caa a22 4500 469096284 CHVBK 20180323133031.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF00317375 doi (NATIONALLICENCE)springer-10.1007/BF00317375 McLetchie D. Graduate Program in Ecology, The University of Tennessee, 108 Hoskins, 37996-1161, Knoxville, TN, USA aut Sex ratio from germination through maturity and its reproductive consequences in the liverwort Sphaerocarpos texanus [Elektronische Daten] [D. McLetchie] Summary: The dioecious winter ephemeral liverwort, Sphaerocarpos texanus disperses spore tetrads consisting of two males and two females. I examined the subsequent sex ratio of S. texanus at different stages in its life cycle to detect possible mechanisms affecting deviations from a 1:1 sex ratio and the effect of sex ratio on reproductive success. As S. texanus occurs in pure male, pure female and mixed sex clumps, I examined the proportions and sizes of these, the reproductive success of pure female and mixed sex clumps in the field and the sex ratio of germinating plants in a growth chamber. In both the field and the growth chamber the most abundant clump type was pure female followed by mixed sex and pure male clumps. These abundance patterns suggest that males have a lower survival rate than females before emergence and this lower survival rate continues through the gametophytic stage. This disadvantage may be due to the higher susceptibility of males to environmental conditions, to their competitive inferiority to females, and/or to differential resource allocation to the sexes within the spore tetrad. The female biased sex ratio at germination is consistent with predictions from sex ratio theory. Further my field data indicate that males may gain a survival benefit from growing in a mixed sex clump and both males and females benefit reproductively when they occur in mixed sex clumps. Springer-Verlag, 1992 Sex ratio nationallicence Germination nationallicence Reproductive success nationallicence Bryophytes nationallicence Sphaerocarpos texanus nationallicence Oecologia Springer-Verlag 92/2(1992-11-01), 273-278 0029-8549 92:2<273 1992 92 442 https://doi.org/10.1007/BF00317375 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317375 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- McLetchie D. Graduate Program in Ecology, The University of Tennessee, 108 Hoskins, 37996-1161, Knoxville, TN, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 92/2(1992-11-01), 273-278 0029-8549 92:2<273 1992 92 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer