The early development of Ambystoma macrodatylum baird, with emphasis on the larval stages Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3b591c92q

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  • The embryonic and larval stages of the long-toed salamander, Ambystoma macrodactylum are described from fertilization through the development of five toes on the posterior limbs. New stage numbers are employed in the description of the hind limb. The eggs used in the study were obtained by the injection of pituitary glands into mature female salamanders in order to stimulate them to ovulate. Fair numbers of eggs are secured in this manner if the salamanders are injected within four months after being collected. However, if injected four and one-half to five months after collection, they are found to be non-productive. The embryonic development rate of Ambystoma macrodactylum appears to be slower than northern forms such as A. tigrinum, A. jeffersonianum, and A. maculatum but faster than A. opacum, a more southern form. However, the range of A. macrodactylum extends farther north than any of the others. A comparison of larval development as length increases shows that A. macrodactylum reaches a state of full development with respect to limb development at a lesser total length than do A. opacum and A. jeffersonianum but at a greater length than does A. maculatum. Pigmentation in laboratory-reared larvae is found to be lighter in color than that exhibited by A. macrodactylum larvae collected in the field. However, the same general pattern remains constant. The use of the number of gill rakers in determining the species of a larval ambystomatid is found to be unreliable unless the stage of the larva is known. The correlation of body dimensions at various stages of development to geographic distribution and to other species for identification purposes is not feasible until similar information for other locations and other species is obtained.
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  • File scanned at 300 ppi using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-04-29T15:03:59Z (GMT) No. of bitstreams: 1 HollenbeckRobertR1966_Redacted.pdf: 933380 bytes, checksum: 677db03b026b5db991b0a5f04b504caf (MD5)
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  • description.provenance : Submitted by Alex McFerrin (amscannerosu@gmail.com) on 2014-04-29T00:26:19Z No. of bitstreams: 1 HollenbeckRobertR1966_Redacted.pdf: 933380 bytes, checksum: 677db03b026b5db991b0a5f04b504caf (MD5)
  • description.provenance : Made available in DSpace on 2014-04-30T18:14:50Z (GMT). No. of bitstreams: 1 HollenbeckRobertR1966_Redacted.pdf: 933380 bytes, checksum: 677db03b026b5db991b0a5f04b504caf (MD5) Previous issue date: 1966-02-11

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