Results 61 to 70 of about 5,320 (221)

First detailed description of follicle development in a chimaeroid, the American elephant fish Callorhinchus callorhynchus

Theriogenology Wild, 2023
Chimaerods represent an enigmatic lineage of cartilaginous fishes and the least studied group within Chondrichthyans. They have a widespread global distribution with a high degree of endemism.
S.N. Fuentes, C.A. Awruch, C. Moya, A. Wehitt, M.C.Díaz Andrade   +4 more
doaj   +1 more source

Extinction risk and conservation of the world\u27s sharks and rays [PDF]

, 2014
The rapid expansion of human activities threatens ocean-wide biodiversity. Numerous marine animal populations have declined, yet it remains unclear whether these trends are symptomatic of a chronic accumulation of global marine extinction risk.
Burgess, George H., Carlson, John K., Carpenter, Kent E., Cavanagh, Rachel D., Compagno, Leonard J.V., Davidson, Lindsay N.K., Dulvy, Nicholas K., Ebert, David A., Fordham, Sonja V., Fowler, Sarah L., Francis, Malcolm P., Gibson, Claudine, Harrison, Lucy R., Heupel, Michelle R., Kyne, Peter M., Livingstone, Suzanne R., Musick, John A., Pollock, Caroline M., Sanciangco, Jonnell C., Simpfendorfer, Colin A., Stevens, John D., Valenti, Sarah, White, William T.   +22 more
core   +1 more source

Cutting blade dentitions in squaliform sharks form by modification of inherited alternate tooth ordering patterns [PDF]

, 2016
The squaliform sharks represent one of the most speciose shark clades. Many adult squaliforms have blade-like teeth, either on both jaws or restricted to the lower jaw, forming a continuous, serrated blade along the jaw margin.
Johanson, Z., Smith, M.M., Underwood, Charlie J.   +2 more
core   +1 more source

The distribution of a rarely encountered stingray, Megatrygon microps, informed by citizen science: A systematic review

Conservation Science and Practice, EarlyView.
This study combines literature and online data sources to expand the smalleye stingray's range, highlight ecological interactions and specific threats. Abstract Many chondrichthyan fishes are experiencing alarming population declines primarily due to overfishing, exacerbated by their inherently vulnerable life history traits including slow growth rates
Jennifer Ann Keeping, Artemis Caine, Charlotte Hopkins, David Bailey, Andrew Chin   +4 more
wiley   +1 more source

Testing models of dental development in the earliest bony vertebrates, Andreolepis and Lophosteus [PDF]

, 2012
Theories on the development and evolution of teeth have long been biased by the fallacy that chondrichthyans reflect the ancestral condition for jawed vertebrates.
Hector Botella, Henning Blom, Janvier P., John A. Cunningham, Martin Rücklin, Märss T., Pander C. H., Philip C. J. Donoghue, Rohon J. V., Schultze H.-P.   +9 more
core   +1 more source

Assessing Risk for Bycatch and Byproduct Species Using a Modified Sustainability Assessment for Fishing Effects (SAFE) Approach

Fish and Fisheries, EarlyView.
ABSTRACT Central to ecosystem‐based fisheries management is ensuring the sustainability of bycatch and byproduct species. However, the sustainability of these species is difficult to assess as the lack of information limits the use of traditional stock assessment methods.
Grant J. Johnson, Jonathan J. Smart, Vinay Udyawer, Rik C. Buckworth, Clive R. McMahon, Chalie Huveneers   +5 more
wiley   +1 more source

The Development of the Chimaeroid Pelvic Skeleton and the Evolution of Chondrichthyan Pelvic Fins

Journal of Developmental Biology, 2022
Pelvic girdles, fins and claspers are evolutionary novelties first recorded in jawed vertebrates. Over the course of the evolution of chondrichthyans (cartilaginous fish) two trends in the morphology of the pelvic skeleton have been suggested to have ...
Jacob B. Pears, Carley Tillett, Rui Tahara, Hans C. E. Larsson, Kate Trinajstic, Catherine A. Boisvert   +5 more
doaj   +1 more source

The Myosin Heavy Chain specific A4.1025 antibody discriminates different cardiac segments in ancient groups of gnathostomes: Morphological and evolutionary implications [PDF]

, 2016
El resumen aparece en el Program & Abstracts of the 11th International Congress of Vertebrate Morphology, Washington DC 2016. Anatomical Record, Volume 299, Special Feature: 263.The pan-Myosin Heavy Chain (pan-MyHC) marker MF20 have been reported to show
Durán, Ana C., Fernández, Borja, Lorenzale, Miguel, López-Unzu, Miguel A., Sans-Coma, Valentin, Soto, M. Teresa   +5 more
core  

Collective action problems posed by no-take zones [PDF]

, 2006
Around 0.04% of the world's marine area is presently designated as no-take zone (NTZ), in which all fishing is banned. The IUCN, backed by many marine fisheries and ecology scientists, has called for this to be increased to 20-30% by 2012 in order to ...
Jones, PJS
core   +1 more source

Occurrence of multiple congenital anomalies in Potamotrygon amandae (Elasmobranchii, Potamotrygoninae) embryos, including the first report of bicephaly

Journal of Fish Biology, EarlyView.
Abstract Reports of teratogenic embryos in elasmobranchs have been documented in multiple species, with proposed aetiologies including environmental disturbances, genetic mutations, predation, exposure to endocrine‐disrupting compounds and maternal stress.
Douglas de Castro Ribeiro, Raquel Lopes Queiroz, Cristiéle da Silva Ribeiro   +2 more
wiley   +1 more source