Patterns of genetic differentiation between two co-occurring demersal species: the red mullet (Mullus barbatus) and the striped red mullet (Mullus surmuletus)

2009 ◽  
Vol 66 (9) ◽  
pp. 1478-1490 ◽  
Author(s):  
J. A. Galarza ◽  
G. F. Turner ◽  
E. Macpherson ◽  
C. Rico
Keyword(s):  
Gene Flow ◽  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Flow Patterns ◽  
Ecological Features ◽  
Red Mullet ◽  
Mullus Barbatus ◽  
Mullus Surmuletus ◽  
The Mediterranean ◽  
Demersal Species

The accurate identification of genetic partitioning is of primarily importance when devising conservation management strategies for today’s marine resources. The great variety of genetic structure displayed by demersal species underscores the need for the identification of common patterns that can be found across species. Here, we analyse allele frequency variation at 10 microsatellite loci of two congener demersal fish, the red mullet ( Mullus barbatus ) and the striped red mullet ( Mullus surmuletus ), from the Atlantic Ocean and the Mediterranean Sea. The results indicate that two different gene flow patterns exist between these species. The red mullet’s genetic distribution was found to be highly structured, resembling that of a metapopulation composed by independent, self-recruiting subpopulations with some connections between them. The striped red mullet displayed less genetic heterogeneity within the Mediterranean Sea and a substantial gene flow reduction between the Atlantic Ocean and Mediterranean Sea. Our results indicate that gene flow patterns in the demersal environment can be substantially different between closely related species with highly comparable biology, suggesting that biogeographic boundaries can affect demersal species in a different way despite common ecological features and spatial overlap. We conclude that the delimitation of such boundaries could be determined by the fine differences in life history traits between species.

scholarly journals Evidence of subtle genetic structure in the sympatric species Mullus barbatus and Mullus surmuletus (Linnaeus, 1758) in the Mediterranean Sea

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Sanja Matić-Skoko ◽  
Tanja Šegvić-Bubić ◽  
Ivana Mandić ◽  
David Izquierdo-Gomez ◽  
Enrico Arneri ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Mediterranean Sea ◽  
Sympatric Species ◽  
Mullus Barbatus ◽  
Mullus Surmuletus ◽  
The Mediterranean

scholarly journals Genetic diversity increases with depth in red gorgonian populations of the Mediterranean Sea and the Atlantic Ocean

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6794 ◽  
Author(s):  
Joanna Pilczynska ◽  
Silvia Cocito ◽  
Joana Boavida ◽  
Ester A. Serrão ◽  
Jorge Assis ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Thermal Stress ◽  
Gene Flow ◽  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Environmental Conditions ◽  
Heat Waves ◽  
Genetic Erosion ◽  
Linear Pattern ◽  
The Mediterranean

Background In the ocean, the variability of environmental conditions found along depth gradients exposes populations to contrasting levels of perturbation, which can be reflected in the overall patterns of species genetic diversity. At shallow sites, resource availability may structure large, persistent and well-connected populations with higher levels of diversity. In contrast, the more extreme conditions, such as thermal stress during heat waves, can lead to population bottlenecks and genetic erosion, inverting the natural expectation. Here we examine how genetic diversity varies along depth for a long-lived, important ecosystem-structuring species, the red gorgonian, Paramuricea clavata. Methods We used five polymorphic microsatellite markers to infer differences in genetic diversity and differentiation, and to detect bottleneck signs between shallow and deeper populations across the Atlantic Ocean and the Mediterranean Sea. We further explored the potential relationship between depth and environmental gradients (temperature, ocean currents, productivity and slope) on the observed patterns of diversity by means of generalized linear mixed models. Results An overall pattern of higher genetic diversity was found in the deeper sites of the Atlantic Ocean and the Mediterranean Sea. This pattern was largely explained by bottom temperatures, with a linear pattern of decreasing genetic diversity with increasing thermal stress. Genetic differentiation patterns showed higher gene flow within sites (i.e., shallow vs. deeper populations) than between sites. Recent genetic bottlenecks were found in two populations of shallow depths. Discussion Our results highlight the role of deep refugial populations safeguarding higher and unique genetic diversity for marine structuring species. Theoretical regression modelling demonstrated how thermal stress alone may reduce population sizes and diversity levels of shallow water populations. In fact, the examination of time series on a daily basis showed the upper water masses repeatedly reaching lethal temperatures for P. clavata. Differentiation patterns showed that the deep richer populations are isolated. Gene flow was also inferred across different depths; however, not in sufficient levels to offset the detrimental effects of surface environmental conditions on genetic diversity. The identification of deep isolated areas with high conservation value for the red gorgonian represents an important step in the face of ongoing and future climate changes.

