RT Journal Article
SR Electronic
T1 Temperature and sperm incorporation in polyploid salamanders
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1032
OP 1034
DO 10.1126/science.2587986
VO 246
IS 4933
A1 Bogart, JP
A1 Elinson, RP
A1 Licht, LE
YR 1989
UL http://science.sciencemag.org/content/246/4933/1032.abstract
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.