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Operant Conditioning In The Water Snake (Nerodia Sipedon), Angela R. Deitz
Operant Conditioning In The Water Snake (Nerodia Sipedon), Angela R. Deitz
Masters Theses
Six subjects of Nerodia sipedon were tested for runway acquisition. Five of six subjects met criterion for runway learning, demonstrating a significant decrease over the 25 day testing period in mean latency and running times. Four subjects completed 170 trials in a T-maze to test two-choice discrimination and reversal learning. All subjects met criterion for the initial discrimination and one reversal while two subjects completed four reversals and one subject met criterion for six reversals. Results are similar or superior to those previously reported for reptiles and other non-human vertebrates.
Use Of Skelettochronology In Age Determination Of American Toads (Bufo Americanus) From East Central Illinois, Philip M. Acker
Use Of Skelettochronology In Age Determination Of American Toads (Bufo Americanus) From East Central Illinois, Philip M. Acker
Masters Theses
A skelettochronological technique was applied to the phalanges of the American toad, Bufo americanus, from east central, IL. In hematoxylin-stained cross-sections of the phalanges, suspected year rings are formed which can be used to age individuals. This method allows for aging without destructive sampling of toad populations.
A majority of the male toads from two choruses were estimated to be 2 or 3 years old, while most of the females from the same two sites were in the 3 or 4 year age class. Females were larger than males in the 3 and 4 year age classes, and overall, …
Observations On Relationships Between Limb Measurements And Mode Of Locomotion In Malaysian Turtles, Duayne Nyckel
Observations On Relationships Between Limb Measurements And Mode Of Locomotion In Malaysian Turtles, Duayne Nyckel
Masters Theses
Twelve Genera (spanning three Families) of Malaysian Turtles were studied to determine whether bone lengths could be correlated to mode of locomotion. Ulna, humerus, tibia, femur, coracoid (among others) were measured and results were presented graphically. Five of the genera were observed singly in a large aquarium. Data were recorded on the amount of time each spent in different locomotor modes. Both limb length data and aquarium observations suggest that turtles can be grouped into three main locomotor habits (i.e. terrestrial walking, bottomwalking, and swimming). The terrestrial group includes the genera, Geochelone, Kinixys, and Gopherus. Bottomwalkers include …