Genetic characterisation of the spiny dogfish Squalus acanthias in the Adriatic Sea: evidence for high genetic diversity and an Atlantic–South Pacific origin

2021 ◽  
Vol 72 (1) ◽  
pp. 131
Author(s):  
Romana Gracan ◽  
Bojan Lazar ◽  
Sara Zupan ◽  
Elena Bužan
Keyword(s):  
Genetic Diversity ◽  
Mediterranean Sea ◽  
Adriatic Sea ◽  
South Pacific ◽  
Squalus Acanthias ◽  
Spiny Dogfish ◽  
Mt Dna ◽  
High Genetic Diversity ◽  
Nadh Dehydrogenase Subunit 2 ◽  
The Mediterranean

Spiny dogfish Squalus acanthias is a widely distributed, highly migratory mesopredatory shark that is extremely sensitive to overexploitation. Because of unregulated targeted and incidental capture and a lack of enforceable management in the Mediterranean Sea, the spiny dogfish subpopulation has declined by at least 50% in the Mediterranean Sea over the past 75–105 years, and is regionally classified as endangered. In this study we sampled 124 spiny dogfish in the northern-most part of the Mediterranean (i.e. the Adriatic Sea) to: (1) assess levels of genetic diversity using 13 microsatellite loci and mitochondrial (mt)DNA (NADH dehydrogenase subunit 2 (ND2) gene); and (2) infer its evolutionary placement while assessing further possible genetic divergence across the Atlantic and Pacific Ocean basins based on ND2. Analysis of mtDNA revealed 12 unique haplotypes and a high level of genetic variation in the Mediterranean region, whereas results from microsatellite markers showed significant genetic heterogeneity and a fine-scale stock structuring involving both sexes. The findings support an Atlantic–South Pacific origin for the spiny dogfish in the Adriatic Sea, with little or no present-day connectivity with the Atlantic population. Consequently, this commercially exploited and regionally endangered coastal shark in the Adriatic Sea should be considered as a separate management unit, with implementation of regional protective management plans.

scholarly journals High Genetic Diversity Detected in Olives beyond the Boundaries of the Mediterranean Sea

PLoS ONE ◽  
2014 ◽  
Vol 9 (4) ◽  
pp. e93146 ◽  
Author(s):  
Mehdi Hosseini-Mazinani ◽  
Roberto Mariotti ◽  
Bahareh Torkzaban ◽  
Massoma Sheikh-Hassani ◽  
Saeedeh Ataei ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mediterranean Sea ◽  
High Genetic Diversity ◽  
The Mediterranean

scholarly journals Observations on the Feeding of Drymonema dalmatinum in the Gulf of Trieste

Diversity ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 163
Author(s):  
Saul Ciriaco ◽  
Lisa Faresi ◽  
Marco Segarich
Keyword(s):  
Mediterranean Sea ◽  
Adriatic Sea ◽  
Gulf Of Trieste ◽  
The Mediterranean ◽  
Scyphozoan Jellyfish

The largest scyphozoan jellyfish of the Mediterranean Sea, Drymonema dalmatinum was first described by Haeckel [1] from material collected off the Dalmatian coast of the Adriatic Sea [...]

scholarly journals First record of the Combtooth Blenny, Microlipophrys adriaticus (Steindachner & Kolombatovic, 1883) (Pisces, Blenniidae), for the Italian Ionian Sea

Check List ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 1646 ◽  
Author(s):  
F. Tiralongo ◽  
R. Baldacconi
Keyword(s):  
Mediterranean Sea ◽  
Black Sea ◽  
Adriatic Sea ◽  
First Record ◽  
The Black Sea ◽  
Ionian Sea ◽  
Sea Of Marmara ◽  
Limited Distribution ◽  
The North ◽  
The Mediterranean

Microlipophrys adriaticus (Steindachner & Kolombatovic, 1883) is an endemic blenny of the Mediterranean Sea. It is also known from the Sea of Marmara and the Black Sea. However, unlike other species of combtooth blennies, M. adriaticus is a fish with a limited distribution in Adriatic Sea, especially in the north, where it can be common. We report here the first record of this species from the waters of the Ionian Sea.

Carbonate System and Acidification of the Adriatic Sea

2020 ◽  
Author(s):  
Valentina Turk ◽  
Nina Bednarsek ◽  
Jadran Faganeli ◽  
Blaženka Gasparovic ◽  
Michele Giani ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Adriatic Sea ◽  
Microbial Community Composition ◽  
Aegean Sea ◽  
Total Alkalinity ◽  
The Black Sea ◽  
Po River ◽  
Saturation State ◽  
Northern Adriatic ◽  
The Mediterranean

