Seasonal changes in blood oxygen transport and acid–base status in the tegu lizard, Tupinambis merianae

2004 ◽  
Vol 140 (2) ◽  
pp. 197-208 ◽  
Author(s):  
Denis V. Andrade ◽  
Simone P. Brito ◽  
Luı́s Felipe Toledo ◽  
Augusto S. Abe
Keyword(s):  
Oxygen Transport ◽  
Seasonal Changes ◽  
Blood Oxygen ◽  
Acid Base ◽  
Acid Base Status ◽  
Tupinambis Merianae ◽  
Tegu Lizard

Acid-base changes in the fetal lamb before and after lung expansion

1963 ◽  
Vol 18 (5) ◽  
pp. 877-880 ◽  
Author(s):  
N. S. Assali ◽  
W. A. Manson ◽  
L. W. Holm ◽  
M. Ross
Keyword(s):  
Blood Oxygen ◽  
Acid Base ◽  
Blood Ph ◽  
Lung Expansion ◽  
Fetal Lamb ◽  
Before And After ◽  
The Status ◽  
Acid Base Status ◽  
Near Term ◽  
Fetal Acidosis

The acid-base status of the fetal lamb was studied in near-term pregnant ewes subjected to spinal anesthesia. The status of the fetus was compared to its mother and the changes which occur after the fetal lungs were ventilated with oxygen or nitrogen were investigated. The results show that: 1) the fetus in utero is in a state of metabolic acidosis in relation to the mother, 2) the acidosis does not seem to be related to the fetal blood pCO2, and 3) the acidosis may be aggravated by hypoxia. fetal acidosis; blood pH; blood oxygen; blood carbon dioxide; hypoxia; hyperoxia; sheep Submitted on March 20, 1963

Haemolymph oxygen transport and acid-base status in Glyptonotus antarcticus Eights

Polar Biology ◽  
1997 ◽  
Vol 18 (1) ◽  
pp. 10-15 ◽  
Author(s):  
N. M. Whiteley ◽  
E. W. Taylor ◽  
A. Clarke ◽  
A. J. El Haj
Keyword(s):  
Oxygen Transport ◽  
Acid Base ◽  
Acid Base Status

scholarly journals THE EFFECTS OF SEASONAL VARIATIONS IN TEMPERATURE ON EXTRACELLULAR ACID-BASE STATUS IN A WILD POPULATION OF THE CRAYFISH AUSTROPOTAMOBIUS PALLIPES

1993 ◽  
Vol 181 (1) ◽  
pp. 295-311
Author(s):  
N. M. Whiteley ◽  
E. W. Taylor
Keyword(s):  
Seasonal Variations ◽  
Low Temperatures ◽  
Seasonal Changes ◽  
Wild Population ◽  
Late Summer ◽  
Co2 Solubility ◽  
Acid Base ◽  
Austropotamobius Pallipes ◽  
Ph Values ◽  
Acid Base Status

Between February 1990 and February 1991, a wild population of Austropotamobius pallipes (L.) inhabiting a large, shallow, freshwater pool in Staffordshire, central England, experienced environmental fluctuations in water temperature (1–21°C) and pH (8.2-9.5). Moulting was seasonal, with crayfish entering pre- and postmoult between May and August. Haemolymph pHa levels declined in the spring when temperatures increased from 8 to 18°C (deltapH/deltat=−0.013 pH units°C-1). This decrease was accompanied by a fall in [HCO3-] (of 4.12 mmol l-1) and [lactate] (of 4.71 mmol l-1) and a premoult elevation in PCO2 to 0.59 kPa. After ecdysis, when water temperatures and pH were at their maxima, pHa levels increased, they continued to increase as temperature fell in late summer, reaching 7.97 in intermoult crayfish at 13°C during September. This increase was accompanied by a decrease in PCO2 to 0.22 kPa at constant [HCO3-] (5–6 mmol l-1). Between September (13°C) and October (11°C) pHa fell to 7.87 with an elevation in PCO2 (of 0.18 kPa) and [lactate] (of 1.84 mmol l-1). As temperature continued to decrease (11–1°C), pHa remained unchanged despite an elevation in [HCO3-] by 2.4 mmol l-1 at constant PCO2. A mechanism accounting for the unvarying haemolymph pH values at low temperatures is proposed, stressing the importance of temperature-related seasonal changes in CO2 solubility and measured values for pK1′ in addition to adjustments in [HCO3-] and PCO2. These were apparently unaffected by changes in collecting and holding protocols.

The Effects of Hypercapnia on the Arterial Acid-Base Status in the Tegu Lizard, Tupinambis Nigropunctatus

1986 ◽  
Vol 122 (1) ◽  
pp. 13-24
Author(s):  
M. L. GLASS ◽  
N. HEISLER
Keyword(s):  
Initial Increase ◽  
Acid Base ◽  
Air Breathing ◽  
Typical Response ◽  
Acid Base Status ◽  
Arterial Plasma ◽  
Tegu Lizard

The effects of hypercapnia on the arterial acid-base status of the Tegu lizard, Tupinambis nigropunctatus (Spix), were studied at 25°C. Arterial PCOCO2 increased over the first 2 h of hypercapnia causing a fall in arterial plasma pH (pHa) of about 0.17 units with ≈4% CO2 and about 0.3 units with ≈7% CO2. In both conditions, plasma pH increased slightly (≈0.02units) between 2 and 72 h. Plasma [HCO3−] rose during the initial increase of PaCOCO2 (by approx. 5.5 mmol with ≈7% CO2; approx. 1.9 mmoll−1 with ≈4% CO2) during the first 2h, and further increased by 4 mmoll−1 between 2 and 72 h of hypercapnia, while PaCOCO2 did not change. The increases of plasma [HCO3−] resulted in a recovery of pH, by 38 or 32 % (≈4 and ≈7% CO2, respectively) relative to the fall of pH, that would occur at constant [HCO3−]. The limited and incomplete compensation of pHa during environmental hypercapnia is consistent with data for other air-breathing ectothermic vertebrates, and contrasts with the typical response of water-breathing fish, in which compensation is usually complete. Note:

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