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The evolution and development of shark denticles
Teeth outside the mouth: The evolution and development of shark denticles Rory L. Cooper, Ella F. Nicklin, Liam J. Rasch, Gareth J. Fraser ABSTRACT: Vertebrate skin appendages are incredibly diverse. This diversity, which includes structures such as scales, feathers, and hair, likely evolved from a shared anatomical placode, suggesting broad conservation of the early development
Blue shark occurrence and relative abundance in the western South Atlantic Ocean influenced by spatiotemporal variability, environmental variables, and oceanographic processes
Blue shark (Prionace glauca) occurrence and relative abundance in the western South Atlantic Ocean influenced by spatiotemporal variability, environmental variables, and oceanographic processes Maria Rondon-Medicci, Luis G. Cardoso, Bruno Mourato, L. Dalla Rosa ABSTRACT: The aim of this study was to evaluate spatiotemporal patterns in the distribution and relative abundance of blue sharks and their
Literature, social media and questionnaire surveys identify relevant conservation areas for Carcharhinus species in the Mediterranean Sea
Literature, social media and questionnaire surveys identify relevant conservation areas for Carcharhinus species in the Mediterranean Sea Carlo Cattano, Antonio Calò, Giorgio Aglieri, Petra Cattano, Manfredi Di Lorenzo, Desirèe Grancagnolo, Debora Lanzarone, Elena Principato, Davide Spatafora, Gabriele Turco, Marco Milazzo ABSTRACT: Sharks support ecosystems’ health, but their populations are facing severe declines worldwide. Knowledge gaps
New records of elasmobranchs from the southwestern Gulf of Mexico
New records of elasmobranchs (Vertebrata: Elasmobranchii) from the southwestern Gulf of Mexico Luis Fernando Del Moral-Flores, María Belén González-Pérez, Armando T. Wakida-Kusunoki, Adriana Martínez-Guevara, Guadalupe del Rosario Vleeshower-Hernández, Nissi Mariane Rodríguez-Rentería ABSTRACT: We present information about new records of 11 species of chondrichthyans in the southern Gulf of Mexico, adding information about new specimens and occurrence of the species in Mexican
First evidence of population genetic structure of the deep-water blackmouth catshark
First evidence of population genetic structure of the deep-water blackmouth catshark Galeus melastomus Rafinesque, 1810 Diego M. Vazquez, Cynthia A. Awruch, Luis O. Lucifora, Juan M. Díaz de Astarloa, Ezequiel Mabragaña ABSTRACT: Among the main measures adopted to reduce anthropogenic impacts on elasmobranch communities, understanding the ecology of deep-sea sharks is of paramount importance, especially
Embryonic development timeline in skates
Embryonic development timeline in skates (Chondrichthyes: Rajiformes): Sympterygia acuta as the first case study in the family Arhynchobatidae Diego M. Vazquez, Cynthia A. Awruch, Luis O. Lucifora, Juan M. Díaz de Astarloa, Ezequiel Mabragaña ABSTRACT: Oviparous elasmobranch embryos (Chondrichthyes) have been the focus of several embryological studies; they are useful models for studying early ontogeny
Interspecific foraging association of a nurse shark with bottlenose dolphins
Interspecific foraging association of a nurse shark (Ginglymostoma cirratum) with bottlenose dolphins (Tursiops truncatus) Connor F. White, Harold. L. Pratt Jr., Theo C. Pratt, Nicholas M. Whitney ABSTRACT: Animals sometimes forage in mixed species groups, where an individual of a “follower” species actively trails a foraging individual of another “nuclear” species to benefit from the
Efficacy of a novel shark bycatch mitigation device in a tuna longline fishery
Efficacy of a novel shark bycatch mitigation device in a tuna longline fishery Philip D. Doherty, Robert Enever, Lucy C.M. Omeyer, Lydia Tivenan, Grant Course, Guy Pasco, David Thomas, Ben Sullivan, Ben Kibel, Pete Kibel, Brendan J. Godley SUMMARY: Elasmobranchs (sharks, rays, and skates) are caught throughout fisheries globally, leading to over one-third of species
Molecular identification of shark species commercialised in the ‘17 de Diciembre’ market
Molecular identification of shark species commercialised in the ‘17 de Diciembre’ market, Santo Domingo de los Tsáchilas-Ecuador Ana Belén Manzanillas Castro, Camila Acosta-López ABSTRACT: This is the first study to determine the main shark species being sold in the ‘17 de Diciembre’ market, in Santo Domingo de Los Tsáchilas, Ecuador. A total of 150 samples
Demographic Analysis of Shortfin Mako Shark in the South Pacific Ocean
Demographic Analysis of Shortfin Mako Shark (Isurus oxyrinchus) in the South Pacific Ocean Hoang Huy Huynh, Chun-Yi Hung, Wen-Pei Tsai ABSTRACT: The shortfin mako shark (Isurus oxyrinchus) demonstrates low productivity and is thus relatively sensitive to fishing. Natural mortality (M) and fishing mortality (F) data are critical to determine their population dynamics. However, catch and
Ocean depth–temperature profiles for operational oceanography from a shark-borne transmitter
Ocean depth–temperature profiles for operational oceanography from a shark-borne transmitter Kim Holland, Carl Meyer, James Potemra, Melinda Holland ABSTRACT: Background Many regions of the ocean are under-sampled in terms of their biology and physical structure. Increasingly sophisticated animal-borne electronic tags are capable of measuring and transmitting in situ environmental data such as ocean temperature–depth profiles.
Escape response kinematics in two species of tropical shark
Escape response kinematics in two species of tropical shark: short escape latencies and high turning performance José E. Trujillo, Ian Bouyoucos, William J. Rayment, Paolo Domenici, Serge Planes, Jodie L. Rummer, Bridie J. M. Allan ABSTRACT: Accelerative manoeuvres, such as fast-starts, are crucial for fish to avoid predation. Escape responses are fast-starts that include fundamental
Smart sharks: a review of chondrichthyan cognition
Smart sharks: a review of chondrichthyan cognition Culum Brown, Vera Schluessel ABSTRACT: 450 million years of evolution have given chondrichthyans (sharks, rays and allies) ample time to adapt perfectly to their respective everyday life challenges and cognitive abilities have played an important part in that process. The diversity of niches that sharks and rays occupy
A new sawtail catshark from the Philippines
Galeus friedrichi (Carcharhiniformes: Pentanchidae), a new sawtail catshark from the Philippines Ebert, David A.; Jang, Jessica J. ABSTRACT: A new species of sawtail catshark, Galeus friedrichi n. sp., is described from the Philippines. The new species is separable from other western Pacific Galeus species by the absence of saddle or blotch markings, a large size,
Parthenogenesis in an elasmobranch in the presence of conspecific males
Parthenogenesis in an elasmobranch in the presence of conspecific males K.A. Feldheim, J. Dubach, L. Watson ABSTRACT: Parthenogenesis has been observed in several elasmobranch species, primarily in public aquaria. The majority of cases of parthenogenesis have occurred either when females were held without males or once a male was removed from a female’s habitat. Here