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Text
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URL Address
<a href="http://doi.org/10.1002/ajp.22714" target="_blank" rel="noreferrer noopener">http://doi.org/10.1002/ajp.22714</a>
Issue
11
Volume
79
Dublin Core
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Title
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Thyroid hormone fluctuations indicate a thermoregulatory function in both a tropical (Alouatta palliata) and seasonally cold-habitat (Macaca fuscata) primate.
Publisher
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American journal of primatology
Date
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2017
2017-11
Subject
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*energetics; *temperature; *thermal environment; *thermoregulation; *thyroid hormone; Alouatta/*physiology/urine; Animals; Basal Metabolism; Body Temperature Regulation/*physiology; Macaca/*physiology/urine; Seasons; Species Specificity; Temperature; Thyroid Hormones/*metabolism/urine
Creator
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Thompson Cynthia L; Powell Brianna L; Williams Susan H; Hanya Goro; Glander Kenneth E; Vinyard Christopher J
Description
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Thyroid hormones boost animals' basal metabolic rate and represent an important thermoregulatory pathway for mammals that face cold temperatures. Whereas the cold thermal pressures experienced by primates in seasonal habitats at high latitudes and elevations are often apparent, tropical habitats also display distinct wet and dry seasons with modest changes in thermal environment. We assessed seasonal and temperature-related changes in thyroid hormone levels for two primate species in disparate thermal environments, tropical mantled howlers (Alouatta palliata), and seasonally cold-habitat Japanese macaques (Macaca fuscata). We collected urine and feces from animals and used ELISA to quantify levels of the thyroid hormone triiodothyronine (fT3 ). For both species, fT3 levels were significantly higher during the cooler season (wet/winter), consistent with a thermoregulatory role. Likewise, both species displayed greater temperature deficits (i.e., the degree to which animals warm their body temperature relative to ambient) during the cooler season, indicating greater thermoregulatory pressures during this time. Independently of season, Japanese macaques displayed increasing fT3 levels with decreasing recently experienced maximum temperatures, but no relationship between fT3 and recently experienced minimum temperatures. Howlers increased fT3 levels as recently experienced minimum temperatures decreased, although demonstrated the opposite relationship with maximum temperatures. This may reflect natural thermal variation in howlers' habitat: wet seasons had cooler minimum and mean temperatures than the dry season, but similar maximum temperatures. Overall, our findings support the hypothesis that both tropical howlers and seasonally cold-habitat Japanese macaques utilize thyroid hormones as a mechanism to boost metabolism in response to thermoregulatory pressures. This implies that cool thermal pressures faced by tropical primates are sufficient to invoke an energetically costly and relatively longer-term thermoregulatory pathway. The well-established relationship between thyroid hormones and energetics suggests that the seasonal hormonal changes we observed could influence many commonly studied behaviors including food choice, range use, and activity patterns.
Identifier
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<a href="http://doi.org/10.1002/ajp.22714" target="_blank" rel="noreferrer noopener">10.1002/ajp.22714</a>
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
*energetics
*temperature
*thermal environment
*thermoregulation
*thyroid hormone
2017
Alouatta/*physiology/urine
American journal of primatology
Animals
Basal Metabolism
Body Temperature Regulation/*physiology
Glander Kenneth E
Hanya Goro
Macaca/*physiology/urine
Powell Brianna L
Seasons
Species Specificity
Temperature
Thompson Cynthia L
Thyroid Hormones/*metabolism/urine
Vinyard Christopher J
Williams Susan H