial

;

Localisation / Location

INIST-CNRS, Cote INIST : 2892, 35400010090711.0100

Nº notice refdoc (ud4) : 13589491



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