Plasma sequestration produced by acute changes in body temperature in turtles

Jt, Stitt; Semple, RE; Sigsworth, DW

doi:10.1152/ajplegacy.1971.221.4.1185

Cited by 12 publications

(2 citation statements)

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“…In ChrysemYs .Boridana the half time of '33xe clearance from the carapace and subcutaneous area of the hindleg during cooling was significantly greater than during heating, indicating that blood flow to these areas was greater during heating than during cooling (Weathers and White 1971). Stitt, Semple, and Sigsworth (1971) found a plasma sequestration (blood flow cut off from a region of the body) in Graptem!/s geographica during cooling from 20 to 5°C.…”

Section: Discussionmentioning

confidence: 87%

Behavioral Ecology of Basking in the Yellow-bellied Turtle, Chrysemys scripta scripta (Shoepff)

Auth

1975

FLMNH

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The purpose of this study is to determine if basking in turtles is thermoregulatory and to describe the attendant behavior. Observations were made from a blind on a marked population of Chrysemys scripta scripta (Schoepff) and an unmarked population of Chrysenigs floridana peninsularis Carr at a north Florida sinkhole pond. The study was conducted between August and December, 1968, thus providing a wide range of environmental temperatures and sunshine in which to obserte any variations in basking behavior. The number of atmospherically-basking C. s. scripta and C. f peninsularis per day, as well as the number of times individual C s. scripta basked per day, reached a peak at a daily mean water temperature of 28.5°C. Basking decreased during overcast periods. Aquatic basking in C. s. scripta and C. f peninsularis increased as water temperature approached 31.5°C, the maximum mean water temperature recorded during the experimental period. Temperature-telemetry revealed that an adult basking scripta could elevate its body temperature at least 10°C above near-surface water temperatures. Because of decreased sunshine and air and water temperatures from August to December, and the resultant slower rate of body temperature rise, mean basking duration in C. s. scripta increased during those months. Basking duration is also directly related to body size. Basking does not appear to be a daily requirement, even under optimum weather conditions. Some C. s. scripta basked up to five times a day in favorable weather; however, a considerable percentage of the population did not bask every day. Basking activity started about 0800 and reached a daily maximum between 1000 and 1100 each clear day in August and September. The time at which activity started and the time it reached a daily maximum shifted to a later part of the day during October and November. Thermoregulation appears to be the primary function of the basking act in C. s. scripta and C. f peninsularis. This conclusion is based on the following basking behavioral patterns: 1) body orientatign, head and leg extension and retraction, leg kicking, and rear-foot digit spreading; 2) remaining on a site for considerable periods of time after it becomes shaded and the turtle's body temperature has increased, but rarely emerging at an already shaded site; 3) varying frequency and inversely varying duration with decreasing air and water temperatures and sunshine (shown for C. s. scripta only); and 4) sitting on submerged basking sites or floating in warm surface water.

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Section: Discussionmentioning

confidence: 87%

Behavioral Ecology of Basking in the Yellow-bellied Turtle, Chrysemys scripta scripta (Shoepff)

Auth

1975

FLMNH

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“…In turtles exposed to cold, Stitt & Semple (1971) and Stitt et al (1971) found a sequestration of plasma in blood vessels closed to the general circulation. This plasma returned to the circulation upon re-warming the animal.…”

Section: Discussionmentioning

confidence: 97%

Haematological adjustments with diurnal changes in body temperature in a lizard and a mouse

Maclean

Lee

Withers

1975

Comparative Biochemistry and Physiology Part A: Physiology

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Hypothermic lizards (Egernia ctmninghami) showed significant reductions in plasma volume, haematocrit and haemoglobin concentration. The changes in the distribution of red cells were acutely reversible when body temperature was increased. 2. Consequently, there were no significant alterations in blood viscosity (when measured in z&o in a capillary viscometer) between body temperatures of 32°C (preferred body temperature) and 20°C. 3. In contrast, mice (Peromyscus leucopus) showed no significant changes in haematocrit, haemoglobin concentration or red cell count, associated with diurnal torpor. 4. These results are discussed in relation to haemofluidity and optimization of oxygen transport.

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Blood viscosity and hematological changes during prolonged submergence in normoxic water of northern and southern musk turtles (Sternotherus odoratus)

2000

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Musk turtles (Sternotherus odoratus) can survive at least 150 days of submergence in normoxic water at 3°C, during which time there are large increases in packed cell volume (PCV). We investigated the effects of submergence in normoxic water at 3°C on the blood viscosity of musk turtles from northern (Massachusetts) and southern (Alabama) locales. Blood was collected from air‐breathing turtles and after 20, 50, 100, and 150 days of submergence in normoxic water at 3°C. Hematological responses to submergence were similar in the two groups, therefore the results were combined. Packed cell volume increased steadily above that of controls after 20, 50, 100, and 150 days of submergence. Hemoglobin concentration also progressively increased above that of controls after 20, 50, and 100 days of submergence but declined to near control values after 150 days. Blood viscosity increased with increasing PCV; however, blood viscosity of musk turtles appears less affected by PCV than is blood viscosity of mammalian species. As such, musk turtles appear to be able to maintain adequate blood flow to tissues while increasing the oxygen carrying capacity of the blood during prolonged submergence. However, after 150 days submergence, oxygen delivery should decrease due to a reduced oxygen carrying capacity of the blood and an increased resistance to blood flow, which may limit the length of time these turtles can remain viable during hibernation. J. Exp. Zool. 287:459–466, 2000. © 2000 Wiley‐Liss, Inc.

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Plasma sequestration produced by acute changes in body temperature in turtles

Cited by 12 publications

References 0 publications

Behavioral Ecology of Basking in the Yellow-bellied Turtle, Chrysemys scripta scripta (Shoepff)

Behavioral Ecology of Basking in the Yellow-bellied Turtle, Chrysemys scripta scripta (Shoepff)

Haematological adjustments with diurnal changes in body temperature in a lizard and a mouse

Blood viscosity and hematological changes during prolonged submergence in normoxic water of northern and southern musk turtles (Sternotherus odoratus)

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