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Water‐balance in Developing Eggs of the Ak Grasshopper, Poekilocerus pictus (Acridoidea, Pyrgomorphidae)
Author(s) -
Parihar D. R.
Publication year - 1971
Publication title -
zeitschrift für angewandte entomologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0044-2240
DOI - 10.1111/j.1439-0418.1971.tb02089.x
Subject(s) - zoology , dry weight , body weight , chemistry , biology , horticulture , botany , endocrinology
The eggs of Poekilocerus pictus absorbed water from moist soil in which they were incubated at 30° C and 35° C. The mean wet weight of a single egg increased from 7.32 mg when freshly laid to 16.62 mg at the start of blastokinesis (half‐developed) and 18.31 mg when about to hatch (fully developed). Thus, the total increase of wet weight was 10.99 mg (150.1%). The mean dry weight of an egg decreased from 4.10 mg when freshly laid to 3.83 mg at blastokinesis and 3.33 mg when about to hatch. The total mean decrease was 0.77 mg (18.8%). The amount of water in an egg, in terms of wet weight of egg, increased during development by 37.9%. During the same period, the mean absolute weight of water in an egg increased from 3.21 mg in freshly laid egg to 14.97 mg in an egg about to hatch. Zusammenfassung Zum Wasserhaushalt der Eier der Heuschrecke Poekilocerus pictus Die Eier von Poekilocerus pictus nahmen bei 30 und 35° C Wasser aus dem feuchten Boden auf. Ihr mittleres Naßgewicht stieg dabei von 7,32 mg (frisch abgelegt) über 16,62 mg (Beginn der Blastokinesis) auf 18,31 mg (voll entwickelt). Das mittlere Trockengewicht nahm von 4,10 mg über 3,83 auf 3,33 mg ab. Der Wassergehalt des Eies in Beziehung zum Naßgewicht stieg während der Entwicklung um 37,9%. Während der gleichen Zeit nahm das mittlere absolute Gewicht des Wassers im Ei von 3,21 mg (frisch abgelegt) auf 14,97 mg (schlüpfreif) zu.

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