The orientation and survival of neonate snapping turtles (Chelydra serpentina) were studied in 1986 and 1987. Orientation mechanisms were tested in an outdoor parabolic arena. These experiments suggested that positive geotaxis was a dominant cue directing neonate snapping turtles to water. / Hatchling survival and movement from nest to water were studied in Calumet, Quebec using isotope tagging. / A highly significant number of hatchlings (95%) released on sloped nest sites were positively geotactic. Hatchlings released on level ground moved in random directions. / Eighty-two percent of hatchlings from nests within 18 m of the shoreline were successful in reaching water. Incidence of mortality was greatest for hatchlings from nests between 121 and 165 m from water. Mortality resulted from vehicles and predation by bullfrogs (Rana catesbieana) and meadow voles (Microtus pennsylvanicus). / Female carapace length was positively correlated with clutch size and mean egg diameter. Egg diameters were positively correlated with hatchling weights. Clutch sizes of nests more than 100 m from water were larger than those closer to water.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.59252 |
| Date | January 1989 |
| Creators | Robinson, Candace |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Renewable Resources.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001070004, proquestno: AAIMM63441, Theses scanned by UMI/ProQuest. |
Page generated in 0.0018 seconds