INVESTIGADORES
LUQUET carlos Marcelo
artículos
Título:
Bimodal breathing in the estuarine crab Chasmagnathus granulatus Dana 1851. Physiological and morphological studies.
Autor/es:
HALPERIN, J., ANSALDO, M., PELLERANO, G; LUQUET, C.
Revista:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2000 vol. 126 p. 341 - 349
ISSN:
1095-6433
Resumen:
Chasmagnathus granulatus is an estuarine crab which actively moves from subtidal to supratidal areas. To elucidate the
possible existence of extrabranchial sites for aerial gas exchange, we measured respiratory and acid-base variables in
animals with and without branchial water (controls and experimental crabs, respectively) during air exposure. An
histological study of the branchiostegite was also performed. Throughout 4 h of emergence C. granulatus did not suffer
venous hypoxia, even without branchial water. The rate of oxygen uptake (MO2
venous hypoxia, even without branchial water. The rate of oxygen uptake (MO2
possible existence of extrabranchial sites for aerial gas exchange, we measured respiratory and acid-base variables in
animals with and without branchial water (controls and experimental crabs, respectively) during air exposure. An
histological study of the branchiostegite was also performed. Throughout 4 h of emergence C. granulatus did not suffer
venous hypoxia, even without branchial water. The rate of oxygen uptake (MO2
venous hypoxia, even without branchial water. The rate of oxygen uptake (MO2
is an estuarine crab which actively moves from subtidal to supratidal areas. To elucidate the
possible existence of extrabranchial sites for aerial gas exchange, we measured respiratory and acid-base variables in
animals with and without branchial water (controls and experimental crabs, respectively) during air exposure. An
histological study of the branchiostegite was also performed. Throughout 4 h of emergence C. granulatus did not suffer
venous hypoxia, even without branchial water. The rate of oxygen uptake (MO2
venous hypoxia, even without branchial water. The rate of oxygen uptake (MO2
C. granulatus did not suffer
venous hypoxia, even without branchial water. The rate of oxygen uptake (MO2O2
) was similar in both groups. The rate
of carbon dioxide excretion (MCO2CO2
) and the gas exchange ratio (R) significantly decreased during emergence in both
groups, with R significantly lower for experimental crabs. Consequently, CO2 was accumulated in the hemolymph. This
variable stabilized after 90 min in control animals, but experimental crabs continued accumulating CO2. Histological
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
variable stabilized after 90 min in control animals, but experimental crabs continued accumulating CO2. Histological
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
groups, with R significantly lower for experimental crabs. Consequently, CO2 was accumulated in the hemolymph. This
variable stabilized after 90 min in control animals, but experimental crabs continued accumulating CO2. Histological
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
variable stabilized after 90 min in control animals, but experimental crabs continued accumulating CO2. Histological
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
R) significantly decreased during emergence in both
groups, with R significantly lower for experimental crabs. Consequently, CO2 was accumulated in the hemolymph. This
variable stabilized after 90 min in control animals, but experimental crabs continued accumulating CO2. Histological
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
variable stabilized after 90 min in control animals, but experimental crabs continued accumulating CO2. Histological
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
R significantly lower for experimental crabs. Consequently, CO2 was accumulated in the hemolymph. This
variable stabilized after 90 min in control animals, but experimental crabs continued accumulating CO2. Histological
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
2. Histological
study of the branchiostegites demonstrated the presence of an attenuated and greatly perfused epithelium facing the
branchial chamber lumen, with a shortest diffusion distance of 0.5 mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
mm. Simple folds and lobulated projections increase
the respiratory surface area. These results suggest that C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.
C. granulatus is a bimodal breathing crab, active both in water
and air. When emerged, this species extract oxygen directly from air through branchiostegal lungs, but relies on branchial
exchange to eliminate carbon dioxide. © 2000 Elsevier Science Inc. All rights reserved.