首页> 外文OA文献 >Sexual and reproductive behaviour of Drosophila melanogaster from a microclimatically interslope differentiated population of 'Evolution Canyon' (Mount Carmel, Israel).
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Sexual and reproductive behaviour of Drosophila melanogaster from a microclimatically interslope differentiated population of 'Evolution Canyon' (Mount Carmel, Israel).

机译:果蝇的果蝇和性行为来自“进化峡谷”(以色列卡梅尔山)的小气候间坡分化种群。

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摘要

The strong microscale interslope environmental differences in "Evolution Canyon" provide an excellent natural model for sympatric speciation. Our previous studies revealed significant slope-specific differences for a fitness complex of Drosophila. This complex involved either adaptation traits (tolerance to high temperature, different viability and longevity pattern) or behavioural differentiation, manifested in habitat choice and non-random mating. This remarkable differentiation has evolved despite a very small interslope distance (a few hundred metres only). Our hypothesis is that strong interslope microclimatic contrast caused differential selection for fitness-related traits accompanied by behavioural differentiation and reinforced by some sexual isolation, which started incipient speciation. Here we describe the results of a systematic analysis of sexual behaviour in a non-choice situation and several reproductive parameters of D. melanogaster populations from the opposite slopes of "Evolution Canyon". The evidence indicates that: (i) mate choice derives from differences in mating propensity and discrimination; (ii) females from the milder north-facing slope discriminate strongly against males of the opposite slope; (iii) both sexes of the south-facing slope display distinct reproductive and behavioural patterns with females showing increased fecundity, shorter time before remating and relatively higher receptivity, and males showing higher mating propensity. These patterns represent adaptive life strategies contributing to higher fitness.
机译:“进化峡谷”中极小尺度的斜坡间环境差异为同胞物种形成提供了极好的自然模型。我们以前的研究表明,果蝇的健身复合体存在明显的坡度特异性差异。这种复合体涉及适应性状(耐高温,不同的生存能力和寿命模式)或行为差异,表现在栖息地选择和非随机交配上。尽管非常小的斜坡间距(仅几百米),但这种显着差异仍在发展。我们的假设是,强烈的坡间微气候对比导致与健身相关的性状的差异选择,伴随着行为差异,并由于某种性隔离而增强,这开始了早期物种形成。在这里,我们描述了非选择情况下性行为的系统分析结果,以及“进化峡谷”对面的黑腹果蝇种群的几个繁殖参数。证据表明:(i)择偶是由于交配倾向和歧视而产生的; (ii)来自较缓和的北坡的雌性与有相反坡度的雄性有明显区别; (iii)朝南斜坡的两性都表现出明显的生殖和行为方式,其中雌性的繁殖力增强,交配前的时间较短,接受能力相对较高,雄性的交配倾向较高。这些模式代表了适应性生活策略,有助于提高身体素质。

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