首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5篇
  国内免费   1篇
  完全免费   6篇
  2018年   2篇
  2017年   1篇
  2015年   1篇
  2011年   2篇
  2009年   1篇
  2007年   1篇
  2004年   1篇
  1999年   1篇
  1991年   2篇
排序方式: 共有12条查询结果,搜索用时 141 毫秒
1.
丹顶鹤与白枕鹤的领域比较   总被引:10,自引:2,他引:8  
有7种濒危鹤类受到现代人的威胁[20],丹顶鹤(Grusjaponensis)和白枕鹤(Grusvipio)是其中两种,分别为我国的Ⅰ、Ⅱ级保护动物。在中国丹顶鹤主要在黑龙江省的乌裕尔河下游和三江平原等地繁殖,数量在482~502之间[7]。吉林省的向海也有40余只繁殖鹤[8,9]。它们在长江中下游的江苏盐城、高邮湖、洪泽湖,安徽省的城东湖、石臼湖、菜子湖越冬[5]。白枕鹤繁殖区在中国东北的乌裕尔河下游、向海、达里诺尔湖以及乌苏里江以东俄罗斯的沿海边区[20]。我国已知的繁殖区内数量不多[1],…  相似文献
2.
扎龙湿地白枕鹤孵化期觅食生境选择   总被引:5,自引:0,他引:5       下载免费PDF全文
2002—2008年4—5月,采用定点观察、GPS定位、样方调查和因子分析等方法,研究了扎龙湿地白枕鹤孵化期对觅食生境的选择.结果表明:在孵化期,研究区白枕鹤的觅食生境类型主要为芦苇沼泽(74.36%),觅食生境的选择以标识因素和能量因素为主,其次是可觅性因素、安全距离因素和隐蔽因素;扎龙湿地白枕鹤孵化期的觅食生境类型多样化,以湿地(芦苇沼泽)为主,兼含陆地(农田);白枕鹤孵化期的觅食生境包括生境标识、食物、水和隐蔽物四大要素,其对觅食生境的选择分2个层次(大生境层次和小生境层次)3个过程(觅食生境类型选择、觅食区选择、觅食微生境选择).  相似文献
3.
对白枕鹤领域的初步研究   总被引:3,自引:0,他引:3       下载免费PDF全文
1986-1988年的3-5月间,在黑龙江省林甸县对白枕鹤的领域进行了研究。三年中,对8个巢的领域研究结果表明,白枕鹤多年连续利用同一领域,占据的最大领域面积为10.7平方公里,平均不超过7.0平方公里,并随繁殖过程而缩小,至雏期活动和防御范围只有1.5平方公里左右。多数白枕鹤的领域内包括一片耕地为固定觅食区,但小于无耕地的领域面积。  相似文献
4.
白枕鹤的呼吸系统及其生态适应   总被引:2,自引:0,他引:2       下载免费PDF全文
白枕鹤的呼吸系统由喉头、气管、鸣管、肺及气囊组成。喉头有淋巴小结分布。气管在龙骨突起内盘旋,并随年龄而增长,软骨环逐渐骨化。鸣管由左右两个支气管特化而成,呈膜状扁管入肺。肺的长度约占躯干的1/2。气囊几遍布全身,高度发达。整个呼吸系统的结构,与其高空飞翔生活相适应。  相似文献
5.
为了探讨白枕鹤Grusvipio的巢址选择特征,2007~2009年的4~5月,在黑龙江省扎龙自然保护区采用定点观察法、样方调查法、因子调查法和因子分析及显著性检验等,对白枕鹤的营巢生境类型和营巢生境特征进行了调查。结果表明,白枕鹤对营巢生境类型的要求比较单一,仅选择芦苇沼泽;巢址生境特征具有明显的偏好,即(1)距干扰区的距离多在1.5km以上(86.36%),(2)巢周的水深多小于16cm(95.45%),(3)巢周明水面面积多小于200m2(90.90%),(4)巢距火烧地的距离以1.0~2.5km居多(63.64%),(5)剩余苇丛面积多小于200m2(86.37%)、距剩余苇丛距离多大于30m(81.82%)、剩余苇丛密度多小于500株/m2(77.27%)、剩余苇丛高度以大于1.5m的居多(72.73%)。进一步分析表明,白枕鹤对营巢生境特征的要求具有普遍性和特殊性,表现出一定的适应能力,火烧地、剩余苇丛、干扰区和水是其营巢的主要环境特征。  相似文献
6.
