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Fisher Brian - One of the best experts on this subject based on the ideXlab platform.

Neville Pillay - One of the best experts on this subject based on the ideXlab platform.

  • demography of the striped mouse rhabdomys pumilio in the Succulent karoo
    Mammalian Biology, 2005
    Co-Authors: Carsten Schradin, Neville Pillay
    Abstract:

    The striped mouse (Rhabdomys pumilio) is widely distributed in southern Africa, inhabiting a wide range of habitats. We describe the demography of the striped mouse in the arid Succulent karoo of South Africa, and compare our findings with those of published results for the same species from the moist grasslands of South Africa. In both habitats, breeding starts in spring, but the breeding season in the Succulent karoo is only half as long as in the grasslands, which can be explained by different patterns and levels of rainfall; the Succulent karoo receives mainly winter rain and rainfall is much less (about 160 mm year−1) than in the grasslands (>1000 mm year−1) which experience summer rain. Population density increased from 37 (start of breeding season) to 171 (end of breeding season) mice per hectare. A high yearly survival rate of 27% during our study from summer to the next breeding season resulted in a population density that was 10 times higher in the Succulent karoo than in grasslands. The comparatively high population density may result in habitat saturation and thus forced philopatry, promoting group living in the Succulent karoo, which contrasts with the solitary life-style exhibited by populations in moist grasslands.

  • intraspecific variation in the spatial and social organization of the african striped mouse
    Journal of Mammalogy, 2005
    Co-Authors: Carsten Schradin, Neville Pillay
    Abstract:

    Social flexibility, that is, the expression of different types of social systems within one species, has been reported in several mammalian taxa, including rodents. However, sociality in rodents has been studied mostly in captivity and the results are often regarded as laboratory artifacts. We present field data for 2 populations of the striped mouse (Rhabdomys pumilio), a diurnal muroid rodent from southern Africa. The 2 populations inhabit different environments and demonstrate differences in social organization. R. pumilio in the arid Succulent karoo lives in social groups, comprising multiple adults of both sexes that share 1 nest and the same territory. Striped mice in the moist grasslands of South Africa are solitary. Females inhabit exclusive territories and territories of males overlap those of several females; association between the sexes appears to be restricted to mating. Home ranges of females in the grasslands were 6 times larger and home ranges of males were 10 times larger than their counterparts in the Succulent karoo. Onset of reproductive activity occurred earlier and at a significantly lighter body weight in grasslands. In the Succulent karoo, sexually mature offspring remain in their natal group without reproducing. We suggest that group living in the Succulent karoo is in response to habitat saturation and the benefits of philopatry, whereas living alone in the grasslands may be a response to limiting resources, such as food.

  • the striped mouse rhabdomys pumilio from the Succulent karoo south africa a territorial group living solitary forager with communal breeding and helpers at the nest
    Journal of Comparative Psychology, 2004
    Co-Authors: Carsten Schradin, Neville Pillay
    Abstract:

    The authors studied the striped mouse (Rhabdomys pumilio) in the semiarid Succulent karoo of South Africa. Mice forage alone, but they live in groups that share a common nest. Groups consist of 1 to 4 breeding females, 1 to 2 breeding males, and their offspring of both sexes, which remain in their natal group even after reaching adulthood, participating in territorial defense and nest building without showing signs of reproductive activity. Interactions are typically amicable and take place inside or in front of the nest. In contrast, encounters with mice from other groups are aggressive. Group living in the Succulent karoo is possibly due to ecological constraints imposed by habitat saturation because of a year-round stable food supply as well as associated benefits of philopatry.

Esteves Flavia - One of the best experts on this subject based on the ideXlab platform.

Carsten Schradin - One of the best experts on this subject based on the ideXlab platform.

  • demography of the striped mouse rhabdomys pumilio in the Succulent karoo
    Mammalian Biology, 2005
    Co-Authors: Carsten Schradin, Neville Pillay
    Abstract:

    The striped mouse (Rhabdomys pumilio) is widely distributed in southern Africa, inhabiting a wide range of habitats. We describe the demography of the striped mouse in the arid Succulent karoo of South Africa, and compare our findings with those of published results for the same species from the moist grasslands of South Africa. In both habitats, breeding starts in spring, but the breeding season in the Succulent karoo is only half as long as in the grasslands, which can be explained by different patterns and levels of rainfall; the Succulent karoo receives mainly winter rain and rainfall is much less (about 160 mm year−1) than in the grasslands (>1000 mm year−1) which experience summer rain. Population density increased from 37 (start of breeding season) to 171 (end of breeding season) mice per hectare. A high yearly survival rate of 27% during our study from summer to the next breeding season resulted in a population density that was 10 times higher in the Succulent karoo than in grasslands. The comparatively high population density may result in habitat saturation and thus forced philopatry, promoting group living in the Succulent karoo, which contrasts with the solitary life-style exhibited by populations in moist grasslands.

  • intraspecific variation in the spatial and social organization of the african striped mouse
    Journal of Mammalogy, 2005
    Co-Authors: Carsten Schradin, Neville Pillay
    Abstract:

    Social flexibility, that is, the expression of different types of social systems within one species, has been reported in several mammalian taxa, including rodents. However, sociality in rodents has been studied mostly in captivity and the results are often regarded as laboratory artifacts. We present field data for 2 populations of the striped mouse (Rhabdomys pumilio), a diurnal muroid rodent from southern Africa. The 2 populations inhabit different environments and demonstrate differences in social organization. R. pumilio in the arid Succulent karoo lives in social groups, comprising multiple adults of both sexes that share 1 nest and the same territory. Striped mice in the moist grasslands of South Africa are solitary. Females inhabit exclusive territories and territories of males overlap those of several females; association between the sexes appears to be restricted to mating. Home ranges of females in the grasslands were 6 times larger and home ranges of males were 10 times larger than their counterparts in the Succulent karoo. Onset of reproductive activity occurred earlier and at a significantly lighter body weight in grasslands. In the Succulent karoo, sexually mature offspring remain in their natal group without reproducing. We suggest that group living in the Succulent karoo is in response to habitat saturation and the benefits of philopatry, whereas living alone in the grasslands may be a response to limiting resources, such as food.

  • the striped mouse rhabdomys pumilio from the Succulent karoo south africa a territorial group living solitary forager with communal breeding and helpers at the nest
    Journal of Comparative Psychology, 2004
    Co-Authors: Carsten Schradin, Neville Pillay
    Abstract:

    The authors studied the striped mouse (Rhabdomys pumilio) in the semiarid Succulent karoo of South Africa. Mice forage alone, but they live in groups that share a common nest. Groups consist of 1 to 4 breeding females, 1 to 2 breeding males, and their offspring of both sexes, which remain in their natal group even after reaching adulthood, participating in territorial defense and nest building without showing signs of reproductive activity. Interactions are typically amicable and take place inside or in front of the nest. In contrast, encounters with mice from other groups are aggressive. Group living in the Succulent karoo is possibly due to ecological constraints imposed by habitat saturation because of a year-round stable food supply as well as associated benefits of philopatry.

Alex L Sessions - One of the best experts on this subject based on the ideXlab platform.

  • crassulacean acid metabolism influences d h ratio of leaf wax in Succulent plants
    Organic Geochemistry, 2010
    Co-Authors: Sarah J Feakins, Alex L Sessions
    Abstract:

    This study sought to characterize hydrogen isotopic fractionation during biosynthesis of leaf wax nalkanes in Succulent plants capable of crassulacean acid metabolism (CAM). The metabolic and physiological features of CAM represent crucial strategies for survival in hot and dry climates and have been hypothesized to impact hydrogen isotope fractionation. We measured the stable carbon and hydrogen isotopic compositions (d 13 C and dD, respectively) of individual n-alkanes in 20 species of Succulent plants from a global collection of the Huntington Botanical Gardens, San Marino, California. Greenhouse conditions and irrigation with water of constant dD value enabled determination of interspecies differences in net D/H fractionation between source water and leaf wax products. Carbon isotope ratios provide constraints on the extent of CAM vs. C3 photosynthesis and indicate a wide range of CAM use, with d 13 C val

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