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STARVATION-INDUCED ALTERATIONS OF THE ULTRASTRUCTURE OF THE MIDGUT OF DAPHNIA MAGNA STRAUS, 1820 (CLADOCERA)

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ABSTRACT Fifteen-day old, well-fed female Daphnia magna were starved and the response of enterocytes of the anterior midgut was monitored at the ultrastructural level. The predominant features were depletion of lipid and glycogen reserves, swelling of mitochondria, reduction of rough endoplasmic reticulum and dictyosomes, and decrease of cell height to one-fifth of the height at the beginning of starvation. Intense degradation of organelles began after 4 days of starvation when whole body energy resources were depleted, as confirmed by biochemical analysis in parallel. Compared to other zooplankton species, the low ability of D. magna to survive periods of food deprivation is caused by the strategy of Daphnia to allocate energy to reproduction.

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/content/journals/10.1163/193724090x00267
1990-01-01
2016-12-11

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