Effects of Early Feeding Experience on Chemical Preference of the Northern Water Snake, Natrix s. sipedon (Reptilia, Serpentes, Colubridae)

1979 ◽  
Vol 13 (2) ◽  
pp. 165 ◽  
Author(s):  
Gary L. Dunbar
Keyword(s):  
Early Feeding ◽  
Feeding Experience ◽  
Water Snake ◽  
Northern Water Snake

The effect of early feeding experience on signal-directed response topography in the rat

1984 ◽  
Vol 32 (1) ◽  
pp. 11-15 ◽  
Author(s):  
Graham C.L. Davey ◽  
Gary G. Cleland ◽  
David A. Oakley ◽  
Janet L. Jacobs
Keyword(s):  
Response Topography ◽  
Early Feeding ◽  
Feeding Experience

Waking at night: the effect of early feeding experience

1983 ◽  
Vol 9 (6) ◽  
pp. 309-319 ◽  
Author(s):  
PETER WRIGHT ◽  
HAMISH A. MACLEOD ◽  
MYRA J. COOPER
Keyword(s):  
Early Feeding ◽  
Feeding Experience

Effects of early feeding experience and age on the cannibalistic propensity of the land snail Arianta arbustorum

1987 ◽  
Vol 65 (12) ◽  
pp. 3068-3070 ◽  
Author(s):  
Bruno Baur
Keyword(s):  
Land Snail ◽  
Early Feeding ◽  
Vegetable Food ◽  
Egg Cannibalism ◽  
Feeding Experience ◽  
Arianta Arbustorum ◽  
Genetically Determined

The influence of early feeding experience on egg cannibalism was examined in hatchlings of the land snail Arianta arbustorum. The propensity for cannibalism was not affected by cannibalistic or by vegetarian early feeding experience. It was, however, negatively correlated with the age of the snails. Freshly hatched snails with no prior feeding experience chose eggs exclusively, while 16-day-old snails preferred vegetable food. Furthermore, the cannibalistic propensity varied between offspring from different clutches. Restriction of the cannibalistic propensity to the hatchling stage, its nonmodifiability, and differences in its extent between clutches suggest that egg cannibalism in A. arbustorum is a genetically determined trait.

Variation in offspring sex ratios in the northern water snake (Nerodia sipedon)

1998 ◽  
Vol 76 (12) ◽  
pp. 2200-2206 ◽  
Author(s):  
Patrick J Weatherhead ◽  
Gregory P Brown ◽  
Melanie R Prosser ◽  
Kelley J Kissner
Keyword(s):  
Sex Ratio ◽  
Sex Ratios ◽  
Birth Date ◽  
Nerodia Sipedon ◽  
Water Snake ◽  
In Captivity ◽  
Northern Water Snake ◽  
Northern Water Snakes ◽  
Gravid Females ◽  
Water Snakes

We used data from 88 litters of northern water snakes (Nerodia sipedon) to test predictions about how mothers would adaptively vary the sex ratios of their offspring. Larger mothers produced significantly more daughters (r2 = 0.04, P = 0.05), and mothers producing larger offspring produced significantly more daughters (r2 = 0.06, P = 0.02). Because neonate size did not vary with maternal size, these sex-ratio patterns were independent of each other. These patterns were more pronounced for wild females than for females maintained in captivity while gravid, but rearing conditions did not have a significant effect on sex ratio. Also, because sex ratios were similar between captive and free-living females despite captive females giving birth 16 days earlier, on average, and because sex ratios did not vary with birth date within the two groups of females, gestation appeared not to affect sex ratio. If females vary sex ratios adaptively, only the relationship between sex ratio and neonate size was consistent with our predictions. Limited evidence from other snake species also indicates variation in neonatal sex ratios that is nonrandom but not necessarily adaptive. A better understanding of these patterns will require information on the factors that affect the fitness of male and female neonates differently. An unexpected sex-ratio pattern that we found was that 14 of 19 stillborn young were male. We speculate that this pattern could be a result of male embryonic sensitivity to temperature. Thus, the need for gravid females to maintain a high body temperature so that their young are born with enough time to find hibernation sites may conflict with the need for embryos to develop at a safe temperature.

Sex ratios, mating behavior and sexual size dimorphism of the northern water snake, Nerodia sipedon

1995 ◽  
Vol 36 (5) ◽  
pp. 301-311 ◽  
Author(s):  
Patrick J. Weatherhead ◽  
Frances E. Barry ◽  
Gregory P. Brown ◽  
Mark R. L. Forbes
Keyword(s):  
Mating Behavior ◽  
Sexual Size Dimorphism ◽  
Sex Ratios ◽  
Nerodia Sipedon ◽  
Size Dimorphism ◽  
Water Snake ◽  
Northern Water Snake

Effect of early feeding experience on subsequent prey preference by cuttlefish,Sepia officinalis

2004 ◽  
Vol 45 (4) ◽  
pp. 239-244 ◽  
Author(s):  
Anne-Sophie Darmaillacq ◽  
Raymond Chichery ◽  
Roseline Poirier ◽  
Ludovic Dickel
Keyword(s):  
Prey Preference ◽  
Sepia Officinalis ◽  
Early Feeding ◽  
Feeding Experience

Sex ratios, mating behavior and sexual size dimorphism of the northern water snake, Nerodia sipedon

1995 ◽  
Vol 36 (5) ◽  
pp. 301-311 ◽  
Author(s):  
P. J. Weatherhead ◽  
Frances E. Barry ◽  
Gregory P. Brown ◽  
M. R. L. Forbes
Keyword(s):  
Mating Behavior ◽  
Sexual Size Dimorphism ◽  
Sex Ratios ◽  
Nerodia Sipedon ◽  
Size Dimorphism ◽  
Water Snake ◽  
Northern Water Snake
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