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Comparison of ion transportation before and after egg hatching in Amphinemura sp. (Plecoptera)
Author(s) -
YOSHIMURA MAYUMI,
YAMADA TSUYOSHI
Publication year - 2006
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/j.1365-3032.2006.00521.x
Subject(s) - hatching , biology , petri dish , ion , zoology , membrane , ecology , biochemistry , chemistry , microbiology and biotechnology , organic chemistry
An increase in egg size with embryonic development in stoneflies is believed to result from the uptake of water by osmosis. The present study aims to investigate whether a selective ion transport through egg membranes exists before hatching, and whether ions are released after hatching. Viable and nonviable egg masses are incubated in Petri dishes filled with water, and the concentrations of the ions F − , Cl − , SO 4 2− , NO 3 − , Na + , K − , Mg 2+ and Ca 2+ in the water are determined. The ion transport of an egg mass before and after hatching and a nonviable egg mass is then calculated. Before hatching, Cl − , SO 4 2− , NO 3 − , Na + , Mg 2+ and Ca 2+ are taken up from the surrounding water into the inner egg. These ions are selectively taken into the egg. After hatching, Cl − , SO 4 2− , Na + , Mg 2+ and Ca 2+ are released into the surrounding water. The amount of these ions released after hatching is lower than the amount taken up before hatching. Ions that are not released after hatching are considered to be used in embryonic development.