... 11 2012 © 2013. Published by The Company of Biologists Ltd 2013 sinus gland CHH osmoregulation season Gecarcoidea natalis The most widely studied crustacean neurohormone, crustacean hyperglycaemic hormone (CHH) has long been known to be centrally involved in regulation...

...Benjamin J. Allardyce; Stuart M. Linton; Reinhard Saborowski SUMMARY A 160 kDa enzyme with β-glucosidase activity was purified from the midgut gland of the land crab Gecarcoidea natalis . The enzyme was capable of releasing glucose progressively from cellobiose, cellotriose or cellotetraose...

...Stephen Morris; Ute Postel; Mrinalini; Lucy M. Turner; Jessica Palmer; Simon G. Webster SUMMARY The Christmas Island red crab Gecarcoidea natalis undergoes extreme changes in metabolic status, ranging from inactivity during the dry season, to a spectacular annual breeding migration at the start...

...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...

...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...

... reabsorption and osmotic status was investigated in the terrestrial crab Gecarcoidea natalis on Christmas Island. Confinement within field enclosures had no general effect on salt and water balance compared with crabs free in the rainforest but there were seasonal effects. Extracellular fluid volume was 27.9...

... investigated in the Christmas Island red crab Gecarcoidea natalis acclimated to drinking either freshwater (FW crabs) or 70% seawater (SW crabs). FW crabs released dilute P (mean[Cl - ] 8.8 mmol l -1 ). Drinking 70% seawater caused the mean [Cl - ] of the P to rise to 376 mmol l -1 over 5 days,approaching...

...Agnieszka M. Adamczewska; Stephen Morris ABSTRACT Gecarcoidea natalis is a land crab that migrates annually several kilometres to breed. The O 2 -binding properties of haemocyanin in G. natalis were investigated in vitro to test the idea that the O 2 -binding properties of the haemocyanin of land...

...Agnieszka M. Adamczewska; Stephen Morris ABSTRACT The terrestrial red crab Gecarcoidea natalis undertakes an annual breeding migration and must sustain locomotion for prolonged periods. The migrating crabs must travel a specific distance in a fixed time and can either walk at a constant speed...

...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...

...Agnieszka M. Adamczewska; Stephen Morris ABSTRACT The respiratory and circulatory physiology of exercising Christmas Island red crabs Gecarcoidea natalis were investigated with respect to their annual breeding migration. Red crabs were allowed to walk for up to 45 min. During this exercise period...

...Agnieszka M. Adamczewska; Stephen Morris ABSTRACT The respiratory and circulatory physiology of the terrestrial Christmas Island red crab Gecarcoidea natalis was investigated with respect to exercise in the context of its annual breeding migration. Red crabs were allowed to walk for predetermined...

... and evaginated lung linings. In all species, the lungs were extremely effective in oxygen uptake whilst the performance of the gills was inferior. An exception to this was Gecarcoidea natalis , which has gills highly modified for aerial gas exchange; its gills and lungs were equally efficient in O 2 uptake...