Results 11 to 20 of about 403 (142)

Beyond the Meal: Trophic Controls by Pelagic and Demersal Chondrichthyes in Two Different Mediterranean Marine Food Webs. [PDF]

Ecol Evol
Pelagic and demersal sharks played different top‐down controls in the food web. Pelagic sharks act as apex predators impacting mesoconsumers. Trophic controls patterns by demersal sharks change according to ecosystem traits. ABSTRACT Pelagic and demersal Chondrichthyes can assume different patterns of trophic controls on marine food webs, sustaining ...
Ricci P, Finotto L, Barausse A, Zampieri C, Mazzoldi C, Cipriano G, De Luca FP, Carlucci R.   +7 more
europepmc   +2 more sources

Habitat Availability, Jurassic and Cretaceous Origins of the Deep-Bodied Shark Morphotype and the Rise of Pelagic Sharks. [PDF]

Ecol Evol
We find support for a benthic origin of sharks, with four discrete transitions towards pelagic‐type morphology occurring during the Jurassic and Cretaceous. Increased habitat availability driven by biotic and abiotic environmental change may have driven shifts towards pelagic‐type morphology. These results may help explain discordance between molecular
Gayford JH, Jambura PL, Türtscher J, Sternes PC, Seamone SG, Shimada K.   +5 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

Resource partitioning among pelagic predators remains stable despite annual variability in diet composition. [PDF]

J Anim Ecol
The authors present a diet dataset from 10 oceanic predators from the California Current Ecosystem. Over the two‐decade study period, predator diets varied but diet overlap among predators remained stable. This work demonstrates that resource use does not need to be consistent for competitors to maintain distinct realized niches. Abstract Diet data are
Portner EJ, Muhling BA, Preti A, Snodgrass OE, Richards TM, Nickels CF, Dewar H, Hazen EL, Choy CA.   +8 more
europepmc   +2 more sources

In Troubled Waters: Applying DNA Barcoding to Monitor Singapore's Shark Fin Trade. [PDF]

Ecol Evol
Bar chart detailing species or genus identification, occurrence and IUCN status. An asterisk (*) indicates CITES Appendix II listed species. An asterisk next to a genus level identification indicates that the species identified within this genus are listed on Appendix II.
Ramanan A, Quek KH, Chung Mae Sze N, Oo Xinyen NI, Kim Hyun Soo D, Sung C, Dimitrov V, Nix RP, Sng MHM, Lim PXJ, Lim EXY, Wainwright BJ.   +11 more
europepmc   +2 more sources

Evidence of Fine-Scale Genetic Structure in Tiger Sharks (<i>Galeocerdo cuvier</i>) Highlights the Importance of Stratified Sampling Regimes. [PDF]

Evol Appl
ABSTRACT Understanding the biological connections between populations is essential to wildlife management and conservation. Genetic studies play a central role in characterizing these connections, but typically require stratified sampling regimes to assess the spatial extent and strength of gene flow, and the relative influences of sex and ontogeny on ...
Fish JJ, Dudgeon C, Barnett A, Butcher PA, Holmes BJ, Huveneers C, Meyer L, Vigliola L, Sherman CDH, Miller AD.   +9 more
europepmc   +2 more sources

Habitat use and diel vertical migration of bigeye thresher shark: Overlap with pelagic longline fishing gear [PDF]

Marine Environmental Research, 2015
Pelagic longliners targeting swordfish and tunas in oceanic waters regularly capture sharks as bycatch, including currently protected species as the bigeye thresher, Alopias superciliosus. Fifteen bigeye threshers were tagged with pop-up satellite archival tags (PSATs) in 2012-2014 in the tropical northeast Atlantic, with successful transmissions ...
Coelho, Rui, Fernandez-Carvalho, Joana, Santos, Miguel N.   +2 more
openaire   +3 more sources

Thresher sharks (Alopiidae) catch in the pelagic fisheries of Western Indonesia

IOP Conference Series: Earth and Environmental Science, 2020
Abstract Thresher sharks (family Alopiidae) are an evolutionarily distinct and globally endangered species group. Indonesia is the world’s largest shark fishing nation, and a global priority for reducing the capture of threatened shark species.
M Ichsan, S Ula, B Simeon, E Muttaqin, H Booth   +4 more
openaire   +1 more source

Concentrations and stable isotopes of mercury in sharks of the Galapagos Marine Reserve: Human health concerns and feeding patterns

Ecotoxicology and Environmental Safety, 2021
The human ingestion of mercury (Hg) from sea food is of big concern worldwide due to adverse health effects, and more specifically if shark consumption constitutes a regular part of the human diet.
Laurence Maurice, Gaël Le Croizier, Gabriela Morales, Natalia Carpintero, Juan M. Guayasamin, Jeroen Sonke, Diego Páez-Rosas, David Point, Walter Bustos, Valeria Ochoa-Herrera   +9 more
doaj   +1 more source

Diel Vertical Habitat Use Observations of a Scalloped Hammerhead and a Bigeye Thresher in the Northern Gulf of Mexico

Fishes, 2022
Understanding habitat use of elasmobranchs in pelagic environments is complicated due to the mobility of these large animals and their ability to move great distances in a three-dimensional environment.
Taylor Anderson, Emily N. Meese, James Marcus Drymon, Gregory W. Stunz, Brett Falterman, Elias Menjivar, R. J. David Wells   +6 more
doaj   +1 more source