Research er, conducted by the Canadian Wildlife Service has found er, about a two-week advancement in spring weather and ice melt.

加拿大野生动植物中心的研究者调查发现，这里春季和冰层消融提前了约2个星期。

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Mark Mallory, along with two other scientists from the Canadian Wildlife Service, recently completed a survey that used fieldwork data spanning the last 33 years.

Mark Mallory与来自加拿大野生动物保护署的其他两位科学家最近完成了一个调查，这个调查所使用的野外数据跨度达到33年。

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Mark Mallory, along with two other scientists from the Canadian Wildlife Service, recently completed a survey that used fieldwork data spanning the last 33 years.

Mark Mallory与来自加拿大野生动物保护署的其他两位科学家最近完成了一个调查，这个调查所使用的野外数据跨度达到33年。

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