Results 11 to 20 of about 1,692 (159)

Quantifying the behavioural consequences of shark ecotourism [PDF]

Scientific Reports, 2023
Shark populations globally are facing catastrophic declines. Ecotourism has been posited as a potential solution to many of the issues facing shark conservation, yet increasingly studies suggest that such activity may negatively influence aspects of ...
Joel H. Gayford, William D. Pearse, Rafael De La Parra Venegas, Darren A. Whitehead   +3 more
doaj   +2 more sources

Effects of protection on large-bodied reef fishes in the western Indian Ocean. [PDF]

Conserv Biol
Abstract Predatory and large‐bodied coral reef fishes have fundamental roles in the functioning and biodiversity of coral reef ecosystems, but their populations are declining, largely due to overexploitation in fisheries. These fishes include sharks, groupers, Humphead wrasse (Cheilinus undulatus), and Green Humphead parrotfish (Bolbometopon muricatum).
Samoilys M, Osuka KE, Roche R, Koldewey H, Chabanet P.   +4 more
europepmc   +2 more sources

Key drivers of at-vessel mortality in demersal sharks. [PDF]

Conserv Biol
Abstract Chondrichthyans are highly vulnerable to fisheries overexploitation, and postcapture mortality poses a significant threat to most species. Global bycatch mitigation guidelines recommend adopting hierarchical decision‐making approaches tailored to species‐specific vulnerabilities and socioeconomic and regulatory contexts.
Ruiz-García D, Barría C, Raga JA, March D.   +3 more
europepmc   +2 more sources

Mitochondrial DNA patterns describe the evolutionary history of the bonnethead shark Sphyrna tiburo (Linneus 1758) complex in the western Atlantic Ocean. [PDF]

J Fish Biol
Abstract The apparent lack of physical barriers in the marine realm has created the conception that many groups have a constant gene flow. However, changes in ocean circulation patterns, glacial cycles, temperature, and salinity gradients are responsible for vicariant events in many fish species, including sharks.
Ochoa-Zavala M, Mar-Silva AF, Pérez-Rodríguez R, Palacios-Barreto P, Adams DH, Blanco-Parra MDP, Díaz-Jaimes P.   +6 more
europepmc   +2 more sources

Vulnerability of tropical fish communities across depth in the central Indian Ocean. [PDF]

Conserv Biol
Abstract Coral reefs and their fish communities below scuba diving depth (>30 m), in mesophotic coral ecosystems (MCEs) (∼30–150 m), in rariphotic (150–300 m), and in upper bathyal waters (300–500 m) are often underexplored, especially in the Indian Ocean.
Stefanoudis PV, de Villiers NM, Afzal MS, Amir H, Amjad F, Hashim AS, Jauharee AR, Palmer R, Rogers AD, Shimal M, Naeem S, Ahusan M, Woodall LC.   +12 more
europepmc   +2 more sources

Captura de tiburones en la región noroccidental de Cuba

Latin American Journal of Aquatic Research, 2014
Los tiburones han sido una importante fuente de alimento e ingresos en Cuba. A pesar de esto, es muy escasa la información sobre este grupo y, en las últimas décadas, no han sido objeto de una investigación organizada.
Consuelo Aguilar, Gaspar González-Sansón, Robert Hueter, Eloisa Rojas, Yureidy Cabrera, Alejandra Briones, Raidel Borroto, Aracely Hernández, Pamela Baker   +8 more
doaj   +3 more sources

Shearing Tooth Morphology May Allow Sharks to Access Higher Trophic Levels at Smaller Sizes. [PDF]

Ecol Evol
Predator morphology imposes limitations on prey selection due to biomechanical constraints, making some prey functionally inaccessible and thereby constraining predator trophic niches. We assessed how two key components of trophic morphology—tooth shape and body size—affect prey selectivity and trophic niche in two sympatric sharks with contrasting ...
Riverón S, Raoult V, Slip DJ, Mas F, Laporta M, Pereyra I, Silveira S, Harcourt RG.   +7 more
europepmc   +2 more sources

Lessons from a Rubik's Cube to solve the biodiversity crisis. [PDF]

Conserv Biol
Abstract Global biodiversity is facing unprecedented pressures, calling into question the effectiveness of existing governance systems aimed at halting extinctions. Renewed hope arose with the recent Conference of the Parties (COP) to the Convention on Biological Diversity (COP15 December 2022) and the Convention on International Trade in Endangered ...
Sequeira AMM, Techera EJE.
europepmc   +2 more sources

APORTES A LA BIOLOGÍA DE TIBURONES Y RAYAS DEMERSALES EN LA REGIÓN NORTE DEL CARIBE COLOMBIANO [PDF]

Acta Biológica Colombiana, 2008
El presente estudio es una contribución al conocimiento biológico de los peces cartilaginosos en la región norte del Caribe colombiano. Los ejemplares examinados se capturaron con una red demersal, se determinó su peso, longitud total y estado de madurez
Fabian Moreno, Kelly Acevedo, Jorge Paramo   +2 more
doaj   +1 more source

Evaluation of staining techniques for the observation of growth bands in tropical elasmobranch vertebrae

Scientia Marina, 2020
The aim of this study was to assess the suitability of different vertebrae staining techniques for the visualization and counting of growth bands in tropical species of batoids (Narcine leoparda, Urotrygon aspidura, Hypanus longus, Potamotrygon ...
José G. Pérez-Rojas, Katherine Torres-Palacios, Amalia Uribe, Andrés F. Navia, Paola A. Mejía-Falla   +4 more
doaj   +1 more source