Comparison of ion transportation before and after egg hatching in Amphinemura sp. (Plecoptera) |
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| Authors: | MAYUMI YOSHIMURA TSUYOSHI YAMADA |
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| Institution: | Forest Conservation and Management Group, Kansai Research Center, Forestry and Forest Products Research Institute, Kyoto, Japan;and Forestry and Forest Products Research Institute, Norin Kenkyu Danchi, Japan |
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| Abstract: | Abstract. 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?, SO42?, NO3?, Na+, K?, Mg2+ and Ca2+ 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?, SO42?, NO3?, Na+, Mg2+ and Ca2+ are taken up from the surrounding water into the inner egg. These ions are selectively taken into the egg. After hatching, Cl?, SO42?, Na+, Mg2+ and Ca2+ 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. |
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| Keywords: | Egg hatching egg swelling ion membrane stoneflies |
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