论文部分内容阅读
研究目的和意义鸳鸯是国家二级保护动物,其主要繁殖地在我国东北及华北北部,并延伸到俄罗斯东部、日本、朝鲜等地。鸳鸯一般在长江流域以南的福建、台湾、广东、云南、贵州等地,以及缅甸和印度东北部越冬。鸳鸯是杂食性动物,动物性食物以昆虫和小鱼虾为主,植物性食物以各种水生植物为主。鸳鸯的繁殖期一般在4—5月,巢通常选在近水的老龄高大乔木的树洞中。北京的城市公园
Research purposes and significance Mandarin duck is a national secondary animal, its main breeding ground in northeast China and northern North China, and extends to eastern Russia, Japan, North Korea and other places. The mandarin ducks are generally located in the provinces of Fujian, Taiwan, Guangdong, Yunnan and Guizhou to the south of the Yangtze River valley, and wintering in Myanmar and northeastern India. Mandarin duck is omnivorous animal, animal food mainly insects and small fish, plant food mainly aquatic plants. Mandarin duck breeding season is generally 4-5 months, the nest is usually selected in the water near the trees in the tall trees. Beijing's city park