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【简答题】
风景优美的大洲岛国家级自然保护区是金丝燕的栖息地。“东方珍品”大洲燕窝就产于此。金丝燕体表覆羽,前肢变成翼,有气囊辅助肺呼吸。调查发现,由于 过度采集燕窝,金丝燕已处于极度濒危状态。请据资料回答问题: (1)从生态系统的类型看,大洲岛周围的海域属于____生态系统。 (2)根据金丝燕的结构特征,它在分类上属于脊椎动物中的____类。 (3)大洲岛海域生长着丰富的藻类资源,浅水处长绿藻,稍深处长褐藻,再深处长红藻,影响藻类的这种分布的主要因素是____。 (4)退潮后,露出栖息在礁石上的各种动物,它们与环境融为一体,不易被发现,这说明生物能够____环境。 (5)金丝燕的灭绝直接影响生物____的多样性和 的多样性。
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