To investigate spatial gradients in population trends of European birds in relation to their association with farmland, dietary dependence on insects, and the intensity of agricultural practices.

中文翻译：

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欧洲全栖息地食虫性鸟类的大陆范围梯度下降，追踪了整个欧洲农业强度的空间格局

调查与鸟类与农田的关系，对昆虫的饮食依赖性以及农业实践强度有关的欧洲鸟类种群趋势的空间梯度。