The Willow Ptarmigan (Lagopus lagopus), is a circumpolar distributed game bird that has been subjected to a long‐term population decline in northern Fennoscandia. Increased abundance of mesopredators and changed food web dynamics appear to underlie this decline (see page 104). Photo:© Rolf A. Ims

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封面图片和发行信息

杨柳雷鸟（Lagopus lagopus）是一种极地分布的猎鸟，在芬诺斯坎迪亚北部遭受了长期的种群减少。介壳虫数量的增加和食物网动态的变化似乎是造成这种下降的原因（见第104页）。照片：©Rolf A. Ims