Growth and Development of Pseudomys gracilicaudatus  (Rodentia: Muridae) in the Laboratory

Fox, BJ; Kemper, CM

doi:10.1071/zo9820175

Cited by 16 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is possible however, that the sample taken in December, which is characterized by a slight positive skewness, was more uniform with respect to age than the other samples, as some other data in this paper show that in this month only the individuals born in the current year can be present in the population. A similar situation is present in the case of abundant materials collected by Adamczewska-Andrzejewska (1959) for frequency distribution of individual weights in the field mouse Apodemus Jlavicollis and the striped field mouse Apodemus agrarius (Adamczewska-Andrzejewska 1973)- Fox & Kemper (1982) carried out laboratory experiments on the growth and development of the rodent Pseudomys gracilicaudatus. The growth curves presented by these authors not only include information about changes in the average weight, but also show that the dispersion of individual weights about the average value increases with age (figure 22).…”

Section: Length/cmmentioning

confidence: 53%

See 1 more Smart Citation

Differentiation and frequency distributions of body weights in plants and animals

Uchmański

1985

Phil. Trans. R. Soc. Lond. B

107

View full text Add to dashboard Cite

The basic and simplest system that one can consider in ecology is a group of individuals of equal age and representing one species, that is, a cohort. This paper is an attempt to show that analysis of such a system may be of great importance to understanding basic ecological problems, such as, intraspecific competition and the dynamics of a single population. It is easy to observe that in even-aged populations individuals differ in weights. A close look can show that weight distributions in even-aged populations may have different skewness. Most common are distributions with coefficients of skewness greater than zero. Sometimes weight distributions are symmetrical or with skewness coefficients less than zero. In a cohort of growing individuals the coefficient of skewness changes with time: most often starting from zero (symmetrical distribution), it increases in time; sometimes after an initial increase it can decrease in the final stage of growth, which is related to an increased mortality of individuals. The rate of change in skewness, and the skewness itself depend on the density of individuals in a cohort and on food conditions. They are greater at higher densities and increase with deteriorating food conditions. Weight distributions are symmetrical at low densities and optimal food conditions. The differences in individual weights measured by variance of weight distributions or coefficient of variation follow the same pattern, but observed changes with time, density and food conditions are not so clear. These conclusions rest upon the review of numerous papers concerning both plants and animals, which is presented in this paper. In the past, the properties of weight distributions in even-aged populations were explained not by interactions between individuals, but rather as a natural outcome of the growth process of non-interacting individuals. The exponential equation of growth, with relative growth rate having a normal distribution in populations, was used to support this hypothesis. Obtained weight distributions were of positive skewness; however, this model, which in fact is able to describe the growth process only in its initial stage, cannot explain the changes of skewness of weight distributions with density and food conditions. A model has been developed which includes competitive interactions among members of even-aged populations to explain observed properties of weight distributions in them. The basic assumption is that intraspecific competition leads to uneven partitioning of resources, which are the object of competition. Functions describing resource partitioning among individuals are included into the model.(ABSTRACT TRUNCATED AT 400 WORDS)

show abstract

Section: Length/cmmentioning

confidence: 53%

“…Changes of average body weight are indicated together with 95% confidence limits. (Redrawn fromFox & Kemper (1982). )…”

mentioning

confidence: 99%

Differentiation and frequency distributions of body weights in plants and animals

Uchmański

1985

Phil. Trans. R. Soc. Lond. B

107

View full text Add to dashboard Cite

show abstract

“…The species lives for <2 years in wild populations (Watts & Kemper ). Early development is rapid, which contrasts with a slow growth rate to reach maturity (Fox & Kemper ). Adults show significant sexual dimorphism (Fox & Kemper ) and attain average weights of 90 g for males and 75 g for females (Fox ).…”

