Growth of Tagged Frogs (Rana catesbeiana Shaw and Rana clamitans Daudin) under Natural Conditions

1941 ◽  
Vol 26 (1) ◽  
pp. 201 ◽  
Author(s):  
Edward C. Raney ◽  
William Marcus Ingram
Keyword(s):  
Rana Catesbeiana ◽  
Rana Clamitans ◽  
Natural Conditions

The Coccidia (Apicomplexa: Eimeriidae) of frogs from Algonquin Park, with descriptions of two new species

1989 ◽  
Vol 67 (7) ◽  
pp. 1686-1689 ◽  
Author(s):  
G. J. Chen ◽  
S. S. Desser
Keyword(s):  
New Species ◽  
Young Adult ◽  
Rana Catesbeiana ◽  
Polar Granule ◽  
Rana Sylvatica ◽  
Stieda Body ◽  
Rana Clamitans ◽  
Two New Species ◽  
Coccidian Parasites ◽  
Oocyst Residuum

During June and July of 1988, 264 amphibians from Algonquin Park, Ontario, were examined for eimeriid coccidian parasites; the species examined were Rana catesbeiana Shaw, Rana clamitans Latreille, Rana septentrionalis Baird, and Rana sylvatica LeConte. Two distinct types of oocysts were observed in the feces of the frogs. The highest prevalence of infection was recorded from young adult frogs and two new species of Eimeria are described from these animals. Oocysts of Eimeria algonquini n.sp. are spherical, 15.8 (14.5–16.1) μm in diameter, with a thin single-layered wall; micropyle and polar granule absent; large granular oocyst residuum present. Sporocysts banana-shaped, 19.5 (18.7–20.4) × 4.2 (3.8–4.6) μm with prominent granular residuum; Stieda body absent. Oocysts of Eimeria kermiti n.sp. are ovoid, 25.1 (24.7–26.6) × 19.5 (17.6–20.1) μm with thin single-layered wall; polar granule present; micropyle absent; large granular oocyst residuum present. Sporocysts ovoid, 9.9 (9.3–10.4) × 6.6 (6.0–7.1) μm with Stieda body and prominent granular residuum.

scholarly journals Selective enhancement and suppression of frog gustatory responses to amino acids.

1981 ◽  
Vol 77 (4) ◽  
pp. 373-385 ◽  
Author(s):  
K Yoshii ◽  
Y Kobatake ◽  
K Kurihara
Keyword(s):  
Amino Acids ◽  
Rana Catesbeiana ◽  
Receptor Site ◽  
Receptor Potential ◽  
Protein S ◽  
Alkaline Treatment ◽  
Receptor Protein ◽  
Natural Conditions ◽  
Tonic Component ◽  
Phasic Component

Properties of the receptor sites for L-amino acids in taste cells of the bullfrog (Rana catesbeiana) were examined by measuring the neural activities of the glossopharyngeal nerve under various conditions. (a) The frogs responded to 12 amino acids, but the responses to the amino acids varied with individual frogs under natural conditions. The frog tongues, however, exhibited similar responses after an alkaline treatment that removes Ca2+ from the tissue. The variation in the responses under natural conditions was apparently due to the variation in the amount of Ca2+ bound to the receptor membrane. (b) The responses to hydrophilic L-amino acids (glycine, L-alanine, L-serine, L-threonine, L-cysteine, and L-proline) were of a tonic type, but those to hydrophobic L-amino acids (L-valine, L-leucine, L-isoleucine, L-methionine, L-phenylalanine, and L-tyrptophan) were usually composed of both phasic and tonic components. (c) The properties of the tonic component were quite different from those of the phasic component: the tonic component was largely enhanced by the alkaline treatment and suppressed by the acidic treatment that increases binding of Ca2+ to the tissue. Also, the tonic component was suppressed by the presence of low concentrations of salts, or the action of pronase E, whereas the phasic component was unchanged under these conditions. These properties of the phasic component were quite similar to those of the response to hydrophobic substances such as quinine. These results suggest that the hydrophilic L-amino acids stimulate receptor protein(s) and that the hydrophobic L-amino acids stimulate both the receptor protein and a receptor site similar to that for quinine. (d) On the basis of the suppression of the responses to amino acids by salts, the mechanism of generation of the receptor potential is discussed.

