scholarly journals Evidence of high genetic connectivity for the longnose spurdog Squalus blainville in the Mediterranean Sea

2015 ◽  
Vol 17 (2) ◽  
pp. 371 ◽  
Author(s):  
V. KOUSTENI ◽  
P. KASAPIDIS ◽  
G. KOTOULAS ◽  
P. MEGALOFONOU
Keyword(s):  
Mitochondrial Dna ◽  
Genetic Structure ◽  
Mediterranean Sea ◽  
Genetic Connectivity ◽  
Middle Pleistocene ◽  
Biological Knowledge ◽  
Shark Species ◽  
High Dispersal ◽  
Dispersal Potential ◽  
The Mediterranean

Squalus blainville is one of the least studied Mediterranean shark species. Despite being intensively fished in several locations, biological knowledge is limited and no genetic structure information is available. This is the first study to examine the genetic structure of S. blainville in the Mediterranean Sea. Considering the high dispersal potential inferred for other squalid sharks, the hypothesis of panmixia was tested based on a 585 bp fragment of the mitochondrial DNA cytochrome c oxidase subunit I gene from 107 individuals and six nuclear microsatellite loci from 577 individuals. Samples were collected across the Ionian, Aegean and Libyan Seas and off the Balearic Islands. Twenty three additional sequences of Mediterranean and South African origin were retrieved from GenBank and included in the mitochondrial DNA analysis. The overall haplotype diversity was high, in contrast to the low nucleotide diversity. Low and non-significant pairwise ΦST and FST values along with a Bayesian cluster analysis suggested high connectivity with subsequent genetic homogeneity among the populations studied, and thus a high dispersal potential for S. blainville similar to other squalids. The historical demography of the species was also assessed, revealing a pattern of population expansion since the middle Pleistocene. These findings could be considered in species-specific conservation plans, although sampling over a larger spatial scale and more genetic markers are required to fully elucidate the genetic structure and dispersal potential of S. blainville.

scholarly journals The role of the Strait of Gibraltar in shaping the genetic structure of the Mediterranean Grenadier, Coryphaenoides mediterraneus, between the Atlantic and Mediterranean Sea

PLoS ONE ◽  
2017 ◽  
Vol 12 (5) ◽  
pp. e0174988 ◽  
Author(s):  
Diana Catarino ◽  
Sergio Stefanni ◽  
Per Erik Jorde ◽  
Gui M. Menezes ◽  
Joan B. Company ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Mediterranean Sea ◽  
Strait Of Gibraltar ◽  
The Mediterranean

scholarly journals Combined analysis of four mitochondrial regions allowed the detection of several matrilineal lineages of the lessepsian fish Fistularia commersonii in the Mediterranean Sea

2010 ◽  
Vol 91 (6) ◽  
pp. 1289-1293 ◽  
Author(s):  
Daria Sanna ◽  
Paolo Merella ◽  
Tiziana Lai ◽  
Sarra Farjallah ◽  
Paolo Francalacci ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Genetic Variability ◽  
Mediterranean Sea ◽  
Mediterranean Basin ◽  
Accurate Estimate ◽  
Cyt B ◽  
D Loop ◽  
The Mediterranean ◽  
Pacific Species ◽  
The Mediterranean Basin

The bluespotted cornetfish (Fistularia commersonii) is an Indo-Pacific species that in the last ten years colonized a large part of the Mediterranean basin. The aim of this study was to sequence some portions of the mitochondrial DNA (D-loop II, 16S, 12S and Cyt b) of this fish from different localities of the Mediterranean Sea, in order to evaluate the level of its genetic variability in this area. The genetic analysis performed on specimens from seven localities of Sardinia, Tunisia and Libya revealed the presence of at least five mitochondrial lineages. The results obtained, compared with previous studies, indicate that the use of a sufficient number of mitochondrial regions may allow a more accurate estimate of genetic variability in lessepsian invasions.

