Genetic and Distribution Data of the Bramble Shark Echinorhinus brucus (Bonnaterre, 1788) and the Prickly Shark Echinorhinus cookei Pietschmann, 1928 to Better Reconstruct Their Conservation Status

Animals, Journal Year: 2024, Volume and Issue: 14(7), P. 993 - 993

Published: March 23, 2024

Elasmobranch species show low resilience in relation to anthropogenic stressors such as fishing efforts, loss of habitats, and climate change. In this sense, the elasmobranch populations appear be at risk extinction many cases. Despite conservation researchers making efforts implement knowledge, information on biology, reproduction, distribution, or genetic structure some is still scattered, often caused by occurrence inaccessible habitats. Echinorhinus brucus a deep benthic shark evaluated “Endangered” which little available, particularly about its geographical range structure, while E. cookei listed “Data Deficient”. belongs Echinorhinidae family, unique congeneric cookei. The main morphological diagnostic characteristic both presence denticles with different shapes patterns derma. present paper, mitochondrial COI NADH2 sequences were retrieved from species, analyses conducted applying models phylogenetic inference. Sequences captured Indian Ocean (IOS) did not cluster Atlantic counterparts (AOS) but instead sequences; showed an overlapping tree topology. Concurrently, review historical recent captures two was carried out. worldwide distribution excludes Pacific area, where occurs, characterised presumably current local extinctions North Sea western Mediterranean Sea. dataset describes definite areas significantly high abundance located (Brazil) (India). These suggest zones for plans, especially considering lineages identified through molecular approaches.

Language: Английский

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The sensory shark: high-quality morphological, genomic and transcriptomic data for the small-spotted catsharkScyliorhinus caniculareveal the molecular bases of sensory organ evolution in jawed vertebrates

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: May 24, 2024

Abstract Cartilaginous fishes (chimaeras and elasmobranchs -sharks, skates rays) hold a key phylogenetic position to explore the origin diversifications of jawed vertebrates. Here, we report integrate reference genomic, transcriptomic morphological data in small-spotted catshark Scyliorhinus canicula shed light on evolution sensory organs. We first characterise general aspects genome, confirming high conservation genome organisation across cartilaginous fishes, investigate population genomic signatures. Taking advantage dense sampling data, also identify gene signatures for all major organs, including chondrichthyan specializations, evaluate expression between paralogs within families involved functions. Finally, combine these with 3D synchrotron imaging situ analyses chondrichthyan-specific traits more evolutionary trends systems. This approach brings light, among others, novel markers ampullae Lorenzini electro-sensory cells, duplication hotspot crystallin genes conserved vertebrates, new metazoan clade Transient-receptor potential (TRP) family. These resources results, obtained an experimentally tractable model, open avenues multiomics study

Language: Английский

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The sensory shark: high-quality morphological, genomic and transcriptomic data for the small-spotted catshark Scyliorhinus canicula reveal the molecular bases of sensory organ evolution in jawed vertebrates

Molecular Biology and Evolution, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 6, 2024

Abstract Cartilaginous fishes (chondrichthyans: chimaeras and elasmobranchs -sharks, skates rays) hold a key phylogenetic position to explore the origin diversifications of jawed vertebrates. Here, we report integrate reference genomic, transcriptomic morphological data in small-spotted catshark Scyliorhinus canicula shed light on evolution sensory organs. We first characterise general aspects genome, confirming high conservation genome organisation across cartilaginous fishes, investigate population genomic signatures. Taking advantage dense sampling data, also identify gene signatures for all major organs, including chondrichthyan specializations, evaluate expression between paralogs within families involved functions. Finally, combine these with 3D synchrotron imaging situ analyses chondrichthyan-specific traits more evolutionary trends systems. This approach brings light, among others, novel markers ampullae Lorenzini electro-sensory cells, duplication hotspot crystallin genes conserved vertebrates, new metazoan clade transient-receptor potential (TRP) family. These resources results, obtained an experimentally tractable model, open avenues multiomics study

Language: Английский

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Looking into the prevalence of bycatch juveniles of critically endangered elasmobranchs: a case study from pelagic longline and trammel net fisheries of the Asinara Gulf (western Mediterranean)

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10

Published: Nov. 28, 2023

Bycatch of cartilaginous species is considered one the main drivers for dramatic declines observed in many populations. Pelagic longlines and passive nets impact depending on their life stage habitat use. Here, we present an updated list incidental catches collected through a 4-year fishery-dependent survey. We documented bycatch four critically endangered species, particularly 13 individuals Isurus oxyrinchus , Prionace glauca Mobula mobular by specimen Lamna nasus trammel Asinara Gulf (Northern Sardinia, Italy). As almost all specimens were juveniles or newborns, explored discussed potential explaining prevalence sample. Despite our low sample size, possible options discussed, role as Important Shark Ray Area (ISRA) large pelagic elasmobranch worth considering.

