scholarly journals Is Posidonia oceanica regression a general feature in the Mediterranean Sea?

2013 ◽  
Vol 14 (1) ◽  
pp. 193 ◽  
Author(s):  
M. BONACORSI ◽  
C. PERGENT-MARTINI ◽  
N. BREAND ◽  
G. PERGENT
Keyword(s):  
Mediterranean Sea ◽  
Temporal Evolution ◽  
Posidonia Oceanica ◽  
Aerial Photographs ◽  
Human Pressure ◽  
The Mediterranean ◽  
Spatio Temporal ◽  
Mapping Techniques ◽  
Significant Regression ◽  
Ancient Maps

Over the last few years, a widespread regression of Posidonia oceanica meadows has been noticed in the Mediterranean Sea. However, the magnitude of this decline is still debated. The objectives of this study are (i) to assess the spatio-temporal evolution of Posidonia oceanica around Cap Corse (Corsica) over time comparing available ancient maps (from 1960) with a new (2011) detailed map realized combining different techniques (aerial photographs, SSS, ROV, scuba diving); (ii) evaluate the reliability of ancient maps; (iii) discuss observed regression of the meadows in relation to human pressure along the 110 km of coast. Thus, the comparison with previous data shows that, apart from sites clearly identified with the actual evolution, there is a relative stability of the surfaces occupied by the seagrass Posidonia oceanica. The recorded differences seem more related to changes in mapping techniques. These results confirm that in areas characterized by a moderate anthropogenic impact, the Posidonia oceanica meadow has no significant regression and that the changes due to the evolution of mapping techniques are not negligible. However, others facts should be taken into account before extrapolating to the Mediterranean Sea (e.g. actually mapped surfaces) and assessing the amplitude of the actual regression.

scholarly journals The spatio-temporal distribution of lightning over Israel and the neighboring area and its relation to regional synoptic systems

2011 ◽  
Vol 11 (8) ◽  
pp. 2125-2135 ◽  
Author(s):  
S. Shalev ◽  
H. Saaroni ◽  
T. Izsak ◽  
Y. Yair ◽  
B. Ziv
Keyword(s):  
Spatial Distribution ◽  
Mediterranean Sea ◽  
Temporal Distribution ◽  
Lightning Activity ◽  
Eastern Coast ◽  
Synoptic Situation ◽  
Lightning Flash ◽  
The Mediterranean ◽  
Spatio Temporal ◽  
Neighboring Area

Abstract. The spatio-temporal distribution of lightning flashes over Israel and the neighboring area and its relation to the regional synoptic systems has been studied, based on data obtained from the Israel Lightning Location System (ILLS) operated by the Israel Electric Corporation (IEC). The system detects cloud-to-ground lightning discharges in a range of ~500 km around central Israel (32.5° N, 35° E). The study period was defined for annual activity from August through July, for 5 seasons in the period 2004–2010. The spatial distribution of lightning flash density indicates the highest concentration over the Mediterranean Sea, attributed to the contribution of moisture as well as sensible and latent heat fluxes from the sea surface. Other centers of high density appear along the coastal plain, orographic barriers, especially in northern Israel, and downwind from the metropolitan area of Tel Aviv, Israel. The intra-annual distribution shows an absence of lightning during the summer months (JJA) due to the persistent subsidence over the region. The vast majority of lightning activity occurs during 7 months, October to April. Although over 65 % of the rainfall in Israel is obtained during the winter months (DJF), only 35 % of lightning flashes occur in these months. October is the richest month, with 40 % of total annual flashes. This is attributed both to tropical intrusions, i.e., Red Sea Troughs (RST), which are characterized by intense static instability and convection, and to Cyprus Lows (CLs) arriving from the west. Based on daily study of the spatial distribution of lightning, three patterns have been defined; "land", "maritime" and "hybrid". CLs cause high flash density over the Mediterranean Sea, whereas some of the RST days are typified by flashes over land. The pattern defined "hybrid" is a combination of the other 2 patterns. On CL days, only the maritime pattern was noted, whereas in RST days all 3 patterns were found, including the maritime pattern. It is suggested that atmospheric processes associated with RST produce the land pattern. Hence, the occurrence of a maritime pattern in days identified as RST reflects an "apparent RST". The hybrid pattern was associated with an RST located east of Israel. This synoptic type produced the typical flash maximum over the land, but the upper-level trough together with the onshore winds it induced over the eastern coast of the Mediterranean resulted in lightning activity over the sea as well, similar to that of CLs. It is suggested that the spatial distribution patterns of lightning may better identify the synoptic system responsible, a CL, an "active RST" or an "apparent RST". The electrical activity thus serves as a "fingerprint" for the synoptic situation responsible for its generation.

