...Ute Postel; Fiona Thompson; Gary Barker; Mark Viney; Steve Morris SUMMARY During their annual breeding migration the Christmas Island land crab Gecarcoidea natalis sustains locomotion aerobically for up to 12 h per day compared with just 10 min during the dry season when their muscles quickly...

...Benjamin J. Allardyce; Stuart M. Linton SUMMARY Laminarinase and endo-β-1,4-glucanase were purified and characterised from the midgut gland of the herbivorous land crab Gecarcoidea natalis and the crayfish Cherax destructor . The laminarinase isolated from G. natalis was estimated to have...

.... Migrating G. natalis also exhibited low and constant haemolymph lactate levels ( Adamczewska and Morris,2001b ) and this may be a feature of gecarcinid land crabs. The elevated O 2 demand of migrating crabs (Feb) compared with those confined to around the freshwater springs in June is reflected...

...Stuart M. Linton; Peter Greenaway SUMMARY Digestive juice from the herbivorous gecarcinid land crabs Gecarcoidea natalis and Discoplax hirtipes exhibited total cellulase activity and activities of two cellulase enzymes; endo-β-1,4-glucanase and β-1,4-glucosidase. These enzymes hydrolysed native...

... of SW crabs. * Author for correspondence (e-mail: [email protected] ) 11 7 2002 © The Company of Biologists Limited 2002 2002 Gecarcoidea natalis land crab osmoregulation chloride reabsorption excretion dopamine cyclic AMP gill Although crabs...

...Stephen Morris ABSTRACT Gills are the primary organ for salt transport, but in land crabs they are removed from water and thus ion exchanges, as well as CO 2 and ammonia excretion, are compromised. Urinary salt loss is minimised in land crabs by redirecting the urine across the gills where salt...

... with an acute surfeit of salt. * e-mail: [email protected] 25 10 1999 22 12 1999 © 2000 by Company of Biologists 2000 Birgus latro land crab salt osmoregulation dopamine cyclic AMP gill The osmoregulatory problems of terrestrial crabs differ...

...Stuart M. Linton; Peter Greenaway ABSTRACT The urate content of the gecarcinid land crab Gecarcoidea natalis was correlated to the amount of nitrogen assimilated. Crabs fed a high-nitrogen diet ( ad libitum amounts of soy beans and fig leaves, Ficus macrophylla ) for 6 weeks assimilated...

... ammonia excretion is achieved by volatilisation of NH3 from the branchial fluid. High partial pressures of ammonia in the branchial fluid are produced by apical Na + /NH 4 + exchange and elevation of the pH. 14 01 1994 ©The Company of Biologists Limited 1994 land crab nitrogen...

... cease with the onset of locomotion ( Smatresk and Cameron, 1981 ; Herreid et al . 1983 ; Morris and Taylor, 1984 , 1985 ). The Christmas Island red crab Gecarcoidea natalis must, like many other land crabs, complete an annual breeding migration to the ocean. The red crab may need to walk...

... and all data are presented as mean ± S.E.M., unless otherwise stated. Pulmonary blood carbon dioxide content (mmol l −1 ) Arterial blood carbon dioxide content (mmol l −1 ) 15 11 1993 ©The Company of Biologists Limited 1994 land crab Gecarcoidea natalis...

... in these experiments were noticeably small and this may well account for the differences seen between the two studies. © 1990 by Company of Biologists 1990 land crab osmoregulation urine Birgus The water available to terrestrial animals is generally dilute and ionic requirements are filled...

... for reprint requests. 26 06 1986 © 1986 by Company of Biologists 1986 dehydration land crab acid-base respiration ionoregulation nitrogenous wastes Dehydration is thought to be the single most important factor limiting the success of decapod crustaceans on land ( Powers...

... the thoracic sinus as a whole nor the infrabranchial sinuses can be considered as reservoirs of truly mixed venous blood in H. transversa . 03 02 1984 © 1984 by Company of Biologists 1984 Land crab gas exchange respiratory circulation The crab Holthuisana transversa...

... showing the pattern of ventilation in resting crabs. A, a large crab (30g) B, small crab ( 13·6g). Records are for the left lung only. 16 08 1981 20 09 1982 © 1983 by Company of Biologists 1983 Gas exchange Holthuisana land crab Many groups of marine brachyurans...