scholarly journals Morphological characterization of Dujardinascaris spp. (Nematoda: Anisakidae) from the striped red mullet Mullus surmuletus in the Mediterranean Sea

2019 ◽  
Vol 56 (4) ◽  
pp. 338-346 ◽  
Author(s):  
R. Gamal Taha Hassan
Keyword(s):  
Mediterranean Sea ◽  
Dorsal Surface ◽  
Demersal Fish ◽  
The Body ◽  
Economic Losses ◽  
Helminth Parasites ◽  
New Host ◽  
Red Mullet ◽  
Mullus Surmuletus ◽  
The Mediterranean

SummaryThe striped red mullet Mullus surmuletus (Linnaeus, 1758) (Perciformis: Mullidae) has a high commercial value and therewithal is a common demersal fish of the Mediterranean Sea, therefore studying the helminth parasites of this fish is required. Anisakids nematodes are common parasites of animals including human causing economic losses and different parasitic diseases. During the present study, the nematode Dujardinascaris spp. (Anisakidae) was described from the body cavity and small intestine of Mullus surmuletus in the Alexandria, Mediterranean Sea, Egypt as new host and new geographical record. Forty-five (37.5%) fish out of (120) were found infected by the parasite. The morphological features of the collected nematode were investigated by both light and scanning electron microscopy. The study revealed that the specimens were characterized from other species of the genus by the presence of two large lateral pouches attached to each cephalic lip, the different large-sized papillae on the cephalic region and on the dorsal surface of the nematode cuticle.

scholarly journals Microsatellite analysis of red mullet Mullus barbatus (Perciformes, Mullidae) reveals the isolation of the Adriatic Basin in the Mediterranean Sea

2009 ◽  
Vol 66 (9) ◽  
pp. 1883-1891 ◽  
Author(s):  
Teresa Maggio ◽  
Sabrina Lo Brutto ◽  
Flavio Garoia ◽  
Fausto Tinti ◽  
Marco Arculeo
Keyword(s):  
Genetic Differentiation ◽  
Bayesian Analysis ◽  
Mediterranean Sea ◽  
Microsatellite Analysis ◽  
Restricted Gene Flow ◽  
Tyrrhenian Sea ◽  
Red Mullet ◽  
Mullus Barbatus ◽  
The Mediterranean ◽  
Adriatic Basin

Abstract Maggio, T., Lo Brutto, S., Garoia, F., Tinti, F., and Arculeo, M. 2009. Microsatellite analysis of red mullet Mullus barbatus (Perciformes, Mullidae) reveals the isolation of the Adriatic Basin in the Mediterranean Sea. – ICES Journal of Marine Science, 66: 1883–1891. The red mullet Mullus barbatus is commercially one of the most important demersal fish resources in the Mediterranean. Molecular data on its genetic population structure throughout the Mediterranean are reported. Six microsatellite loci displayed a high degree of expected heterozygosity and a high allele number per locus. The Hardy–Weinberg equilibrium test revealed an overall tendency towards heterozygote deficiency, probably caused by the admixture of various demes. Population differentiation was assessed by analysis of molecular variance (AMOVA) and Bayesian analysis. AMOVA showed that most of the variation was within the population, but the mean value of FST was significant, indicating genetic differentiation among the samples analysed. This differentiation is primarily attributable to the isolation of the Adriatic samples and partly to a weaker substructuring of the populations in the Gulf of Lions, Tyrrhenian Sea, Strait of Sicily, and Ionian Sea. Bayesian analysis also revealed genetic differentiation among the samples analysed, identifying two genetic clusters. The restricted gene flow from and to the Adriatic, also recorded for other fish species, most likely reflects the environmental separation of the Adriatic and suggests that management protocols for the red mullet in the Mediterranean should be revisited.

