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The vaterite cover on the eggs of Anhinga anhinga and its effect on gas conductance (Aves: Anhingidae)
Author(s) -
Colacino J. M.,
Hamel P. B.,
Rahn H.,
Board R. G.,
Sparks N. H. C.
Publication year - 1985
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1985.tb05627.x
Subject(s) - vaterite , cover (algebra) , conductance , biology , eggshell , ecology , paleontology , physics , calcite , condensed matter physics , mechanical engineering , engineering , aragonite
The nature of the chalky cover of Anhinga eggshells and its effect on gas conductance were studied. The cover consisted of microscopic spheres of nearly pure CaCO 3 in the form of vaterite. The pore canals were unbranched with an inorganic cap (Board's type 3(a) (ii)). The cover acted as a resistance in series with the underlying calcitic shell and accounted for approximately 6% of the total conductance.