Seasonal Variation in the Metabolism and Thyroid Activity of the Black-Capped Chickadee (Parus atricapillus)

The Condor ◽  
1974 ◽  
Vol 76 (2) ◽  
pp. 198 ◽  
Author(s):  
James D. Rising ◽  
Jack W. Hudson
Keyword(s):  
Seasonal Variation ◽  
Thyroid Activity ◽  
Parus Atricapillus

scholarly journals Seasonal variation in sleeping metabolic rate, thyroid activity, and leptin

2003 ◽  
Vol 285 (2) ◽  
pp. E338-E343 ◽  
Author(s):  
Guy Plasqui ◽  
Arnold D. M. Kester ◽  
Klaas R. Westerterp
Keyword(s):  
Body Composition ◽  
Seasonal Variation ◽  
Metabolic Rate ◽  
Compartment Model ◽  
Fat Free Mass ◽  
Interindividual Variation ◽  
Dilution Method ◽  
Thyroid Activity ◽  
Intraindividual Variation ◽  
Total Thyroxine

We investigated seasonal variation in sleeping metabolic rate (SMR) and the possible relation to body composition, thyroid activity, and leptin. Twenty-five healthy volunteers were examined four times during the year: in spring (April, May), summer (July, August), autumn (October, November), and winter (January, February). Body composition was determined using a three-compartment model based on underwater weighing and the deuterium dilution method. SMR was measured during an overnight stay in a respiration chamber. A blood sample was taken for the analysis of free and total thyroxine, TSH, and leptin. SMR showed a significant seasonal variation ( P < 0.01) with a maximum in winter (4.54 kJ/min) and a minimum in summer (4.34 kJ/min). The amplitude was 0.10 ± 0.02 kJ/min, and the phase was November 5th. Season explained 17% of the intraindividual variation in SMR. The circannual rhythm in SMR could not be explained by changes in body composition, thyroid activity, or leptin. Interindividual variation in SMR was explained by fat-free mass ( P < 0.001) and leptin ( P < 0.001).

scholarly journals Seasonal variation in thyroid activity of turtle Lissemys punctata with respect to annual cycle of reproduction

2010 ◽  
Vol 2 (2) ◽  
pp. 194-199
Author(s):  
Vidya R. Chandavar ◽  
Prakash R. Naik
Keyword(s):  
Seasonal Variation ◽  
Reproductive Cycle ◽  
Annual Cycle ◽  
Seasonal Cycle ◽  
Maximum Size ◽  
Reproductive Period ◽  
Thyroid Activity ◽  
The Relationship

The objective of the present investigation was to study the relationship between thyroid activity and reproductive cycle in turtle Lissemys punctata. The animals were studied in the annual seasonal cycle of reproduction for two consecutive years, which is distinguished into three separate periods namely regenerative, reproductive and recrudescent. The thyroid in L. punctata was observed to be a single pyramid shaped gland, creamy white to reddish-brown in color with lenticular profile. The diameter of the follicle was lowest in regenerative period, whichgradually increased in reproductive period attaining maximum size in recrudescent, where as epithelial height was highest in regenerative period, which gradually decreased in reproductive period reaching minimum in recrudescent period. Thyroid activity varies annually in relation to different phases of reproductive periods.

scholarly journals Comparative Studies of the Thyroid Function in Teleosts of Tropical and Temperate Habitats

1955 ◽  
Vol 32 (3) ◽  
pp. 504-513
Author(s):  
P. Y. FORTUNE
Keyword(s):  
Seasonal Variation ◽  
Thyroid Function ◽  
Comparative Studies ◽  
Thyroid Activity ◽  
Thermal Range ◽  
Environmental Temperatures ◽  
Thiourea Treatment

1. Normal and thiourea-treated Phoxinus and Lebistes show a depression of thyroid activity by low environmental temperatures and stimulation by high. 2. Thiourea treatment affects the thermal range in both species. 3. Phoxinus shows a seasonal variation in thyroid activity, correlated with breeding periods. This is absent in Lebistes. 4. No effect of the thyroid on growth could be demonstrated.

Seasonal Variation in Eating Satisfaction in Norway

2000 ◽  
Author(s):  
Judith Perry ◽  
David Silvera ◽  
Jan Rosenvinge
Keyword(s):  
Seasonal Variation

Seasonal variation of plasma free normetanephrine concentrations: implications for biochemical diagnosis of pheochromocytoma

2014 ◽  
Vol 122 (03) ◽  
Author(s):  
C Pamporaki ◽  
M Bursztyn ◽  
M Reimann ◽  
T Ziemssen ◽  
SR Bornstein ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Biochemical Diagnosis
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