Early Pleistocene divergence of Pelagia noctiluca populations (Cnidaria, Medusozoa) between the Atlantic Ocean and the Mediterranean Sea

2019 ◽  
Vol 99 (8) ◽  
pp. 1753-1764
Author(s):  
Ezequiel Ale ◽  
Andreja Ramšak ◽  
David Stanković ◽  
André Carrara Morandini ◽  
Diogo Meyer ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Ribosomal Rna ◽  
Sequence Data ◽  
Early Pleistocene ◽  
Messinian Salinity Crisis ◽  
Mediterranean Populations ◽  
The North ◽  
Pelagia Noctiluca ◽  
The Mediterranean

AbstractA previous study detected mixing of two deeply split mtDNA clades (Clade I and Clade II) for Atlantic and Mediterranean populations of the medusozoan Pelagia noctiluca. The north hemisphere glaciations and the Messinian salinity crisis have been proposed as the two main biogeographic events related to the isolation between the Atlantic Ocean and the Mediterranean Sea. We tested if the splitting time between Clade I and Clade II of P. noctiluca was associated with one of these geological events. Our study was based on DNA sequence data of mitochondrial (COI and 16S ribosomal RNA) and nuclear (18S ribosomal RNA, internal transcribed spacer 1 and 5.8S ribosomal RNA) genes from populations of the Atlantic and Pacific Ocean and the Mediterranean Sea. The rise of the Isthmus of Panama was used to calibrate substitution rates for COI. This calibration was based on the detection of a shallow but significant genetic structure between P. noctiluca populations from the Pacific and the Atlantic Oceans. Considering our calibration for COI, we refute a possible origin of Clades I and II during the Messinian salinity crisis. Our estimates suggest the origin for a putative common ancestor of Clades I and II around 2.57 Ma (with 95% 2.91–2.22 HPD), roughly corresponding to the Gelasian stage of the early Pleistocene. These alterations include changes in the sea level and oceanic currents at the Strait of Gibraltar and other regions of the Mediterranean basin, and could explain the origin of the two P. noctiluca clades.

scholarly journals Messinian ostracodes from the western Betic Strait (SW Spain)

2021 ◽  
Vol 21 (8) ◽  
pp. 181-192
Author(s):  
Romero Verónica ◽  
Francisco Ruiz ◽  
María Luz González-Regalado ◽  
Josep Tosquella ◽  
Manuel Abad ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Water Depth ◽  
Abundant Species ◽  
Messinian Salinity Crisis ◽  
The Holocene ◽  
Sw Spain ◽  
The Mediterranean ◽  
Short Transition

During the Neogene, the Betic Strait was one of the gateways that connected the Atlantic Ocean and the Mediterranean Sea. In this paper, we have analyzed the ostracod faunas of samples collected from sediments crossed by a long borehole in southwestern Spain. These sediments were deposited in the Betic strait just before the Messinian Salinity Crisis. During the middle Messinian (6.8-6.0 Ma), the scarce and low diversified ostracod assemblages (Krithe, Parakrithe, Henryhowella) are typical of upper bathyal palaeoenvironments (200-400 m water depth). This period includes a short transition (6.26-6.25 Ma) to outer neritic palaeoenvironments, coinciding with a glaciation and characterized by the presence of Acanthocythereis hystrix (Reuss, 1850) and the disappearance of Krithe and Parakrithe. The most abundant species have a wide biostratigraphic distribution, most of them ranging from the Tortonian until the Holocene.

scholarly journals Phylogeography ofDictyota fasciolaandDictyota mediterranea(Dictyotales, Phaeophyceae): unexpected patterns on the Atlantic-Mediterranean marine transition and taxonomic implications

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6916 ◽  
Author(s):  
Daniel Vitales ◽  
Joana Aragay ◽  
Teresa Garnatje ◽  
Amelia Gómez Garreta ◽  
Jordi Rull Lluch
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Point Of View ◽  
Sister Species ◽  
Mediterranean Populations ◽  
Phylogenetic Reconstructions ◽  
Biogeographic Region ◽  
Taxonomic Implications ◽  
The Mediterranean ◽  
Unique Study

