Water conservation in fasting northern elephant seals (Mirounga angustirostris)
نویسندگان
چکیده
منابع مشابه
Water conservation in fasting northern elephant seals (Mirounga angustirostris).
Prolonged terrestrial fasting is a key element in the life history of elephant seals. While on land seals typically fast without access to fresh water, and thus must maintain positive water balance by reductions in water loss such that they can subsist primarily on metabolic water production (MWP). The terrestrial apnea demonstrated by seals may reduce respiratory evaporative water loss (REWL) ...
متن کاملAngiotensin II and aldosterone increase with fasting in breeding adult male northern elephant seals (Mirounga angustirostris).
The renin-angiotensin-aldosterone system (RAAS) appears to contribute significantly to osmoregulation of fasting northern elephant seal (Mirounga angustirostris) pups; however, RAAS has not been characterized in fasting adult seals. Therefore, this study examined the contribution of RAAS to water turnover rates in fasting adult male northern elephant seals. Blood samples were obtained twice dur...
متن کاملHormonal changes associated with the transition between nursing and natural fasting in northern elephant seals (Mirounga angustirostris).
To better interpret previously described hormonal changes observed during the natural postweaning fast (2-3 months) endured by pups of the northern elephant seal (Mirounga angustirostris), we compared plasma cortisol, thyroid hormones, and leptin in pups (n=5) measured during nursing and fasting periods. Blood samples were taken at four times; early (9 days postpartum) and late (18-22 days post...
متن کاملDevelopmental aspects of sleep apnoea in northern elephant seals, Mirounga angustirostris
Northern elephant seals, Miroungu angus/irostri.s, breathe irregularly while sleeping on land, alternating bouts of breath-holding (apnoea) that can last up to 25 min with periods of breathing (eupnoea). Our aims were to quantify changes in this behaviour during development and to determine the correspondence between these ontogenetic changes and those indcpendently recorded in the dive duratio...
متن کاملFasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris)
Fasting typically suppresses thyroid hormone (TH)-mediated cellular events and increases sirtuin 1 (SIRT1) activity. THs may regulate metabolism through nongenomic pathways and directly through activation of adenosine monophosphate-activated protein kinase (AMPK). Adult male elephant seals (Mirounga angustirostris) are active, hypermetabolic, and normothermic during their annual breeding fast, ...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2006
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.02503