Manenti Tommaso, Pertoldi Cino, Moghadam Neda Nasiri, Schou Mads Fristrup, Kjærsgaard Anders, Cavicchi Sandro, Loeschcke Volker
Department of Bioscience, Genetics, Ecology and Evolution, Aarhus University, Ny Munkegade 114-116, Buildg. 1540, 8000, Aarhus C, Denmark,
Behav Genet. 2015 Jan;45(1):127-34. doi: 10.1007/s10519-014-9683-5. Epub 2014 Sep 25.
The ability to move is essential for many behavioural traits closely related to fitness. Here we studied the effect of inbreeding on locomotor activity (LA) of Drosophila melanogaster at different ages under both dark and light regimes. We expected to find a decreased LA in inbred lines compared to control lines. We also predicted an increased differentiation between lines due to inbreeding. LA was higher in the dark compared to the light regime for both inbred and outbred control lines. As expected, inbreeding increased phenotypic variance in LA, with some inbred lines showing higher and some lower LA than control lines. Moreover, age per se did not affect LA neither in control nor in inbred lines, while we found a strong line by age interaction between inbred lines. Interestingly, inbreeding changed the daily activity pattern of the flies: these patterns were consistent across all control lines but were lost in some inbred lines. The departure in the daily pattern of LA in inbred lines may contribute to the inbreeding depression observed in inbred natural populations.
移动能力对于许多与适应性密切相关的行为特征至关重要。在此，我们研究了近亲繁殖对黑腹果蝇在不同年龄、黑暗和光照条件下的运动活性（LA）的影响。我们预期与对照品系相比，近交系的LA会降低。我们还预测由于近亲繁殖，品系间的差异会增加。对于近交和非近交对照品系，黑暗条件下的LA均高于光照条件。正如预期的那样，近亲繁殖增加了LA的表型方差，一些近交系的LA高于对照品系，而另一些则低于对照品系。此外，年龄本身在对照品系和近交系中均未影响LA，然而我们发现近交系中存在强烈的品系与年龄交互作用。有趣的是，近亲繁殖改变了果蝇的日常活动模式：这些模式在所有对照品系中都是一致的，但在一些近交系中却消失了。近交系中LA日常模式的偏离可能导致在近交自然种群中观察到的近亲繁殖衰退。
