Abstract Studies at the landscape scale are important to understand insect population and community dynamics. Despite numerous studies on the effects of landscape context on phytophagous insect communities, few studies were conducted on fruit flies and the seasonal variation in the effects of landscape context remains poorly explored. Here, we investigate how landscape composition affects Drosophilidae communities in vineyards and how these effects vary over time. To do this, we sampled Drosophilidae communities in 20 vineyards selected along a gradient of proportion cover of semi-natural habitats in the landscape over a whole year in southwestern France. We found an overall positive effect of increasing proportion of semi-natural habitats in the landscape on abundance of drosophilid species but not on the rarefied species richness. We also found strong seasonal changes in community composition with a major temporal differentiation between the two dominant species of the community, Drosophila subobscura and Drosophila suzukii. Our study revealed that the composition of the Drosophilidae communities in vineyards is strongly influenced by the proportion of semi-natural habitats and the time of year. Our results suggest that the variation in space and time of key resources such as host plants or overwintering habitats in the landscape is a key factor affecting community composition of Drosophilidae in crops.

中文翻译：

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葡萄栽培景观中果蝇科群落的季节性变化。

摘要 景观尺度的研究对于了解昆虫种群和群落动态很重要。尽管对景观环境对植食性昆虫群落的影响进行了大量研究，但对果蝇的研究很少，而且对景观环境影响的季节性变化的探索也很少。在这里，我们调查景观组成如何影响葡萄园中的果蝇群落，以及这些影响如何随时间变化。为此，我们在法国西南部一整年中沿景观中半自然栖息地的覆盖比例梯度选择的 20 个葡萄园中的果蝇群落进行了采样。我们发现景观中半自然栖息地比例的增加对果蝇物种的丰度有总体的积极影响，但对稀有物种的丰富度没有影响。我们还发现群落组成的强烈季节性变化，群落的两个主要物种 Drosophila subobscura 和 Drosophila suzukii 之间存在主要的时间差异。我们的研究表明，葡萄园中果蝇科群落的组成受半自然栖息地的比例和一年中的时间的影响很大。我们的研究结果表明，景观中寄主植物或越冬栖息地等关键资源的空间和时间变化是影响作物果蝇科群落组成的关键因素。我们的研究表明，葡萄园中果蝇科群落的组成受半自然栖息地的比例和一年中的时间的影响很大。我们的研究结果表明，景观中寄主植物或越冬栖息地等关键资源的空间和时间变化是影响作物果蝇科群落组成的关键因素。我们的研究表明，葡萄园中果蝇科群落的组成受半自然栖息地的比例和一年中的时间的影响很大。我们的研究结果表明，景观中寄主植物或越冬栖息地等关键资源的空间和时间变化是影响作物果蝇科群落组成的关键因素。