Posidonia oceanica litter along the Mediterranean Coast of Egypt: Status and a preliminary assessment of nutrients and trace elements contents

Abstract

Abstract Deposits of the endemic Mediterranean seagrass, Posidonia oceanica , are usually found covering the fronts of sandy beaches. In Egypt, these deposits are thought of as waste and subjected to removal by heavy machinery. The current study provides the first report on the status and distribution of P. oceanica deposits along the Mediterranean Coast of Egypt, in addition to an assessment of trace elements (TE), organic carbon (OC), and nutrient contents of some of their banquettes. The results indicate that TE concentrations of P. oceanica litter and associated sediments and water are acceptable according to the international limits. The results also show that organic matter constituted >10% of P. oceanica litter dry weight, while OC constituted 1.9% similar to that reported for P. oceanica living tissue. A research strategy is needed to assess carbon stocks of P. oceanica meadows and their deposits along the Mediterranean coast of Egypt, in order to set strategies to mitigate climate change based on their carbon storage capacity. Local campaigns should be conducted to increase people's awareness of the importance of P. oceanica to the environment and consequently to their livelihood. • First report on the distribution of P. oceanica deposits in Egypt. • Data on the carbon stocks of P. oceanica meadows in the Mediterranean coast of Egypt is sparse. • Assessment of trace elements and nutrients content of some P. oceanica banquettes in Egypt. • Trace elements content of P. oceanica litter is acceptable according to the international limits. • Organic matter and organic carbon constituted of >10% and 1.9% of P. oceanica litter, resp.