The Atlantic-Mediterranean marine transition is a fascinating biogeographic region, but still very poorly studied from the point of view of seaweed phylogeography.Dictyota fasciolaandD. mediterranea(Dictyotales, Phaeophyceae) are two currently recognized sister species that share a large part of their distribution along the Mediterranean Sea and the Atlantic Ocean, representing a unique study model to understand the diversification processes experienced by macroalgae during and after Messinian at this marine region. In this study, we sampled 102 individuals ofD. fasciolaandD. mediterraneafrom 32 localities along their distribution range and sequenced the mitochondrialcox1 and the chloroplastrbcL-rbcS DNA regions for all the samples. Our data do not support the occurrence of two sister species but a morphologically variable and highly genetic diverse species or a complex of species. Most of the observed genetic diversity corresponds to the Mediterranean populations, whereas the Atlantic ones are much more homogeneous. The early-diverged lineages inferred from both mtDNA and cpDNA phylogenetic reconstructions were constituted by samples from the Mediterranean Sea. Together, these results suggest that the Mediterranean Sea acted as a refugium for theD. fasciola–D. mediterranealineage during the geologic and climatic changes occurred on the region since the Miocene, subsequently dispersing to the Atlantic Ocean.

scholarly journals Hydrological relationship between the North Atlantic Ocean and the Mediterranean Sea during the past 15-75 kyr

1999 ◽  
Vol 14 (5) ◽  
pp. 626-638 ◽  
Author(s):  
Martine Paterne ◽  
Nejib Kallel ◽  
Laurent Labeyrie ◽  
Maryline Vautravers ◽  
Jean-Claude Duplessy ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
The Past ◽  
The North ◽  
The North Atlantic ◽  
The Mediterranean

Levels of connectivity between longnose skate (Dipturus oxyrinchus) in the Mediterranean Sea and the north-eastern Atlantic Ocean

2010 ◽  
Vol 12 (2) ◽  
pp. 577-582 ◽  
Author(s):  
Andrew M. Griffiths ◽  
David W. Sims ◽  
Andrew Johnson ◽  
Arve Lynghammar ◽  
Matthew McHugh ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
The North ◽  
Eastern Atlantic Ocean ◽  
North Eastern ◽  
The Mediterranean

scholarly journals Extreme waves and climatic patterns of variability in the eastern North Atlantic and Mediterranean basins

Ocean Science ◽  
2020 ◽  
Vol 16 (6) ◽  
pp. 1385-1398
Author(s):  
Verónica Morales-Márquez ◽  
Alejandro Orfila ◽  
Gonzalo Simarro ◽  
Marta Marcos
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Extreme Waves ◽  
Extreme Wave ◽  
East Atlantic ◽  
The North ◽  
The North Atlantic ◽  
The Mediterranean

Abstract. The spatial and temporal variability of extreme wave climate in the North Atlantic Ocean and the Mediterranean Sea is assessed using a 31-year wave model hindcast. Seasonality accounts for 50 % of the extreme wave height variability in the North Atlantic Ocean and up to 70 % in some areas of the Mediterranean Sea. Once seasonality is filtered out, the North Atlantic Oscillation and the Scandinavian index are the dominant large-scale atmospheric patterns that control the interannual variability of extreme waves during winters in the North Atlantic Ocean; to a lesser extent, the East Atlantic Oscillation also modulates extreme waves in the central part of the basin. In the Mediterranean Sea, the dominant modes are the East Atlantic and East Atlantic–Western Russia modes, which act strongly during their negative phases. A new methodology for analyzing the atmospheric signature associated with extreme waves is proposed. The method obtains the composites of significant wave height (SWH), mean sea level pressure (MSLP), and 10 m height wind velocity (U10) using the instant when specific climatic indices have a stronger correlation with extreme waves.

scholarly journals Last snails standing since the Early Pleistocene, a tale of Calliostomatidae (Gastropoda) living in deep-water coral habitats in the north-eastern Atlantic