We determined how the presence of heterospecific individuals in the vicinity of a focal individual affects the behavior of two critically endangered species of cranes on their wintering grounds at Cheolwon in the Korean Demilitarized Zone. The red-crowned crane, Grus japonensis, is larger than the white-naped crane, Grus vipio, and it dominates the white-naped crane in aggressive interactions. We showed that the dominant species increases foraging activity in the presence of the subordinate species presumably because of scrounging of food from the subordinate. Because interspecific interactions may affect avian endangerments these behavioral findings should be taken into account when managing winter refuges for the two endangered crane species.  相似文献
7.
Numerous studies have addressed antipredatory benefits of mixed-species flocks of foragers, but studies on individual's vigilance as a function of group size are limited. In the Cheolwon area of the Korean Demilitarized Zone, vigilance of the subordinate White-naped cranes (Grus vipio) in 11 groups composed of conspecifics and the dominant Red-crowned cranes (Grus japonensis) was examined. Vigilance correlated negatively with group size due to negative correlation with the number of conspecifics, but not the dominant heterospecifics. This is consistent with the hypothesis that a decrease in vigilance in larger groups is due to antipredatory benefits from increased predator detection in larger groups (associated with the presence of a larger number of conspecifics). This suggested that the mechanism leads to canceling out of the otherwise expected antipredatory benefits to the subordinate species from the increased predator detection by larger group size (associated with larger number of dominants). This is one of only a few behavioral studies of these endangered crane species in the relatively inaccessible wintering area of international importance in the areas of high conservation value.  相似文献
8.
2014年11月至2015年3月,以及2015年11月至2016年3月,利用卫星跟踪技术对6只越冬于鄱阳湖的白枕鹤(Grus vipio)活动区面积进行了研究,利用广义线性混合模型(GLMM)分析了水位、气温、年份、年龄及个体差异对活动区面积的影响,利用Pearson相关分析将对活动区面积影响较大的因子与活动区面积进行了相关性分析。结果发现,两个越冬期内白枕鹤平均周活动区面积,2014至2015越冬期为(57.85±94.67)km~2,2015至2016越冬期为(12.01±17.74)km~2。在两个越冬期内,活动区面积均呈显著下降趋势(2014~2015年,t=﹣2.831,P0.01;2015~2016年,t=﹣3.422,P0.01);气温对活动区面积的影响不显著(P0.05),而水位对活动区面积具有极显著影响(P0.01);2014~2015年水位高度(14.92±0.65)m,2015~2016年水位高度(15.39±0.70)m,周活动区面积与同期水位高度显著正相关(2014~2015年,r=0.370,P0.01;2015~2016年,r=0.380,P0.01)。推测水位的变化影响越冬白枕鹤主要食物的生长及可获得性,进而导致越冬期白枕鹤活动区面积的相应变化。  相似文献
9.
2014年7月,在内蒙古锡林郭勒盟苏尼特左旗记录到4个带幼鸟的白枕鹤家庭和1对未带幼鸟的成鸟。经查阅文献,发现本次调查将白枕鹤的繁殖分布区向南推进了约1个纬度。  相似文献
10.
In Japan, the three main crane species are the endangered red-crowned crane (Grus japonensis) inhabiting Hokkaido, the northernmost island of Japan; the vulnerable hooded crane (Grus monacha); and the vulnerable white-naped crane (Grus vipio). Both the hooded and white-naped cranes migrate in winter to Izumi in Kyushu, the southern island of Japan. In this study, we investigated the cranes and their coccidian parasites, through a targeted molecular approach using faecal DNA to develop a noninvasive method for infectious disease research. To determine the origin of noninvasively collected faecal samples, host species were identified by sequencing a region of approximately 470 bp of the mitochondrial 16S ribosomal RNA gene in the faecal DNA. Furthermore, to avoid sample redundancy, individual determination was performed by fragment analysis using microsatellite and sex-linked markers. For microsatellite genotyping, previously reported markers and markers isolated in this study were examined, and seven loci for red-crowned cranes, eight for hooded cranes and six for white-naped cranes displayed polymorphisms. A low error rate was demonstrated by comparing microsatellite data generated from faecal DNA samples with that generated from feather DNA samples, indicating a high reliability. Polymerase chain reaction-based capillary electrophoresis (PCR-CE), employing genetic markers in the second internal transcribed spacer (ITS2) of nuclear ribosomal DNA, was employed to detect crane coccidia. The sensitivity of detection of PCR-CE using faecal DNA was inferior to that with traditional microscopy; however, our results suggest that PCR-CE can depict crane coccidia diversity with higher resolution and it is a useful tool to characterize community composition of coccidia in detail.  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号