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Titre du document / Document title

The effects of temperature and light on two algal populations in the temperate sea anemone Anthopleura elegantissima (Brandt, 1835)

Auteur(s) / Author(s)

SAUNDERS B. K. (1) ; MULLER PARKER G. (1) ;

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

(1) Department of Biology, Western Washington University, Bellingham WA, ETATS-UNIS

Résumé / Abstract

Copyright (c) 1997 Elsevier Science B.V. All rights reserved. The effects of temperature (13°C and 20°C) and irradiance (low light (LL)=10 μmol/m2/s; high light (HL)=137 μmol/m2/s) on the population density of two symbiotic algae in the tentacle region of the intertidal sea anemone Anthopleura elegantissima (Brandt) were examined in this study. Anemones contained zooxanthellae (brown anemones), zoochlorellae (green anemones), or a mixture of both algae (mixed anemones). Temperature and light have different effects on zooxanthellae and zoochlorellae, resulting in changes in the algal complement of A. elegantissima. High temperature caused a significant decrease in the density of zoochlorellae over 25 days (in green anemones: −32 and −20 algae/μg tentacle protein per day under HL and LL, respectively) and a reduction in algal mitotic index (from 15% to <5% cells dividing after 6 days). Low light caused a significant increase in the density of zooxanthellae over 25 days (in brown anemones: +15 and +20 algae/μg tentacle protein per day at 13°C and 20°C, respectively). Overall, temperature had a greater effect than light on the population density of algae in the tentacles of A. elegantissima; the percent change in zoochlorellae density in tentacles of anemones held at 20°C was significantly less (in green anemones, −69%) than changes obtained with all other symbiont−temperature interactions. Zooxanthellae and zoochlorellae in mixed anemone tentacles showed the same population density response to the treatments as zooxanthellae and zoochlorellae in brown and green anemones, respectively. Population densities of both algal symbionts are regulated by temperature and light, and the relative abundance of each alga in a host anemone may be shifted with changes in these environmental factors.

Revue / Journal Title

Journal of experimental marine biology and ecology    ISSN  0022-0981   CODEN JEMBAM 

Source / Source

1997, vol. 211, no2, pp. 213-224

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1967) (Revue)

Mots-clés anglais / English Keywords

Symbiosis

;

Mitotic index

;

Temperature

;

Irradiance

;

Light

;

Environmental factor

;

Population density

;

Animal plant relation

;

Marine environment

;

Anthopleura elegantissima

;

Cnidaria

;

Coelenterata

;

Invertebrata

;

Pyrrophycophyta

;

Algae

;

Thallophyta

;

Mots-clés français / French Keywords

Symbiose

;

Indice mitotique

;

Température

;

Eclairement énergétique

;

Lumière

;

Facteur milieu

;

Densité population

;

Relation animal végétal

;

Milieu marin

;

Anthopleura elegantissima

;

Zoochlorellae

;

Zooxanthellae

;

Cnidaria

;

Coelenterata

;

Invertebrata

;

Pyrrophycophyta

;

Algae

;

Thallophyta

;

Mots-clés espagnols / Spanish Keywords

Simbiosis

;

Indice mitótico

;

Temperatura

;

Aclaramiento energético

;

Luz

;

Factor medio

;

Densidad población

;

Relación animal vegetal

;

Medio marino

;

Anthopleura elegantissima

;

Cnidaria

;

Coelenterata

;

Invertebrata

;

Pyrrophycophyta

;

Algae

;

Thallophyta

;

Localisation / Location

INIST-CNRS, Cote INIST : 7185, 35400006147418.0008

Nº notice refdoc (ud4) : 2690500



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