VARIABLE SELECTION AND SIZE-RELATED MATING PATTERNS IN NATURAL-POPULATIONS OF ELAPHROTHRIPS-TUBERCULATUS - A PATH-ANALYSIS
VARIABLE SELECTION AND SIZE-RELATED MATING PATTERNS IN NATURAL-POPULATIONS OF ELAPHROTHRIPS-TUBERCULATUS - A PATH-ANALYSIS
复制标题
DOI：
10.2307/2425691
复制
发表时间：
1989-07-01
影响因子：
0.6
通讯作者：
CRESPI, BJ
中科院分区：
文献类型：
--
作者：
CRESPI, BJ
在结节锦蓟马（Elaphrothrips tuberculatus）中，6年的研究揭示了对体型较大的雄性进行性选择的强度、“潜行”的非守卫雄性和其他非守卫雄性之间的标准化体型差异，以及体型选型交配的程度，每年都有显着的变化。多年来，对体型较大的雄性的性选择强度与性别比（雄性百分比）和操作性性别比（产蛋雌雄之比）呈正相关，潜行性与其他非守卫性雄性之间的体型差异与性别比呈正相关。变量之间关系的通径分析表明：（1）雄性体型相关的交配模式主要受性别比例的影响； （2）高度选型交配与高性选择强度有关，大型卵生雌性比较小的卵生雌性更早开始繁殖的强烈趋势，亚种群中雄性和雌性的平均大小（悬挂的枯死橡树叶簇）之间的高度相关性，以及亚种群中雌雄配对的平均数量较低； (3)交配模式的年度变化最终可能是由前一年夏季繁殖量的年度变化、冬季死亡率模式的年度变化以及春季传播率和雌性繁殖时间的年度变化引起的。
In Elaphrothrips tuberculatus, a thrip with male post-copulatory mate guarding, 6 years of study revealed substantial yearly variation in the intensity of sexual selection for large male body size, the standardized size difference between "sneak" nonguarding males and other nonguarding males, and the magnitude of size-assortative mating. Among years, the intensity of sexual selection for large male body size was positively correlated with the sex ratio (percent males) and the operational sex ratio (ratio of males to females on eggs), and the size difference between sneak and other nonguarding males was positively correlated with the sex ratio. Path analysis of the relationships among variables indicated that: (1) male size-related mating patterns were influenced primarily by the sex ratio; (2) a high magnitude of size-assortative mating was associated with a high sexual selection intensity, a strong tendency for large oviparous females to initiate breeding earlier than smaller ones, a high correlation between the average sizes of males and females among subpopulations (clusters of hanging dead oak leaves), and a low average number of male-female pairs in subpopulations; and (3) yearly variation in mating patterns may be ultimately caused by yearly variation during the previous summer in amount of breeding, yearly variation during winter in mortality patterns and yearly variation during spring in dispersal rates and the timing of female breeding.