Section: Methodsmentioning

confidence: 99%

Landscape genetics of an early successional specialist in a disturbance‐prone environment

et al. 2013

View full text Add to dashboard Cite

Species that specialize in disturbed habitats may have considerably different dispersal strategies than those adapted to more stable environments. However, little is known of the dispersal patterns and population structure of such species. This information is important for conservation because many postfire specialists are at risk from anthropogenic changes to natural disturbance regimes. We used microsatellite markers to assess the effect of landscape variation and recent disturbance history on dispersal by a small mammal species that occupies the early seral stage of vegetation regeneration in burnt environments. We predicted that a postfire specialist would be able to disperse over multiple habitat types (generalist) and not exhibit sex-biased dispersal, as such strategies should enable effective colonization of spatially and temporally variable habitat. We found significant differentiation between sites that fitted an isolation-by-distance pattern and spatial autocorrelation of multilocus genotypes to a distance of 2-3 km. There was no consistent genetic evidence for sex-biased dispersal. We tested the influence of different habitat- and fire-specific landscape resistance scenarios on genetic distance between individuals and found a significant effect of fire. Our genetic data supported recently burned vegetation having greater conductance for gene flow than unburnt habitat, but variation in habitat quality between vegetation types and occupied patches had no effect on gene flow. Postfire specialists must evolve an effective dispersal ability to move over distances that would ensure access to early successional stage vegetation. Natural disturbance and natural heterogeneity may therefore not influence population genetic structure as negatively as expected.

show abstract

“…Happold, 1976aM. Happold, 1976bFox & Kemper, 1982Watte, 1979Finlayson, 1941Kemper, 1976Taylor, 1961Prakash, Rana, & Jain, 1973Brambell & Davis, 1941Wirtz, 1973Taylor & Horner, 1973Taylor & Horner, 1973Johnston & Oliff, 1954Long & Evans, 1922Ewer, 1971Taylor & Horner, 1973Dwyer, 1975Brooks, 1982Birkenstock & Nel, 1977Watte, 1979Newson, 1966Coe, 1969Jarvis, 1969Emmons, 1979Conaway, 1968Emmons, 1979Emmons, 1979Viljoen, 1977Ognev, 1966Millar, 1970Quimby, 1951 Note. The presence (+) and absence (-) of postpartum estrus (PPE), lactational estrus (LE), and delayed implantation (DI) are noted when possible.…”

Section: Methodsmentioning

confidence: 99%

Postpartum and lactational estrus: A comparative analysis in rodentia.

Gilbert¹

1984

Journal of Comparative Psychology

View full text Add to dashboard Cite

Virgiri rodents exhibiting cycling estrus have traditionally been used for comparative studies of reproductive behavior. However estrus occurs in other life-history contexts, some of which differ from cycling estrus (CE) in that (a) the female is disposed to behave both maternally and sexually and (b) they result in litter overlap (i.e., the simultaneous gestation and lactation of two litters). In this report, two of these other modes of estrus are examined, with emphasis on their evolutionary and ecological implications. By means of a literature search of the order Rodentia, postpartum estrus (PPE) and lactational estrus (LE) were documented in 15 families, 71 genera, and 141 species. Analysis of these data showed that PPE and LE were nonrandomly distributed across taxa. They were statistically overrepresented in the family Cricetidae and underrepresented in squirrels (Sciuridae) and in pocket mice and kangaroo rats (Heteromyidae). Analysis of the phenotypes by which PPE and LE are achieved suggests important differences between them and CE in several parameters of female reproductive effort and breeding strategy, including maternal and copulatory behavior, optimal timing of litters, and hormonal control of heat and lactation.

show abstract

Growth and Development of Pseudomys gracilicaudatus (Rodentia: Muridae) in the Laboratory

Cited by 16 publications

References 0 publications

Differentiation and frequency distributions of body weights in plants and animals

Differentiation and frequency distributions of body weights in plants and animals

Landscape genetics of an early successional specialist in a disturbance‐prone environment

Postpartum and lactational estrus: A comparative analysis in rodentia.

Contact Info

Product

Resources

About