The Spinifex hopping mouse(Notomys alexis Thomas,1922)is an arid adapted Australo–Papuan old endemic rodent that undergoes boom and bust population cycles.In this communication,we review our findings on the timing of...The Spinifex hopping mouse(Notomys alexis Thomas,1922)is an arid adapted Australo–Papuan old endemic rodent that undergoes boom and bust population cycles.In this communication,we review our findings on the timing of reproduction and the potential reproductive rate of this species.To investigate the first question,the reproductive condition of adult females,and occurrence of immatures,in a population on a cattle station in central Australia was determined and,for the second,data from a laboratory colony compared to those previously published on closely related species in other environments.The findings show that,at least in the population at the times that monitoring was performed,reproductive activity was only taking place in spring and early summer,whereas the laboratory study indicates that females have a similar gestation length and litter size to those of most close relatives occurring in other environments.Males have extremely small testes and store relatively few sperm.The findings suggest that Notomys alexis might show some seasonality of reproduction at least in this region of central Australia and that this species does not have a higher reproductive rate than that of related species in other,more predictable,environments.展开更多
基金The field trips were funded by grants from the Australian Research Council(ARC),with the University of Adelaide,in part,financially supporting the colony of animalsSouth Australian National Parks and Wildlife Service Permit Number 05066 covered the maintenance of the breeding colony,which was performed under University of Adelaide Ethics Committee Permit Number M/66/90.
文摘The Spinifex hopping mouse(Notomys alexis Thomas,1922)is an arid adapted Australo–Papuan old endemic rodent that undergoes boom and bust population cycles.In this communication,we review our findings on the timing of reproduction and the potential reproductive rate of this species.To investigate the first question,the reproductive condition of adult females,and occurrence of immatures,in a population on a cattle station in central Australia was determined and,for the second,data from a laboratory colony compared to those previously published on closely related species in other environments.The findings show that,at least in the population at the times that monitoring was performed,reproductive activity was only taking place in spring and early summer,whereas the laboratory study indicates that females have a similar gestation length and litter size to those of most close relatives occurring in other environments.Males have extremely small testes and store relatively few sperm.The findings suggest that Notomys alexis might show some seasonality of reproduction at least in this region of central Australia and that this species does not have a higher reproductive rate than that of related species in other,more predictable,environments.
