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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Variations in eelgrass (Zostera marina L.) morphology and internal nutrient composition as influenced by increased temperature and water column nitrate
Auteurs :	B. W. Touchette, Auteur ; J. M. Burkholder, Auteur ; H. B. Glasgow, Auteur
Type de document :	Article
Dans :	Estuaries (26(1) FEB 2003)
Article en page(s) :	142-155
Résumé :	In an experimental mesocosm system, we evaluated changes in morphology and tissue nutrient content (carbon [C], nitrogen [N], phosphorus [P]) of eelgrass (Zostera marina L.) as influenced by increased temperature and nitrate. During the late summer-fall growing season (14 weeks, August through mid-November), control plants were compared to plants grown at elevated temperatures (3degreesC to 4degreesC above ambient, based on 20-yr weekly means) and elevated water column nitrate enrichment (8 muM NO(3)(-), pulsed daily). Both increased temperature and increased nitrate led to declines in shoot density (by 40% and 48% for nitrate and temperature treatments, respectively), as well as decreased leaf and root production. High temperature promoted increased total C. content of leaf tissues, whereas high nitrate increased the percentage of N in belowground tissues and depressed the C:N ratio in aboveground tissues. The data indicated that increases in nitrate or temperature can significantly reduce the size of Z. marina shoots and can also alter the internal C and N content. This reduction was not associated with significant increases in light-attenuating algae as we controlled epiphytic growth, so we suggest that a direct physiological mechanism or other mechanism was involved.

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