Language: Английский

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Copper, lead, and cadmium monitoring via the small-spotted catshark (Scyliorhinus canicula; Linnaeus, 1758): space–time driven variability in Western Mediterranean populations

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(39), P. 51300 - 51311

Published: Aug. 6, 2024

Language: Английский

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I Like This New Me: Unravelling Population Structure of Mediterranean Electric Rays and Taxonomic Uncertainties within Torpediniformes

Animals, Journal Year: 2023, Volume and Issue: 13(18), P. 2899 - 2899

Published: Sept. 13, 2023

The present study focused on the three species of electric rays known to occur in Mediterranean Sea: Torpedo torpedo, marmorata and Tetronarce nobiliana. Correct identification specimens is needed properly assess impact fisheries populations species. Unfortunately, torpedoes share high morphological similarities, boosting episodes field misidentification. In this context, genetic data was used (1) identify caught during fishing operations, (2) measure diversity among within these species, (3) shed light possible occurrence additional hidden investigated area. New already published sequences COI NADH2 mitochondrial genes were analyzed, both at a small scale along Sardinian coasts (Western Mediterranean) large whole Sea. High levels found populations, being significantly different from other areas Eastern Sea due biotic abiotic factors here discussed. can hence be indicated as priority populations/areas protected Moreover, sequence confirmed that only application several ‘species-delimitation’ methods evidence cryptic outside Sea, well genera/families, suggesting urgent need for future studies comprehensive revision order Torpediniformes its effective conservation.

Language: Английский

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On the genetic diversity of Chimaera monstrosa Linnaeus, 1758 (Chordata, Chondrichthyes, Holocephali) in the Mediterranean Sea

Frontiers in Fish Science, Journal Year: 2024, Volume and Issue: 2

Published: Feb. 9, 2024

The sustainable management and conservation of deep-sea species may be hampered by the paucity data on their population structure connectivity, in face ever-increasing fisheries pressure other forms impacts ecosystems. rabbit fish, Chimaera monstrosa , is a cartilaginous reported worldwide past, but currently distributed only North-Eastern Atlantic Ocean Mediterranean Sea. It experiencing high levels mortality associated with by-catch. Its slow growth, low fecundity late maturity make this particularly vulnerable to anthropogenic impact, although little known about processes connectivity between ecoregions. This study utilized DNA sequencing mitochondrial cytochrome c oxidase subunit I (COI) gene investigate demography C. both at small (around coasts Sardinia, western Sea) larger spatial scales (at pan-Mediterranean level, Sea). A total 100 new sequences were obtained from specimens origin, identifying 15 haplotypes out 30 so far for species. Evidence feeble significant differentiation was detected among locations within Tyrrhenian basin. Bayesian clustering analyses indicated occurrence three distinct haplogroups: most common spread all over Mediterranean, two limited Western Greater genetic found populations which constituted main clusters, no shared haplotypes. became separated end Middle Pleistocene, clear sign demographic expansion during same period. fish constitutes an important exception general paradigm being connected flow such results could useful implement current strategies conserve by-caught

Language: Английский

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Reply to Soldo, A.; Lipej, L. Comment on “Balàka et al. Updated Checklist of Chondrichthyan Species in Croatia (Central Mediterranean Sea). Biology 2023, 12, 952”

Biology, Journal Year: 2024, Volume and Issue: 13(3), P. 136 - 136

Published: Feb. 21, 2024

Balàka et al [...]

Language: Английский

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Population Genomics of the Blue Shark, Prionace glauca, Reveals Different Populations in the Mediterranean Sea and the Northeast Atlantic

Evolutionary Applications, Journal Year: 2024, Volume and Issue: 17(9)

Published: Sept. 1, 2024

Populations of marine top predators have been sharply declining during the past decades, and one-third chondrichthyans are currently threatened with extinction. Sustainable management measures conservation plans large pelagic sharks require knowledge on population genetic differentiation demographic connectivity. Here, we present case Mediterranean blue shark (

Language: Английский

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Copper, lead and cadmium monitoring via the Small-spotted catshark (Scyliorhinus canicula; Linnaeus, 1758): space-time driven variability in Western Mediterranean populations

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Aug. 29, 2023

The philopatric and sedentary nature of female Scyliorhinus canicula, its high abundance as a bycatch resilience to regular exploitation by bottom trawl fisheries widespread distribution, make it potentially good candidate biomonitor species. To evaluate this potential, Microwave Assisted Extraction (MAE) Graphite Furnace Atomic Absorption Spectrometry (GF-AAS) were used analyse Pb, Cd Cu in muscle tissue individuals captured the Western Mediterranean (Alicante, Spain). A monthly assessment concentration these three analytes was conducted from November 2019 2020 with 300 individuals. Results showed existence slightly higher mean concentrations during warmer seasons for Pb peaking Autumn Spring case Cd. Significant differences analyte found between non-consecutive months suggested gradual variability time. Although space-wise, time-persistent hotspots observed throughout sample area, magnitude appeared be variable time should evaluated future studies.

Language: Английский

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