Home » Archives
Improved detection sensitivity using an optimal eDNA preservation and extraction workflow and its application to threatened sawfishes
Improved detection sensitivity using an optimal eDNA preservation and extraction workflow and its application to threatened sawfishes Madalyn K. Cooper, Roger Huerlimann, Richard C. Edmunds, Alyssa M. Budd, Agnès Le Port, Peter M. Kyne, Dean R. Jerry, Colin A. Simpfendorfer ABSTRACT: Pressures on coastal ecosystems are increasing and aquatic species that are restricted to these
Large sharks exhibit varying behavioral responses to major hurricanes
Large sharks exhibit varying behavioral responses to major hurricanes L.F.G. Gutowsky, James Rider, R.P.Roemer, A.J. Gallagher, M.R. Heithause, S.J. Cooke, N. Hammerschlag ABSTRACT: Under global climate change, storm events are predicted to increase in strength and frequency. Although aquatic animals can be affected by acute natural disturbances, information on the immediate consequences of these weather
Significant differences in trophic niches of smooth hammerhead
Stable isotope and fatty acid analyses reveal significant differences in trophic niches of smooth hammerhead Sphyrna zygaena (Carcharhiniformes) among three nursery areas in northern Humboldt Current System Eduardo Segura-Cobeña, Joanna Alfaro-Shigueto, Jeffrey Mangel, Angel Urzua, Konrad Górski ABSTRACT: Fishery pressure on nursery areas of smooth hammerhead in northern Peruvian coast have become a serious threat
Annual abundance and population growth rates of white sharks off central California
Estimates of regional annual abundance and population growth rates of white sharks off central California Paul E. Kanive, Jay J. Rotella, Taylor K. Chapple, Scot D. Anderson, Timothy D. White, Barbara A. Block, Salvador J. Jorgensen ABSTRACT: Determining population trends is critical for evaluating management actions and prioritizing species protections. In this study, we used
Sightings trends and behaviour of manta rays in Fernando de Noronha Archipelago, Brazil
Sightings trends and behaviour of manta rays in Fernando de Noronha Archipelago, Brazil Nayara Bucair, Stephanie K. Venables, Ana Paula Balboni, Andrea D. Marshall ABSTRACT: Despite substantial progress in mobulid research over the past decade, knowledge gaps in manta ray ecology and behaviour remain, particularly in the South Atlantic Ocean. Opportunistic photographic and video records
Shark conservation and blanket bans in the eastern Pacific Ocean
Shark conservation and blanket bans in the eastern Pacific Ocean Gustavo A. Castellanos‐Galindo, Pilar Herrón, Andrés F. Navia, Hollie Booth ABSTRACT: Sharks are one of the most threatened marine animals, with fishing identified as the prime human activity responsible for population declines. The tropical eastern Pacific, a biogeographic region spanning the coastal areas from Mexico
Association behavior between sand tiger sharks and round scad is driven by mesopredators
Association behavior between sand tiger sharks and round scad is driven by mesopredators Nicholas C. Coleman, Erin J. Burge ABSTRACT: In marine systems, behaviorally-mediated indirect interactions between prey, mesopredators, and higher trophic-level, large predators are less commonly investigated than other ecologic interactions, likely because of inherent difficulties associated with making observations. Underwater videos (n = 216) from
Effects of food provisioning on the daily ration and dive site use of great hammerhead sharks
Effects of food provisioning on the daily ration and dive site use of great hammerhead sharks, Sphyrna mokarran Vital Heim, Félicie Dhellemmes, Matthew J. Smukall, Samuel H. Gruber, Tristan L. Guttridge ABSTRACT: Wildlife provisioning is popular, economically valuable and a rapidly growing part of marine tourism, with great potential to benefit conservation. However, it remains
Telomere Length in the Deep-Sea Shark, Etmopterus granulosus
An Exploratory Study of Telomere Length in the Deep-Sea Shark, Etmopterus granulosus Melissa C. Nehmens, Rebecca M. Varney, Alexis M. Janosik, David A. Ebert ABSTRACT: The history of elasmobranch ageing highlights the difficulty of age estimation in animals lacking ossified structures. Ageing techniques are numerous, yet all are limited by difficulties of validation and verification
Foraging depth depicts resource partitioning and contamination level in a pelagic shark assemblage
Foraging depth depicts resource partitioning and contamination level in a pelagic shark assemblage: Insights from mercury stable isotopes Lucien Besnard, Gaël Le Croizier, Felipe Galván-Magaña, David Point, Edouard Kraffe, James Ketchum, Raul Octavio Martinez Rincon, Gauthier Schaal ABSTRACT: The decline of shark populations in the world ocean is affecting ecosystem structure and function in an
Tiger shark feeding on sirenian
Tiger shark feeding on sirenian – first fossil evidence from the middle Miocene of the Styrian Basin (Austria) Iris Feichtinger, Ingomar Fritz & Ursula B. Göhlich ABSTRACT: Based on a shark-bitten partial skeleton of an immature sirenian (Metaxytherium cf. medium) from the middle Miocene of the Styrian Basin (Austria), we report on the oldest predator–prey
Evolution, diversity, and disparity of the tiger shark lineage Galeocerdo
Evolution, diversity, and disparity of the tiger shark lineage Galeocerdo in deep time Julia Türtscher, Faviel A. López-Romero, Patrick L. Jambura, René Kindlimann, David J. Ward, Jürgen Kriwet ABSTRACT: Sharks have a long and rich fossil record that consists predominantly of isolated teeth due to the poorly mineralized cartilaginous skeleton. Tiger sharks (Galeocerdo), which represent
Fine‐scale oceanographic drivers of reef manta ray visitation patterns at a feeding aggregation site
Fine‐scale oceanographic drivers of reef manta ray (Mobula alfredi) visitation patterns at a feeding aggregation site Joanna L. Harris, Phil Hosegood, Edward Robinson, Clare B. Embling, Simon Hilbourne, Guy M. W. Stevens ABSTRACT: Globally, reef manta rays (Mobula alfredi) are in decline and are particularly vulnerable to exploitation and disturbance at aggregation sites. Here, passive
Notoraja hesperindica sp. nov., a new deep-sea softnose skate
Notoraja hesperindica sp. nov., a new colorful deep-sea softnose skate (Elasmobranchii, Rajiformes, Arhynchobatidae) and first generic record from the western Indian Ocean Simon Weigmann, Bernard Séret, Matthias F. W. Stehmann ABSTRACT: A new deep-sea softnose skate, Notoraja hesperindica, is described based on six specimens caught in 1230–1600 m depths off southern Mozambique and northwestern Madagascar
Regional movements of satellite‐tagged whale sharks in the Gulf of Aden
Regional movements of satellite‐tagged whale sharks Rhincodon typus in the Gulf of Aden Samantha Andrzejaczek, Michel Vély, Daniel Jouannet, David Rowat, Sabrina Fossette ABSTRACT: To gain insight into whale shark (Rhincodon typus) movement patterns in the Western Indian Ocean, we deployed eight pop‐up satellite tags at an aggregation site in the Arta Bay region of