极地生态系统对比

比较北极和南极的生态系统——北极拥有陆地（苔原）和海洋生态系统，支撑着大型陆地哺乳动物和原住民社区；而南极几乎完全以海洋为基础，几乎没有陆地植物或哺乳动物。两个地区的食物链都短而密集，以浮游植物和磷虾为基础，并且都受到气候变化和人类活动的严重影响。

Compare Arctic and Antarctic ecosystems — the Arctic has both terrestrial (tundra) and marine ecosystems supporting large land mammals and indigenous human communities, while the Antarctic is almost entirely marine-based with virtually no land plants or mammals; both regions have short, intense food chains anchored by phytoplankton and krill, and both are disproportionately affected by climate change and human activity

学习证据 / Evidence

• 比较北极（陆地+海洋，陆地哺乳动物，人类社区）与南极（几乎完全海洋，没有陆地哺乳动物）
• 解释两个极地食物链都以浮游植物和磷虾为基础
• 描述为什么极地生态系统特别容易受到气候变化的影响（食物链短，特化生物）

• Compare Arctic (terrestrial + marine, land mammals, human communities) with Antarctic (almost entirely marine, no land mammals)
• Explain that both polar food chains depend on phytoplankton and krill at the base
• Describe why polar ecosystems are particularly vulnerable to climate change (short food chains, specialised organisms)

评估问题 / Assessment

{{name}}能比较北极和南极的生态系统吗——解释北极有陆地动物和人类，而南极的生命几乎都在海里，并且两者都依赖像磷虾这样的微小生物？

Can {{name}} compare the Arctic and Antarctic ecosystems — explaining that the Arctic has land animals and people while Antarctica's life is almost all in the sea, and that both depend on tiny creatures like krill?