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• W2028262814 abstract "The capitate and rectangular demes of the fresh- water epipelic diatom Sellaphora pupula (Kutz.) Mereschk. are dioecious, the first such report for any freshwater diatom. Sexual differentiation, which is probably determined genetically, involves recognition at the cell surface as well as differences in gamete behavior (one gametangium produces an active ''male'' gamete, the other a passive ''female'' gamete). In culture, successful sexual reproduction occurs only when compatible clones are mixed. All cells of a clone behave identically in interclonal crosses, being either male or female, regardless of the stage of the life cycle, in contrast to the se- quential hermaphroditism of centric diatoms. Males and females have identical frustule mor- phology. As in other diatoms, there is an upper size threshold for sexual reproduction, below which cells become progressively easier to sexualize. In culture, sexual interactions occur in cells much smaller than those ever seen in natural populations, so that in nature the sexual size range is effectively open. Natural populations almost always contain sexualizable cells; often, most of the cells are be- low the upper sexual size threshold. Male gametan- gia are, on average, slightly larger than females in the capitate deme, which may be produced by pref- erential polyandry, depleting the population of males and making them younger at mating. Rarely, selfing occurs producing zygotes, but these abort before producing initial cells. The sizes of the gam- etangia and initial cells are correlated but this does not invalidate the use of ''cardinal points'' of the life cycle in taxonomy. No interbreeding occurs be- tween the rectangular and capitate demes. Howev- er, when males of one deme are mixed with fe- males of the other, there is a stimulation of activity, as during the early stages of pairing in compatible intrademic crosses." @default.
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• W2028262814 date "1999-02-01" @default.
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• W2028262814 title "SEXUALITY, INCOMPATIBILITY, SIZE VARIATION, AND PREFERENTIAL POLYANDRY IN NATURAL POPULATIONS AND CLONES OF SELLAPHORA PUPULA (BACILLARIOPHYCEAE)" @default.
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• W2028262814 doi "https://doi.org/10.1046/j.1529-8817.1999.3510152.x" @default.
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