Pulmonary function of the green sea turtle, Chelonia mydas

1987 ◽  
Vol 62 (2) ◽  
pp. 459-463 ◽  
Author(s):  
R. N. Gatz ◽  
M. L. Glass ◽  
S. C. Wood
Keyword(s):  
Blood Flow ◽  
Pulmonary Blood Flow ◽  
Venous Blood ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Green Sea Turtle ◽  
Physiological Dead Space ◽  
Dead Space Volume ◽  
Residual Capacity ◽  
End Tidal

Lung volumes, oxygen uptake (VO2), end-tidal PO2, and PCO2, diffusing capacity of the lungs for CO (DLCO), pulmonary blood flow (QL) and respiratory frequency were measured in the green sea turtle (Chelonia mydas) (49–127 kg body wt). Mean lung volume (VL) determined from helium dilution was 57 ml/kg and physiological dead space volume (VD) was about 3.6 ml/kg. QL, determined from acetylene uptake during rebreathing, increased in proportion to VO2 with temperature. Therefore, constant O2 content difference was maintained between pulmonary arterial and venous blood. DLCO, measured using a rebreathing technique, was 0.04 ml X kg-1 X min-1 X Torr-1 at 25 degrees C. Several cardiopulmonary characteristics in C. mydas are advantageous to diving: large tidal volume relative to functional residual capacity promotes fast exchange of the alveolar gas when the turtle surfaces for breathing: and the concomitant rise of pulmonary blood flow and O2 uptake with temperature assures efficient O2 transport regardless of wide temperature variations encountered during migrations.

scholarly journals Gas Exchange in the Loggerhead Sea Turtle Caretta Caretta

1987 ◽  
Vol 131 (1) ◽  
pp. 365-372 ◽  
Author(s):  
M. E. LUTCAVAGE ◽  
P. L. LUTZ ◽  
H. BAIER
Keyword(s):  
Blood Flow ◽  
Pulmonary Blood Flow ◽  
Sea Turtles ◽  
Venous Blood ◽  
Loggerhead Turtle ◽  
Caretta Caretta ◽  
Sea Turtle ◽  
Aerobic Performance ◽  
Breathing Patterns ◽  
Loggerhead Sea Turtle

Pulmonary CO diffusion capacity (DLCO), lung volume (VL), oxygen uptake (Vo2) and pulmonary blood flow (QL) were measured simultaneously in the loggerhead sea turtle Caretta caretta (Linnaeus) (8–11 kg) using a gas rebreathing technique (syringe pump ventilation). Calculated DLCO and Vo2 values in the loggerhead turtle are approximately twice those of non-varanid reptiles and about 25 % of values for resting mammals. Evidence based on an estimated lung-capillary O2 gradient, δPo2, shows that only a small driving gradient is required for O2 conductance across the loggerhead turtle lung. Pulmonary blood flow values are high compared to those for other reptiles; on the basis of the Fick principle, this implies a substantial blood convection requirement. Differences in oxygen transport mechanisms between the loggerhead sea turtle and other highly aerobic but terrestrial reptiles may result from divergent lung structures and breathing patterns. In sea turtles, the coupling of respiration with locomotory behaviour is one factor that may limit aerobic performance. Since sea turtles have only intermittent access to air, they are required to load both arterial and venous blood with O2 before submerging

Pulmonary Blood Flow at Rest and during Swimming in the Green Turtle, Chelonia mydas

1992 ◽  
Vol 65 (2) ◽  
pp. 287-310 ◽  
Author(s):  
Nigel H. West ◽  
Patrick J. Butler ◽  
Richard M. Bevan
Keyword(s):  
Blood Flow ◽  
Green Turtle ◽  
Pulmonary Blood Flow ◽  
Chelonia Mydas

Immunological studies with the gonadotropins and their subunits from the green sea turtle Chelonia mydas

1977 ◽  
Vol 33 (2) ◽  
pp. 231-241 ◽  
Author(s):  
Paul Licht ◽  
Duncan S. MacKenzie ◽  
Harold Papkoff ◽  
Susan Farmer
Keyword(s):  
Chelonia Mydas ◽  
Sea Turtle ◽  
Green Sea Turtle

Identification of Papilloma-Like Virus Particles in Cell Lines Derived from Green Sea Turtle (Chelonia Mydas) With Fibropapilloma

1998 ◽  
Vol 4 (S2) ◽  
pp. 1158-1159
Author(s):  
Yuanan Lu ◽  
Vivek R. Nerurkar ◽  
Tina M. Weatherby ◽  
Richard Yanagihara
Keyword(s):  
Cell Lines ◽  
Soft Tissues ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Green Sea Turtle ◽  
Virus Particles ◽  
Green Sea Turtles ◽  
Multiple Organs ◽  
Isolation And Characterization

The near epidemic occurrence of fibropapilloma in green sea turtle (Chelonia my das) (Figure 1) significantly threatens the survival of this species which is protected under the U.S. Endangered Species Act. Although collective evidence suggests a viral etiology, the causative virus of green sea turtle fibropapilloma has not been isolated. To facilitate the isolation and characterization of the causative virus(es), we established 13 cell lines from multiple organs/tissues (tumor, kidney, lung, heart, gall bladder, testis, and skin) of green sea turtles with fibropapilloma. Serial subcultivation of cell lines derived from lungs, testis, eye soft tissues and tumors resulted in the formation of tumor-like aggregates, which attained sizes of 1-2 mm in diameter within two weeks (Figure 2). Media from such cultures, when inoculated onto cells derived from healthy turtle embryos, produced similar tumor-like aggregates, suggesting the presence of a transmissible agent.

The Green sea turtle (Chelonia mydas): mating, nesting and hatching on a farm

2009 ◽  
Vol 177 (3) ◽  
pp. 411-423 ◽  
Author(s):  
Marlin H. Simon ◽  
Glenn F. Ulrich ◽  
Alan S. Parkes
Keyword(s):  
Chelonia Mydas ◽  
Sea Turtle ◽  
Green Sea Turtle

Influence of pulmonary blood flow on management and outcome

2011 ◽  
Keyword(s):  
Blood Flow ◽  
Heart Disease ◽  
Pulmonary Circulation ◽  
Early Life ◽  
Pulmonary Blood Flow ◽  
Venous Blood ◽  
Cyanotic Heart Disease ◽  
Capillary Membrane ◽  
Pulmonary Vascular Development ◽  
Alveolar Capillary

Introduction 50Pulmonary vascular development in early life 50Cyanotic heart disease and pulmonary blood flow 52Delivery of systemic venous blood to the alveolar capillary membrane to allow release of waste CO2 and uptake of O2 depends on the integrity of the pulmonary circulation. Too little blood flow to the lungs and the patient is hypoxic; too much and the lungs become oedematous....

Predation on green sea turtle, Chelonia mydas, hatchlings by invasive rats

2019 ◽  
Vol 25 (4) ◽  
pp. 423 ◽  
Author(s):  
Markus Gronwald ◽  
Quentin Genet ◽  
Margaux Touron
Keyword(s):  
Food Source ◽  
Sea Turtles ◽  
Rattus Rattus ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
French Polynesia ◽  
Camera Traps ◽  
Green Sea Turtle ◽  
Green Sea Turtles ◽  
Invasive Rats

We used camera traps to identify invasive Rattus rattus as predators at a green sea turtle, Chelonia mydas, nest in French Polynesia. The footage shows that the hatchlings are a familiar food source for rats and that the control of invasive rats has to be considered for the protection of endangered green sea turtles.

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