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DNA analysis of traded shark fins and mobulid gill plates reveals a high proportion of species of conservation concern
Published on 25. August 2017 DNA analysis of traded shark fins and mobulid gill plates reveals a high proportion of species of conservation concern Dirk Steinke, Andrea M. Bernard, Rebekah L. Horn, Paul Hilton, Robert Hanner & Mahmood S. Shivji ABSTRACT: Continuously increasing demand for plant and animal products causes unsustainable depletion of biological resources.
Evidence for systemic age underestimation in shark and ray ageing studies
Published on 23. August 2017 Evidence for systemic age underestimation in shark and ray ageing studies Alastair Varley Harry ABSTRACT: Numerous studies have now demonstrated that the most common method of ageing sharks and rays, counting growth zones on calcified structures, can underestimate true age. I reviewed bomb carbon dating (n = 15) and fluorochrome chemical marking
Residency and movement patterns of an apex predatory shark at the Galapagos Marine Reserve
Published on 22. August 2017 Residency and movement patterns of an apex predatory shark (Galeocerdo cuvier) at the Galapagos Marine Reserve David Acuña-Marrero, Adam N. H. Smith, Neil Hammerschlag, Alex Hearn, Marti J. Anderson, Hannah Calich, Matthew D. M. Pawley, Chris Fischer, Pelayo Salinas-de-León ABSTRACT: The potential effectiveness of marine protected areas (MPAs) as a
Shark bite injuries on three inshore dolphin species in tropical northwestern Australia
Published on 21. August 2017 Shark bite injuries on three inshore dolphin species in tropical northwestern Australia Felix Smith, Simon J. Allen, Lars Bejder, Alexander M. Brown ABSTRACT: Predation risk has a profound influence on the behavior of marine mammals, affecting grouping patterns and habitat use. Dolphins frequently bear evidence of shark bites, which can
A comparative morphological analysis of body and fin shape for eight shark species
Published on 19. August 2017 A comparative morphological analysis of body and fin shape for eight shark species Duncan J Irschick, Amy Fu, George Lauder, Cheryl Wilga, Chi-Yun Kuo, Neil Hammerschlag ABSTRACT: Sharks are diverse and ecologically important predators and are also highly varied in their biology and behaviour. Prior studies have posited basic relationships
Broad-scale movements of commercially important sharks
Published online on 18. August 2017 Acoustic monitoring reveals the broad-scale movements of commercially important sharks Matias Braccini, Kelly Rensing, Tim Langlois, Rory McAuley ABSTRACT: Information on broad-scale movements is required for spatial management and improved conservation of large marine predators. We studied the mobility of the 4 most commercially important shark species of Western
Shark conservation issues among users of a shark angling online forum
Published online on 12. August 2017 Fishing practices and representations of shark conservation issues among users of a land-based shark angling online forum David S. Shiffman, Catherine Macdonald, Harry Y. Ganz, Neil Hammerschlag ABSTRACT: Recreational fisheries can play a significant role in the population dynamics of threatened fish species, but have received much less research
Identification of ciguatoxins in a shark involved in a fatal food poisoning
Published on 15. August 2017 Identification of ciguatoxins in a shark involved in a fatal food poisoning in the Indian Ocean Jorge Diogène, Laia Reverté, Maria Rambla-Alegre, Vanessa del Río, Pablo de la Iglesia, Mònica Campàs, Oscar Palacios, Cintia Flores, Josep Caixach, Christian Ralijaona, Iony Razanajatovo, Agathe Pirog, Hélène Magalon, Nathalie Arnich & Jean Turquet
Contrasting complexity of adjacent habitats influences the strength of cascading predatory effects
Published on 12. August 2017 Contrasting complexity of adjacent habitats influences the strength of cascading predatory effects James E. Byers, Zachary C. Holmes, Jennafer C. Malek ABSTRACT: Although cascading effects of top predators can help structure communities, their influence may vary across habitats that differentially protect prey. Therefore, to understand how and to what degree
Abundance and size structure of a reef shark population within a marine reserve
Published on 03. August 2017 Abundance and size structure of a reef shark population w ithin a marine reserve has remained stable for more than a decade Mark E. Bond, Jasmine Valentin-Albanese, Elizabeth A. Babcock, Debra Abercrombie, Norlan F. Lamb, Ashbert Miranda, Ellen K. Pikitch, Demian D. Chapman ABSTRACT: Marine reserves, areas protected from exploitative
The trophic role of a large marine predator, the tiger shark
Published on 09 August 2017 The trophic role of a large marine predator, the tiger shark Galeocerdo cuvier Luciana C. Ferreira, Michele Thums, Michael R. Heithaus, Adam Barnett, Kátya G. Abrantes, Bonnie J. Holmes, Lara M. Zamora, Ashley J. Frisch, Julian G. Pepperell, Derek Burkholder, Jeremy Vaudo, Robert Nowicki, Jessica Meeuwig, Mark G. Meekan ABSTRACT:
Overfishing of an apex marine predator
Published online on 02. August 2017 Satellite telemetry reveals higher fishing mortality rates than previously estimated, suggesting overfishing of an apex marine predator Michael E. Byrne, Enric Cortés, Jeremy J. Vaudo, Guy C. McN. Harvey, Mark Sampson, Bradley M. Wetherbee, Mahmood Shivji ABSTRACT: Overfishing is a primary cause of population declines for many shark species
Occurrence of the whitetip reef shark at the Kermadec Islands
Published on 05. July 2017 Occurrence of the whitetip reef shark Triaenodon obesus at the Kermadec Islands, Southwest Pacific Ocean C. A. J. Duffy, N. D. Forrester, T. K. Gibson & S. Hathaway ABSTRACT: Four observations of what was probably a single vagrant adult female whitetip reef shark Triaenodon obesus were made at Raoul and
Population structure and connectivity of tiger sharks across the Indo-Pacific Ocean basin
Published on 05. July 2017 Population structure and connectivity of tiger sharks (Galeocerdo cuvier) across the Indo-Pacific Ocean basin Bonnie J. Holmes, Samuel M. Williams, Nicholas M. Otway, Einar E. Nielsen, Safia L. Maher, Mike B. Bennett, Jennifer R. Ovenden ABSTRACT: Population genetic structure using nine polymorphic nuclear microsatellite loci was assessed for the tiger
Feeding ecology of elasmobranch species in southeastern Brazil
Published on 03. Juli 2017 Feeding ecology of elasmobranch species in southeastern Brazil Alessandra F. Viana, Jean L. Valentin, Marcelo Vianna ABSTRACT: The feeding ecology of five elasmobranch species was studied on the southern coast of Rio de Janeiro, southwestern Atlantic Ocean. The specimens were caught with a trawl or bottom longline between January 2006