Krams Indrikis A, Krama Tatjana, Krams Ronalds, Trakimas Giedrius, Popovs Sergejs, Jõers Priit, Munkevics Maris, Elferts Didzis, Rantala Markus J, Makņa Jānis, de Bivort Benjamin L
Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia.
Department of Zoology and Animal Ecology, Faculty of Biology, University of Latvia, Riga, Latvia.
Front Behav Neurosci. 2021 Apr 16;15:659331. doi: 10.3389/fnbeh.2021.659331. eCollection 2021.
When organisms' environmental conditions vary unpredictably in time, it can be advantageous for individuals to hedge their phenotypic bets. It has been shown that a bet-hedging strategy possibly underlies the high inter-individual diversity of phototactic choice in . This study shows that fruit flies from a population living in a boreal and relatively unpredictable climate have more variable variable phototactic biases than fruit flies from a more stable tropical climate, consistent with bet-hedging theory. We experimentally show that phototactic variability of is regulated by the neurotransmitter serotonin (5-HT), which acts as a suppressor of the variability of phototactic choices. When fed 5-HT precursor, boreal flies exhibited lower variability, and they were insensitive to 5-HT inhibitor. The opposite pattern was seen in the tropical flies. Thus, the reduction of 5-HT in fruit flies' brains may be the mechanistic basis of an adaptive bet-hedging strategy in a less predictable boreal climate.
当生物体的环境条件随时间发生不可预测的变化时，个体采取多样化的表型策略可能会更具优势。研究表明，多样化策略可能是导致[具体生物名称]光趋性选择中个体间高度差异的原因。本研究表明，生活在北方且气候相对不可预测的种群中的果蝇，比生活在更稳定的热带气候中的果蝇具有更大的光趋性偏差变化，这与多样化策略理论一致。我们通过实验表明，[具体生物名称]的光趋性变化受神经递质血清素（5-HT）调节，血清素作为光趋性选择变化的抑制剂。当给北方果蝇喂食5-HT前体时，它们的变化性降低，并且对5-HT抑制剂不敏感。热带果蝇则呈现相反的模式。因此，果蝇大脑中5-HT的减少可能是在较不可预测的北方气候中适应性多样化策略的机制基础。
