Seasonal Thyroid Cycle of the Soft-shelled Turtle,<i>Lissemys p. punctata</i>(Bonnoterre)

Sengupta, Amita; Sarkar, Sobhan; Chaudhuri-Sengupta, Santasri; Ray, Prajna Paramita; Maiti, B. R.

doi:10.1080/09291010412331335751

Cited by 7 publications

(4 citation statements)

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“…Animals of this species exhibit last stage of thyroid activity having brittle colloid bound with very thin epithelium often ragged. In female soft-shelled turtle, Lissemys p. punctata thyroid gland weight and epithelial height were higher during March through May, decreased from June through August and began to rise thereafter (September through February) (Sengupta et al, 2004). In the present investigation the thyroid weight and epithelial height are inversely related.…”

Section: Discussionsupporting

confidence: 41%

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

Chandavar

Naik

2010

JANS

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Abstract: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, which gradually 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.

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Section: Discussionsupporting

confidence: 41%

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

Chandavar

Naik

2010

JANS

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“…This differs from previous studies of this population as well as other reptiles, which describe T 4 and T 3 concentrations that fluctuate together, whereas in this study T 3 and T 4 concentrations had independent patterns. (Boggs et al, 2011; El-Deib, 2005; Sciarrillo et al, 2000; Sengupta et al, 2004; Virgilio et al, 2004). Thermal regulation could account for the lack of seasonality in T 3 concentrations among the larger adults as large adults had significantly higher T 3 concentrations when compared to small adults in February.…”

Section: Discussionmentioning

confidence: 99%

Urinary iodine and stable isotope analysis to examine habitat influences on thyroid hormones among coastal dwelling American alligators

Boggs

Hamlin

Nifong

et al. 2016

General and Comparative Endocrinology

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The American alligator, generally a freshwater species, is known to forage in marine environments despite the lack of a salt secreting gland found in other crocodylids. Estuarine and marine foraging could lead to increased dietary uptake of iodine, a nutrient necessary for the production of thyroid hormones. To explore the influence of dietary iodine on thyroid hormone health of coastal dwelling alligators, we described the seasonal plasma thyroxine and triiodothyronine concentrations measured by radioimmunoassay and urinary iodine (UI) concentrations measured by inductively coupled plasma mass spectrometry. We also analyzed long-term dietary patterns through stable isotope analysis of scute tissue. Snout-to-vent length (SVL) was a significant factor among UI and stable isotope analyses. Large adult males greater than 135 cm SVL had the highest UI concentrations but did not display seasonality of thyroid hormones. Alligators under 135 SVL exhibited seasonality in thyroid hormones and a positive relationship between UI and triiodothyronine concentrations. Isotopic signatures provided supporting evidence that large males predominantly feed on marine/estuarine prey whereas females showed reliance on freshwater/terrestrial prey supplemented by marine/estuarine prey. UI measurement provided immediate information that correlated to thyroid hormone concentrations whereas stable isotope analysis described long-term dietary patterns. Both techniques demonstrate that adult alligators in coastal environments are utilizing estuarine/marine habitats, which could alter thyroid hormone physiology.

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“…Mid upper arm circumference (cm) was measured midway between the tip of the shoulder and the elbow of the left arm with the arm hanging freely by the side using a flexible tape [22].…”

Section: Measurement Of Mid Upper Arm Circumferencementioning

confidence: 99%

Assessment of Physiological Health Status in Relations to Different Anthropometric and Cardio-Respiratory Measures of Head-Supported Load Carrying Male Porters of Sikkim, India

Bhattacharya¹,

Budiati²

2017

IJPCR

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Background: Carrying heavy loads in the hilly region, porters face extreme ranges in terrain condition, sloped path that is very steep and lack of oxygen due to altitude. The porters in Sikkim, India, routinely carry head-supported loads, which often exceed their body weight, over long distances up and down the steep mountain footpaths which prompted us to assess occupational health status of these head supported load carrying porters. Objective: We aimed our study to evaluate physical and physiological status of male porters of Gangtok, Sikkim. Methods: Seventeen male porters and twenty one healthy as well as age matched (Age: 37 – 52 years) control subjects were selected for the study. Different physical, anthropometric and physiological parameters were studied. Students “t” test was performed to find out the significant difference (P less than 0.05), if any, between the selected variables. Results: Results of this study on male porters suggest that they are physically healthy but having spinal shrinkage along with lower hand grip strength and PEFR. Conclusion: This study supports the hypothesis that the male porters are associated with decreased lung function and increased spinal shrinkage. To develop an effective intervention strategy, the treatment seeking behavior of individuals would also need to be improved through awareness program

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Seasonal Thyroid Cycle of the Soft-shelled Turtle,Lissemys p. punctata(Bonnoterre)

Cited by 7 publications

References 0 publications

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

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

Urinary iodine and stable isotope analysis to examine habitat influences on thyroid hormones among coastal dwelling American alligators

Assessment of Physiological Health Status in Relations to Different Anthropometric and Cardio-Respiratory Measures of Head-Supported Load Carrying Male Porters of Sikkim, India

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