Aquatic Gas Exchange in the Freshwater/Land Crab, Holthuisana Transversa
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منابع مشابه
Aquatic Gas Exchange in the Freshwater/ Land Crab, Holthuisana Transversa
Holthuisana transversa (von Martens), a freshwater/land crab from arid areas of Australia, is an efficient bimodal breather. In water, resting MO2 (1-65^molg"^") and Vw ( lS^mlg" 1 h") at 25°C were lower than in other aquatic crabs whilst percentage extraction of oxygen was quite high (47 %). MO2 was not regulated at low ambient PQ2 but could be increased at least three times during exercise. N...
متن کاملThe Role of the Gills and Branchiostegites in Gas Exchange in a Bimodally Breathing Crab, Holthuisana Transversa: Evidence for a Facultative Change in the Distribution of the Respiratory Circulation
The respiratory circulation was investigated in air-breathing and waterbreathing Holthuisana transversa von Martens by analysis of the distribution of radioactive microspheres injected into the haemocoel at seven locations. The gills and putative lungs (branchiostegites and membraneous thoracic walls) both trap approximately 90 % of the microspheres entrained in their afferent circulations. The...
متن کاملAerial Gas Exchange in Australian Freshwater/land Crabs of the Genus Holthuisana
Holthuisana valentula Riek and H. agassizi (Rathbun) both ventilate their lungs by lateral oscillations of the thoracic walls within the branchial chambers. Air enters and leaves the lungs via the prebranchial apertures and the Milne-Edwards apertures. At rest, active ventilation in H. transversa was low (0-95 mlg~^ h") and a high diffusional component was evident. After disturbance, VA rose to...
متن کاملWater Balance and Urine Production in the Australian Arid-zone Crab Holthuisana
The permeability to tritiated water (hourly exchange fraction = 0-164) and the rate of urine flow (0-47% body weight/day) are lower than recorded in other freshwater decapods. The calculated net osmotic water flux (2-71 % body weight/day) is 5 times the water output in the urine, indicating that there is extrarenal excretion of water. Water balance is maintained in the absence of urine producti...
متن کاملGas Exchange in the Loggerhead Sea Turtle
Pulmonary CO diffusion capacity ( D L C O ) , lung volume (VL), oxygen uptake (Vo ) 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 D L C O and Vo values in the loggerhead turtle are approximately twice those of non-varanid reptiles and about 25 %...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 1983
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.103.1.225