EFFECT OF AGE AT 1ST MATING ON PRIMARY SEX-RATIO OF THE 2-SPOTTED SPIDER-MITE
EFFECT OF AGE AT 1ST MATING ON PRIMARY SEX-RATIO OF THE 2-SPOTTED SPIDER-MITE
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DOI：
10.1007/bf01193426
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发表时间：
1990-10-01
影响因子：
2.2
通讯作者：
CAREY, JR
中科院分区：
文献类型：
--
作者：
KRAINACKER, DA;CAREY, JR
本文测定了交配初龄对二斑叶螨初级性比的影响。具体的问题是，在蜕皮之后交配的雌性，或者在蜕皮时由固定年龄的处女雄性授精的雌性，是否有不同于对照雌性在蜕皮时由随机年龄的雄性交配的后代。雌鼠初次交配年龄对存活率没有影响。在蜕皮期交配的雌性比在5日龄或10日龄交配的雌性产生更多的女儿。然而，在交配后，所有雌性处理的女儿产量是相等的。无论何时交配，所有处理都在大致相同的年龄停止生育女儿。在蜕皮期交配的雌性，产子最少。然而，5日龄或10日龄交配的雌性比蜕皮时交配的雌性产子少。交配时的雄性年龄不影响雌性的存活。与出生1天或7天的处男接触的雌性比接触11天或20天的雄性的雌性生出更多的女儿。然而，在后一组中，有相当大比例的女性没有交配。如果只考虑交配的雌性，那么在所有的队列中，女儿的产量是相同的。第一次交配的延迟年龄只通过雌性影响性别比，特别是通过女儿产量的变化(而不是存活率的变化)。本应在蜕皮和交配之间产生的女儿，在蜕皮之后交配的雌性再也找不到了。因此，从性别比的角度来看，这些女儿“迷失了”。雄性交配的初始年龄不会改变性别比。
This paper determines the influence of initial age at mating on the primary sex-ratio of the two-spotted spider mite Tetranychus urticae Koch. The specific question asked is whether females that mate at ages beyond ecdysis, or are inseminated at ecdysis by virgin males of set ages, have daughter productions different from control females mated at ecdysis by randomly aged males. Age of initial female mating did not effect survival. Females mated at ecdysis produced more daughters than those mated at age 5 or 10 days. However, daughter production was equal for all female treatments in the post-mating period. All treatments stopped producing daughters at approximately the same age, regardless of when mated. Son production was lowest for females mated at ecdysis. However, son production by females mated when 5 or 10 days old was lower than that of females mated at ecdysis. Male age at mating did not affect female survival. Females exposed to virgin males either 1 or 7 days old produced more daughters than those exposed to males either 11 or 20 days of age. However, a substantial proportion of females in these latter cohorts were not mated. If only mated females are considered, daughter production is the same between all cohorts. Delayed age at first mating influenced sex-ratio only via the females, specifically by changes in daughter production (as opposed to changes in survivorship). Daughters that would have been produced between ecdysis and mating were never recovered by females that mated at ages beyond ecdysis. Thus, these daughters were ''lost'' from a sex-ratio viewpoint. Initial age of male mating did not change sex-ratio.