Skip to Main Content
Determining sex and life stage of Del Norte salamanders from external cuesAuthor(s): Lisa Ollivier; Hartwell H. Welsh Jr
Source: Northwestern Naturalist, Vol. 84: 129-134
Publication Series: Miscellaneous Publication
PDF: View PDF (440 KB)
DescriptionLife stage determination for many western plethodontids often requires dissection of the specimen. Availability of reliable external measures that could be applied under field conditions would enhance future studies of the genus Plethodon. We examined preserved specimens of the Del Norte Salamander, Plethodon elongatus, taken from 11 sites in northwestern California and southwestern Oregon. During the dissections, we recorded several external body characteristics that could prove useful in determining the life stage and gender of individuals. Identification of life stage is possible by using several external measurements. A discriminant function model including snout vent length, weight, head length, and width correctly classified life stage 92% of the time. A tree-based classification analysis identified snout-vent length as a single variable that could correctly classify life stage 90.2% of the time. We also have identified a sexually dimorphic character for adults, vent pattern and coloration, that can reliably distinguish gender at any time of year.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationOllivier, Lisa; Welsh Jr, Hartwell H. 2003. Determining sex and life stage of Del Norte salamanders from external cues. Northwestern Naturalist, Vol. 84: 129-134
KeywordsPlethodon elongatus, Del Norte salamander, morphometrics, tree-based classification, gender determination, life stage determination
- Diet of the Del Norte Salamander (Plethodon elongatus): Differences by age, gender, and season.
- Developing and applying habitat models using forest inventory data: an example using a terrestrial salamander
- Newly discovered populations of salamanders from Siskiyou County California represent a species distinct from Plethodon Stormi.
XML: View XML