The effects of several environmental variables on reproduction and growth of the San Marcos salamander in laboratory culture

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dc.contributor.authorWise, Martn R.
dc.date.accessioned2022-10-07T13:31:29Z
dc.date.available2022-10-07T13:31:29Z
dc.date.issued1999-05
dc.description.abstractThree 84-d experiments were conducted at the San Marcos National Fish Hatchery and Technology Center on the San Marcos salamanders Eurycea nana in an attempt to isolate factors that may be necessary for reproduction. Because these salamanders often are found in association with spring openings with upwelling water, vegetation, and because they appear to have an unequal sex ratio in the wild, the factors tested were access to a tube with upwelling water, the presence of vegetation,, and different sex ratios. In the upwelling experiment, there was no significant increase in growth measured by length or weight either over time or between treatments. Also, there was no deposition of eggs in the upwelling experiment. In the vegetation experiment, the male salamanders in aquaria with vegetation demonstrated greater mean weight after the first month (P=0.00583), the second month (P=0.00950) and the third month (P=0.01621) and greater mean length after the second month (P=0.01738) and the third month (P=0.01545) than those without vegetation. One deposition of eggs occurred in an aquarium with vegetation. In the sex ratio experiment, the male salamanders in the majority male aquaria had significantly(P=0.00058) higher growth in mean weight over time.
dc.description.departmentBiology
dc.formatText
dc.format.extent73 pages
dc.format.medium1 file (.pdf)
dc.identifier.citationWise, M. R. (1999). The effects of several environmental variables on reproduction and growth of the San Marcos salamander in laboratory culture (Unpublished thesis). Southwest Texas State University, San Marcos, Texas.
dc.identifier.urihttps://hdl.handle.net/10877/16193
dc.language.isoen
dc.subjectreproduction
dc.subjectbrook salamanders
dc.subjectsalamanders
dc.subjectwater chemistry
dc.subjectvegetation
dc.subjectsex ratio
dc.titleThe effects of several environmental variables on reproduction and growth of the San Marcos salamander in laboratory culture
dc.typeThesis
thesis.degree.departmentBiology
thesis.degree.disciplineEnvironmental Sciences
thesis.degree.grantorSouthwest Texas State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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