The purpose of this project was to investigate the taxonomic relationship and the biology of Peromyscus eremicus, and the Peromyscus guardia group of mice from islands in the Gulf of California.
Hybridization experiments were conducted between P. eremicus and P. interparietalis ryckmani. They were interfertile and produced fertile hybrids. Peromyscus guardia did not breed in the laboratory.
Body and skull measurements for P. eremicus, P. interparietalis ryckmani, and their F1 hybrids were analyzed by computing the discriminant functions and plotting a canonical scattergram. Peromyscus interparietalis ryckmani is quite distinct from P. eremicus. The hybrids were larger than either parent and resembled their maternal progenitor more than their paternal progenitor.
Blood proteins of P. eremicus, P. interparietalis, and P. guardia were compared by serum electrophoresis, and from the protein patterns the discriminant functions were computed and a canonical scattergram plotted. Peromyscus interparietalis is similar to P. eremicus, and P. guardia is quite different from both of them. Within a species, the subspecies showed similar patterns. Serum proteins appear to be a useful taxonomic character.
The pattern of growth and development is similar in P. eremicus and P. interparietalis with a few consistent differences.
","abstract_html":"<p>The purpose of this project was to investigate the taxonomic relationship and the biology of Peromyscus eremicus, and the Peromyscus guardia group of mice from islands in the Gulf of California.</p> <p>Hybridization experiments were conducted between P. eremicus and P. interparietalis ryckmani. They were interfertile and produced fertile hybrids. Peromyscus guardia did not breed in the laboratory.</p> <p>Body and skull measurements for P. eremicus, P. interparietalis ryckmani, and their F<sub>1</sub> hybrids were analyzed by computing the discriminant functions and plotting a canonical scattergram. Peromyscus interparietalis ryckmani is quite distinct from P. eremicus. The hybrids were larger than either parent and resembled their maternal progenitor more than their paternal progenitor.</p> <p>Blood proteins of P. eremicus, P. interparietalis, and P. guardia were compared by serum electrophoresis, and from the protein patterns the discriminant functions were computed and a canonical scattergram plotted. Peromyscus interparietalis is similar to P. eremicus, and P. guardia is quite different from both of them. Within a species, the subspecies showed similar patterns. Serum proteins appear to be a useful taxonomic character.</p> <p>The pattern of growth and development is similar in P. eremicus and P. interparietalis with a few consistent differences.</p>","abstract_has_math":false,"creators":["Brand, Leonard R."],"institution":null,"degree_name":"Master of Arts (MA)","degree_level":"Thesis","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Raymond E. Ryckman","Earl W. Lathrop","Gayle H. Nelson","Ian M. Fraser"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1966,"date_issued":"1966-06-01T07:00:00Z","date_published":"1966-06-01T07:00:00Z","updated_at":"2026-07-24T02:52:59Z","subjects":["Biology","Mice -- Mexico, Gulf of -- Research; Mice -- Classification"],"languages":["English"],"rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsrepository.llu.edu/etd/655","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Raymond E. Ryckman","Earl W. Lathrop","Gayle H. Nelson","Ian M. Fraser"]},{"key":"dc:creator","label":"Author","values":["Brand, Leonard R."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Biology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Arts (MA)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Biology","Mice -- Mexico, Gulf of -- Research; Mice -- Classification"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsrepository.llu.edu/etd/655"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The purpose of this project was to investigate the taxonomic relationship and the biology of Peromyscus eremicus, and the Peromyscus guardia group of mice from islands in the Gulf of California.
Hybridization experiments were conducted between P. eremicus and P. interparietalis ryckmani. They were interfertile and produced fertile hybrids. Peromyscus guardia did not breed in the laboratory.
Body and skull measurements for P. eremicus, P. interparietalis ryckmani, and their F1 hybrids were analyzed by computing the discriminant functions and plotting a canonical scattergram. Peromyscus interparietalis ryckmani is quite distinct from P. eremicus. The hybrids were larger than either parent and resembled their maternal progenitor more than their paternal progenitor.
Blood proteins of P. eremicus, P. interparietalis, and P. guardia were compared by serum electrophoresis, and from the protein patterns the discriminant functions were computed and a canonical scattergram plotted. Peromyscus interparietalis is similar to P. eremicus, and P. guardia is quite different from both of them. Within a species, the subspecies showed similar patterns. Serum proteins appear to be a useful taxonomic character.
The pattern of growth and development is similar in P. eremicus and P. interparietalis with a few consistent differences.
"]},{"key":"dc:title","label":"Title","values":["Biosystematics and Life Histories of the PEROMYSCUS GUARDIA Group of Mice and PEROMYSCUS EREMICUS (Rodentia: Cricetidae)"]}]}],"canonical_facts":{"dc:contributor":["Raymond E. Ryckman","Earl W. Lathrop","Gayle H. Nelson","Ian M. Fraser"],"dc:creator":["Brand, Leonard R."],"dc:description.abstract":["The purpose of this project was to investigate the taxonomic relationship and the biology of Peromyscus eremicus, and the Peromyscus guardia group of mice from islands in the Gulf of California.
Hybridization experiments were conducted between P. eremicus and P. interparietalis ryckmani. They were interfertile and produced fertile hybrids. Peromyscus guardia did not breed in the laboratory.
Body and skull measurements for P. eremicus, P. interparietalis ryckmani, and their F1 hybrids were analyzed by computing the discriminant functions and plotting a canonical scattergram. Peromyscus interparietalis ryckmani is quite distinct from P. eremicus. The hybrids were larger than either parent and resembled their maternal progenitor more than their paternal progenitor.
Blood proteins of P. eremicus, P. interparietalis, and P. guardia were compared by serum electrophoresis, and from the protein patterns the discriminant functions were computed and a canonical scattergram plotted. Peromyscus interparietalis is similar to P. eremicus, and P. guardia is quite different from both of them. Within a species, the subspecies showed similar patterns. Serum proteins appear to be a useful taxonomic character.
The pattern of growth and development is similar in P. eremicus and P. interparietalis with a few consistent differences.
"],"dc:identifier":["https://scholarsrepository.llu.edu/etd/655"],"dc:language":["English"],"dc:rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"dc:subject":["Biology","Mice -- Mexico, Gulf of -- Research; Mice -- Classification"],"dc:title":["Biosystematics and Life Histories of the PEROMYSCUS GUARDIA Group of Mice and PEROMYSCUS EREMICUS (Rodentia: Cricetidae)"],"thesis:degree_discipline":["Biology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Arts (MA)"]},"updated_at":"2026-07-24T02:52:59Z"}