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北京城区有多少只鸳鸯?城区三处鸳鸯最多
2019-03-20 19:09:07 酷酷小编

  北京城区有多少只鸳鸯?

  目前调查发现城区内农展馆后湖、动物园和玉渊潭三处鸳鸯最多

  上午,北京又飘起雪花,在玉渊潭樱花苑的一片水面上,几只鸳鸯仍出来溜达觅食。专家说,这点小雪对鸳鸯来说没问题,3月鸳鸯就该求偶了,之后就忙着寻找繁殖巢穴。为了更好地了解北京城区鸳鸯的分布情况,还有一群人也正忙活着。

  记者了解到,2019年北京城区鸳鸯科学调查正在进行中,调查团队由北京市野生动物救护?#34892;?#19987;家和社会志愿者组成。此次调查的内容主要是了解北京城区鸳鸯种群的数量和分布,区分其繁殖种群和越冬种群,为进一步研究它们的繁殖动态和迁徙规律做准备。

  鸳鸯安家喜欢选哪儿?

  北京市野生动物救护?#34892;?#21490;洋是调查团的领?#27185;?#20182;告诉记者,以前北京城区只有春秋迁徙季节和夏季繁殖季节能见到鸳鸯,但现在冬季也能见到(鸳鸯),到底春夏秋冬我们见到的鸳鸯是几个种群,是否有重合,都需要进一步了解。另一方面,北京城区近年来鸳鸯遇见率显著提高,但是城区适合它们栖息的大树树洞却不多。与其他水鸟不同,鸳鸯最喜欢的休憩地和筑巢地是水边的树洞,“由于景观调整和安全?#20173;?#22240;,一些有树洞的大树被砍伐或者修枝而导致繁殖条件不足,现在不清楚这对鸳鸯的种群数量有何影响,或者鸳鸯是否有了其他的选择”,史洋觉得此次调查说?#27426;?#33021;解开心头疑惑。

  鸳鸯查户口限在五环内

  史洋告诉记者,鸳鸯在我国大部分地区被看作迁徙候鸟,春夏到北方繁殖,冬季迁往南方越冬。雄鸟羽毛色彩艳丽,背部有橘红色的帆状飞羽;雌鸟通体颜色为暗哑的?#30097;?#26377;白色贯眼纹和?#30097;?#30340;喙。现在北京地区的鸳鸯既有留鸟也有候鸟,野生鸳鸯每年2月底3月初迁来北京,此后繁殖育雏,10月底11月初离开北京。北京地区上次进行鸳鸯调查还是由北京观鸟会在十年前做的,为期三年,覆盖城区和郊区,统计鸳鸯数量1519只。在那次调查中有很多有趣的发现,如水质越好,鸳鸯的数量就会越多;野生鸳鸯与人的距离小于20米就迅速飞离等。史洋介绍,这次的调查范围主要是在五环内,初步计划分几个阶段来进行,已经完成的冬季调查主要内容是城区鸳鸯的越冬种群数量,即将进行的春季调查侧重鸳鸯繁?#22478;?#31181;群数量和繁殖点分布及数量,夏季调查则主要观察鸳鸯繁殖后种群数量和繁殖率。

  城区三处鸳鸯最多

  在已经完成的冬季调查中,参与的志愿者有80多位,“一纸鸳鸯调查令”将大家聚在一起。志愿者们在玉渊潭、北海公园、北京动物园、农展馆后湖、颐和园团城湖等城区9个鸳鸯主要栖息地进行了调查。为了防止鸳鸯在临近公园飞来飞去出现重复计数,调查采取的是同步调查的方?#20581;?#32463;过调查,志愿者们在这些栖息地共发现547只鸳鸯,其中雌鸟221只,雄鸟326只,城区鸳鸯数量最多的前三处地方分别是农展馆后湖、北京动物园和玉渊潭。

  据悉,北京城区鸳鸯春季调查将于3月中下旬进行,3月初调查团就会在北京市野生动物救护?#34892;?#21516;名官方微信公众号上进行志愿者?#24515;跡?#24863;兴趣的市民可以关注。

  本报记者 孙文文 张永摄

澳门拉斯维加斯网站-澳门拉斯维加斯官网-拉斯维加斯线上网站
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