Restricted connectivity and population genetic fragility in a globally endangered Hammerhead Shark

Reviews in Fish Biology and Fisheries, Journal Year: 2020, Volume and Issue: 30(3), P. 501 - 517

Published: June 7, 2020

Language: Английский

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Identifying barriers to gene flow and hierarchical conservation units from seascape genomics: a modelling framework applied to a marine predator

Ecography, Journal Year: 2022, Volume and Issue: 2022(7)

Published: March 28, 2022

The ongoing decline of large marine vertebrates must be urgently mitigated, particularly under increasing levels climate change and other anthropogenic pressures. However, characterizing the connectivity among populations remains one greatest challenges for effective conservation an number endangered species. Achieving targets requires understanding which seascape features influence dispersal subsequent genetic structure. This is challenging adult‐disperser species, when distribution‐wide sampling difficult. Here, we developed a two‐step modelling framework to investigate how drive species without larval dispersal, better guide design protected area networks corridors. We applied this grey reef shark, Carcharhinus amblyrhynchos , reef‐associated shark distributed across tropical Indo‐Pacific. In first step, genomic approach based on isolation‐by‐resistance models involving circuit theory 515 samples, genotyped 4991 nuclear single‐nucleotide polymorphisms. show that deep oceanic areas act as strong barriers while proximity habitat facilitates dispersal. second predicted resulting differentiation entire distribution range providing both local global‐scale units future management guidance. found are more fragmented than expected such mobile raising concerns about resilience isolated high recommend use identify gene flow help in delineation at different scales, together with its integration multiple considering spatial planning.

Language: Английский

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Status assessment and opportunities for improving fish welfare in animal experimental research according to the 3R-Guidelines

Reviews in Fish Biology and Fisheries, Journal Year: 2023, Volume and Issue: 33(4), P. 1075 - 1093

Published: May 12, 2023

Abstract In mammalian research, the implementation of 3Rs is ubiquitous. However, adaptation procedures for experimental work on fish seems less extensive in comparison, even though model organisms are common a broad range research fields already. To strengthen animal welfare we provide an overview current results, including studies nociception fishes. Furthermore, describe potential implementing research. context "Reduction", show alternative methods to lethal sampling. Considering "Refinement", point out possibilities improve handling and indicate that adaptations individual species ecology necessary. Under aspect "Replacement", high cell cultures can be obtained from tissue give already use ecotoxicology virology. addition, illustrate could also increasingly used basic Graphical abstract

Language: Английский

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Local adaptive variation in a highly migratory fish: The smooth hammerhead shark Sphyrna zygaena

Ecological Genetics and Genomics, Journal Year: 2024, Volume and Issue: 31, P. 100233 - 100233

Published: Feb. 22, 2024

Language: Английский

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The legacy of Jack Musick for the development of elasmobranch research in Brazil

Fisheries, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

Abstract The late John Andrew Musick (1941–2021), widely known as Jack Musick, was a prominent marine scientist of the Virginia Institute Marine Science who worked chiefly on sea turtles (Chelonioidea) and elasmobranchs. Here, we aim to disclose Jack’s impact development elasmobranch research in Brazil by reconstructing academic genealogy compiling volume scientific production authored Jack-linked researchers. We found 64 researchers Brazil, distributed into four generations, from children great-great-grandchildren, with women predominating (~60%) second generation onwards. They produced 252 articles elasmobranchs until September 2023. Potamotrygonidae most studied family (57 publications), followed Carcharhinidae (35), while multifamily studies comprised 60 publications. Genetic-based prevailed output, steep increase starting 2005. influence is revealed not only production, but also foci, including life history, feeding, age growth, reproduction, genetics, fisheries, conservation. conclude that contribution highly influential pervasive science thus pivotal convey his legacy for future generations scientists.

Language: Английский

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Genetic diversity of painted terrapin (Batagur borneoensis) using mitochondrial DNA D- Loop Region at Setiu River, Terengganu

IOP Conference Series Earth and Environmental Science, Journal Year: 2025, Volume and Issue: 1445(1), P. 012074 - 012074

Published: Jan. 1, 2025

Abstract The Painted Terrapin ( Batagur borneoensis ), a critically endangered freshwater turtle in Malaysia, is facing rapid decline due to adult and egg harvesting for food habitat loss from beachfront development. This study aimed assess genetic diversity random nesting sites along the Setiu River. Mitochondrial DNA (mtDNA) saliva samples of B. was extracted, PCR amplified using D-Loop primer, sequenced analysed, revealing two main haplotypes with low haplotype nucleotide (Hd=0.0952, π=0.00015). Both form single clade, indicating they originate same maternal lineage. In addition, Hd π values indicate within population at river low. results underscore critical importance focused conservation efforts protect this species besides needing increase sample size give more accurate assessment on structure .

