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Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery
Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery Nicholas M. Whitney, Karissa O. Lear, John J. Morris, Robert E. Hueter, John K. Carlson, Heather M. Marshall ABSTRACT: Bycatch mortality is a major factor contributing to shark population declines. Post-release mortality (PRM) is particularly difficult to quantify,
Secondary predation constrains DNA-based diet reconstruction in two threatened shark species
Secondary predation constrains DNA-based diet reconstruction in two threatened shark species Mark de Bruyn, Matteo Barbato, Joseph D. DiBattista, Matt K. Broadhurst ABSTRACT: Increasing fishing effort, including bycatch and discard practices, are impacting marine biodiversity, particularly among slow-to-reproduce taxa such as elasmobranchs, and specifically sharks. While some fisheries involving sharks are sustainably managed, collateral mortalities
Species-specific search strategies in sympatric apex predatory sharks
Comprehensive analytical approaches reveal species-specific search strategies in sympatric apex predatory sharks Hannah J. Calich, Jorge P. Rodríguez, Víctor M. Eguíluz, Neil Hammerschlag, Charitha Pattiaratchi, Carlos M. Duarte, Ana M. M. Sequeira ABSTRACT: Animals follow specific movement patterns and search strategies to maximize encounters with essential resources (e.g. prey, favourable habitat) while minimizing exposures to
The shark meat market threatens elasmobranchs in Brazil
Biodiversity on sale: The shark meat market threatens elasmobranchs in Brazil Marcelo Merten Cruz, Bruna Elenara Szynwelski, Thales R. Ochotorena de Freitas ABSTRACT: Elasmobranchs are apex predators that play a crucial role in marine ecosystems by regulating the dynamics of food webs, as well as connecting different trophic levels across habitats. The large-scale removal of
Length–weight relations of 46 uncommon sharks and rays in the Mediterranean Sea
Filling in knowledge gaps: Length–weight relations of 46 uncommon sharks and rays (Elasmobranchii) in the Mediterranean Sea Athanassios C. Tsikliras, Donna Dimarchopoulou ABSTRACT: Large sharks and rays are generally understudied in the Mediterranean Sea, thus leading to a knowledge gap of basic biological characteristics that are important in fisheries management and ecosystem modeling. Out of
Evaluating artisanal fishing of globally threatened sharks and rays in the Bay of Bengal, Bangladesh
Evaluating artisanal fishing of globally threatened sharks and rays in the Bay of Bengal, Bangladesh Alifa Bintha Haque, Rachel D. Cavanagh, Nathalie Seddon ABSTRACT: Sharks and rays are at risk of extinction globally. This reflects low resilience to increasing fishing pressure, exacerbated by habitat loss, climate change, increasing value in a trade and inadequate information
Distribution and Abundance of Coastal Elasmobranchs in Tenerife, Canary Islands
Distribution and Abundance of Coastal Elasmobranchs in Tenerife (Canary Islands, NE Atlantic Ocean) with Emphasis on the Bull Ray, Aetomylaeus bovinus Jorge Manuel Moreno Mendoza, Silvio E. Solleliet-Ferreira, R. Riera ABSTRACT: The current status of the elasmobranchs’ populations and distribution in the Canary Islands is uncertain. Here we investigate the abundance and distribution patterns of
Behavioural response of a whale shark during the passage of a typhoon
Behavioural response of a whale shark during the passage of a typhoon Itsumi Nakamura, Hiroyuki Tsuchida, Kazuki Tone, Kazuyoshi Komeyama, Akira Sasaki, Ryo Kawabe ABSTRACT: During a behavioural survey of a tagged whale shark (Rhincodon typus) conducted in 2019 in the waters off Kagoshima, Japan, a typhoon passed close to the area under surveillance. As
Numerical Abilities in Grey Bamboo Sharks and Ocellate River Stingrays
Counting on Numbers—Numerical Abilities in Grey Bamboo Sharks and Ocellate River Stingrays Nils Kreuter, Nele Christofzik, Carolin Niederbremer, Janik Bollé, Vera Schluessel ABSTRACT: Over the last decade, studies examining the cognitive abilities of fish have increased, using a broad range of approaches. One of the foci has been to test the ability of fish to
Overfishing drives over one-third of all sharks and rays toward a global extinction crisis
Overfishing drives over one-third of all sharks and rays toward a global extinction crisis Nicholas K. Dulvy, Nathan Pacoureau, Cassandra L. Rigby, Riley A. Pollom, Rima W. Jabado, David A. Ebert, Brittany Finucci, Caroline M. Pollock, Jessica Cheok, Danielle H. Derrick, Katelyn B. Herman, C. Samantha Sherman, Wade J. Van der Wright, Julia M. Lawson,
Environmental DNA reduces the phantom diversity of sharks and rays in turbid marine habitats
Seeing through sedimented waters: environmental DNA reduces the phantom diversity of sharks and rays in turbid marine habitats Yin Cheong Aden Ip, Jia Jin Marc Chang, Kelvin K P Lim, Zeehan Jaafar, Benjamin J Wainwright, Danwei Huang ABSTRACT: Background: Sharks and rays are some of the most threatened marine taxa due to the high levels
The Subtle Impacts of Tourist Provisioning on the Social Behavior of Tiger Sharks
Social Network Analysis Reveals the Subtle Impacts of Tourist Provisioning on the Social Behavior of a Generalist Marine Apex Predator Jacoby David M. P., Fairbairn Bethany S., Frazier Bryan S., Gallagher Austin J., Heithaus Michael R., Cooke Steven J., Hammerschlag Neil ABSTRACT: Shark dive ecotourism is a lucrative industry in many regions around the globe.
Differential horizontal migration patterns of two male salmon sharks tagged in the Bering Sea
Differential horizontal migration patterns of two male salmon sharks (Lamna ditropis) tagged in the Bering Sea Sabrina Garcia, Cindy A. Tribuzio, Andrew C. Seitz, Michael B. Courtney, Julie K. Nielsen, Jim M. Murphy, Dion S. Oxman ABSTRACT: Background The salmon shark (Lamna ditropis) is a widely distributed apex predator in the North Pacific Ocean. Many
Passive Prey Discrimination in Surface Predatory Behaviour of Bait-Attracted White Sharks from Gansbaai
Passive Prey Discrimination in Surface Predatory Behaviour of Bait-Attracted White Sharks from Gansbaai, South Africa Primo Micarelli, Federico Chieppa, Antonio Pacifico, Enrico Rabboni, Francesca Romana Reinero ABSTRACT: Between the years 2008 and 2013, six annual research expeditions were carried out at Dyer Island (Gansbaai, South Africa) to study the surface behaviour of white sharks in
Phylogeography and population genetics of the cryptic bonnethead shark Sphyrna aff. tiburo
Phylogeography and population genetics of the cryptic bonnethead shark Sphyrna aff. tiburo in Brazil and the Caribbean inferred from mitochondrial DNA markers Cindy Gonzalez, Bautisse Postaire, Rodrigo R Domingues, Kevin A Feldheim, Susana Caballero, Demian Chapman ABSTRACT: Resolving the identity, phylogeny, and distribution of cryptic species within species complexes is an essential precursor to management.