Occurrence of Vibrio parahaemolyticus in selected marine invertebrates, sediment, and seawater around Alexandria, Egypt

1982 ◽  
Vol 28 (11) ◽  
pp. 1261-1264 ◽  
Author(s):  
M. A. El-Sahn ◽  
A. A. El-Banna ◽  
A. M. El-Tabey Shehata
Keyword(s):  
Mediterranean Sea ◽  
Vibrio Parahaemolyticus ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Donax Trunculus ◽  
The Mediterranean

Samples of seawater, sediment, and the following invertebrates were collected from the Mediterranean Sea in the neighborhood of Alexandria, Egypt: sea urchins (Echinus spp.), clams (Tapes spp.), and wedge shells (Donax trunculus). A total of 165 samples were collected from November 1979 to July 1980. Average counts (per 100 mL or 100 g) of Vibrio parahaemolyticus content were as follows: seawater, 36; sea urchins, 349; sediment, 436; wedge shells, 534; clams, 1872. Samples collected in the summer months contained higher levels of V. parahaemolyticus than winter samples.

scholarly journals First Record and Massive Spread of Tropical Long-Spined Sea Urchin Diadema antillarum in the Mediterranean Sea (Syrian Coast)

2021 ◽  
pp. 1-4
Author(s):  
Izdihar Ali Ammar ◽  
Keyword(s):  
Mediterranean Sea ◽  
Sea Urchin ◽  
Sea Urchins ◽  
First Record ◽  
The Black Sea ◽  
Steady Increase ◽  
Diadema Antillarum ◽  
Important Species ◽  
The Mediterranean ◽  
Syrian Coast

The biological structure of the Syrian marine environment still shows a rapid and steady increase in the number of warm water species, many of which have become dominant and invasive. In the latest field data during 2020-2021, the presence of the black sea urchin Diadema antillarum (Philippi, 1845) was recorded for the first time in several locations in Latakia and Ras al-Bassit coast, and its massive spread at depths of 5-8 m, accompanied by invasive species of macroalgae, sponges, crustaceans and mollusks.. It is noteworthy that this species is one of the most widespread and important species of sea urchins in some tropical areas, and this is the first record in the Mediterranean Sea and the Syrian coast It is important as it prey on macroalgae and has an effective role in the health of some of the most important areas of biodiversity in the world.

Impact of sewage pollution on two species of sea urchins in the Mediterranean Sea (Cortiou, France): Radial asymmetry as a bioindicator of stress

2015 ◽  
Vol 54 ◽  
pp. 39-47 ◽  
Author(s):  
Yoland Savriama ◽  
Leif Christian Stige ◽  
Sylvain Gerber ◽  
Thierry Pérez ◽  
Paul Alibert ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Sea Urchins ◽  
Sewage Pollution ◽  
The Mediterranean ◽  
Radial Asymmetry

scholarly journals The rise of thermophilic sea urchins and the expansion of barren grounds in the Mediterranean Sea

2011 ◽  
Vol 27 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Paola Gianguzza ◽  
Davide Agnetta ◽  
Chiara Bonaviri ◽  
Francesco Di Trapani ◽  
Giulia Visconti ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Sea Urchins ◽  
The Mediterranean ◽  
Barren Grounds

scholarly journals Jellyfish Bioprospecting in the Mediterranean Sea: Antioxidant and Lysozyme-Like Activities from Aurelia coerulea (Cnidaria, Scyphozoa) Extracts

Marine Drugs ◽  
2021 ◽  
Vol 19 (11) ◽  
pp. 619
Author(s):  
Loredana Stabili ◽  
Lucia Rizzo ◽  
Rosa Caprioli ◽  
Antonella Leone ◽  
Stefano Piraino
Keyword(s):  
Mediterranean Sea ◽  
Bioactive Compounds ◽  
Coastal Waters ◽  
Marine Invertebrates ◽  
Coastal Lagoons ◽  
Complex Mixture ◽  
High Abundance ◽  
Moon Jellyfish ◽  
Aurelia Coerulea ◽  
The Mediterranean

