scholarly journals Distribution characteristics of pandalid shrimps (Decapoda: Caridea: Pandalidae) along the Central Mediterranean Sea

2004 ◽  
Vol 5 (2) ◽  
pp. 35 ◽  
Author(s):  
E. FANELLI ◽  
F. COLLOCA ◽  
A. BELLUSCIO ◽  
G.D. ARDIZZONE
Keyword(s):  
Spatial Distribution ◽  
Mediterranean Sea ◽  
Shelf Break ◽  
Distribution Characteristics ◽  
Central Mediterranean ◽  
Bathymetric Distribution ◽  
Spatial Differences ◽  
Study Population ◽  
Trawl Surveys ◽  
Upper Slope

The genus Plesionika is represented in the Mediterranean Sea by eight species, six of which,Plesionikaacanthonotus, P. antigai, P. edwardsii, P. gigliolii, P. heterocarpus and P. martia, are very common on muddy bottoms of the continental slope. During nine experimental trawl surveys a total of 29,038 individuals of these six pandalid species, was collected off the central western coasts of Italy (central Mediterranean) in order to study population structure and spatial distribution. P . antigaiinhabits the shelf break and upper slope; P. heterocarpus shows a wide bathymetric distribution, from the shelf-break to the upper slope; P. edwardsii and P. gigliolii occur in the upper slope. P. acanthonotus and P. martia occur in the deepest depths investigated. Segregation by size is revealed for the species that inhabit the same bottoms. The non-homogenous spatial distribution of Plesionikaspecies in the study area was probably related to the spatial differences in the magnitude of primary production in the area.

Cetacean occurrence and spatial distribution in the central Mediterranean Sea using ferries as platform of observation

2015 ◽  
Vol 41 (5) ◽  
pp. 343-350 ◽  
Author(s):  
M. Aïssi ◽  
A. Arcangeli ◽  
R. Crosti ◽  
M. N. Daly Yahia ◽  
B. Loussaief ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Mediterranean Sea ◽  
Central Mediterranean ◽  
Central Mediterranean Sea

A brachiopod biotope associated with rocky bottoms at the shelf break in the central Mediterranean Sea: Geobiological traits and conservation aspects

2020 ◽  
Vol 30 (2) ◽  
pp. 402-411
Author(s):  
Lorenzo Angeletti ◽  
Simonepietro Canese ◽  
Frine Cardone ◽  
Giorgio Castellan ◽  
Federica Foglini ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Shelf Break ◽  
Central Mediterranean ◽  
Central Mediterranean Sea ◽  
Rocky Bottoms

scholarly journals An additional record of the non-indigenous species (NIS) Seriola fasciata from the southern coast of Sicily (Central Mediterranean Sea)

2020 ◽  
Vol 61 (2) ◽  
pp. 223-230
Author(s):  
Michele Luca Geraci ◽  
Fabio Falsone ◽  
Danilo Scannella ◽  
Sergio Vitale
Keyword(s):  
Spatial Distribution ◽  
Mediterranean Sea ◽  
Indigenous Species ◽  
Southern Coast ◽  
Central Mediterranean ◽  
Seriola Dumerili ◽  
Central Mediterranean Sea ◽  
Greater Amberjack ◽  
Non Indigenous Species

An additional record of the non-indigenous species (NIS) Seriola fasciata from the southern coast of Sicily (Central Mediterranean Sea) is here described in this note. The catch record is the first in the area and confirms the key role of the area for NIS spreading. In addition, an updated map of its spatial distribution is provided as well as a discussion on the possible misidentification and competition with the native greater amberjack Seriola dumerili.

scholarly journals Batoid Abundances, Spatial Distribution, and Life History Traits in the Strait of Sicily (Central Mediterranean Sea): Bridging a Knowledge Gap through Three Decades of Survey

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2189
Author(s):  
Michele Luca Geraci ◽  
Sergio Ragonese ◽  
Danilo Scannella ◽  
Fabio Falsone ◽  
Vita Gancitano ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Life History ◽  
Life History Traits ◽  
Current Status ◽  
Distribution Analysis ◽  
Central Mediterranean ◽  
Strait Of Sicily ◽  
Abundance Trends ◽  
First Maturity ◽  
Trawl Surveys

