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Nitrogenous excretion in the amphibious crab Holthuisana transversa under wet and dry conditions

journal contribution
posted on 1995-11-01, 00:00 authored by Stuart Linton, P Greenaway
The main route of nitrogen excretion in Holthuisana transversa with access to water was across the gills. Ammonia excreted into the water in this way accounted for 72.2-85.9% of total nitrogen excreted. The feces, any excretory fluid released by the crab, and volatilization of ammonia gas were minor routes of excretion. Total nitrogen excretion ranged from 7.75 ± 3.24 SD μmol kg-1· h-1 for starved animals to 36.38 ± 33.36 SD μmol kg-1· h-1 for animals on a high nitrogen diet. Under simulated drought conditions (starved with no access to water) Holthuisana transversa excreted negligible amounts of nitrogen (0.23 ± 0.41 μmol kg-1· h-1). Reduced protein catabolism may have been facilitated by the use of fat for energy and a reduction in the metabolic rate. Any waste nitrogen that was produced was probably stored. Urate was stored in the body of Holthuisana transversa and the total body urate content was high (up to 40.41 mmol· kg-1). Given the low solubility of urate, the bulk of these reserves must have been in solid form.

History

Journal

Journal of crustacean biology

Volume

15

Issue

4

Pagination

633 - 644

Publisher

Oxford University Press

Location

Oxford, Eng.

ISSN

0278-0372

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1995, Oxford University Press