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- W2741424110 abstract "Summary. The annual development of the gonads of Dreissena polymorpha was studied at three sampling sites in two lakes over 3 and 1 �89 years, respectively. A resting stage occurred after the last spawning in summer/ autumn. Oogenesis (accompanied by multiplying segmentation of the oogonia and early growth processes of its oocytes) restarted in specimens at least 1 year old at low temperatures (below 10 ~ C) during winter and early spring. At one location (Ffihlinger See) the onset of the spawning season was correlated with an increase of water temperatures above 12 ~ C. At 2m depth, two main spawning periods in May and August were normally recognized, the first at temperatures of 12-16 ~ C, the second at 16-21 ~ C. It was clearly demonstrated for the first time in Dreissena polymorpha that the oocytes became mature in successive cohorts within one gonad. A female mussel may spawn several times during the reproductive season. At 9 m depth, the onset of spawning also started at about 12 ~ C; this occurred in late summer, with two spawning periods within 1 month at a temperature range of 12-16 ~ C. At another location (Heider Bergsee) the size of the gonads and the oocytes was reduced during April of both years studied, when food supply was low simultaneously with rapidly rising water temperatures in this shallow lake. There was no spawning period during spring. The major spawning period was delayed until July (temperatures 19-22 ~ C). This shows (1) the synchronizing influence of low winter temperatures on the annual reproductive cycle and (2) a temperature threshold of at least 12 ~ C for the start of the spawning processes. The results are discussed with regard to the geographical limits of further spread of Dreissena polymorpha." @default.
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- W2741424110 date "1991-01-01" @default.
- W2741424110 modified "2023-09-27" @default.
- W2741424110 title "Dreissena polymorpha Pallas in lakes" @default.
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