Investigation on the genus Squalus in the Sardinian waters (Central-Western Mediterranean) with implications on its management

Bellodi, Andrea; Porcu, Cristina; Cau, Alessandro; Marongiu, Martina Francesca; Melis, Riccardo; Mulas, Antonello; Pesci, Paola; Follesa, María Cristina; Cannas, Rita

doi:10.12681/mms.15426

Cited by 12 publications

(12 citation statements)

References 16 publications

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“…Tsagarakis et al (2013) also reported S. blainville to be one of the most important species of the demersal assemblages in the eastern Ionian Sea. The reason for this replacement between these two sharks could be related to taxonomic problems afflicting the Squalus genus and currently solved in different areas of the Mediterranean (Bonello et al 2016, Bellodi et al 2018. Indeed, recent studies (e.g.…”

Section: Discussionmentioning

confidence: 99%

Spatial variability of Chondrichthyes in the northern Mediterranean

et al. 2020

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Thanks to the availability of the MEDITS survey data, a standardized picture of the occurrence and abundance of demersal Chondrichthyes in the northern Mediterranean has been obtained. During the spring-summer period between 2012 and 2015, 41 Chondrichthyes, including 18 sharks (5 orders and 11 families), 22 batoids (3 orders and 4 families) and 1 chimaera, were detected from several geographical sub-areas (GSAs) established by the General Fisheries Commission for the Mediterranean. Batoids had a preferential distribution on the continental shelf (10-200 m depth), while shark species were more frequent on the slope (200-800 m depth). Only three species, the Carcharhiniformes Galeus melastomus and Scyliorhinus canicula and the Torpediniformes Torpedo marmorata were caught in all GSAs studied. On the continental shelf, the Rajidae family was the most abundant, being represented in primis by Raja clavata and then by R. miraletus, R. polystigma and R. asterias. The slope was characterized by the prevalence of G. melastomus in all GSAs, followed by S. canicula, E. spinax and Squalus blainville. Areas under higher fishing pressure, such as the Adriatic Sea and the Spanish coast (with the exception of the Balearic Islands), show a low abundance of chondrichthyans, but other areas with a high level of fishing pressure, such as southwestern Sicily, show a high abundance, suggesting that other environmental drivers work together with fishing pressure to shape their distribution. Results of generalized additive models highlighted that depth is one of the most important environmental drivers influencing the distribution of both batoid and shark species, although temperature also showed a significant influence on their distribution. The approach explored in this work shows the possibility of producing maps modelling the distribution of demersal chondrichthyans in the Mediterranean that are useful for the management and conservation of these species at a regional scale. However, because of the vulnerability of these species to fishing exploitation, fishing pressure should be further incorporated in these models in addition to these environmental drivers.

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Section: Discussionmentioning

confidence: 99%

Spatial variability of Chondrichthyes in the northern Mediterranean

et al. 2020

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“…Species belonging to the family Squalidae have been under taxonomic revision in recent years, reporting species complexes and describing new species in the area (Bellodi et al, ; Pfleger et al, ; Viana et al, , ; Viana & De Carvalho, ). S. quasimodo has recently been added to the VEEZ, denoting that the species has probably been confused and reported as S. acanthias (L. 1758).…”

Section: Discussionmentioning

confidence: 99%

Updated taxonomic list and conservation status of chondrichthyans from the exclusive economic zone of Venezuela, with first generic and specific records

Ehemann

González-González

Tagliafico

et al. 2019

Journal of Fish Biology

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Using the last taxonomic review of chondrichthyans of the world, we selected the species distributed in the north-western Atlantic Ocean (NWA) and compared it with the available published literature related to the class Chondrichthyes in the Venezuelan exclusive economic zone. We also revised information from worldwide databases such as: FAO (NWA-31 area), GBIF, iSpecies, IUCN and OBIS, as well as available museum collection databases. The taxonomic validity was checked using the Catalogue of Fishes of the California Academy of Sciences and recent references. The past published Venezuelan lists of chondrichthyans combined included nine orders, 30 families and 108 species. The updated list with 12 orders, 36 families and 122 species increased by three new orders, six families, three shark genera, nine shark species (one replacing another species), one chimaera genus, two chimaera species, three batoid genera and six batoid species (two replacing other species). Four holotype specimens (two sharks and two rays) are deposited in Venezuelan Museums. Most of the species have an IUCN conservation status, including four species catalogued as Critically Endangered, six as Endangered and 18 species as Vulnerable. Deepsea fisheries, scientific exploration and taxonomic/genetic revisions might add future increments to the Venezuelan chondrichthyan list. K E Y W O R D S batoids, Caribbean Sea, chimaeras, elasmobranchii, holocephali, sharks

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“…Regarding S. megalops, described for the first time by Muñoz-Chápuli et al (1984), its occurrence in the Mediterranean is still debated and needs to be confirmed (Muñoz-Chápuli & Ramos 1989;Marouani et al 2012;Bonello et al 2015;Kousteni et al 2016;Verissimo et al 2016;Vella et al 2017;Bellodi et al 2018;Giarruso 2019). In any case, specimens of S. megalops for which the identification is considered feasible were rarely reported in the catches (Bonello et al 2015;Bellodi et al 2018). Most of the catches of this species are recorded from the northern coasts of Canary Islands, Morocco and southern Spain (Malaga).…”

Section: Diversity Of Mediterranean and Black Sea Chondrichthyesmentioning

confidence: 99%

Species diversity, taxonomy and distribution of Chondrichthyes in the Mediterranean and Black Sea

Serena

Abella²,

Bargnesi

et al. 2020

The European Zoological Journal

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Species diversity assessments are an important step to evaluate the conservation status of a community, both in marine and terrestrial ecosystems. These assessments are pivotal if related to both, the constant increase of human pressure on ecosystems and the anthropogenic climate change occurring nowadays. Sharks and rays are globally threatened, and the situation is particularly alarming in the Mediterranean Sea where more than 50% of species are listed at risk of extinction by the International Union for Conservation of Nature (IUCN). In this paper, we revise and discuss the chondrichthyan species richness of the Mediterranean and the Black Sea. Through an accurate review of published taxonomic studies, historical data on species occurrence, analyses of scientific survey data and biodiversity databases and other scientific papers, we produced a revised list of species whose presence in the Mediterranean Sea is confirmed or highly probable and discussed on current taxonomic and occurrence disputes on the species that are instead rarer or claimed to be locally extinct. We listed a total of 88 species, representing 30 families and 48 genera that are currently present in the Mediterranean and the Black Sea. This number includes 48 shark species, 38 batoids, and 2 chimaeras. The review represents a reference for future conservation assessments of cartilaginous fish in the region and a guide for decision-makers when promoting the sustainable exploitation of fisheries resource within an ecosystem-based framework. This paper can help to set a baseline of the Mediterranean species and thus resolve some uncertainties regarding their conservation status, explaining the reasons for their prolonged absence in the reports. Indeed, failure to record over time may not be due to grubbing up, but because after careful review this species was not really part of the Mediterranean fauna.

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Investigation on the genus Squalus in the Sardinian waters (Central-Western Mediterranean) with implications on its management

Cited by 12 publications

References 16 publications

Spatial variability of Chondrichthyes in the northern Mediterranean

Spatial variability of Chondrichthyes in the northern Mediterranean

Updated taxonomic list and conservation status of chondrichthyans from the exclusive economic zone of Venezuela, with first generic and specific records

Species diversity, taxonomy and distribution of Chondrichthyes in the Mediterranean and Black Sea

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