Skates
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Growth and reproduction in captivity unveils remarkable life-history plasticity in the smallnose fanskate, Sympterygia bonapartii (Chondrichthyes: Rajiformes)
ABSTRACT We analyzed growth and reproduction of captive-born smallnose fanskates Sympterygia bonapartii. Egg cases were obtained from oviposition of two females caught in the wild and held at Temaikèn Aquarium. Following hatching, growth was analyzed in 13 females and 21 males until sexual maturity. Pattern of oviposition activity and reproductive performan
Neotrop. ichthyol.. Publicado em: 06/12/2018
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2. Reproductive biology of Sympterygia bonapartii (Chondrichthyes: Rajiformes: Arhynchobatidae) in San Matías Gulf, Patagonia, Argentina
ABSTRACT This study estimates and analyses the reproductive parameters and cycle of Sympterygia bonapartii in San Matías Gulf, northern Patagonia, Argentina. A total of 827 males and 1,299 females were analysed. Males ranged from 185 to 687 mm of total length (TL) and females from 180 to 742 mm TL. Sexual dimorphism was detected; females were larger, heavie
Neotrop. ichthyol.. Publicado em: 03/04/2017
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3. The use of pelvic fins for benthic locomotion during foraging behavior in Potamotrygon motoro (Chondrichthyes: Potamotrygonidae)
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. Although lacking these anatomical structures, some stingray species show modifications of their pelvic fins to aid in benthic l
Zoologia (Curitiba). Publicado em: 2015-06
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4. Reproductive biology of the skates Sympterygia acuta Garman, 1877 and S. bonapartii Müller & Henle, 1841 (Chondrichthyes: Rajoidei) in south Brazil
O presente estudo analisou o desenvolvimento sexual, os tamanhos de maturidade e as relações morfométricas para ambos os sexos das espécies Sympterygia acuta e S. bonapartii endêmica do sudoeste do Oceano Atlântico. Os indivíduos foram coletados em cruzeiros de investigação e viagens de pesca comercial durante 2011 e 2012 ao longo da costa do Sul do
Neotrop. ichthyol.. Publicado em: 11/11/2014
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5. Estado pirata : performance e cidade
The present research accost the question about constitution of the space, starting from the frontiers and the limits with its surroundings, searching for an understanding of how to configure the street space and how it relates to the performance itself, emphasizing the aspect of the pirate state, where the watching crowd is robed of its routine stage. In the
Publicado em: 2008
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6. A Física nos brinquedos : o brinquedo como recurso institucional no ensino da terceira lei de Newton
The traditional education has done little in terms of motivating and generate learning among the students. Among many alternatives researched for the overcoming, at the Physics teaching, the experiments with toys that were or still are part of the students reality have been tested and produced some accomplishments. The present dissertation shows a methodolog
Publicado em: 2007
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7. "Dinâmica populacional de raias demersais dos gêneros Atlantoraja e Rioraja (Elasmobranchii, Rajidae) da costa sudeste e sul do Brasil" / Populational dymanics of skates genera Atlantorala and Rioraja (Elasmosbranchii, Rajidae) of Southeastern and Southern Coastal of Brazil
The proportions of the skates Rioraja agassizi, Atlantoraja cyclophora, A. platana and A. castelnaui landed by commercial fishing boats were analyzed. Data were collected from 358 hauls of 20 trips made by 11 double-otter trawlers and pair-trawlers. Fisheries were carried out between 10 and 430 m deep and from 23° S (State of Rio de Janeiro) to 31° S (Stat
Publicado em: 2006
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8. Exquisite sensitivity of electroreceptor in skates.
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9. Structure, function and molecular adaptations of haemoglobins of the polar cartilaginous fish Bathyraja eatonii and Raja hyperborea
Cartilaginous fish are very ancient organisms. In the Antarctic sea, the modern chondrichthyan genera are poorly represented, with only three species of sharks and eight species of skates; the paucity of chondrichthyans is probably an ecological consequence of unusual trophic or habitat conditions in the Southern Ocean. In the Arctic, there are 26 species be
Portland Press Ltd..
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10. Ion channels and transporters in the electroreceptive ampullary epithelium from skates.
Two ampullary epithelial properties necessary for electroreception were used to identify the types of ion channels and transporters found in apical and basal membranes of ampullary receptor cells of skates and to assess their individual role under voltage-clamp conditions. The two essential properties are (1) a steady-state negative conductance generated in
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11. Localization and function of the electrical oscillation in electroreceptive ampullary epithelium from skates.
A steady, spontaneous current oscillation (1 nA p-p) occurs in voltage-clamped, isolated ampullary organs (canal, ampulla, and nerve) from skates (Raja). Spectral analysis showed that energy in the oscillation was confined to a narrow band of frequencies (3 Hz) about a fundamental frequency (32 Hz at 20 degrees C) and in harmonics. The frequency of the oscil
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12. Interaction of apical and basal membrane ion channels underlies electroreception in ampullary epithelia of skates.
The exquisite sensitivity of elasmobranch fishes to electric fields is thought to reside in electroreceptive organs called ampullae of Lorenzini. We measured the stimulus-response behavior of ampullary organs excised from skates. Under open-circuit conditions, the ampullary organ showed three distinct response states: spontaneous repetitive spikes, evoked sp
The Biophysical Society.