The Spermatophore of the Small-Mouthed Salamander, Ambystoma texanum (Amphibia, Urodela, Ambystomatidae)

1978 ◽  
Vol 12 (1) ◽  
pp. 111 ◽  
Author(s):  
George M. Labanick ◽  
George T. Davis
Keyword(s):  
Ambystoma Texanum

Spermatophores of the salamander Ambystoma texanum

1981 ◽  
Vol 13 (3) ◽  
pp. 609-621 ◽  
Author(s):  
Lonnie D. Russell ◽  
Ronald A. Brandon ◽  
Edward J. Zalisko ◽  
J. Martan
Keyword(s):  
Ambystoma Texanum

Courtship Behavior of the Small-Mouthed Salamander (Ambystoma Texanum): the Effects of Conspecific Males On Male Mating Tactics

Behaviour ◽  
1992 ◽  
Vol 121 (1-2) ◽  
pp. 1-19 ◽  
Author(s):  
Scott R. McWilliams
Keyword(s):  
Geographic Variation ◽  
Sibling Species ◽  
Courtship Behavior ◽  
Male Mating ◽  
Mating Tactics ◽  
Defense Behavior ◽  
Large Numbers ◽  
Ambystoma Texanum ◽  
Sexual Interference ◽  
Intermale Competition

Abstract1. The courtship behavior of A. texanum consisted of a rapid nudging period followed by males producing many spermatophores, some of which were picked up by the female. Neither amplexus or leading by the male were integral components of courtship. Consequently, proposed geographic variation in A. texanum courtship remains unsubstantiated. 2. Courtship behavior of A. texanum and A. barbouri (formerly pond and stream form A. texanum, respectively) is very similar; only the location of courtship and perhaps the frequency of sexual interference tactics are different for these two sibling species. 3. A. texanum courtship is rapid, males produce large numbers of spermatophores per courtship and invest little courtship time per spermatophore, and intermale competition is extreme. 4. Male A. texanum promote their sexual success using sexual interference behavior (e.g. covering other spermatophores with their own) and to a lesser degree sexual defense behavior (e.g. forcefully nudging rival males). 5. Male sexual success is primarily enhanced directly - A. texanum males increase the number of spermatophores produced when at least two other males are courting the same female. The temporal allocation of these additional spermatophores is adaptive only if males are maximizing the number of ejaculates per female or breeding typically occurs in polygamous aggregations.

Electrophoretic identification of Ambystoma laterale and Ambystoma texanum as well as their diploid and triploid interspecific hybrids (Amphibia: Caudata) on Pelee Island, Ontario

1985 ◽  
Vol 63 (2) ◽  
pp. 340-347 ◽  
Author(s):  
James P. Bogart ◽  
Lawrence E. Licht ◽  
Michael J. Oldham ◽  
Stephen J. Darbyshire
Keyword(s):  
Interspecific Hybrids ◽  
Gene Dosage ◽  
Electrophoretic Analysis ◽  
Genetic Distances ◽  
Chromosome Counts ◽  
Triploid Female ◽  
Ambystoma Laterale ◽  
Ambystoma Texanum

Ambystoma salamanders from Pelee Island, Ontario, were compared with mainland populations of A. jeffersonianum, A. laterale, and A. texanum using erythrocyte area measurements, chromosome counts, and electrophoretic analysis of proteins coded by 32 loci. The mainland species are characterized by relatively low heterozygosity (H = 0.053–0.11) and high Nei's genetic distances (D = 0.896–1.067). Nine diagnostic loci were found in A. jeffersonianum and five in each of A. laterale and A. texanum. Two loci (SOD-1 and GOT-1) diagnose all three mainland species and provide gene dosage for assessing genome contributions of A. laterale and A. texanum in Pelee Island salamanders. Diploid and triploid female A. texanum × A. laterale hybrids as well as A. laterale and A. texanum occur on Pelee Island.

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