Results 1 to 10 of about 1,113 (96)

Drivers of diversification in sharks and rays (Chondrichthyes: Elasmobranchii) [PDF]

Frontiers in Ecology and Evolution
Elasmobranchs (sharks and rays) are a charismatic lineage of unquestionable ecological importance in past and present marine ecosystems. Represented by over 1200 species, elasmobranchs have undergone substantial shifts in taxonomic diversity since their ...
Joel H. Gayford, Joel H. Gayford, Patrick L. Jambura   +2 more
doaj   +2 more sources

The ancient and helical architecture of Elasmobranchii's spermatozoa enables progressive motility in viscous environments. [PDF]

PLoS ONE
Subclass Elasmobranchii belongs to an old evolutionary class of Chondrichthyes that diverged 450 mya, presenting a wide diversity of reproductive strategies while preserving the ancient mode of internal fertilization.
Sergii Boryshpolets, Borys Dzyuba, Pablo García-Salinas, Hermes Bloomfield-Gadêlha, Victor Gallego, Anatoliy Sotnikov, Juan F Asturiano   +6 more
doaj   +2 more sources

No evidence for population-level benefits of polyandry in sharks and rays. [PDF]

PLoS ONE
Mating system variation refers to the spectrum between genetic monogamy and polyandry, and has important consequences for sexual conflict, sexual selection and individual fitness in animals.
Joel H Gayford, Estefanía M Flores-Flores   +1 more
doaj   +2 more sources

Evolutionary trends in the elasmobranch neurocranium [PDF]

Scientific Reports
The neurocranium (braincase) is one of the defining vertebrate characters. Housing the brain and other key sensory organs, articulating with the jaws and contributing to the shape of the anteriormost portion of the body, the braincase is undoubtedly of ...
Joel H. Gayford, Martin D. Brazeau, Gavin J. P. Naylor   +2 more
doaj   +2 more sources

#Sawfish: Social media to assess public perceptions, behaviors, and attitudes towards a critically endangered species

Frontiers in Conservation Science, 2022
Monitoring population size and dynamics of threatened or low-density species is often both logistically difficult and costly. Recently, social media has emerged as a new tool for species monitoring.
Julia Saltzman, Julia Saltzman, Jasmin Graham, Julia Wester, Julia Wester, Julia Wester, Easton R. White, Catherine C. Macdonald, Catherine C. Macdonald   +8 more
doaj   +1 more source

Assessing the Stock Dynamics of Elasmobranchii off the Southern Coast of Sicily by Using Trawl Survey Data

Fishes, 2022
Elasmobranchii (sharks and rays), which have peculiar and vulnerable life-history traits, are highly threatened by fishing activities. Indeed, between 53% and 71% of Mediterranean elasmobranch species are at risk of extinction. In this context, using the
Fabio Falsone, Vita Gancitano, Michele Luca Geraci, Giacomo Sardo, Danilo Scannella, Fabrizio Serena, Sergio Vitale, Fabio Fiorentino   +7 more
doaj   +1 more source

The complete mitochondrial genome of the endemic Iberian pygmy skate Neoraja iberica Stehmann, Séret, Costa, & Baro 2008 (Elasmobranchii, Rajidae)

Mitochondrial DNA. Part B. Resources, 2021
Skates, Chondrichthyes fishes from order Rajiformes, are the most species-rich group of all Batoidea. However, their phylogenetic relationships and systematics is still a highly discussed and controversial subject.
André Gomes-dos-Santos, André M. Machado, Sofia Graça Aranha, Ester Dias, Ana Veríssimo, L. Filipe C. Castro, Elsa Froufe   +6 more
doaj   +1 more source

A Novel One Health Approach concerning Yeast Present in the Oral Microbiome of the Endangered Rio Skate (Rioraja agassizii) from Southeastern Brazil

Microorganisms, 2023
The current climate change scenario caused by anthropogenic activities has resulted in novel environmental pressures, increasing the occurrence and severity of fungal infections in the marine environment.
Manoel Marques Evangelista Oliveira, Amanda Pontes Lopes, Tatiane Nobre Pinto, Gisela Lara da Costa, Aristóteles Goes-Neto, Rachel Ann Hauser-Davis   +5 more
doaj   +1 more source

Molecular characterization of marine and coastal fishes of Bangladesh through DNA barcodes

Ecology and Evolution, 2021
This study describes the molecular characterization of marine and coastal fishes of Bangladesh based on the mitochondrial cytochrome c oxidase subunit I (COI) gene as a marker.
Md. Sagir Ahmed, Sujan Kumar Datta, Tonmoy Saha, Zarif Hossain   +3 more
doaj   +1 more source

Species Delimitation of Southeast Pacific Angel Sharks (Squatina spp.) Reveals Hidden Diversity through DNA Barcoding

Diversity, 2021
Angel sharks are distributed worldwide in tropical to subtropical waters. Across the Eastern Pacific Ocean (EPO), two valid species are reported: The Pacific angelshark Squatina californica and the Chilean angelshark Squatina armata; however, there is ...
Rosa M. Cañedo-Apolaya, Clara Ortiz-Alvarez, Eliana Alfaro-Cordova, Joanna Alfaro-Shigueto, Ximena Velez-Zuazo, Jeffrey C. Mangel, Raquel Siccha-Ramirez, Carmen Yamashiro, Jorge L. Ramirez   +8 more
doaj   +1 more source