Results 41 to 50 of about 6,684 (211)

Tasa de oviposición de la raya marmolada Sympterygia bonapartii (Elasmobranchii, Rajidae) (Müller & Henle, 1841) mantenida en cautiverio [PDF]

, 2009
Se registró la tasa de oviposición de Symperygia bonapartii en cautiverio. En un período de un año una hembra depositó 152 ovicápsulas a una tasa de 0.4 huevos por día y la otra depositó 200 ovicápsulas a una tasa de 0.5 huevos por día.The oviposition ...
Jañez, Julieta A., Sueiro, Maria Cruz
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Adult and offspring size in the ocean over 17 orders of magnitude follows two life history strategies [PDF]

, 2015
Explaining variability in offspring vs. adult size among groups is a necessary step to determine the evolutionary and environmental constraints shaping variability in life history strategies.
Andersen, Ken Haste, Hartvig, Martin, Heuschele, Jan, Hylander, Samuel, Kiørboe, Thomas, Neuheimer, Anna, Olsson, Karin H., Sainmont, Julie   +7 more
core   +2 more sources

Nervus terminalis in dogfish (Squalus acanthias, Elasmobranchii) carries tonic efferent impulses [PDF]

Neuroscience Letters, 1984
Recordings from the intact nervus terminalis with a hook electrode or from a stump of the divided nerve with a suction electrode show a tonic, irregular discharge of broad, low frequency spikes in ca. 4-6 units. These nerve impulses are efferent from the brain.
Bullock, Theodore H., Northcutt, R. Glenn   +1 more
openaire   +3 more sources

Beyond mammals: the evolution of chewing and other forms of oropharyngeal food processing in vertebrates

Biological Reviews, EarlyView.
ABSTRACT Oropharyngeal food processing exhibits a remarkable diversity among vertebrates, reflecting the evolution of specialised ‘processing centres’ associated with the mandibular, hyoid, and branchial arches. Although studies have detailed various food‐processing strategies and mechanisms across vertebrates, a coherent and comprehensive terminology ...
Daniel Schwarz, Maja Mielke, Stephan Handschuh, Anthony Herrel, Patrick Lemell, Léa Da Cunha, Nicolai Konow   +6 more
wiley   +1 more source

Evaluating and Advancing the Use of Shore‐Based Observers for Scientific Sampling and Catch Verification in High‐Volume Fisheries

Fisheries Management and Ecology, EarlyView.
ABSTRACT Shore‐based observers are increasingly being used in place of at‐sea observers to monitor and sample commercial fisheries catch. However, few evaluations assess whether these programs meet their stated goals or how to optimize them, and industry data are rarely tested for accuracy despite serving as the foundation for catch accounting. Using a
Christian Gredzens, Andy Kingham, Jason E. Jannot   +2 more
wiley   +1 more source

Distribution modelling for Neotropical freshwater stingrays Potamotrygon brachyura and Potamotrygon motoro (Myliobatiformes, Potamotrygonidae) in the Uruguay River basin

Journal of Fish Biology, EarlyView.
Abstract This study aimed to identify geographical distribution patterns of the giant short‐tailed river stingray Potamotrygon brachyura and the motoro stingray Potamotrygon motoro in the Uruguay River basin. Data on presence/absence of stingrays were based on fishers' knowledge accessed by interviews through expeditions in Brazil, Argentina and ...
Danilo Araujo Soares Pereira, Roberto E. Reis, Nelson F. Fontoura   +2 more
wiley   +1 more source

The oldest fossil record of the megamouth shark from the late Eocene of Denmark and comments on the enigmatic megachasmid origin [PDF]

Acta Palaeontologica Polonica, 2016
The megamouth shark (Lamniformes: Megachasmidae) has sporadic occurrences both in the present-day oceans and in the fossil record. In this paper, we describe a new megachasmid, Megachasma alisonae sp.
Kenshu Shimada, David J. Ward
doaj   +1 more source

Evidencia del máximo número de crías en la raya mariposa, Gymnura lessae (Myliobatiformes: Gymnuridae), en el Golfo de México

Acta Zoológica Lilloana, 2023
La raya mariposa menor Gymnura lessae es endémica del atlántico noroccidental, incluyendo al Golfo de México. Es una especie con dimorfismo sexual, vivípara y con un ciclo anual reproductivo. En esta contribución se confirma el máximo número de crías en
ANDY ALEXANDER LARA-ALCANTARA, OSCAR MENDEZ, LUIS FERNANDO DEL MORAL-FLORES   +2 more
doaj   +1 more source

Linking rivers, mixing faunas: How artificial connectivity between the Middle and Upper Paraná River basins shapes fish diversity in a tributary of the Itaipu Reservoir, Brazil

Journal of Fish Biology, EarlyView.
Abstract This work aimed to investigate the distribution and occurrence of fish species along the São Francisco Falso Braço Norte (SFFBN) River basin, a tributary of the Middle Paraná River basin now artificially connected to the Upper Paraná ecoregion, to evaluate how such connectivity may affect the biogeographic distribution and regional composition
Lucas E. P. Kampfert, João C. Maicrovicz, Daniel R. Blanco, Denise Lange, Carla S. Pavanelli, Heleno Brandão   +5 more
wiley   +1 more source

Myocardial trabeculation in embryos of Scyliorhinus canicula (Elasmobranchii, Chondrichthyans) [PDF]

, 2018
Currently, three types of ventricular myoarchitecture are recognized in vertebrates, namely compact, spongy (trabeculated) and mixed myocardium. Mixed myocardium, which has been recently proposed as the primitive condition in gnathostomes, is composed of
Durán-Boyero, Ana Carmen, Fernández-Corujo, Borja, Lorenzale, Miguel, López-Unzu, Miguel A., Rodríguez, Cristina   +4 more
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