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Growth of Clethrionomys gapperi and Microtus pennsylvanicus in captivity
Abstract:
Growth of Clethrionomys gapperi and Microtus pennsylvanicus from southern Manitoba was documented from birth to 30 days. Clethrionomys gapperi were smaller and grew more slowly (g/day) than M. pennsylvanicus, although both species were weaned at the same age. There were significant differences in growth rates between sexes in M. pennsylvanicus and among litter sizes in both species. Most of the variability in growth was due to differences among litters. The patterns of development was similar to those reported for other North American species of Clethrionomys and Microtus.
Insights
This study tracked the growth of red-backed voles (Clethrionomys gapperi) and prairie voles (Microtus pennsylvanicus) from birth to 30 days. Prairie voles grew faster than red-backed voles, with litter size impacting growth rates in both species.
Area of Science:
- Ecology
- Zoology
- Mammalogy
Background:
- Understanding small mammal population dynamics is crucial for ecological studies.
- Comparative growth data provides insights into species-specific life history strategies.
Purpose of the Study:
- To document and compare the early growth patterns of Clethrionomys gapperi and Microtus pennsylvanicus.
- To identify factors influencing growth rates, such as species, sex, and litter size.
Main Methods:
- Growth of Clethrionomys gapperi and Microtus pennsylvanicus was monitored from birth to 30 days.
- Measurements included weight gain (g/day) and age at weaning.
- Statistical analyses were performed to assess differences between species, sexes, and litter sizes.
Main Results:
- Clethrionomys gapperi exhibited slower growth rates and smaller body size compared to Microtus pennsylvanicus.
- Both species were weaned at a similar age.
- Significant variations in growth rates were observed between sexes in M. pennsylvanicus and among different litter sizes for both species.
- Litter size was identified as a major contributor to growth variability.
Conclusions:
- Early development patterns in these Manitoba populations are consistent with other North American Clethrionomys and Microtus species.
- Litter size plays a significant role in modulating early growth in these vole species.
- Comparative growth analysis highlights interspecific differences in life history traits.