Zootaxa ◽  
2019 ◽  
Vol 4613 (1) ◽  
pp. 93-110
Author(s):  
LEON HOFFMAN ◽  
LYDIA BEUCK ◽  
BART VAN HEUGTEN ◽  
MARC LAVALEYE ◽  
ANDRÉ FREIWALD
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Deep Water ◽  
Southern Italy ◽  
Early Pleistocene ◽  
Ne Atlantic ◽  
The North ◽  
North Eastern ◽  
Ne Atlantic Ocean ◽  
Water Coral

Three species in the gastropod genus Calliostoma are confirmed as living in Deep-Water Coral (DWC) habitats in the NE Atlantic Ocean: Calliostoma bullatum (Philippi, 1844), C. maurolici (Seguenza, 1876) and C. leptophyma Dautzenberg & Fischer, 1896. Up to now, C. bullatum was only known as fossil from Early to Mid-Pleistocene outcrops in DWC-related habitats in southern Italy; our study confirmed its living presence in DWC off Mauritania. A discussion is provided on the distribution of DWC-related calliostomatids in the NE Atlantic and the Mediterranean Sea from the Pleistocene to the present. 

scholarly journals Extreme waves and climatic patterns of variability in the Eastern North Atlantic and Mediterranean basins

2020 ◽  
Author(s):  
Verónica Morales-Márquez ◽  
Alejandro Orfila ◽  
Gonzalo Simarro ◽  
Marta Marcos
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Extreme Waves ◽  
Extreme Wave ◽  
East Atlantic ◽  
The North ◽  
The North Atlantic ◽  
The Mediterranean

Abstract. The spatial and temporal variability of extreme wave climate in the North Atlantic Ocean and the Mediterranean Sea is assessed using a 31-year wave model hindcast. Seasonality accounts for 50 % of the extreme wave height variability in North Atlantic Ocean and up to 70 % in some areas of the Mediterranean Sea. Once seasonality is filtered out, the North Atlantic Oscillation and the Scandinavian Index are the dominant large-scale atmospheric patterns that control the interannual variability of extreme waves during winters in the North Atlantic Ocean; and to a lesser extent, the East Atlantic Oscillation also modulates extreme waves in the central part of the basin. In the Mediterranean Sea, the dominant modes are the East Atlantic and East Atlantic/Western Russia modes which act strongly during their negative phases.

scholarly journals A star is torn—molecular analysis divides the Mediterranean population of Poli’s stellate barnacle, Chthamalus stellatus (Cirripedia, Chtamalidae)

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11826
Author(s):  
Yaron Tikochinski ◽  
Sharon Tamir ◽  
Noa Simon-Blecher ◽  
Uzi Motro ◽  
Yair Achituv
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Model Organism ◽  
Population Based ◽  
Western Mediterranean ◽  
Suitable Model ◽  
Mediterranean Population ◽  
Mediterranean Populations ◽  
The North ◽  
The Mediterranean

Poli’s stellate barnacle, Chthamalus stellatus Poli, populates the Mediterranean Sea, the North-Eastern Atlantic coasts, and the offshore Eastern Atlantic islands. Previous studies have found apparent genetic differences between the Atlantic and the Mediterranean populations of C. stellatus, suggesting possible geological and oceanographic explanations for these differences. We have studied the genetic diversity of 14 populations spanning from the Eastern Atlantic to the Eastern Mediterranean, using two nuclear genes sequences revealing a total of 63 polymorphic sites. Both genotype-based, haplotype-based and the novel SNP distribution population-based methods have found that these populations represent a geographic cline along the west to east localities. The differences in SNP distribution among populations further separates a major western cluster into two smaller clusters, the Eastern Atlantic and the Western Mediterranean. It also separates the major eastern cluster into two smaller clusters, the Mid-Mediterranean and Eastern Mediterranean. We suggested here environmental conditions like surface currents, water salinity and temperature as probable factors that have formed the population structure. We demonstrate that C. stellatus is a suitable model organism for studying how geological events and hydrographic conditions shape the fauna in the Mediterranean Sea.

Sign in / Sign up

Export Citation Format

Share Document