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1. Crustaceans have a high content of calcium, which is chiefly located in the skeleton as calcium carbonate. Calcium is generally the most abundant cation in the body.
Terrestrial adaptations in the Anomura (Crustacea: Decapoda)
In this review, morphological, physiological and behavioural adaptations to life on land by anomurans are considered and coenobitids and Birgus do not carry molluscan shells after the juvenile stages and, freed from its constraints, reach larger size and have developed terrestrial adaptations that closely parallel those of the brachyuran land crabs. Expand
Insect-Like Olfactory Adaptations in the Terrestrial Giant Robber Crab
It is shown that the robber crab has evolved an olfactory sense with a high degree of resemblance to the insect system, and nicely illustrates how similar selection pressures result in similar adaptation. Expand
Nitrogenous Excretion in Two Terrestrial Crabs (Gecarcoidea natalis and Geograpsus grayi)
Gecarcoidea natalis and Geograpsus grayi are both ammonotelic but excrete ammonia by different routes and mechanisms. In G. natalis ammonium ions in the final excretory fluid (P) constitute 67. 7% ofExpand
The Effect of Moulting and Sodium Depletion on Sodium Transport and the Activities of Na+K+-ATPase, and V-ATPase in the Freshwater Crayfish Cherax destructor (Crustacea: Parastacidae)
A new model for sodium transport in freshwater crustaceans is proposed in which sodium enters the branchial epithelial cells from the water via sodium channels in the apical membrane, down an electrochemical gradient generated by outward translocation of protons by the V-ATPase. Expand
Salt and Water Balance in Field Populations of the Terrestrial Crab Gecarcoidea Natalis
The discrepancy between tritiated water and sodium turnovers in laboratory and field data indicated that field animals had a considerable reserve of osmoregulatory capacity. Expand
Sodium Balance and Adaptation to Fresh Water in the Amphibious Crab Cardisoma hirtipes
The crab has a reduced hemolymph concentration and permeability to ions and water compared to marine species, but permeability remains greater than in freshwater crustaceans. Expand
A review of feeding and nutrition of herbivorous land crabs: adaptations to low quality plant diets
This paper reviews the nutritional ecology, the digestive physiology, and biochemistry of herbivorous land crabs and the adaptations that they possess towards a diet of plant material. Land crabExpand
The effect of emersion on haemolymph acid-base balance and oxygen levels in Scylla serrata Forskal (Brachyura:Portunidae)
The rapid recovery of normal blood-gas and acid-base parameters during re-immersion suggests that survival in the fish markets could best be enhanced by a few hours of immersion in aerated seawater every 2 days. Expand