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The fecundity of the mayfly Ephoron virgo in the River Rhine was studied over a period of twelve years (1992–2003) and compared to four European rivers in 1998. The field data were complemented by mass-rearing in flumes with fresh running river water (1999–2001). The dry mass of a single egg averaged to 4.15±0.25μg, without any significant spatial or temporal differences. Total egg mass per female...
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