The content of neutral lipids in tissue homogenates and liver cell nuclei of hibernating Yakutian ground squirrels was studied. In homogenates, hibernation increases the content of fatty acids and reduces the content of glycerides and cholesterol. When studying the liver cell nuclei of torpid winter ground squirrels, we detected a twofold increase in the content of fatty acids, cholesterol, and monoglycerides as compared to the "summer" ground squirrels. In the active "winter" ground squirrels, as compared to the torpid winter ones, the content of cholesterol did not change, whereas the content of fatty acids, monoglycerides, and diglycerides decreased but remained higher than in the "summer" ground squirrels.
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http://dx.doi.org/10.1134/S160767291605015X | DOI Listing |
Ecol Lett
December 2024
Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France.
It has recently been recognised that populations are rarely in demographic equilibrium, but rather in a 'transient' state. To examine how transient dynamics influence our empirical understanding of the links between changes in demographic rates and population growth, we conducted a 32-year study of Columbian ground squirrels. The population increased rapidly for 10 years, followed by a 2-year crash, and a gradual 19-year recovery.
View Article and Find Full Text PDFComp Biochem Physiol A Mol Integr Physiol
December 2024
Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia; Department of Physiology and Pathology, Faculty of Basic Medicine, M.V. Lomonosov Moscow State University, Moscow, Russia.
Hibernation is accompanied by dramatic decrease of blood flow in many organs due to the increase of their vascular resistances. We compared the responses of mesenteric, renal, and cerebral proximal resistance arteries in summer active (SA) and winter hibernating (WH) ground squirrels and studied the signaling pathways of Rho-kinase and NO. Wire myography and Western blotting were used to assess the arterial responses and protein abundances.
View Article and Find Full Text PDFJ Med Entomol
December 2024
Department of Biology, San Francisco State University, San Francisco, CA, USA.
Pacific Coast tick fever is a recently described zoonotic disease in California caused by a spotted fever group rickettsia, Rickettsia rickettsii subsp. californica (formerly Rickettsia 364D) and transmitted by the Pacific Coast tick, Dermacentor occidentalis. Like many emerging vector-borne diseases, knowledge regarding the transmission cycle, contribution from potential amplifying hosts, and geographic distribution of R.
View Article and Find Full Text PDFInt J Mol Sci
November 2024
Department of Aerospace Physiology, Air Force Medical University, Xi'an 710032, China.
Hibernating mammals experience severe hemodynamic changes over the torpor-arousal cycle, with oxygen consumption reaching peaks during the early stage of torpor to re-enter arousal. Melatonin (MT) can improve mitochondrial function and reduce oxidative stress and inflammation. However, the regulatory mechanisms of MT action on the vascular protective function of hibernators are still unclear.
View Article and Find Full Text PDFCurr Zool
December 2024
The Rocky Mountain Biological Laboratory, Crested Butte, CO 81224, USA.
Dispersal is an important individual decision which may influence individual fitness as well as population viability. The social cohesion hypothesis posits more social individuals remain at home, which is supported by prior work across taxa. However, how the sociality and connectivity of the group an individual resides in-their group social structure-relates to dispersal decisions has not been explored.
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