Batoid species play a key role in marine ecosystems but unfortunately they have globally declined over the last decades. Given the paucity of information, abundance data and the main life history traits for batoids, obtained through about three decades of bottom trawl surveys, are presented and discussed. The surveys were carried out in two areas of the Central Mediterranean (South of Sicily and Malta Island), in a timeframe ranging from 1990 to 2018. Excluding some batoids, the abundance trends were stable or increasing. Only R. clavata, R. miraletus, and D. oxyrinchus showed occurrence and abundance indexes notable enough to carry out more detailed analysis. In particular, spatial distribution analysis of these species highlighted the presence of two main hotspots in Sicilian waters whereas they seem more widespread in Malta. The lengths at first maturity (L50) were 695 and 860, 635 and 574, and 364 and 349 mm total length (TL), respectively, for females and males of D. oxyrinchus, R. clavata, and R. miraletus. The asymptotic lengths (L∞) and the curvature coefficients (K) were 1365 and 1240 (K = 0.11 and 0.26), 1260 and 1100 (K = 0.16 and 0.26), and 840 and 800 mm TL (K = 0.36 and 0.41), respectively, for females and males of D. oxyrinchus, R. clavata, and R. miraletus. The lack of detailed quantitative historical information on batoids of Sicily and Malta does not allow to analytically judge the current status of the stocks, although the higher abundance of some species within Malta raises some concern for the Sicilian counterpart. In conclusion, suitable actions to protect batoids in the investigated area are recommended.

scholarly journals Long-term spatiotemporal dynamics of cephalopod assemblages in the Mediterranean Sea

2020 ◽  
Vol 83 (S1) ◽  
pp. 33
Author(s):  
Antoni Quetglas ◽  
Maria Valls ◽  
Francesca Capezzuto ◽  
Loredana Casciaro ◽  
Danila Cuccu ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Biodiversity Loss ◽  
Longitudinal Gradient ◽  
Eastern Basin ◽  
Mediterranean Countries ◽  
Spatial Differences ◽  
The Mediterranean ◽  
Increasing Temperature ◽  
Trawl Surveys

The Mediterranean Sea shows a trend of increasing temperature and decreasing productivity from the western to the eastern basin. In this work we investigate whether this trend is reflected in the cephalopod assemblages found throughout the Mediterranean. Data obtained with bottom trawl surveys carried out during the last 22 years by EU Mediterranean countries were used. In addition to analysing spatial differences in cephalopod assemblages, we also analysed putative temporal changes during the last two decades. For this purpose, the basin was spatially divided into bioregions, the trawling grounds were subdivided into depth strata, and the dataset was split into two time series of 11 years each. All analyses were done using PRIMER software. The species richness did not vary with the longitudinal gradient, though in most bioregions it showed a mild decrease with depth before plummeting in the deepest waters. Cluster analysis revealed four different bathymetric assemblages in all bioregions. Despite the contrasting conditions between basins and the claims of biodiversity loss, our study revealed that spatial and temporal differences during the last two decades were restricted to changes in the relative abundance of species from a common pool of species inhabiting the whole Mediterranean.

scholarly journals Distribution and biology of the Blackmouth catshark Galeus melastomus in the Strait of Sicily (Central Mediterranean Sea)

2009 ◽  
Vol 10 (1) ◽  
pp. 55 ◽  
Author(s):  
S. RAGONESE ◽  
G. NARDONE ◽  
D. OTTONELLO ◽  
S. GANCITANO ◽  
G.B. GIUSTO ◽  
...  
Keyword(s):  
Sexual Maturity ◽  
Bottom Trawl ◽  
Biological Traits ◽  
Central Mediterranean ◽  
Strait Of Sicily ◽  
By Catch ◽  
Trawl Fisheries ◽  
Individual Size ◽  
Trawl Surveys ◽  
Upper Slope

The Blackmouth catshark, Galeus melastomus, Rafinesque, 1810 (Carcharhiniformes; Scyliorhinidae), is a common, although at present discarded, by- catch of the bottom trawl fisheries in the Strait of Sicily. Given its ecological interest, data gathered in experimental bottom trawl surveys were analysed in order to describe its distribution and main biological traits. The Blackmouth catshark was sampled almost exclusively on the upper slope (200-800), showing the highest frequency of occurrence (69-100%), biomass (BI; 10-85 kg*km-2) and density (DI; 54-506 N*km-2) indexes in the deeper (501-800m) grounds. Individual size (total length, TL, mm) were between 70-590 and 90-510 in females and males, respectively. The sex ratio (SR) was around 0.5. The SR by size showed a gradual decrease till 450 mm class size, followed by an increase up 1 after 500 mm. Virginal/immature specimens represented the bulk of the samples in both females (77%) and males (65%); the length at 50% of sexual maturity (Lm50%) and corresponding maturity range (Lm25% - Lm75% ) was 433 (423-443) and 380 (366-394) mm, respectively.

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