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The responses of sea turtles to temp...

Moon, Dae-Yeon.

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The responses of sea turtles to temperature changes: Behavior, metabolism, and thyroid hormones.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The responses of sea turtles to temperature changes: Behavior, metabolism, and thyroid hormones./
作者:	Moon, Dae-Yeon.
面頁冊數:	195 p.
附註:	Chair: David W. Owens.
Contained By:	Dissertation Abstracts International53-06B.
標題:	Biology, Animal Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9232545

The responses of sea turtles to temperature changes: Behavior, metabolism, and thyroid hormones.
Moon, Dae-Yeon.

The responses of sea turtles to temperature changes: Behavior, metabolism, and thyroid hormones. - 195 p.

Chair: David W. Owens.

Thesis (Ph.D.)--Texas A&M University, 1992.

To simulate the adaptational characteristics of sea turtles to cold in the wild, a series of experiments were conducted using captive sea turtles which have been maintained in constantly warm water temperature. Captive immature green, Chelonia mydas, and Kemp's ridley, Lepidochelys kempi, sea turtles showed depressed metabolism and activity in cold temperatures. Both species demonstrated that they are able to adapt to cold temperatures behaviorally and physiologically. Moreover, the two species appear to have different "strategies" to avoid cold temperature. The green turtle appear to behaviorally tolerate the onset of cold water temperatures, whereas the ridleys become very agitated and active as they are exposed to cold temperatures. However, both species displayed semi-dormant behavior in cold water at the temperatures below 15$\sp\circSubjects--Topical Terms:

1017835
Biology, Animal Physiology.

The responses of sea turtles to temperature changes: Behavior, metabolism, and thyroid hormones.
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035 $a (UMI)AAI9232545
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100 1 $a Moon, Dae-Yeon. $3 1277274
245 1 4 $a The responses of sea turtles to temperature changes: Behavior, metabolism, and thyroid hormones.
300 $a 195 p.
500 $a Chair: David W. Owens.
500 $a Source: Dissertation Abstracts International, Volume: 53-06, Section: B, page: 2728.
502 $a Thesis (Ph.D.)--Texas A&M University, 1992.
520 $a To simulate the adaptational characteristics of sea turtles to cold in the wild, a series of experiments were conducted using captive sea turtles which have been maintained in constantly warm water temperature. Captive immature green, Chelonia mydas, and Kemp's ridley, Lepidochelys kempi, sea turtles showed depressed metabolism and activity in cold temperatures. Both species demonstrated that they are able to adapt to cold temperatures behaviorally and physiologically. Moreover, the two species appear to have different "strategies" to avoid cold temperature. The green turtle appear to behaviorally tolerate the onset of cold water temperatures, whereas the ridleys become very agitated and active as they are exposed to cold temperatures. However, both species displayed semi-dormant behavior in cold water at the temperatures below 15$\sp\circ $c . Importantly, they did continue to come up to the surface to breathe periodically at intervals up to 3 hours. Plasma thyroid hormone levels and blood metabolic parameters, such as blood glucose, total protein, pO$\sb2$ and pCO$\sb2$ decreased with temperature, indicating slower metabolism in cold water.
520 $a Under constant temperature, nutritional status affected plasma thyroid hormones and glucose level, but not protein level in green and Kemp's ridley turtles. Plasma T$\sb4$ in green turtles decreased with deprivation of food, but did not do so in Kemp's ridleys. Increased feeding did not affect circulating levels of plasma T$\sb4$ in either species. Plasma T$\sb3$, in contrast, tended to decrease during fasting and increase with refeeding or increased feeding. Blood glucose level fell with deprivation of food, but remained constant during increased feeding. Sea turtles may use glycogen or lipid during short-term fasting as in endothermic vertebrates.
520 $a In immature wild green and loggerhead, Caretta caretta, sea turtles, serum thyroid hormones appeared to be more or less associated with temperature. In contrast, captive adult Kemp's ridleys showed that serum thyroid hormones were associated with a reproductive status rather than temperature. It is suggested that the lower T$\sb4$ levels in wild turtles relative to captive ones may be caused primarily by nutritional state.
520 $a There are distinct differences in total blood protein and the distribution pattern of the proteins between the captive and wild turtles which were sampled. Wild turtles appear to have higher levels of total blood protein than captive turtles. In electrophoretic patterns of proteins, wild turtles have two major bands (160,000 and 66,000 MW), whereas captive turtles only have albumin-like protein as a major band at a molecular weight of about 66,000.
590 $a School code: 0803.
650 4 $a Biology, Animal Physiology. $3 1017835
650 4 $a Biology, Zoology. $3 1018632
690 $a 0433
690 $a 0472
710 2 $a Texas A&M University. $3 718977
773 0 $t Dissertation Abstracts International $g 53-06B.
790 $a 0803
790 1 0 $a Owens, David W., $e advisor
791 $a Ph.D.
792 $a 1992
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9232545