A Near-Uniform Basin-Wide Sea Level Fluctuation of the Mediterranean Sea

2007 ◽  
Vol 37 (2) ◽  
pp. 338-358 ◽  
Author(s):  
Ichiro Fukumori ◽  
Dimitris Menemenlis ◽  
Tong Lee
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Sea Level ◽  
Ocean Circulation ◽  
Large Scale ◽  
Circulation Model ◽  
Level Fluctuation ◽  
Strait Of Gibraltar ◽  
Sea Level Fluctuation ◽  
The Mediterranean

Abstract A new basin-wide oscillation of the Mediterranean Sea is identified and analyzed using sea level observations from the Ocean Topography Experiment (TOPEX)/Poseidon satellite altimeter and a numerical ocean circulation model. More than 50% of the large-scale, nontidal, and non-pressure-driven variance of sea level can be attributed to this oscillation, which is nearly uniform in phase and amplitude across the entire basin. The oscillation has periods ranging from 10 days to several years and has a magnitude as large as 10 cm. The model suggests that the fluctuations are driven by winds at the Strait of Gibraltar and its neighboring region, including the Alboran Sea and a part of the Atlantic Ocean immediately to the west of the strait. Winds in this region force a net mass flux through the Strait of Gibraltar to which the Mediterranean Sea adjusts almost uniformly across its entire basin with depth-independent pressure perturbations. The wind-driven response can be explained in part by wind setup; a near-stationary balance is established between the along-strait wind in this forcing region and the sea level difference between the Mediterranean Sea and the Atlantic Ocean. The amplitude of this basin-wide wind-driven sea level fluctuation is inversely proportional to the setup region’s depth but is insensitive to its width including that of Gibraltar Strait. The wind-driven fluctuation is coherent with atmospheric pressure over the basin and contributes to the apparent deviation of the Mediterranean Sea from an inverse barometer response.

scholarly journals Health and reproduction of red mullet, Mullus barbatus, in the western Mediterranean Sea

Hydrobiologia ◽  
2015 ◽  
Vol 753 (1) ◽  
pp. 189-204 ◽  
Author(s):  
Dolors Ferrer-Maza ◽  
Marta Muñoz ◽  
Josep Lloret ◽  
Elisabeth Faliex ◽  
Sílvia Vila ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Western Mediterranean ◽  
Western Mediterranean Sea ◽  
Red Mullet ◽  
Mullus Barbatus

Philometra barbata n. sp. (Nematoda: Philometridae) from the red mullet Mullus barbatus (Perciformes, Mullidae) off Tunisia

2018 ◽  
Vol 63 (4) ◽  
pp. 766-771 ◽  
Author(s):  
Nessrine Ghanmi ◽  
David González-Solís ◽  
Lamia Gargouri
Keyword(s):  
New Species ◽  
Mediterranean Sea ◽  
Body Length ◽  
Nematode Species ◽  
The Body ◽  
Nominal Species ◽  
Congeneric Species ◽  
Red Mullet ◽  
Mullus Barbatus ◽  
The Family

Abstract Helminthological examinations of the red mullet Mullus barbatus (Linnaeus) (Mullidae) from the Gulf of Hammamet, off Tunisia, revealed the presence of one undescribed gonad-infecting nematode species, Philometra barbata n. sp. (Philometridae). The new species as other congeneric species is mainly characterized by the shape of the caudal mound, the distribution of the caudal papillae and the shape of the gubernaculum with the presence of a dorsal protuberance consisting of two dorsolateral lamellar parts separated from each other by a smooth median field in the male. The new species differs from its gonadinfecting congeners in the body length of male, the length of spicules and gubernaculum. This is the second nominal species of Philometra reported from fishes of the family Mullidae and the 14th from the Mediterranean Sea.

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