Results 61 to 70 of about 3,578 (213)

A Conceptual Framework and Methods for Studying the Connectivity of Fishes

Fish and Fisheries, Volume 27, Issue 2, Page 342-369, March 2026.
ABSTRACT Connectivity is a multifaceted concept that has important implications for the management and conservation of marine and freshwater fishes. We developed a conceptual framework that encompasses multiple, interrelated categories of connectedness, including landscape (e.g., structural, functional) connectivity and ecological (e.g., trophic ...
Jordanna N. Bergman, Jessica A. Robichaud, Jasper McCutcheon, Michael T. Booth, Brendan Campbell, Grace A. Casselberry, Cienna R. Cooper, Bronwyn M. Gillanders, Lucas P. Griffin, Edward Hale, Luc LaRochelle, Karen J. Murchie, Mary Peacock, Reid G. Swanson, Simon D. Stewart, Ryan. J. Woodland, Daniel P. Zielinski, Steven J. Cooke, Morgan L. Piczak   +18 more
wiley   +1 more source

Long‐Term Habitat Use Patterns of Ray Assemblages in Coastal and Inshore Waters of the Eastern Gulf of Mexico

Marine Ecology, Volume 47, Issue 2, March/April 2026.
ABSTRACT Rays are common marine mesopredators that use coastal and estuarine habitats during multiple life history stages for critical functions. They are long‐lived, late to mature, and have low reproductive output, making them vulnerable to and slow to recover from population threats such as overfishing and habitat loss.
Julian R. Gatch, Matthew E. Kimball, Robert P. Dunn, Alan Moore, Lina Vanesa Garzón‐Peña, Angelica Barrera‐García   +5 more
wiley   +1 more source

Conservation Value of Shallow‐Water Habitats for Rays Within a Long‐Standing Marine Protected Area

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 2, February 2026.
ABSTRACT Marine protected areas (MPAs) are a widely used tool in the conservation and protection of threatened marine species. When MPAs include the key habitat of species into their design, they can provide refuge and opportunity for recovery from exploitative pressures.
Ciaran A. Hyde, Peter M. Kyne, Simon J. Pierce, Zoe Carey, Scout Fisher, Jan‐Olaf Meynecke, Ross G. Dwyer   +6 more
wiley   +1 more source

Morphology and morphometry of blood cells of two species of freshwater stingrays (Chondrichthyes: Potamotrygoninae) from the lower Solimões river, Amazon [PDF]

Anais da Academia Brasileira de Ciências
Cytomorphological evaluation of peripheral blood provides information about the health status of animals, in addition to being indicators of environmental contamination.
MARCIO QUARA DE C. SANTOS, FLÁVIA DAYANE F. FARIAS, PAULO HENRIQUE R. ARIDE, ADRIANO T. OLIVEIRA   +3 more
doaj   +1 more source

The use of pelvic fins for benthic locomotion during foraging behavior in Potamotrygon motoro (Chondrichthyes: Potamotrygonidae)

Zoologia (Curitiba), 2015
Synchronized bipedal movements of the pelvic fins provide propulsion (punting) during displacement on the substrate in batoids with benthic locomotion. In skates (Rajidae) this mechanism is mainly generated by the crural cartilages.
Akemi Shibuya, Marcelo R. de Carvalho, Jansen Zuanon, Sho Tanaka   +3 more
doaj   +1 more source

Mercury Levels in Marine and Estuarine Fishes of Florida 1989–2001. 2nd edition revised [PDF]

, 2003
The Florida Fish and Wildlife Conservation Commission’s Florida Marine Research Institute (FWC-FMRI) has examined total mercury levels in muscle tissue from a variety of economically and ecologically important species as part of an ongoing study to ...
Adams, Douglas H., Henderson, George E, McMichael, Robert H.   +2 more
core  

Always chew your food: freshwater stingrays use mastication to process tough insect prey [PDF]

Proceedings of the Royal Society B: Biological Sciences, 2016
Chewing, characterized by shearing jaw motions and high-crowned molar teeth, is considered an evolutionary innovation that spurred dietary diversification and evolutionary radiation of mammals. Complex prey-processing behaviours have been thought to be lacking in fishes and other vertebrates, despite the fact that many of these animals feed on tough ...
Matthew A. Kolmann, Kenneth C. Welch, Adam P. Summers, Nathan R. Lovejoy   +3 more
openaire   +2 more sources

Cyrilia sp. (Apicomplexa: Haemogregarinidae) in the Amazonian freshwater stingray Potamotrygon wallacei (cururu stingray) in different hydrological phases of the Rio Negro

Brazilian Journal of Biology
Intraerythrocytic parasites are frequently found in fish, including elasmobranchs. The Amazonian rivers present well defined annual hydrological cycles that results in drastic modifications of the environmental conditions with deep implications in the ...
A. T. Oliveira, M. L. G. Araújo, J. Pantoja-Lima, P. H. R. Aride, M. Tavares-Dias, R. P. Brinn, J. L. Marcon   +6 more
doaj   +1 more source

The cognitive role of concept variability

Mind &Language, Volume 41, Issue 1, Page 66-87, February 2026.
I present and defend concept variability, the view that concepts can admit of indefinitely many variations and changes in their representational contents without thereby losing their identity. I argue that the variability of concepts is central to their role in enabling cognition, and thus that a concept's content variability is, despite philosophical ...
Alnica Visser
wiley   +1 more source

Highly migratory shark fisheries research by the National Shark Research Consortium (NSRC), 2002-2007 [PDF]

, 2007
The National Shark Research Consortium (NSRC) includes the Center for Shark Research at Mote Marine Laboratory, the Pacific Shark Research Center at Moss Landing Marine Laboratories, the Shark Research Program at the Virginia Institute of Marine Science,
Burgess, George H., Cailliet, Gregor M., Ebert, David A., Hueter, Robert E., Musick, John A.   +4 more
core