scholarly journals Ophelia roscoffensis Augener, 1910: a new polychaete record in Italian waters

Check List ◽  
2019 ◽  
Vol 15 (3) ◽  
pp. 489-495
Author(s):  
Emanuele Mancini ◽  
Francesco Tiralongo ◽  
Daniele Ventura ◽  
Andrea Bonifazi
Keyword(s):  
Mediterranean Sea ◽  
First Record ◽  
Posidonia Oceanica ◽  
Tyrrhenian Sea ◽  
The Mediterranean

Ophelia roscoffensis Augener, 1910 is an opheliid worm identifiable by the number of anterior abranchiate chaetigers and the number of the gill pairs. Although it was already reported in the Mediterranean Sea, it has never been found in the Italian waters. This study represents the first record of Ophelia roscoffensis in the Italian waters. A total of 18 specimens were collected along the coast of Civitavecchia (Tyrrhenian Sea) in a Posidonia oceanica (L.) Delile bed at a depth of 7 m.

scholarly journals Goniadella bobrezkii (Annenkova, 1929) (Annelida, Polychaeta): first record in the Italian waters

Check List ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 125-130
Author(s):  
Emanuele Mancini ◽  
Francesco Tiralongo ◽  
Daniele Ventura ◽  
Andrea Bonifazi
Keyword(s):  
Mediterranean Sea ◽  
First Record ◽  
Posidonia Oceanica ◽  
Posterior Spine ◽  
The Mediterranean ◽  
Italian Coasts

Goniadella bobrezkii (Annenkova, 1929) is a small goniadid worm identifiable by the number of anterior uniramous parapodia and by the position of the posterior spine-like notochetae arising dorsal to dorsal cirri. Although it was already reported in the Mediterranean Sea, it has never been found in the Italian waters. This study represents the first generic and specific record of G. bobrezkii along Italian coasts. A total of 25 specimens were collected in a Posidonia oceanica (L.) Delile bed, depth of 7 m, off Civitavecchia (Rome).

scholarly journals Large-scale spatio-temporal monitoring highlights hotspots of demersal fish diversity in the Mediterranean Sea

2015 ◽  
Vol 130 ◽  
pp. 65-74 ◽  
Author(s):  
Victoria Granger ◽  
Jean-Marc Fromentin ◽  
Nicolas Bez ◽  
Giulio Relini ◽  
Christine N. Meynard ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Large Scale ◽  
Demersal Fish ◽  
Fish Diversity ◽  
The Mediterranean ◽  
Spatio Temporal

scholarly journals Contribution of Posidonia oceanica meadows in the context of climate change mitigation in the Mediterranean Sea

2021 ◽  
Vol 165 ◽  
pp. 105236
Author(s):  
Christine Pergent-Martini ◽  
Gérard Pergent ◽  
Briac Monnier ◽  
Charles-François Boudouresque ◽  
Christophe Mori ◽  
...  
Keyword(s):  
Climate Change ◽  
Mediterranean Sea ◽  
Climate Change Mitigation ◽  
Posidonia Oceanica ◽  
The Mediterranean ◽  
Change Mitigation
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