Results 1 to 10 of about 747 (175)

The biology and ecology of the Pacific sharpnose shark Rhizoprionodon longurio [PDF]

Ecology and Evolution, 2023
Amidst global declines in elasmobranch populations resulting predominantly from overfishing, the need to gather data regarding shark ecology is greater than ever.
Joel H. Gayford, Darren A. Whitehead
doaj   +3 more sources

First record of a neonate bluntnose sixgill shark (Hexanchus griseus) from Baja California Sur, Mexico [PDF]

Ecology and Evolution
The bluntnose sixgill shark (Hexanchus griseus) is a wide‐ranged deep‐water shark species found off continental and insular shelves. Despite its global distribution, little is known about the reproductive ecology of the species, particularly with regard ...
Darren A. Whitehead, Joel H. Gayford
doaj   +3 more sources

New record of Frilled shark Chlamydoselachus anguineus Garman, 1884 (Chondrichthyes: Hexanchiformes) in the South Pacific Ocean [PDF]

PeerJ
Frilled sharks are rarely observed and limited information is available regarding their life history. The global number of records for these sharks does not exceed 40, with most sightings reported in the Western Pacific Ocean.
Maria J. Indurain, Angel Mancilla, Leandro Brizuela, Carolina Vargas-Caro, Carlos Bustamante   +4 more
doaj   +3 more sources

Reconstructing historical catch trends of threatened sharks and rays based on fisher ecological knowledge. [PDF]

Conserv Biol
Abstract Small‐scale fisheries often lack historical shark and ray catch information, hampering their management. We reconstructed historical catch trends and current fishing pressure by combining local ecological knowledge, satellite‐based vessel counts, and a short‐term landing‐site survey.
Leurs G, Jabado RW, Camará A, Dos Santos L, Nonque DM, Zuidewind TJ, Barry I, Campredon P, Blaschke B, de Boer K, Hijner N, Olff H, Pontes SL, Regalla A, Walsh MB, Govers LL.   +15 more
europepmc   +2 more sources

Predictions of southern migration timing in coastal sharks under future ocean warming. [PDF]

Conserv Biol
Abstract Projected redistribution of marine species due to ocean warming may undermine current conservation efforts. Yet, there have been few studies on how ocean warming may alter migration timing. Across 5 years of acoustic telemetry data (2018–2022), we determined environmental drivers of southward migration timing for 6 migratory shark species from
Manz MH, Shipley ON, Cerrato RM, Hueter RE, Newton AL, Tyminski JP, Franks BR, Curtis TH, Fischer C, Zacharias JP, Scott C, Dunton KJ, Kneebone J, Peterson BJ, Scannell BJ, Dodd JF, Frisk MG.   +16 more
europepmc   +2 more sources

Effects of protection on large-bodied reef fishes in the western Indian Ocean. [PDF]

Conserv Biol
Abstract Predatory and large‐bodied coral reef fishes have fundamental roles in the functioning and biodiversity of coral reef ecosystems, but their populations are declining, largely due to overexploitation in fisheries. These fishes include sharks, groupers, Humphead wrasse (Cheilinus undulatus), and Green Humphead parrotfish (Bolbometopon muricatum).
Samoilys M, Osuka KE, Roche R, Koldewey H, Chabanet P.   +4 more
europepmc   +2 more sources

Linking extinction risk to the economic and nutritional value of sharks in small-scale fisheries. [PDF]

Conserv Biol
Abstract To achieve sustainable shark fisheries, it is key to understand not only the biological drivers and environmental consequences of overfishing, but also the social and economic drivers of fisher behavior. The extinction risk of sharks is highest in coastal tropical waters, where small‐scale fisheries are most prevalent.
Temple AJ, Berggren P, Jiddawi N, Wambiji N, Poonian CNS, Salmin YN, Berumen ML, Stead SM.   +7 more
europepmc   +2 more sources

Quantifying the behavioural consequences of shark ecotourism [PDF]

Scientific Reports, 2023
Shark populations globally are facing catastrophic declines. Ecotourism has been posited as a potential solution to many of the issues facing shark conservation, yet increasingly studies suggest that such activity may negatively influence aspects of ...
Joel H. Gayford, William D. Pearse, Rafael De La Parra Venegas, Darren A. Whitehead   +3 more
doaj   +2 more sources

Key drivers of at-vessel mortality in demersal sharks. [PDF]

Conserv Biol
Abstract Chondrichthyans are highly vulnerable to fisheries overexploitation, and postcapture mortality poses a significant threat to most species. Global bycatch mitigation guidelines recommend adopting hierarchical decision‐making approaches tailored to species‐specific vulnerabilities and socioeconomic and regulatory contexts.
Ruiz-García D, Barría C, Raga JA, March D.   +3 more
europepmc   +2 more sources

Mitochondrial DNA patterns describe the evolutionary history of the bonnethead shark Sphyrna tiburo (Linneus 1758) complex in the western Atlantic Ocean. [PDF]

J Fish Biol
Abstract The apparent lack of physical barriers in the marine realm has created the conception that many groups have a constant gene flow. However, changes in ocean circulation patterns, glacial cycles, temperature, and salinity gradients are responsible for vicariant events in many fish species, including sharks.
Ochoa-Zavala M, Mar-Silva AF, Pérez-Rodríguez R, Palacios-Barreto P, Adams DH, Blanco-Parra MDP, Díaz-Jaimes P.   +6 more
europepmc   +2 more sources