Noisy Neighbors: Acoustic Interference and Vocal Interactions between Two Syntopic Species of Ranid Frogs, Rana clamitans and Rana catesbeiana

2018 ◽  
Vol 52 (2) ◽  
pp. 176 ◽  
Author(s):  
Susan Z. Herrick ◽  
Kentwood D. Wells ◽  
Timothy E. Farkas ◽  
Eric T. Schultz
Keyword(s):  
Rana Catesbeiana ◽  
Rana Clamitans ◽  
Acoustic Interference ◽  
Vocal Interactions

Acidity and associated water chemistry of amphibian habitats in Nova Scotia

1985 ◽  
Vol 63 (1) ◽  
pp. 97-105 ◽  
Author(s):  
J. M. Dale ◽  
B. Freedman ◽  
J. Kerekes
Keyword(s):  
Nova Scotia ◽  
Rana Catesbeiana ◽  
Function Analysis ◽  
Acid Tolerance ◽  
Rana Sylvatica ◽  
Rana Clamitans ◽  
Bufo Americanus ◽  
Amphibian Species ◽  
Species Groups ◽  
Field Transplant

One hundred and fifty-nine field sites consisting of ditches, bogs, marshes, ponds, and lakes in south and central Nova Scotia were surveyed for the presence of the adults, eggs, or larvae of 11 amphibian species. Water samples were analyzed for pH, alkalinity, color, conductivity, Na, K, Mg, Ca, SO4, and Cl. Discriminant function analysis revealed that none of these variables predicted a species' presence. Two three-species groups were found to be significantly associated among themselves, but mutually exclusive of each other. The two groups were (i) Ambystoma maculatum, Hyla crucifer, and Rana sylvatica and (ii) Rana clamitans, Rana catesbeiana, and Rana palustris. Rana sylvatica and A. maculatum were observed breeding successfully in an acidic bog (mean pH 4.1). Rana clamitans adults and larvae were located in the field at pHs as low as 3.5 and 3.9, respectively. Field transplant studies, using eggs of A. maculatum and R. sylvatica (at pH 5.7 and 4.1) and Bufo americanus (at pH 6.3 and 4.1), revealed that R. sylvatica was least sensitive to acidity. There is considerable variation in acid tolerance among the various species of Nova Scotia amphibians. Nevertheless, successful breeding by some species is occurring at very low pHs.

An intraerythrocytic virus and rickettsia of frogs from Algonquin Park, Ontario

1984 ◽  
Vol 62 (8) ◽  
pp. 1521-1524 ◽  
Author(s):  
Sherwin S. Desser ◽  
John R. Barta
Keyword(s):  
Electron Microscope ◽  
Rana Catesbeiana ◽  
Blood Parasites ◽  
Rana Clamitans ◽  
Virus Particles ◽  
Spherical Inclusions ◽  
Sphagnum Bog ◽  
Prokaryotic Microorganisms ◽  
Large Spherical

Two prokaryotic microorganisms were observed in the erythrocytes of frogs in a survey of blood parasites of six species of amphibians from a sphagnum bog adjacent to Lake Sasajewun, Algonquin Park, Ontario. A cytoplasmic virus was observed in 12 of 75 Rana catesbeiana and 1 of 75 Rana septentrionalis. The virus particles were hexagonal in section, measured 300–370 nm in diameter, and occurred in groups that were often surrounded by lamellar arrays of stacked membranes. Large spherical inclusions were seen in the erythrocytes of 2 of 57 Rana clamitans. In the electron microscope these inclusions were found to contain numerous rod-shaped prokaryotes which measured 1–1.7 μm × 200–300 nm. These organisms were ultrastructurally indistinguishable from rickettsiae.

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