Language: Английский

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Unwedging the Secrets: Species and Genetic Diversity of Wedgefishes (Rhinidae) in Malaysian Waters

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(3)

Published: March 1, 2025

ABSTRACT The wedgefishes (Rhinidae) stand out as one of the most endangered marine lineages due to conjunction shallow coastal habitats, slow growth, low fecundity and high fishing pressure. Indo‐West Pacific region, including Malaysia, is particular interest it hosts a large share wedgefish diversity. Here, we shed light on species genetic diversity found in Malaysian waters. A total 85 Rhynchobatus samples were collected at 15 locations over 7 years across Malaysia identified using both morphological characters genetics. We highlight difficulty identifying based alone, that molecular confirmation was needed for ambiguous specimens. australiae , broadly distributed represented fraction (87%), followed by R. palpebratus (11%) single springeri individual. occurrence new record this indicates wider distribution than previously thought. Population analysis within revealed fine‐scale structuring Strait Malacca, notwithstanding fact relatively small waterway does not obviously hinder movement along coast. These results reinforce importance manage protect these populations

Language: Английский

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Elasmobranch research in the Mediterranean Sea: What is known, what is not, how it changed, and where it needs to go

Fisheries Research, Journal Year: 2025, Volume and Issue: 285, P. 107328 - 107328

Published: March 17, 2025

Language: Английский

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Strong genetic differentiation and low genetic diversity in a habitat‐forming fucoid seaweed (Cystophora racemosa) across 850 km of its range

Journal of Phycology, Journal Year: 2025, Volume and Issue: unknown

Published: May 3, 2025

Abstract Temperate seaweed forests are among the most productive and widespread habitats in coastal waters. However, they under threat from climate change other anthropogenic stressors. To effectively conserve manage these ecosystems rising pressures, an understanding of genetic diversity structure habitat‐forming seaweeds will be necessary. Australia's Great Southern Reef, a global hotspot endemic diversity, is home to one world's speciose genera, Cystophora (order Fucales). Despite severe declines some species, genomic data on this genus remain limited. We used reduced representation approach (DaRTSeq) investigate racemosa , dominant canopy‐forming across ~850 km its range. Our sequencing captured 4741 high‐quality single nucleotide polymorphisms (SNPs), we distinguished neutral loci those natural selection (i.e., outlier loci). identified strong population high differentiation for both (mean F ST = 0.404) 0.901). Across populations, was low (neutral: mean H E 0.046; outlier: 0.042), with inferred inbreeding (neutral IS 0.531) no evidence isolation‐by‐distance. Several SNPs ( n 70) were observed putatively adaptive, (97%) correlated annual maximum sea surface temperature (SST, °C), indicating local adaptation key ocean variable. results show that C. populations have differentiation, which may increase vulnerability important foundation species change.

Language: Английский

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Genetic diversity in the American elephantfish (Chimaeriformes: Callorhinchus callorynchus) and among its congeners

Journal of Fish Biology, Journal Year: 2025, Volume and Issue: unknown

Published: May 12, 2025

Abstract Understanding genetic population structure and connectivity is essential for effective species‐specific management conservation strategies. The American elephantfish Callorhinchus callorynchus targeted retained as incidental catch in commercial recreational fisheries Chile Argentina. Its wide‐ranging distribution across southern South America may require transnational co‐operation to ensure sustainable use, but its current not known. In this work, we analysed the levels of diversity differentiation within C. using two mitochondrial markers, control region (CR) cytochrome oxidase subunit I gene (CO1). Moreover, assessed within, divergence among, three extant callorhinchids (genus ), a group that exhibits allopatric geographical distributions hemisphere. Overall, sequence analyses CR CO1 revealed extremely low variation both among species. Genetic homogeneity was found throughout range coupled low‐frequency haplotype sharing spatially distant locations Argentina, suggesting flow along coast. our supported scenario recent expansion species America. Given absence dispersive eggs or juvenile stages chondrichthyans, mainly mediated by actively swimming adults. Based on available data, appears occur continuous coastal regions, with deep oceanic waters serving strong barriers. Findings here provide an important baseline future research dispersal holocephalans.

Language: Английский

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