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Responses of ecologically dissimilar populations of the water snakeNatrix s. sipedon to chemical cues from prey
Authors:Doris Gove  Gordon M Burghardt
Affiliation:(1) Departments of Zoology and Psychology, University of Tennessee, Knoxville, Tennessee
Abstract:Three populations of the water snake,Natrix s. sipedon, were tested for their responses to surface water extracts prepared from various prey species. It was clearly shown that these snakes can distinguish between different prey genera on the basis of chemical cues alone. Adult snakes caught at a fish hatchery where goldfish (Carassius auratus) were abundant responded most to goldfish extract, as did laboratory-born snakes reared on goldfish for one year. However, snakes caught in a relatively undisturbed mountain stream environment and naive young born to a mountain female responded more to the extracts of various sympatric-mountain fish and amphibians. The evidence indicates that newborn snakes have genetic predispositions for sympatric species of the classes of prey normally eaten. These preferences can be enhanced or inhibited during ontogeny.
Keywords:snakes  prey preference  chemical senses  Natrix  chemical cues  predator-prey  ecology  adaptation
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