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Response of small sharks to nonlinear internal waves
Response of small sharks to nonlinear internal waves Jesús Pineda, Sally Rouse, Victoria Starczak, Karl Helfrich, David Wiley ABSTRACT: Plankton and nekton may respond passively or actively to large‐amplitude, nonlinear internal waves (NLIW), with periods and wavelengths on the order of minutes and hundreds of meters, and the NLIW can cause direct or indirect changes
Evidence for non-random co-occurrences in a white shark aggregation
Evidence for non-random co-occurrences in a white shark aggregation Adam Schilds, Johann Mourier, Charlie Huveneers, Leila Nazimi, Andrew Fox, Stephan T. Leu ABSTRACT: Groups or aggregations of animals can result from individuals being attracted to a common resource or because of synchronised patterns of daily or seasonal activity. Although mostly solitary throughout its distribution, white
Patterns in abundance and size of sharks in northwestern Australia
Patterns in abundance and size of sharks in northwestern Australia: cause for optimism Matias Braccini, Brett Molony, Nick Blay ABSTRACT: Reliable information for population assessments is rare for sharks. We quantified patterns in catch rates and mean size for numerous tropical and subtropical species from 15 years of fishery-independent surveys (2002–2017) in northwestern Australia. This
Golfo Dulce: critical habitat and nursery area for juvenile scalloped hammerhead sharks
Golfo Dulce: critical habitat and nursery area for juvenile scalloped hammerhead sharks Sphyrna lewini in the Eastern Tropical Pacific Seascape Zanella I, Lopez-Garro A, Cure K ABSTRACT: Scalloped hammerhead sharks Sphyrna lewini are endangered and threatened by fisheries. Along the Eastern Tropical Pacific Seascape (ETPS) adults are protected from fishing near oceanic islands, but juveniles
The size of the megatooth shark revisited
The size of the megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), revisited Kenshu Shimada ABSTRACT: Otodus megalodon (Lamniformes: Otodontidae) is a gigantic late Neogene shark that lived nearly worldwide in tropical-temperate regions. Its gigantic teeth have captivated imaginations of the scientific community and general public alike, where the most commonly cited maximum size range of O.
A biometric for shark dorsal fins based on boundary descriptor matching
A biometric for shark dorsal fins based on boundary descriptor matching Taina Coleman and Jucheol Moon ABSTRACT: Recent progress in animal biometrics has revolutionized wildlife research. Cutting edge techniques allow researchers to track individuals through noninvasive methods of recognition that are not only more reliable, but also applicable to large, hard-to-find, and otherwise difficult to
The Sandy Zebra Shark: A New Color Morph of the Zebra Shark
The Sandy Zebra Shark: A New Color Morph of the Zebra Shark Stegostoma tigrinum, with a Redescription of the Species and a Revision of Its Nomenclature Rikke Beckmann Dahl, Eva Egelyng Sigsgaard, Gorret Mwangi, Philip Francis Thomsen, René Dalsgaard Jørgensen, Felipe de Oliveira Torquato, Lars Olsen, Peter Rask Møller ABSTRACT: The Zebra Shark, in recent
Report of a new shark attack on a surfer in Uruguay
REPORTE SOBRE UN NUEVO ATAQUE DE TIBURON (Elasmobranchii: Carcharhinidae) A UN SURFISTA EN COSTAS DE URUGUAY Pablo Nuñez, Carlos Prigioni, Alvaro Sappa ABSTRACT: A new shark attack (Carcharhinidae) is reported for the coasts of the department of Maldonado, Uruguay. The circumstances of the accident are described and the available information on the attack and the
On the Presence of White Shark, Carcharodon carcharias, in Uruguay
El Tiburón blanco (Carcharodon carcharias) (Lamniformes: Lamnidae) en el Uruguay C. Prigioni, A. Sappa, F. Leon, P. Nuñez ABSTRACT: A jaw of Carcharodon carcharias is reported, obtained in the 40s by fishermen from Valizas, Rocha. Bibliographic, oral and photographic references of their presence in Uruguayan waters are gathered and the causes of their apparent occasional
Queensland Shark Control Program – Review of alternative approaches
The Queensland Shark Control Program: Review of alternative approaches report prepared by Cardno was released on 3 October 2019. The report details an assessment of a range of alternative approaches to shark safety and recommends what may be appropriate for trial in Queensland. By Cardno (NSW/ACT) Pty LtdPrepared for Qld Dept. Agriculture and Fisheries PDF-DOWNLOAD
Seasonal changes in basking shark vertical space use in the north-east Atlantic
Seasonal changes in basking shark vertical space use in the north-east Atlantic P. D. Doherty, J. M. Baxter, B. J. Godley, R. T. Graham, G. Hall, J. Hall, L. A. Hawkes, S. M. Henderson, L. Johnson, C. Speedie, M. J. Witt ABSTRACT: Mobile marine species can exhibit vast movements both horizontally and vertically. Spatial analysis
DNA analysis of elasmobranch products originating from Bangladesh reveals unregulated elasmobranch fishery
DNA analysis of elasmobranch products originating from Bangladesh reveals unregulated elasmobranch fishery and trade on species of global conservation concern Alifa Bintha Haque, Sudipta Arka Das, Aparna Riti Biswas ABSTRACT: Trade involving elasmobranch products in Bangladesh is a four-decade-long practice in large scale and there is little understanding of its impact on species composition, population,
Climate cooling and clade competition likely drove the decline of lamniform sharks
Climate cooling and clade competition likely drove the decline of lamniform sharks Fabien L. Condamine, Jules Romieu, Guillaume Guinot ABSTRACT: Understanding heterogeneity in species richness between closely related clades is a key research question in ecology and evolutionary biology. Multiple hypotheses have been proposed to interpret such diversity contrasts across the tree of life, with
The neglected complexities of shark fisheries
The neglected complexities of shark fisheries, and priorities for holistic risk-based management Hollie Booth, Dale Squires, E.J. Milner-Gulland ABSTRACT: Sharks and their cartilaginous relatives (Class Chondrichthyes, herein ‘sharks’) are one of the world’s most threatened species groups. Their slow life history traits and vulnerability to capture make them particularly susceptible to overfishing, and they are
Threatened shark species in pet food and beauty care products
Genetic identification of threatened shark species in pet food and beauty care products Diego Cardeñosa ABSTRACT: Contemporary global demand for shark commodities such as fins, meat, and liver oil, is arguably the main driver of shark overexploitation trends observed in the last three decades. Shark are most commonly traded for their fins to be used in