Studies on Amphibian Activity. I. Preliminary Report on the Rhythmic Activity of Bufo Americanus Americanus Holbrook, and Bufo Fowleri Hinckley

Ecology ◽  
1939 ◽  
Vol 20 (1) ◽  
pp. 58-70 ◽  
Author(s):  
A. Curtis Higginbotham
Keyword(s):  
Preliminary Report ◽  
Rhythmic Activity ◽  
Bufo Americanus ◽  
Bufo Fowleri

The Original Descriptions of Bufo fowleri and Bufo americanus

Copeia ◽  
1931 ◽  
Vol 1931 (3) ◽  
pp. 94 ◽  
Author(s):  
George S. Myers
Keyword(s):  
Bufo Americanus ◽  
Bufo Fowleri

Investigating opposing patterns of character displacement in release and advertisement vocalizations of Bufo fowleri and Bufo americanus (Anura; Bufonidae)

2001 ◽  
Vol 79 (9) ◽  
pp. 1577-1585 ◽  
Author(s):  
Christopher J Leary
Keyword(s):  
Hybrid Zone ◽  
Mate Recognition ◽  
Character Displacement ◽  
Dominant Frequency ◽  
Species Group ◽  
Bufo Americanus ◽  
Premating Isolation ◽  
Rapid Release ◽  
Bufo Fowleri

Anuran release vocalizations function to prevent prolonged amplexus between males, whereas advertisement vocalizations potentially act as a premating isolation mechanism. To facilitate rapid release during heterospecific amplexus, selection should favor convergent character displacement in release vocalizations. Conversely, to promote isolation between sympatric congeners, selection should favor divergent character displacement in advertisement vocalizations. I examined properties of release and advertisement vocalizations of Bufo fowleri and Bufo americanus that are important in mate recognition (periodicity and dominant frequency) to determine if the two calls exhibit opposing patterns of character displacement. Release vocalizations showed no pattern of displacement. The periodicity of sympatric advertisement vocalizations differed from that of allopatric vocalizations for B. americanus but not for B. fowleri. However, the results were not consistent with the pattern expected for divergent character displacement because the two species differed in this parameter in allopatry. These results are compared with published reports of char acter displacement in the B. americanus species-group in the context of a possible mosaic hybrid zone for these species.

Progress report on 21-cm observations at low latitude between longitudes (l 11) 0° and 66°

1967 ◽  
Vol 31 ◽  
pp. 177-179
Author(s):  
W. W. Shane
Keyword(s):  
Preliminary Report ◽  
Progress Report ◽  
Galactic Centre ◽  
Low Latitude ◽  
The Third ◽  
Introductory Lecture ◽  
Centre Region

In the course of several 21-cm observing programmes being carried out by the Leiden Observatory with the 25-meter telescope at Dwingeloo, a fairly complete, though inhomogeneous, survey of the regionl11= 0° to 66° at low galactic latitudes is becoming available. The essential data on this survey are presented in Table 1. Oort (1967) has given a preliminary report on the first and third investigations. The third is discussed briefly by Kerr in his introductory lecture on the galactic centre region (Paper 42). Burton (1966) has published provisional results of the fifth investigation, and I have discussed the sixth in Paper 19. All of the observations listed in the table have been completed, but we plan to extend investigation 3 to a much finer grid of positions.

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