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- W2063820110 abstract "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) was similar in both groups. The rate of carbon dioxide excretion (MCO2) 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 μm. 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." @default.
- W2063820110 created "2016-06-24" @default.
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- W2063820110 date "2000-07-01" @default.
- W2063820110 modified "2023-10-15" @default.
- W2063820110 title "Bimodal breathing in the estuarine crab Chasmagnathus granulatus Dana 1851 — physiological and morphological studies" @default.
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- W2063820110 doi "https://doi.org/10.1016/s1095-6433(00)00216-6" @default.
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