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Studies in the Calcium and Phosphorus Metabolism of the Crab, Podophthalmus vigil (Fabricius)

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Title:Studies in the Calcium and Phosphorus Metabolism of the Crab, Podophthalmus vigil (Fabricius)
Authors:Sather, Bryant T.
Date Issued:Apr 1967
Publisher:University of Hawai'i Press
Citation:Sather BT. 1967. Studies in the calcium and phosphorus metabolism of the crab, Podophthalmus vigil (Fabricius). Pac Sci 21(2): 193-209.
Abstract:By employing modifications of the molt classification by Drach
(1939) and Hiatt (1948), it was discovered in laboratory-maintained crabs (Podopbtbalmus
vigil) that a partial desiccation occurred during proecdysis followed
by a rehydration at the A stages.
The inorganic and organic content of the carapace, mid-gut gland, gills, and
muscles were followed during the molt cycle. The carapace had the greatest inorganic
fluctuations. The mid-gut gland and muscle tended to increase in both
organic and inorganic matter during premolt, suggesting that these organs may
serve as reservoirs for these components.
The calcium and total phosphorus constituents of these organs and of the blood
were determined at the various molt stages. Fluctuations in the amounts of these
two elements were observed in all sampled tissues. The storage of calcium in the
mid-gut gland and muscles during premolt is discussed. Phosphorus was found
to be stored in the digestive gland during postecdysis but not in proecdysis. The
muscle also tended to store phosphorus during premolt.
As P. vigil becomes older, i.e., larger, it is unable to resorb from the exoskeleton
the same quantity of calcium, but it is able to recalcify the new exoskeleton to the
same extent as does a smaller crab.
Appears in Collections: Pacific Science Volume 21, Number 2, 1967

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