Abstract

Seagrass monitoring is a basic tool for measuring the condition of meadows in parallel to the environmental conditions. Posidonia oceanica meadows are very sensitive to anthropogenic effects. In the present study, two monitoring stations of Posidonia oceanica meadows were established on the Aegean coasts of Turkey in the years 2018 and 2019, at 26 m depth in Ildır Bay (İzmir, Turkey), and at 33 m depth in Kara Ada (İzmir, Turkey). The P. oceanica meadows upper and lower limits were defined by balisage systems. In the laboratory, lepidochronological, morphometric, and phenological parameters were also studied.

Highlights

  • Posidonia oceanica (L.) Delile (Magnoliophyta) is the most widespread species which is endemic to the Mediterranean Sea [1, 2]

  • Two monitoring stations of Posidonia oceanica meadows were established on the Aegean coasts of Turkey in the years 2018 and 2019, at 26 m depth

  • Two monitoring stations of Posidonia oceanica meadows were established on the Aegean coasts of Turkey as a part of the national Integrated Marine Pollution Monitoring Programme (MoEU, Turkey) (Figure 1)

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Summary

Introduction

Posidonia oceanica (L.) Delile (Magnoliophyta) is the most widespread species which is endemic to the Mediterranean Sea [1, 2]. P. oceanica grows between 0 to 40 meters deep. These meadows constitute a key ecosystem and have an important ecological role. They stabilize the sediment, protect the beaches from erosion and has a positive effect on the clarity of water [3,4,5]. P. oceanica is a perennial species growing vegetatively by means of long-lasting rhizomes [6,7]. Lateral growth of established P. oceanica beds is very slow, i.e. 1÷6 cm yr-1 [8]. According to this growth rate, the expansion from a single seed to a circular bed of 27 m radius would take about 600 years [9]

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