Examining a possible advantage of diploidy in Potamopyrgus antipodarum in a phosphorus-limited environment
The persistence of sexual reproduction is a mystery in evolutionary biology. The benefits of reproducing asexually almost always outweigh the cost of reproducing sexually. The freshwater snail Potamopyrgus antipodarum is obligately sexual or asexual with asexual snails being either triploid or tetraploid polyploids. Polyploid genomes possess and require more phosphorus (P) per unit mass than their sexual conspecifics due to extra chromosomal set(s). We tested the hypothesis that an environment limited in P will favor faster growth in sexuals, and therefore favor sexual reproduction, in P. ...
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