Age, growth, and intrinsic sensitivity of Endangered Spinetail Devil Ray (Mobula mobular) and Bentfin Devil Ray (M. thurstoni) in the Indian Ocean DOI Creative Commons
Ellen Barrowclift, Andrew J. Temple, Sebastián A. Pardo

et al.

Marine Biology, Journal Year: 2024, Volume and Issue: 172(2)

Published: Dec. 30, 2024

Devil rays (Mobula spp.) are caught in fisheries across the Indian Ocean, with reports of significant recent declines catch and sightings. Globally, few populations studied have extremely low population growth rates due to fecundity long reproductive cycles, making them highly vulnerable overfishing. To allow for assessment current sustainability devil ray we provide estimates age using caudal vertebrae; somatic a Bayesian, multi-model approach; maximum intrinsic rate increase (r max ); fishing mortality Endangered Spinetail Ray mobular) Bentfin (M. thurstoni) sampled from small-scale Indonesia, Kenya, Pakistan. The oldest individuals (n = 79) 59) were 17.5 six years, respectively. Both species had relatively coefficients (k 0.05 g 0.19 year-1, respectively), von Bertalanffy logistic models providing best fitting models, r (0.109 0.107 respectively) indicating that they sensitive overexploitation. Fishing F (0.16 0.18 higher than exploitation ratio E (0.77 0.80, an optimum value 0.5 biological both species, suggesting catches unsustainable. We demonstrate approach assess data-poor apply this two Ocean species. results highlight urgent need better management actions reduce all prevent extinction aid recovery. online version contains supplementary material available at 10.1007/s00227-024-04564-6.

Language: Английский

Genetic and Morphometric Support for the Atlantic Pygmy Devil Ray, Mobula hypostoma (Bancroft, 1831), in the Eastern Atlantic Ocean DOI Creative Commons
Emily Humble, Atlantine Boggio‐Pasqua,

Aristide Takoukam Kamla

et al.

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(1)

Published: Jan. 1, 2025

ABSTRACT Manta and devil rays are a diverse group of globally endangered elasmobranchs with complicated taxonomic history. The emergence genomic techniques has significantly improved our understanding species units in the group, yet there is one ray for which uncertainty remains. Mobula rochebrunei (Vaillant, 1879), pygmy inhabiting tropical waters eastern Atlantic, was recently synonymised hypostoma (Bancroft, 1831), its western Atlantic counterpart. However, since have been no sightings West Central Africa several decades, revision based on limited data, further investigation recommended. A dedicated monitoring effort Cameroon led to rare discovery three rays, providing unique opportunity build recent work. We use combination MinION sequencing morphometric analysis provide confirmation that both sides constitute same species. Crucially, work highlights persistence despite concerns disappearance emphasises need urgent conservation action avoid local extinction.

Language: Английский

Citations

0
Population structure and genetic diversity of the Critically Endangered bowmouth guitarfish (Rhina ancylostomus) in the Northwest Indian Ocean DOI Creative Commons

Marja J. Kipperman,

Rima W. Jabado,

Alifa Banthe Haque

et al.

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

Published: March 16, 2024

Abstract The bowmouth guitarfish ( Rhina ancylostomus ) is a unique and relatively understudied species of wedgefish with distribution spanning the Indo-Pacific Oceans. Due to targeted bycatch fisheries, this experiencing serious declines across its range. It now considered among most threatened elasmobranch. Despite this, species-specific management limited, particularly around primary fishing hotspots. This in part due knowing very little about fundamental population processes. Here, we combine mitochondrial single nucleotide polymorphism (SNP) data carry out first genetic assessment R. Northwest Indian Ocean. We find evidence for structure species’ northwest range that best explained by dispersal constraints therefore emphasises importance habitat connectivity. also uncover cline variation from east west sampling identify regions potential need heightened protection. In doing so, our study provides baseline information support conservation highlights value genomic elasmobranch conservation.

Language: Английский

Citations

0
Sustained Fishing Threatens Globally Protected Species: Insights from Digital Catch and Genomic Data DOI Creative Commons
Iris Segura, Christopher Moore, Michael McCoy

et al.

Global Ecology and Conservation, Journal Year: 2024, Volume and Issue: unknown, P. e03337 - e03337

Published: Dec. 1, 2024

Language: Английский

Citations

0
Age, growth, and intrinsic sensitivity of Endangered Spinetail Devil Ray (Mobula mobular) and Bentfin Devil Ray (M. thurstoni) in the Indian Ocean DOI Creative Commons
Ellen Barrowclift, Andrew J. Temple, Sebastián A. Pardo

et al.

Marine Biology, Journal Year: 2024, Volume and Issue: 172(2)

Published: Dec. 30, 2024

Devil rays (Mobula spp.) are caught in fisheries across the Indian Ocean, with reports of significant recent declines catch and sightings. Globally, few populations studied have extremely low population growth rates due to fecundity long reproductive cycles, making them highly vulnerable overfishing. To allow for assessment current sustainability devil ray we provide estimates age using caudal vertebrae; somatic a Bayesian, multi-model approach; maximum intrinsic rate increase (r max ); fishing mortality Endangered Spinetail Ray mobular) Bentfin (M. thurstoni) sampled from small-scale Indonesia, Kenya, Pakistan. The oldest individuals (n = 79) 59) were 17.5 six years, respectively. Both species had relatively coefficients (k 0.05 g 0.19 year-1, respectively), von Bertalanffy logistic models providing best fitting models, r (0.109 0.107 respectively) indicating that they sensitive overexploitation. Fishing F (0.16 0.18 higher than exploitation ratio E (0.77 0.80, an optimum value 0.5 biological both species, suggesting catches unsustainable. We demonstrate approach assess data-poor apply this two Ocean species. results highlight urgent need better management actions reduce all prevent extinction aid recovery. online version contains supplementary material available at 10.1007/s00227-024-04564-6.

Language: Английский

Citations

0