Results 71 to 80 of about 28,986 (305)

Top predators, shared prey: isotopic niche dynamics and trophic interactions among dusky, tiger and white sharks

Endangered Species Research
Assessing the trophic relationships among sympatric marine predators is crucial for ecosystem and fisheries management. This study used carbon and nitrogen stable isotope analysis to elucidate resource use and sharing of dusky Carcharhinus obscurus ...
RS Lipscombe, V Raoult, PA Butcher
doaj   +1 more source

Scalloped hammerhead sharks swim on their side with diel shifts in roll magnitude and periodicity

Animal Biotelemetry, 2020
Background Great hammerhead sharks (Sphyrna mokarran) routinely swim on their sides and periodically roll from side to side. A previous study used wind tunnel tests with a rigid model hammerhead shark to demonstrate that the rolling behavior could ...
Mark Royer, Kelsey Maloney, Carl Meyer, Edward Cardona, Nicholas Payne, Kate Whittingham, Guilherme Silva, Chloe’ Blandino, Kim Holland   +8 more
doaj   +1 more source

Developmental morphology of claspers and clasper‐glands during maturation in Potamotrygon wallacei (Chondrichthyes: Potamotrygoninae)

The Anatomical Record, EarlyView.
Abstract The claspers are the copulatory organs in male elasmobranchs, responsible for directing the semen into the female cloaca (C). However, the microscopic morphology of the claspers remains poorly understood. This study describes the morphology of the claspers and clasper glands (CGs) of cururu stingray (Potamotrygon wallacei) at different ...
Matheus Samuel Cunha Braga, Grazyelle Sebrenski da Silva, Maria Inês Braga de Oliveira, Jaydione Luiz Marcon, Ruben Dario Morales Gamba   +4 more
wiley   +1 more source

An integrated baseline assessment of reef-associated sharks around Saba (Dutch Caribbean), combining three methods: stereo-BRUVs, telemetry and citizen science

Royal Society Open Science
The Exclusive Economic Zone of Saba (Dutch Windward Islands) has been designated Yarari Marine Mammal and Shark Sanctuary. However, to effectively conserve sharks, a baseline on their diversity and spatiotemporal distribution is required.
Guido Leurs, Martin de Graaf, Dahlia Hassell-Knijff, Larissa Ayumi Kuramae Izioka, Wouter van Looijengoed, Melanie P. Meijer zu Schlochtern, Tadzio Bervoets, Leopold A. J. Nagelkerke, Hendriks V. Winter   +8 more
doaj   +1 more source

Description of large, well‐preserved Enchodus specimens from the Bearpaw Formation of Alberta, Canada

The Anatomical Record, EarlyView.
Abstract Fishes of the genus Enchodus were abundant and cosmopolitan in the Late Cretaceous, but are primarily known from isolated remains in Canada. Four well‐preserved fish skulls were recovered in recent years from ammolite mines sampling the Bearpaw Formation of Southern Alberta, and are here referred to Enchodus petrosus Cope, 1874.
Luke E. Nelson, Alison M. Murray, Donald B. Brinkman   +2 more
wiley   +1 more source

Extent, characteristics and policy applications of Key Biodiversity Areas

Biological Reviews, EarlyView.
ABSTRACT A global standard for the identification of Key Biodiversity Areas (KBAs) was published 10 years ago to provide a unified set of criteria for identifying ‘sites of significance for the global persistence of biodiversity’. We review the initiative's origins, the KBA identification process, characteristics of the current network, threats, policy
Stuart H. M. Butchart, Olivia Crowe, Tom Scott, Andrew J. Plumptre, Megan Eldred, Ellen McKee, Zoltan Waliczky, Ibrahim Al Hasani, Adrián B. Azpiroz, Daniele Baisero, Fred Barasa, Alison E. Beresford, Bezeng S. Bezeng, Charlotte Boyd, Thomas M. Brooks, Graeme Buchanan, Gill Bunting, Sofia Capellan, Neil Cox, Tim R. B. Davenport, Tammy E. Davies, Gina Della Togna, Wendy Elliott, Matt Foster, Jo Gilbert, Jonathan M. Handley, Diego Juffe‐Bignoli, Victoria R. Jones, Naomi Kingston, Jeannot Kivono, John Lamoreux, Penny F. Langhammer, James Lewis, Bruce Liggitt, Daniel Marnewick, Paul Matiku, Erin McCreless, Rachel A. Neugarten, Catherine Numa, Mark O'Brien, Madhu Rao, Ciara Raudsepp‐Hearne, Justina C. Ray, Samridhi Rijal, Jon Paul Rodríguez, Jurgis Sapijanskas, Wes Sechrest, Martin Sneary, Andrew Snyder, Konstantina Spiliopoulou, Thomas Starnes, Cecilia Tobar, Gautam Surya, Marcelo F. Tognelli, Andrew W. Tordoff, Maria G. Toscano, Yongyut Trisurat, Amy Upgren   +57 more
wiley   +1 more source

Sharks

Choice Reviews Online, 2002
Biblioteca de Educación del Ministerio de Educación, Cultura y Deporte; Calle San Agustín, 5 - 3 planta; 28014 Madrid; Tel.
openaire   +3 more sources

Seabirds mediate intraguild and competitive interactions in a shark community

Ecosphere
Intraguild predation (IGP) and competition significantly influence resource utilization patterns among sympatric species. The presence of alternative prey (consumed only by intraguild [IG] predators and not IG prey) may promote coexistence and have a ...
Chloé A. Blandino, Yannis P. Papastamatiou, Jonathan J. Dale, Carl G. Meyer   +3 more
doaj   +1 more source

Great white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011

, 2012
Includes bibliographical references.The South African Government introduced protective legislation prohibiting targeted fishing of the great white shark Carcharodon carcharias in 1991.
Towner, Alison
core  

Data Collection, Research, and Assessment Efforts for Pelagic Sharks by the International Commission for the Conservation of Atlantic Tunas

, 2008
This chapter contains sections titled: Introduction Assessment of blue and shortfin mako sharks Conclusions ...
Nakano, Hideki, Babcock, Elizabeth A
core   +1 more source