PT  - JOURNAL ARTICLE
AU  - Bogart, JP
AU  - Elinson, RP
AU  - Licht, LE
TI  - Temperature and sperm incorporation in polyploid salamanders
AID  - 10.1126/science.2587986
DP  - 1989 Nov 24
TA  - Science
PG  - 1032--1034
VI  - 246
IP  - 4933
4099  - http://science.sciencemag.org/content/246/4933/1032.short
4100  - http://science.sciencemag.org/content/246/4933/1032.full
SO  - Science1989 Nov 24; 246
AB  - Although most animals reproduce sexually, a number of all-female groups exist. Triploid hybrid salamanders appear to maintain themselves by using a male's sperm to activate their eggs, after which the sperm nucleus is eliminated (gynogenesis). The incidence of sperm nuclear incorporation in eggs of these salamanders depends on temperature. Triploid offspring derived gynogenetically are more frequent at lower temperature, whereas tetraploid offspring derived sexually are far more frequent at higher temperatures. Temperature-dependent variability in sperm nuclear incorporation helps explain the variability in reproductive modes reported for hybrid salamanders.