Документ взят из кэша поисковой машины. Адрес оригинального документа : http://vertebrata.bio.msu.ru/Individual_Project_Cranberry_2008.pdf Дата изменения: Mon Feb 8 19:41:35 2010 Дата индексирования: Mon Oct 1 19:37:52 2012 Кодировка:

Reaction of juvenile american toads, Bufo americanus, on chemical cues from predators, Garter snake, Thamnophis sirtalis sirtalis
Osipova Ola 2008


Aim of the study To find out whether juvenile toads recognize the smell of the predator We put forward the following questions: Do toads move away from the smell of the Garter snake? Could toads choose left or right side of the maze in experiment notwithstanding the position of odorant?


Methods
36.8 cm

24.8 cm

Paper with smell of Garter snake

Area of smell

center

Area without smell

Paper without smell of Garter snake


Methods

Paper without smell of Garter snake

center Area Area without without smell smell

Paper without smell of Garter snake


We used 15 juvenile toads Bufo americanus (the age was nearly 1-2 years old)

We used paper with the smell of Garter snakes, which were not fed


Results
P= p=0.17

Toad choice of compartments in the control experiment


Results
p=0.0001

Toad choice in compartments in the experiment with the presentce of the smell of Garter snake


conclusion
In our any side experiments toads didn't show preference for the left or right of the maze

We observed that juvenile toads rejected the place where the odor of the predator Garter snake was present


Discussion Juvenile toads afraid of the chemical stimuli of snakes, which could be dangerous for toads in their habitats We could assume that these chemical stimuli are perceived by means of olfaction


Thank you for attention

Sorry for my English