Climate changes are affecting the fate of Posidonia oceanica meadows. Actually, Mediterranean Sea is threatened by abiotic, biotic and climate coupled with human pressures regarding coastal regions. In this way, able to counteract effects through high thermotolerance species, range shift processes meadows variations in community composition valuable marine ecosystem. Anyway, power acclimatizati...

Effects of trawling on Posidonia oceanica beds. Posid onia beds between Capo Circeo and Terracina (Mid-Tyrrhenian Sea) were studied as part of a study of the effects of illegal trawling inside th e three m ile limit. M ore than a hund red station s, placed along tran sects orthogonal to the shore, were considered. The results obtained show great damage to the Posid onia beds: red uction in mean...

This paper describes the PREI (Posidonia oceanica Rapid Easy Index), a method used to assess the ecological status of seawater along Mediterranean French coasts. The PREI was drawn up according to the requirements of the Water Framework Directive (WFD 2000/60/EC) and was tested on 24 and 18 stations in PACA (Provence-Alpes-Côtes d'Azur) and Corsica, respectively. The PREI is based on five metri...

Dried leaf fragments of the Mediterranean seagrass Posidonia oceanica were used as tracer particles to test if seagrass leaf canopies reduce particle resuspension. Half Petri dishes containing a known mass of tracer particles were deployed for 24 h, five times during the summer period inside a 15-m deep P. oceanica meadow and on an adjacent sandy bottom devoid of vegetation. The loss of tracer ...

Genome size (C-value) was measured in four species of Adriatic seagrasses with interphase-peak DNA image cytometry. The estimated 2C-value was 1.5 pg DNA for Zostera noltii (2n = 12), 1.2 pg for Zostera marina (2n = 12), 1.1 pg for Cymodocea nodosa (2n = 28) and 6.2 pg for Posidonia oceanica, using Pisum sativum (2C-value = 8.84 pg) as the calibration standard. Seagrass leaves were fixed in 4% ...