Persistent Link:
http://hdl.handle.net/10150/187624
Title:
REPRODUCTIVE STRATEGY OF GERBILLINE RODENTS IN MOROCCO.
Author:
NORMAN, HARRY LEE.
Issue Date:
1983
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
This investigation of the reproductive strategy of Gerbilline rodents is based on field studies conducted in southwestern Morocco, in the arid zone of North Africa. A mark-recapture method was used on live trap grids established at two locations. Demographic and reproductive data were recorded with each capture. Snap trap lines were used to obtain specimens for necropsy studies on the internal reproductive organs. Growth and development were observed on individuals raised in the laboratory. Monthly changes in population density, species biomass and percentage of reproductive activity were analyzed for three gerbilline species: Gerbillus hesperinus, G. campestris and G. nanus. Those changes were compared to monthly variations in rainfall, temperature photoperiod, and population density. Correlation between periods of high precipitation and increasing percentages of reproductive activity were found in all three species. The percentage of G. hesperinus and G. nanus females reproductively active increased markedly 2-3 months after periods of high precipitation. Although a similar interval was observed in G. campestris, the correlation was more closely associated with long-term rainfall patterns. The 2-3 month interval suggests a relationship to primary productivity rather than actual rainfall. The percentage of reproductively active males reached the highest levels earlier than in females and remained high for a longer period of time. During optimal conditions all three species exhibited characteristics associated with r-strategists. These characteristics include early female reproductive maturity, multiple litters in a single reproductive season and relatively large litters.
Type:
text; Dissertation-Reproduction (electronic)
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Ecology and Evolutionary Biology; Graduate College
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleREPRODUCTIVE STRATEGY OF GERBILLINE RODENTS IN MOROCCO.en_US
dc.creatorNORMAN, HARRY LEE.en_US
dc.contributor.authorNORMAN, HARRY LEE.en_US
dc.date.issued1983en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThis investigation of the reproductive strategy of Gerbilline rodents is based on field studies conducted in southwestern Morocco, in the arid zone of North Africa. A mark-recapture method was used on live trap grids established at two locations. Demographic and reproductive data were recorded with each capture. Snap trap lines were used to obtain specimens for necropsy studies on the internal reproductive organs. Growth and development were observed on individuals raised in the laboratory. Monthly changes in population density, species biomass and percentage of reproductive activity were analyzed for three gerbilline species: Gerbillus hesperinus, G. campestris and G. nanus. Those changes were compared to monthly variations in rainfall, temperature photoperiod, and population density. Correlation between periods of high precipitation and increasing percentages of reproductive activity were found in all three species. The percentage of G. hesperinus and G. nanus females reproductively active increased markedly 2-3 months after periods of high precipitation. Although a similar interval was observed in G. campestris, the correlation was more closely associated with long-term rainfall patterns. The 2-3 month interval suggests a relationship to primary productivity rather than actual rainfall. The percentage of reproductively active males reached the highest levels earlier than in females and remained high for a longer period of time. During optimal conditions all three species exhibited characteristics associated with r-strategists. These characteristics include early female reproductive maturity, multiple litters in a single reproductive season and relatively large litters.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineEcology and Evolutionary Biologyen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.identifier.proquest8405506en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.