First documented presence of Galeocerdo cuvier (Péron &amp; Lesueur, 1822) (ELASMOBRANCHII, CARCHARHINIDAE) in the Mediterranean basin (Libyan waters)

Tobuni, Ibrahim M.; Benabdallah, Ben-Abdallah R.; Serena, Fabrizio; Shakman, Esmail

doi:10.1186/s41200-016-0089-3

Cited by 9 publications

(4 citation statements)

References 11 publications

(10 reference statements)

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“…Moreover, recently was confirmed the presence of G . cuvier from Mediterranean Sea by captures of juveniles specimens in Libya [ 24 ]. Therefore, in this study, these citations have been considered as records of vagrant species.…”

Section: Methodsmentioning

confidence: 99%

Historical and ecological drivers of the spatial pattern of Chondrichthyes species richness in the Mediterranean Sea

et al. 2017

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Chondrichthyes, which include Elasmobranchii (sharks and batoids) and Holocephali (chimaeras), are a relatively small group in the Mediterranean Sea (89 species) playing a key role in the ecosystems where they are found. At present, many species of this group are threatened as a result of anthropogenic effects, including fishing activity. Knowledge of the spatial distribution of these species is of great importance to understand their ecological role and for the efficient management of their populations, particularly if affected by fisheries. This study aims to analyze the spatial patterns of the distribution of Chondrichthyes species richness in the Mediterranean Sea. Information provided by the studied countries was used to model geographical and ecological variables affecting the Chondrichthyes species richness. The species were distributed in 16 Operational Geographical Units (OGUs), derived from the Geographical Sub-Areas (GSA) adopted by the General Fisheries Commission of the Mediterranean Sea (GFCM). Regression analyses with the species richness as a target variable were adjusted with a set of environmental and geographical variables, being the model that links richness of Chondrichthyes species with distance to the Strait of Gibraltar and number of taxonomic families of bony fishes the one that best explains it. This suggests that both historical and ecological factors affect the current distribution of Chondrichthyes within the Mediterranean Sea.

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Section: Methodsmentioning

confidence: 99%

Historical and ecological drivers of the spatial pattern of Chondrichthyes species richness in the Mediterranean Sea

et al. 2017

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“…Several exotic elasmobranchs have recently been recorded in the Mediterranean (S1 Table), however their particular status (vagrant, alien, or established) is still under debate [48,54–57]. The presence of six species ( Carcharhinus melanopterus , Dipturus batis complex, Torpedo alexandrinsis , Leucoraja fullonica , Raja africana ), however, has not been confirmed [50,58–61].…”

Section: Introductionmentioning

confidence: 99%

Improving the Conservation of Mediterranean Chondrichthyans: The ELASMOMED DNA Barcode Reference Library

et al. 2017

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Cartilaginous fish are particularly vulnerable to anthropogenic stressors and environmental change because of their K-selected reproductive strategy. Accurate data from scientific surveys and landings are essential to assess conservation status and to develop robust protection and management plans. Currently available data are often incomplete or incorrect as a result of inaccurate species identifications, due to a high level of morphological stasis, especially among closely related taxa. Moreover, several diagnostic characters clearly visible in adult specimens are less evident in juveniles. Here we present results generated by the ELASMOMED Consortium, a regional network aiming to sample and DNA-barcode the Mediterranean Chondrichthyans with the ultimate goal to provide a comprehensive DNA barcode reference library. This library will support and improve the molecular taxonomy of this group and the effectiveness of management and conservation measures. We successfully barcoded 882 individuals belonging to 42 species (17 sharks, 24 batoids and one chimaera), including four endemic and several threatened ones. Morphological misidentifications were found across most orders, further confirming the need for a comprehensive DNA barcoding library as a valuable tool for the reliable identification of specimens in support of taxonomist who are reviewing current identification keys. Despite low intraspecific variation among their barcode sequences and reduced samples size, five species showed preliminary evidence of phylogeographic structure. Overall, the ELASMOMED initiative further emphasizes the key role accurate DNA barcoding libraries play in establishing reliable diagnostic species specific features in otherwise taxonomically problematic groups for biodiversity management and conservation actions.

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“…Other records in the database refer to less (I. oxyrinchus, G. altavela, A. vulpinus, H. griseus) or rarely observed species (Alopias superciliosus, Sphyrna zygaena, Squatina squatina, and Squatina oculata). Among the rarely sighted species, some observations can be considered as the first record of the species in the Mediterranean Sea: Sphyrna mokarran (Boero & Carli, 1977) and the recently well-documented first occurrence of Galeocerdo cuvier (Tobuni et al, 2016). Furthermore, some records reported the first observation of a species in national waters, such as Taeniurops grabatus in Italy and Syria (Serena et al, 1999a;Ali et al, 2013) and Himantura uarnak in Syria .…”

Section: Resultsmentioning

confidence: 99%

MEDLEM database, a data collection on large Elasmobranchs in the Mediterranean and Black seas

Mancusi¹,

Baino²,

Fortuna

et al. 2020

Medit. Mar. Sci.

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The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains over 3000 records (more than 4000 individuals) of large elasmobranch species from 20 different countries around the Mediterranean and Black seas, observed from 1666 to 2017. The main species included in the archive are the devil fish (1 813 individuals), the basking shark (939 individuals), the blue shark (585 individuals) and the great white shark (337 individuals).In the last decades other species such as the shortfin mako (166 individuals), the spiny butterfly ray (138) and the thresher shark (174 individuals) were reported with an increasing frequency. This was possibly due to an increased public awareness on the conservation status of sharks, and a consequent development of new monitoring programmes. MEDLEM does not have a homogeneous reporting coverage throughout the Mediterranean and Black seas and it should be considered as a database of observed species presence. Scientific monitoring efforts in the south-eastern Mediterranean and Black seas are generally lower than in the northern sectors and the absence in our database of some species does not imply their actual absence in these regions. Some considerations are made on the frequency and spatial distribution of records, size structure of the observed individuals for selected species, general area coverage and species involved as by-catch by fishing gear.

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First documented presence of Galeocerdo cuvier (Péron & Lesueur, 1822) (ELASMOBRANCHII, CARCHARHINIDAE) in the Mediterranean basin (Libyan waters)

Cited by 9 publications

References 11 publications

Historical and ecological drivers of the spatial pattern of Chondrichthyes species richness in the Mediterranean Sea

Historical and ecological drivers of the spatial pattern of Chondrichthyes species richness in the Mediterranean Sea

Improving the Conservation of Mediterranean Chondrichthyans: The ELASMOMED DNA Barcode Reference Library

MEDLEM database, a data collection on large Elasmobranchs in the Mediterranean and Black seas

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