Variation in a Large Brood of the Mexican Water Snake, Natrix valida valida (Kennicott) in Sinaloa

1965 ◽  
Vol 10 (2) ◽  
pp. 140
Author(s):  
James R. Dixon
Keyword(s):  
Water Snake ◽  
Large Brood

Prothrombin-Activator (Thromboplastin) Generation in the Blood of Water Snake (Natrix piscator)

1981 ◽  
Vol 46 (04) ◽  
pp. 747-748
Author(s):  
V M Srivastava ◽  
B Dube ◽  
R K Dube ◽  
G P Agarwal
Keyword(s):  
Comparative Studies ◽  
One Stage ◽  
Water Snake ◽  
Generation Test ◽  
Mammalian System

SummaryThe generation of prothrombin-activator (thromboplastin) in water snake (Natrix piscator) is clearly delayed, Compared to a mammalian system, but the final activity is well comparable to that in man, when homologous sources of “phospholipid” (erythrocyte-lysate) and of substrate plasma are employed in one stage “thromboplastin generation test”. The use of heterologous source of either of the above reagents resulted in significantly longer clotting times; hence the need for homologous source of above reagents in the test is emphasized for comparative studies on animal haemostasis.

Ontogeny of Water Snake Foraging Ecology

Ecology ◽  
1982 ◽  
Vol 63 (6) ◽  
pp. 1624 ◽  
Author(s):  
Henry R. Mushinsky ◽  
James J. Hebrard ◽  
Darrell S. Vodopich
Keyword(s):  
Foraging Ecology ◽  
Water Snake

W chromosome in the Indian water snake (checkered keel back)Natrix piscator (colubridae)

1968 ◽  
Vol 24 (1) ◽  
pp. 79-80 ◽  
Author(s):  
L. Singh ◽  
T. Sharma ◽  
S. P. Ray-Chaudhuri
Keyword(s):  
W Chromosome ◽  
Indian Water ◽  
Water Snake

Diet of the large water snake Hydrodynastes gigas (Colubridae) from northeast Argentina

2004 ◽  
Vol 25 (2) ◽  
pp. 178-184 ◽  
Author(s):  
María Soledad López ◽  
Alejandro Giraudo
Keyword(s):  
Water Snake ◽  
Large Water

Effect of pinealectomy on the testicular response of the freshwater snake Natrix piscator to different environmental factors

1989 ◽  
Vol 67 (10) ◽  
pp. 2352-2357 ◽  
Author(s):  
C. Haldar ◽  
R. Pandey
Keyword(s):  
High Temperature ◽  
Pineal Gland ◽  
High Humidity ◽  
Testicular Function ◽  
Experimental Conditions ◽  
Gland Weight ◽  
Tropical Water ◽  
Water Snake ◽  
Temperature Regimes ◽  
Testicular Weight

The effects of different humidity, photoperiod, and temperature regimes on the testicular function of the tropical water snake Natrix piscator were investigated in both sham-operated and pinealectomized snakes. Moderate humidity (50 ± 5%) had no effect on the testis, but high humidity (85 ± 5%) increased the testicular weight and activity of sham-operated snakes after 3, 6, and 9 weeks. Exposures to 14L:10D or 24L:0D and high temperature (42 ± 2 °C) inhibited testicular weight and activity in sham-operated snakes, whereas exposure to 10L:14D or 0L:24D and a low temperature (20 ± 2 °C) had no effect. Pinealectomized snakes did not respond to any of these experimental conditions, but their testicular weight remained the same as that of the pinealectomized controls under natural environmental conditions. The pineal gland showed an opposite response to that of the testes. Pineal gland weight decreased under high humidity and increased under 14L:10D, 24L:0D, and high temperature. These findings suggest that the ecofactors humidity, photoperiod, and temperature play a role in the regulation of testicular function in this snake, and that the pineal gland is implicated in the mediation of these factors.

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