<p>Although the marginal seas represent only 7% of the total ocean area, the CO<sub>2</sub> fluxes are intensive and important for the carbon budget, exposing to an intense process of anthropogenic ocean acidification (OA). A decline in pH, especially in the estuarine waters, results also from the eutrophication-induced acidification. The Adriatic Sea is currently a CO<sub>2 </sub>sink with an annual flux of approximately -1.2 to -3 mol C m<sup>-2</sup> yr<sup>-1</sup> which is twice as low compared to the net sink rates in the NW Mediterranean (-4 to -5 mol C m<sup>-2</sup> yr<sup>-1</sup>). Based on the comparison of two winter cruises carried out in in the 25-year interval between 1983 and 2008, acidification rate of 0.003 pH<sub>T</sub> units yr<sup>−1</sup> was estimated in the northern Adriatic which is similar to the Mediterranean open waters (with recent estimations of −0.0028 ± 0.0003 units pH<sub>T</sub> yr<sup>−1</sup>) and the surface coastal waters (-0.003 ± 0.001 and -0.0044 ± 0.00006 pH<sub>T</sub> units yr<sup>−1</sup>). The computed Revelle factor for the Adriatic Sea, with the value of about 10, indicates that the buffer capacity is rather high and that the waters should not be particularly exposed to acidification. Total alkalinity (TA) in the Adriatic (2.6-2.7 mM) is in the upper range of TA measured in the Mediterranean Sea because riverine inputs transport carbonates dissolved from the Alpine dolomites and karstic watersheds. The Adriatic Sea is the second sub-basin (319 Gmol yr<sup>-1</sup>), following the Aegean Sea (which receives the TA contribution from the Black Sea), that contribute to the riverine TA discharges into the Mediterranean Sea. About 60% of the TA inflow into the Adriatic Sea is attributed to the Po river discharge with TA of ~3 mM and TA decreases with increasing salinity. Saturation state indicates that the waters of the Adriatic are supersaturated with respect to calcite (Ω<sub>Ca</sub>) and aragonite (Ω<sub>Ar</sub>) throughout the year. However, saturation states are considerably lower in the bottom water layers, due to the prevalence of benthic remineralization processes in the stratification period. The seasonal changes of the chemical and environmental conditions and relatively small size of the Adriatic Sea area the microbial community composition, function (growth, enzymatic activity) and carbon and nitrogen biogeochemical cycles. Significant effects on calcifying organisms and phytoplankton are expected while the effects of possible OA on microbially-driven processes are not known yet.</p>

scholarly journals Hydrogen peroxide in deep waters from the Mediterranean Sea, South Atlantic and South Pacific Oceans

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Mark J. Hopwood ◽  
Insa Rapp ◽  
Christian Schlosser ◽  
Eric P. Achterberg
Keyword(s):  
Hydrogen Peroxide ◽  
Mediterranean Sea ◽  
South Pacific ◽  
South Atlantic ◽  
Deep Waters ◽  
The Mediterranean

First record of the marbled spinefoot Siganus rivulatus (Pisces: Siganidae) in the Adriatic Sea

2004 ◽  
Vol 84 (5) ◽  
pp. 1087-1088 ◽  
Author(s):  
J. Dulĉić ◽  
A. Pallaoro
Keyword(s):  
Mediterranean Sea ◽  
Adriatic Sea ◽  
First Record ◽  
Beach Seine ◽  
Total Length ◽  
The Mediterranean ◽  
Siganus Rivulatus ◽  
First Time

Lessepsian migrant Siganus rivulatus is reported for the first time from the Adriatic Sea, substantially further north than its usual area of occurrence in the Mediterranean Sea. Two specimens (111 mm total length [TL] and 149 mm TL) were captured by beach seine on 5 October 2002 off islet Bobara, near Cavtat (southern Adriatic). Morphometric and meristic characteristics of the specimens are provided. The possible explanations of this occurrence are discussed.

scholarly journals Changes in ventilation of the Mediterranean Sea during the past 25 year

Ocean Science ◽  
2014 ◽  
Vol 10 (1) ◽  
pp. 1-16 ◽  
Author(s):  
A. Schneider ◽  
T. Tanhua ◽  
W. Roether ◽  
R. Steinfeldt
Keyword(s):  
Mediterranean Sea ◽  
Deep Water ◽  
Adriatic Sea ◽  
Western Mediterranean ◽  
Tyrrhenian Sea ◽  
Deep Water Formation ◽  
Technical Problems ◽  
Water Formation ◽  
The Mediterranean ◽  
Transient Tracer

Abstract. Significant changes in the overturning circulation of the Mediterranean Sea has been observed during the last few decades, the most prominent phenomena being the Eastern Mediterranean Transient (EMT) in the early 1990s and the Western Mediterranean Transition (WMT) during the mid-2000s. During both of these events unusually large amounts of deep water were formed, and in the case of the EMT, the deep water formation area shifted from the Adriatic to the Aegean Sea. Here we synthesize a unique collection of transient tracer (CFC-12, SF6 and tritium) data from nine cruises conducted between 1987 and 2011 and use these data to determine temporal variability of Mediterranean ventilation. We also discuss biases and technical problems with transient tracer-based ages arising from their different input histories over time; particularly in the case of time-dependent ventilation. We observe a period of low ventilation in the deep eastern (Levantine) basin after it was ventilated by the EMT so that the age of the deep water is increasing with time. In the Ionian Sea, on the other hand, we see evidence of increased ventilation after year 2001, indicating the restarted deep water formation in the Adriatic Sea. This is also reflected in the increasing age of the Cretan Sea deep water and decreasing age of Adriatic Sea deep water since the end of the 1980s. In the western Mediterranean deep basin we see the massive input of recently ventilated waters during the WMT. This signal is not yet apparent in the Tyrrhenian Sea, where the ventilation seems to be fairly constant since the EMT. Also the western Alboran Sea does not show any temporal trends in ventilation.

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