De Meester Luc
Laboratory of Animal Ecology, University of Ghent, K.L. Ledeganckstraat 35, 9000, Gent, Belgium.
Oecologia. 1993 Oct;96(1):80-84. doi: 10.1007/BF00318033.
Egg-to-adult viability of sexual offspring in Daphnia magna is lower for selfed (average: 43.0%) than for outcrossed families (average: 74.7%). This suggests that intraclonal mating is not the rule in Daphnia populations. For a given family, hatching rate of eggs resulting from interpopulation crosses is lower than for intrapopulation crosses. This breakdown in hatching responses may result in the effective gene flow between Daphnia populations being severely reduced, offering an explanation for the apparent paradox of genetic differentiation of Daphnia populations in spite of efficient dispersal.
大型溞有性后代从卵到成体的存活率，自交的（平均为43.0%）低于杂交家系（平均为74.7%）。这表明克隆内交配在大型溞种群中并非普遍现象。对于给定的家系，种群间杂交产生的卵的孵化率低于种群内杂交。这种孵化反应的破坏可能导致大型溞种群间的有效基因流动严重减少，这为尽管有高效扩散但大型溞种群仍存在明显遗传分化这一矛盾现象提供了解释。