Marine invertebrates represent a vast, untapped source of bioactive compounds. Cnidarians are represented by nearly 10,000 species that contain a complex mixture of venoms, collagen, and other bioactive compounds, including enzymes, oligosaccharides, fatty acids, and lipophilic molecules. Due to their high abundance in coastal waters, several jellyfish taxa may be regarded as candidate targets for the discovery of novel lead molecules and biomaterials and as a potential source of food/feed ingredients. The moon jellyfish Aurelia coerulea is one of the most common jellyfish worldwide and is particularly abundant in sheltered coastal lagoons and marinas of the Mediterranean Sea, where it first appeared—as an alien species—in the last century, when Pacific oyster cultivation began. In the present study, the antioxidant and lysozyme antibacterial activities associated with extracts from different medusa compartments—namely the umbrella, oral arms, and secreted mucus—were investigated. Extracts from the oral arms of A. coerulea displayed significant antioxidant activity. Similarly, lysozyme-like activity was the highest in extracts from oral arms. These findings suggest that A. coerulea outbreaks may be used in the search for novel cytolytic and cytotoxic products against marine bacteria. The geographically wide occurrence and the seasonally high abundance of A. coerulea populations in coastal waters envisage and stimulate the search for biotechnological applications of jellyfish biomasses in the pharmaceutical, nutritional, and nutraceutical sectors.

scholarly journals Chemical Composition and Microstructural Morphology of Spines and Tests of Three Common Sea Urchins Species of the Sublittoral Zone of the Mediterranean Sea

Animals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1351
Author(s):  
Anastasios Varkoulis ◽  
Konstantinos Voulgaris ◽  
Stefanos Zaoutsos ◽  
Antonios Stratakis ◽  
Dimitrios Vafidis
Keyword(s):  
Chemical Composition ◽  
Mediterranean Sea ◽  
Sea Urchins ◽  
Abiotic Factors ◽  
Molar Ratio ◽  
X Ray ◽  
Temporal Differences ◽  
Sublittoral Zone ◽  
Microstructural Morphology ◽  
The Mediterranean

In the Mediterranean Sea, the species Arbacia lixula, Paracentrotus lividus and Sphaerechinus granularis often coexist, occupying different subareas of the same habitat. The mechanical and chemical properties of their calcitic skeletons are affected both by their microstructural morphology and chemical composition. The present study describes the main morphologic features and the possible temporal differences in elemental composition of the test and spines of the three species, while also determining the molar ratio of each element of their crystalline phase. Scanning electron microscopy showed major differences in the ultrastructure of the spines, while minor differences in the test were also noticed. More specifically, the spines of all three sea urchins possess wedges, however A. lixula exhibits bridges connecting each wedge, while barbs are observed in the wedges of S. granularis. The spines of P. lividus are devoid of both microstructures. Secondary tubercles are absent in the test of A. lixula, while the tests and spines of all three species are characterized by different superficial stereom. Energy dispersive x-ray spectroscopy detected that Ca, Mg, S, Na and Cl were present in all specimen. Mg and Mg/Ca showed significant differences between species both in test and spines with S. granularis having the highest concentration. The spines of P. lividus exhibited lowest values between all species. Differences between spines and test were observed in all elements for P. lividus except S. A. lixula exhibited different concentrations between test and spines for Ca, Mg and Mg/Ca, whereas S. granularis for Mg, Cl and Mg/Ca. Finally, temporal differences for Ca were observed in the test of P. lividus and the spines of S. granularis, for Mg in test of S. granularis, for S in the spines of A. lixula and the test and spine of S. granularis, for Na in the test of P. lividus and A. lixula and for Cl and Mg/Ca in the test P. lividus. Powder X-ray diffractometry determined that, out of all three species, the spines of P. lividus contained the least Mg, while the test of the same species exhibited higher Mg concentration compared to A. lixula and S. granularis. The current study, although not labeling the specimens attempts to estimate potential time-related elemental differences among other results. These may occur due to changes in abiotic factors, probably water temperature, salinity and/or pH. Divergence in food preference and food availability may also play a key role in possible temporal differences the skeletons of these species

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Aeromonas dhakensis pneumonia and sepsis in a neonate Risso’s dolphin Grampus griseus from the Mediterranean Sea

2015 ◽  
Vol 116 (1) ◽  
pp. 69-74 ◽  
Author(s):  
L Pérez ◽  
ML Abarca ◽  
F Latif-Eugenín ◽  
R Beaz-Hidalgo ◽  
MJ Figueras ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Grampus Griseus ◽  
The Mediterranean ◽  
Risso's Dolphin

Dolphin Morbillivirus in the Mediterranean Sea

2008 ◽  
Vol 34 (4) ◽  
pp. 514-515 ◽  
Author(s):  
Giovanni Di Guardo
Keyword(s):  
Mediterranean Sea ◽  
Dolphin Morbillivirus ◽  
The Mediterranean
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