Long-term effect of beach replenishment on natural recovery of shallow Posidonia oceanica meadows

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Title: Long-term effect of beach replenishment on natural recovery of shallow Posidonia oceanica meadows
Authors: González-Correa, José Miguel | Fernández-Torquemada, Yolanda | Sánchez-Lizaso, José Luis
Research Group/s: Biología Marina
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada
Keywords: Recovery | Beach replenishment | Long-term impact | Light | Siltation | Press impact | Posidonia oceanica
Knowledge Area: Biología Marina
Date Created: 2007
Issue Date: 1-Mar-2008
Publisher: Elsevier
Citation: GONZÁLEZ CORREA, José Miguel; FERNÁNDEZ TORQUEMADA, Yolanda; SÁNCHEZ LIZASO, José Luis. “Long-term effect of beach replenishment on natural recovery of shallow Posidonia oceanica meadows”. Estuarine, Coastal and Shelf Science. Vol. 76, Issue 4 (1 March 2008). ISSN 0272-7714, pp. 834-844
Abstract: The recovery capacity of shallow Posidonia oceanica meadows degraded by beach replenishment eighteen years before was assessed in two impacted meadows and compared with other two undisturbed localities. Inside each locality, we selected randomly three sites separated by 500–1000 m. At site level we study the vitality of P. oceanica meadow assessing the vegetative growth, leaf characteristics, and non-structural carbohydrates of the plants. Additionally, at locality level, silt-clay fraction, organic matter, pH and light intensity incident on the sea bottom were measured to evaluate the environmental conditions. Covering of P. oceanica was significantly lower at the impacted localities while amount of dead “matte” was higher. Leaf production of horizontal rhizomes (14.6 ± 1.11 vs 19.47 ± 1.45 leaves y−1), net total rhizomes recruitment (2.33 ± 0.17 vs 4.3 ± 0.33 branches y−1) and starch concentration (43.625 ± 0.67 vs 54.45 ± 0.74 mg per g of rhizome) at impacted meadows were significantly lower than controls. Leaf features, epiphytes biomass, colonization, elongation and horizontal and vertical rhizome production did not show significant differences. Sediments at impacted localities contained higher silt-clay fraction and higher organic matter load while pH was lower. Light intensity on the sea bottom measured at all localities was over the minimum light requirements estimated for P. oceanica. Our results show that the press impact produced by beach replenishment was enduring in the time slowing natural recovery by 45%. This impact may be related with changes in the sediment features.
URI: http://hdl.handle.net/10045/11313
ISSN: 0272-7714 (Print) | 1096-0015 (Online)
DOI: 10.1016/j.ecss.2007.08.012
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.ecss.2007.08.012
Appears in Collections:INV - BM - Artículos Científicos / Scientific Papers
INV - Recursos Hídricos y Desarrollo Sostenible - Artículos de Revistas

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