Effects of salinity on leaf growth and survival of the Mediterranean seagrass Posidonia oceanica (L.) Delile

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Títol: Effects of salinity on leaf growth and survival of the Mediterranean seagrass Posidonia oceanica (L.) Delile
Autors: Fernández-Torquemada, Yolanda | Sánchez-Lizaso, José Luis
Grups d'investigació o GITE: Biología Marina
Centre, Departament o Servei: Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada
Paraules clau: Desalination impact | Mesocosms | Posidonia oceanica | Salinity stress
Àrees de coneixement: Botánica Marina
Data de creació: 2004
Data de publicació: 15-de juny-2005
Editor: Elsevier
Citació bibliogràfica: FERNÁNDEZ TORQUEMADA, Yolanda; SÁNCHEZ LIZASO, José Luis. “Effects of salinity on leaf growth and survival of the Mediterranean seagrass Posidonia oceanica (L.) Delile”. Journal of Experimental Marine Biology and Ecology. Vol. 320, Issue 1 (15 June 2005). ISSN 0022-0981, pp. 57-63
Resum: The main aim of this study was to estimate the effects of salinity variation on the Mediterranean seagrass Posidonia oceanica (L.) Delile and its attached epiphytes. Leaf growth and survival of this plant were tested in several short-term (15 days) mesocosms experiments under controlled conditions between February 2001 and November 2001. Plants collected from shallow meadows at Alicante (SE Spain), with an ambient salinity of 36.8–38.0 psu, were placed in tanks of 300 L with an additional overhead light and exposed to different salinity treatments (ranging from 25 to 57 psu) during 15 days. To estimate the mortality and growth recuperation, in some experiments shoots were returned to control salinity (38 psu). Leaf growth was measured in the laboratory where epiphytic fauna and flora were removed from leaves, with a razor blade, to determine their biomass. P. oceanica was negatively influenced by increased salinity. Shoots showed a significant decrease in growth and survival, whereas epiphyte biomass did not show a clear response because of their high variability. Maximum leaf growth occurred between 25 and 39 psu. In addition, plants suffered considerable mortality at salinities above 42 psu and below 29 psu, with 100% mortality at 50 psu. In salinities between 39 and 46 psu, surviving plants were able to regain their original growth rate when returned to normal seawater salinity (38 psu). These results suggest that P. oceanica is one of the most sensitive seagrasses to salinity increments it is more tolerant to salinity reductions (25.0–36.4 psu), perhaps due to the terrestrial origin of seagrasses.
Patrocinadors: This research was financed by a CEDEX—A.C. SEGURA contract and by a FPI grant of the Generalitat Valenciana (FPI 01 A 002).
URI: http://hdl.handle.net/10045/7744
ISSN: 0022-0981
DOI: 10.1016/j.jembe.2004.12.019
Idioma: eng
Tipus: info:eu-repo/semantics/article
Revisió científica: si
Versió de l'editor: http://dx.doi.org/10.1016/j.jembe.2004.12.019
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