Rana catesbeiana
Underwater Hearing in the Frog, Rana Catesbeiana
... Comparable auditory sound pressure level SPL and sound intensity level SIL threshold curves were determined in air and under water in Rana catesbeiana.. Threshold curves were determined [r] ...
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Movements of Rana catesbeiana tadpoles in weak current flows resemble a directed random walk
... Rana catesbeiana, Shaw 1802, tadpoles were obtained from a commercial supplier (Dozier Lester, Duson, LA, USA) or collected from a natural breeding site in Rhode Island (State of RI collection permit ...
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Seasonal changes in the cardiovascular, respiratory and metabolic responses to temperature and hypoxia in the bullfrog rana catesbeiana
... Four groups (one for each season) of adult bullfrogs (Rana catesbeiana) of either sex weighing (mean ± S . E . M .) 175.90±8.16 g in spring (N=30, 54 % males and 46 % females), 174.99±4.31 g in summer ...
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Chemical exposure dynamics of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCs) in green frog (Rana clamitans ) and bullfrog (Rana catesbeiana) tadpoles
... Rana catesbeiana. By examining the exposure dynamics of various chemicals during the different life stages of the green frog and bullfrog, we can develop life cycle models for these sp[r] ...
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THE effects of tonic lung inflation on ventilation in the American bullfrog Rana catesbeiana Shaw
... (Rana catesbeiana), breathing frequency (as determined by the frequency of bursts of motor activity in the trigeminal nerve; fictive breathing) was decreased when all proprioceptive feedback from the lungs ...
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Triiodothyronine (T3) action on aquatic locomotor behavior during metamorphosis of the bullfrog Rana catesbeiana
... ABSTRACT Thyroid hormones - particularly triiodothyronine, T 3 - play a critical role in the morphological transformations comprising metamorphosis in larval bullfrogs (Rana catesbeiana). Traditional ...
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Calcium Metabolism in Bullfrog Tadpoles (Rana Catesbeiana)
... The Ca content of bullfrog tadpoles Rana catesbeiana maintained without feeding for 8 days in different media Ca mmol kg body wt"1 Ca content of external media mM 0-2.. No added Ca.[r] ...
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Effects of medullary Raphé stimulation on fictive lung ventilation during development in Rana catesbeiana
... In a first series of experiments, a tungsten electrode (electrode diameter: 125· mol·l –1 , tapered tip size: 8°, AC resistance: 5·M ⍀ , model 575300; A-M Systems, Everett, WA, USA) was placed in the rostral portion of ...
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Acid base regulation in tadpoles of Rana catesbeiana exposed to environmental hypercapnia
... of Rana catesbeiana (Shaw) were air-shipped from North Carolina Biological Supply Company, USA, in July (mass range of individuals 4–13 g, most weighed between 6 and 8 g) and in November (mass range ...
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Characterization of circannual patterns of metabolic recovery from activity in Rana catesbeiana at 15°C
... (Rana catesbeiana) that successfully inhabit a range from British Columbia and Nova Scotia south into Mexico (Lannoo, 2005) must acclimatize to significant seasonal climate ...by Rana pipiens in ...
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Activation patterns and length changes in hindlimb muscles of the bullfrog Rana catesbeiana during jumping
... of Rana catesbeiana during jumping agree in general with those found for the smaller Rana pipiens and suggest that this muscle produces power throughout most of the take-off ...for Rana ...
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Cyclic AMP induces a relaxation response in the bullfrog Rana catesbeiana, but nitric oxide does not
... Cholecystokinin octapeptide (CCK), acetylcholine (ACh) and ceruletide have been shown to produce contraction in bullfrog (Rana catesbeiana) gallbladder strips. Agents capable of relaxing the bullfrog ...
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Respiration during chronic hypoxia and hyperoxia in larval and adult bullfrogs (Rana catesbeiana) II Changes in respiratory properties of whole blood
... Rana catesbeiana Shaw tadpoles and adults were maintained at 20-23 °C under aerial and aquatic normoxia P02 150mmHg, hyperoxia P02 275 mmHg and hypoxia P02 75 mmHg for 4 weeks, after whi[r] ...
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Controlling for the Effects of History and Nonequilibrium Conditions in Gene Flow Estimates in Northern Bullfrog (Rana catesbeiana) Populations
... Nonequilibrium conditions due to either allopatry followed by secondary contact or recent range expansion can confound measurements of gene flow among populations in previously glaciated regions. We determined the scale ...
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Developmental changes in chemoreceptive control of gill ventilation in larval bullfrogs (Rana catesbeiana) I Reflex ventilatory responses to ambient hyperoxia, hypoxia and NaCN
... Larval Rana catesbeiana were collected from ponds in western Massachusetts and maintained in holding tanks at 20–25 °C on a 14 h:10 h light:dark photoperiod. The animals were fed with boiled spinach ad ...
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Ontogeny of central chemoreception during fictive gill and lung ventilation in an in vitro brainstem preparation of Rana catesbeiana
... An isolated brainstem preparation of the bullfrog tadpole, Rana catesbeiana, displays coordinated rhythmic bursting activities in cranial nerves V, VII and X in vitro. In decerebrate, spontaneously ...
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Sexual dimorphism in forelimb muscles of the bullfrog, Rana catesbeiana: a functional analysis of isometric contractile properties
... on Rana catesbeiana is designed (i) to compare the isometric contractile properties (twitch and tetanic forces, force/frequency relationships, contraction kinetics and fatiguability) of selected forearm ...
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Development of the respiratory response to hypoxia in the isolated brainstem of the bullfrog Rana catesbeiana
... Experiments were performed on a total of 12 pre- metamorphic (mean body mass, 8.1·g), 5 post-metamorphic (mean body mass, 4.9·g) and 13 adult (mean body mass, 227·g) North American bullfrogs Rana ...
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Compensation of progressive hypercapnia in the toad (Bufo marinus) and the bullfrog (Rana catesbeiana)
... The results of the present ion flux experiments suggest that neither the terrestrial Bufo nor the semi-aquatic Rana increases Na + influx across its skin during hypercapnia.. Bufo did lo[r] ...
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Post Metamorphic Development of the Frequency Selectivities and Sensitivities of the Peripheral Auditory System of the Bullfrog, Rana Catesbeiana
... Post-stimulus time histograms PSTHs of primary auditory fibres showing the temporal response characteristics of the fibres to ioo ms tone bursts at each unit'* best excitatory frequency [r] ...
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