Ishida Takahide A, Hattori Kouhei, Shibata Satoshi, Suzuki Mayuko, Kimura Masahito T
Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Japan.
J Plant Res. 2005 Jun;118(3):193-7. doi: 10.1007/s10265-005-0206-6. Epub 2005 May 21.
Sex allocation of a cosexual wind-pollinated species, Quercus dentata (Fagaceae), was analyzed using biomass, carbon, nitrogen and phosphorus as currencies based on data accumulated for 61 individuals from 1997-2004. Strongly female-biased sex allocation was indicated when measured in terms of biomass and carbon, but no significant bias was detected when measured in terms of nitrogen or phosphorus. From an adaptive viewpoint, there is little support for strong female-biased sex allocation, suggesting that sex allocation in terms of nitrogen or phosphorus is closer to the real picture. The relative sex allocation considerably varied from year to year, but the relative femaleness of individuals in the population was rather constant across years. No significant correlation was observed between relative sex allocation and fecundity or tree height, but individuals that showed very low fecundity tended to produce only acorns.
基于1997年至2004年期间对61株个体积累的数据，以生物量、碳、氮和磷为衡量指标，对雌雄同体的风媒传粉物种蒙古栎（壳斗科）的性别分配进行了分析。以生物量和碳衡量时，性别分配明显偏向雌性，但以氮或磷衡量时，未检测到显著偏差。从适应性的角度来看，几乎没有证据支持强烈的雌性偏向性别分配，这表明以氮或磷衡量的性别分配更接近实际情况。相对性别分配在不同年份有很大差异，但种群中个体的相对雌性在各年份相当稳定。相对性别分配与繁殖力或树高之间未观察到显著相关性，但繁殖力极低的个体往往只产生橡子。
