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Nail growth arrest under low body temperature during hibernation.
J Physiol Sci
January 2025
Hibernation Metabolism, Physiology and Development Group, Institute of Low Temperature Science, Hokkaido University, Sapporo, Hokkaido, Japan; Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan; Inamori Research Institute for Science Fellowship (InaRIS), Kyoto, Japan. Electronic address:
Growth and differentiation are reduced or stopped during hibernation, an energy conserving strategy in harsh seasons by lowered metabolism and body temperature. However, few studies evaluated this in a same individual using a non-invasive method. In this study, we applied a non-invasive tracking method of the nail growth throughout the hibernation period in the same hibernating animals, the Syrian hamster (Mesocricetus auratus).
View Article and Find Full Text PDFNovel environmental variables help explain winter weather effects on activity and habitat selection of greater sage-grouse along the border of Colorado and Wyoming, USA.
Int J Biometeorol
December 2024
Department of Ecosystem Science and Management, University of Wyoming, Laramie, WY, 82071, USA.
For non-hibernating species within temperate climates, survival during severe winter weather often depends on individuals' behavioral response and available refugia. Identifying refugia habitat that sustains populations during adverse winter conditions can be difficult and complex. This study provides an example of how modeled, biologically relevant snow and weather information can help identify important relationships between habitat selection and dynamic winter landscapes using greater sage-grouse (Centrocercus urophasianus, hereafter "sage-grouse") as a model species.
View Article and Find Full Text PDFLandscape-scale drivers of spatial dynamics and genetic diversity in an emerging wildlife pathogen.
Oecologia
December 2024
Department of Biological Sciences, University of Pittsburgh, 105 Clapp Hall, 5th and Ruskin Aves., Pittsburgh, PA, 15260, USA.
Aquatic pathogens often cannot tolerate drying, and thus their spread, and diversity across a landscape may depend on interactions between hydrological conditions and the movement of infected hosts. The aquatic fungus Batrachochytrium dendrobatidis (Bd) is a nearly ubiquitous pathogen of amphibians and particular lineages have been associated with host declines. By coupling amphibian surveys with molecular pathogen detection and genotyping techniques, we characterized the spatial dynamics and genetic diversity of Bd on a landscape containing both permanent and ephemeral ponds.
View Article and Find Full Text PDFInhibition of the hypothalamic ventromedial periventricular area activates a dynorphin pathway-dependent thermoregulatory inversion in rats.
Curr Biol
January 2025
Department of Neurological Surgery, Oregon Health & Science University, Portland, OR 97239, USA; Department of Biomedical and Neuromotor Science, University of Bologna, Bologna 40126, Italy. Electronic address:
To maintain core body temperature in mammals, CNS thermoregulatory networks respond to cold exposure by increasing brown adipose tissue and shivering thermogenesis. However, in hibernation or torpor, this canonical thermoregulatory response is replaced by a new, emerging paradigm, thermoregulatory inversion (TI), an alternative homeostatic state in which cold exposure inhibits thermogenesis and warm exposure stimulates thermogenesis. Here, we demonstrate that in the non-torpid rat, either exclusion of the canonical thermoregulatory integrator in the preoptic hypothalamus or inhibition of neurons in the ventromedial periventricular area (VMPeA) induces the TI state through an alternative thermoregulatory pathway.
View Article and Find Full Text PDFSuppression of neurons in circumventricular organs enables months-long survival without water in thirteen-lined ground squirrels.
Science
November 2024
Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT, USA.
Water deprivation is a life-threatening condition that engages a protective physiological response to couple osmolyte retention with potentiation of thirst. This response, typical for most mammals, safeguards against short-term water deprivation but fails in the long term. Thirteen-lined ground squirrels () use the short-term response during summer, whereas during winter, they lack thirst and survive without water for months.
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