scholarly journals Genetic Structure of Bluefin Tuna in the Mediterranean Sea Correlates with Environmental Variables

PLoS ONE ◽  
2013 ◽  
Vol 8 (11) ◽  
pp. e80105 ◽  
Author(s):  
Giulia Riccioni ◽  
Marco Stagioni ◽  
Monica Landi ◽  
Giorgia Ferrara ◽  
Guido Barbujani ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Mediterranean Sea ◽  
Environmental Variables ◽  
Bluefin Tuna ◽  
The Mediterranean

scholarly journals First genetically confirmed records of the little gulper shark Centrophorus uyato (Squaliformes: Centrophoridae) from Cypriot waters

2021 ◽  
Vol 9 ◽  
Author(s):  
Vasiliki Kousteni ◽  
Marios Papageorgiou ◽  
Michail Rovatsos ◽  
Ioannis Thasitis ◽  
Louis Hadjioannou
Keyword(s):  
Mitochondrial Dna ◽  
Mediterranean Sea ◽  
Geographical Distribution ◽  
Ribosomal Rna ◽  
Nucleotide Sequences ◽  
16S Ribosomal Rna ◽  
Phylogenetic Placement ◽  
Oxidase Subunit ◽  
The Mediterranean

The taxonomy within the genus Centrophorus has been controversial almost since its origin, raising uncertainties about the identification, the phylogenetic placement and the geographical distribution of several species. The partial nucleotide sequences of two mitochondrial DNA gene regions, the cytochrome c oxidase subunit I and the 16S ribosomal RNA, genetically confirmed the presence of the little gulper shark in Cypriot waters. The species presence in the Mediterranean Sea is revised and discussed.

scholarly journals Phenological and molecular studies on the introduced seaweed Dictyota cyanoloma (Dictyotales, Phaeophyceae) along the Mediterranean coast of the Iberian Peninsula

2016 ◽  
Vol 17 (3) ◽  
pp. 766 ◽  
Author(s):  
J. ARAGAY ◽  
D. VITALES ◽  
A. GÓMEZ GARRETA ◽  
M. A. RIBERA SIGUAN ◽  
F. STEEN ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Mediterranean Sea ◽  
Algal Species ◽  
Haplotype Diversity ◽  
Morphological Plasticity ◽  
Mediterranean Coast ◽  
Long Distance ◽  
Multiple Introductions ◽  
Mitochondrial Haplotypes ◽  
The Mediterranean

Dictyota cyanoloma, a distinctive brown algal species characterized by a blue-iridescent margin, was recently reported as an introduced species in the Mediterranean Sea (Steen et al., 2016) but little is known about its distribution dynamics, morphological plasticity and genetic structure. In the present integrative study, we evaluate its past and present occurrence along the Mediterranean Iberian coast, assess the species’ phenology in Palamós (Girona, Spain) and analyze the haplotype diversity by sequencing 49 individuals from nine sampling sites for different chloroplast and mitochondrial DNA regions. Although D. cyanoloma currently occurs along the Mediterranean Iberian coast (in 19 of 36 localities sampled between Algeciras and Llançà, mostly in marinas and harbour environments), we were not able to find any herbarium material of this species (at BCN-Phyc and MA) predating the year 1987. In Palamós, D. cyanoloma is present all through the year, with a maximum development in winter and a minimum in summer. Fertile specimens are absent during summer (July and August). Sporophytes are dominant from January to June and dioecious gametophytes were found only in February, March and June. Information about the antheridia, which has never been described before, is provided. Two chloroplast and three mitochondrial haplotypes were observed, indicating that multiple introductions of D. cyanoloma occurred in the study area. Additionally, the genetic structure suggests that spread did not occur through simple advancing wave fronts but by several long-distance dispersal events. Further studies employing microsatellite markers could potentially offer a better resolution to unravel expansion and colonisation dynamics of D. cyanoloma in the Mediterranean Sea.

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