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White Sharks Scavenging on Whales and Its Role in Further Shaping the Ecology of an Apex Predator
Published on 09. April 2013 White Sharks (Carcharodon carcharias) Scavenging on Whales and Its Potential Role in Further Shaping the Ecology of an Apex Predator Fallows C, Gallagher AJ, Hammerschlag N ABSTRACT: Scavenging, a result of a temporary pulse of resources, occurs in virtually all ecosystems containing carnivores, and is an important energy transfer pathway
MMO Guidance on the protection of sharks, skates and rays
Guidance on shark, skate and ray species protected by fisheries and wildlife legislation By the Marine Management Organisation April 2013 We have produced guidance for commercial and recreational fishermen who may catch shark, skate and ray species (collectively known as elasmobranchs), and markets, merchants or any premises who may handle these species. It provides details
Sexual dimorphisms of the Ampullae of Lorenzini in the lesser-spotted catshark
Published in May 2013 A study into the sexual dimorphisms of the Ampullae of Lorenzini in the lesser-spotted catshark, Scyliorhinus canicula (Linnaeus, 1758) Neil Crooks, Colin P. Waring ABSTRACT: The Ampullae of Lorenzini can vary in their size, shape and distribution patterns among elasmobranch species. However, no study has compared the ampullary characteristics between the
The influence of gummy sharks on observed fish assemblage structure
Published in April 2013 The influence of gummy sharks, Mustelus antarcticus, on observed fish assemblage structure J. Klages, A. Broad, B. P. Kelaher, A. R. Davis ABSTRACT: Large predatory fish that alter the behaviour of smaller species may affect visual estimates of abundance by making organisms more or less difficult to observe and quantify. To
First record of a bicephalic embryo of smalltail shark
Published on 05. April 2013 First record of a bicephalic embryo of smalltail shark Carcharhinus porosus L. A. Muñoz-Osorio, P. A. Mejía-Falla, A. F. Navia ABSTRACT: This study reports the first bicephalic embryo of smalltail shark Carcharhinus porosus, which was removed from a pregnant female in coastal waters of the tropical eastern Pacific Ocean. The
Two-year migration of adult female white sharks reveals widely separated nursery areas
Two-year migration of adult female white sharks ( Carcharodon carcharias ) reveals widely separated nursery areas and conservation concerns. Michael L. Domeier and Nicole Nasby-Lucas ABSTRACT: Background: Satellite tagging programs have provided detailed information about the migratory patterns of northeastern Pacific white sharks, revealing a seasonal migration between a vast offshore region and coastal aggregation
Shark Tooth Weapons Reflect Shifting Baselines in Central Pacific Predator Assemblies
Published on 03. April 2013 Shark Tooth Weapons from the 19th Century Reflect Shifting Baselines in Central Pacific Predator Assemblies Joshua Drew, Christopher Philipp, Mark W. Westneat ABSTRACT: The reefs surrounding the Gilbert Islands (Republic of Kiribati, Central Pacific), like many throughout the world, have undergone a period of rapid and intensive environmental perturbation over
Age, growth and reproductive biology of the spot-tail shark and the Australian blacktip shark
Published online on 26. March 2013 Age, growth and reproductive biology of the spot-tail shark, Carcharhinus sorrah, and the Australian blacktip shark, C. tilstoni, from the Great Barrier Reef World Heritage Area, north-eastern Australia Alastair V. Harry, Andrew J. Tobin and Colin A. Simpfendorfer ABSTRACT: Understanding the life history of an exploited fish species is
First record of dicephalia in a bull shark foetus from the Gulf of Mexico
Published online on 25. March 2013 First record of dicephalia in a bull shark Carcharhinus leucas (Chondrichthyes: Carcharhinidae) foetus from the Gulf of Mexico, U.S.A. C. M. Wagner, P. H. Rice, A. P. Pease ABSTRACT: The first recorded incidence of dicephalia in a bull shark Carcharhinus leucas is reported from a foetus collected by a
Trophic Interactions and Distribution of Some Squaliforme Sharks
Published on 25. March 2013 Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias Matthew R. Dunn, Darren W. Stevens, Jeffrey S. Forman, Amelia Connell ABSTRACT: Squaliforme sharks are a common but relatively vulnerable bycatch in many deep water fisheries. Eleven species of squaliforme shark are
Assessment Technique to Assist Management of the White Shark Cage Dive Industry
A Rapid Assessment Technique to Assist Management of the White Shark (Carcharodon Carcharias) Cage Dive Industry, South Australia Russell Bradford and Rachel Robbins ABSTRACT: Port Lincoln, South Australia is the departure port for the only white shark, Carcharodon carcharias, cage dive industry in Australia. Established in the early 1960’s as a niche tourism venture, the
Feeding requirements of white sharks may be higher than thought
Published on 18. March 2013 Feeding requirements of white sharks may be higher than originally thought J. M. Semmens, N. L. Payne, C. Huveneers, D. W. Sims & B. D. Bruce ABSTRACT: Quantifying the energy requirements of animals in nature is critical for understanding physiological, behavioural, and ecosystem ecology; however, for difficult-to-study species such as
Heavy metal concentrations of two highly migratory sharks
Published on 18. March 2013 Heavy metal concentrations of two highly migratory sharks ( Prionace glauca and Isurus oxyrinchus ) in the southeastern Pacific waters: comments on public health and conservation Lopez, S. A. Abarca, N. L. and Meléndez R. ABSTRACT: Despite the importance of sharks in structuring the marine food web, their biomass is
Frequency of Multiple Paternity in Gummy Shark and Rig
Published online on 15. March 2013 Frequency of Multiple Paternity in Gummy Shark, Mustelus antarcticus, and Rig, Mustelus lenticulatus, and the Implications of Mate Encounter Rate, Postcopulatory Influences, and Reproductive Mode Jessica J. Boomer, Robert G. Harcourt, Malcolm P. Francis, Terence I. Walker, Juan Matias Braccini and Adam J. Stow ABSTRACT: Elasmobranchs (sharks and rays)
Generalized Linear Models and Generalized Estimation Equations to model at-haulback mortality of blue sharks
Published online on 14. March 2013 Application of Generalized Linear Models and Generalized Estimation Equations to model at-haulback mortality of blue sharks captured in a pelagic longline fishery in the Atlantic Ocean Rui Coelho, Paulo Infante, Miguel N. Santos ABSTRACT: At-haulback mortality of blue shark (Prionace glauca) captured by the Portuguese pelagic longline fishery targeting