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- W2313305549 abstract "A NIMALS have evolved many methods by which they prevent or reduce the frequency of hybridization. A large proportion of the studies on these isolation mechanisms concern terrestrial organisms. The isolation mechanisms reported show a great array of methods by which animals are protected against hybridization (Mayr, 1942; Dobzhansky, 1951). Isolation mechanisms are often divided into those that occur before gamete release thus conserving gametes, and those that occur after mating, which involve a wastage of gametes (Muller, 1942; Littlejohn, 1960). The failure of pollen-tube growth in interspecific crosses between certain higher plants (Stebbins, 1950) somewhat bridges the gap between the two major categories in that it occurs before fertilization, involving a wastage of at least one gamete. This gamete wastage is not likely to be of major importance, as pollen production is much greater than ovule production. Most aquatic animals differ from terrestrial animals in that they require means of preventing chance meeting of gametes floating in the currents of the natural environment." @default.
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- W2313305549 date "1960-03-25" @default.
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- W2313305549 title "Duration of Sperm Function in the Percid Fishes Etheostoma lepidum and E. spectabile, Associated with Sympatry of the Parental Populations" @default.
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- W2313305549 doi "https://doi.org/10.2307/1439836" @default.
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