Results 31 to 40 of about 115,779 (161)
白鹤(Grus leucogeranus)为国家Ⅰ级重点保护动物及IUCN极危(CR)物种,野外种群数量4 000只左右。江西鄱阳湖是全球白鹤最主要的越冬地,几乎全球整个白鹤种群(超过99%)在该区域越冬。学者研究显示:气候、水位、生境类型、人为干扰等因素会对白鹤停歇地及越冬地的种群数量、活动节律、食性等产生影响。白鹤春秋迁徙期会以不同的策略,沿着相似的路线迁徙,具有一定的专一性。白鹤以植物性食物为主,对栖息地有选择偏好。近年来,人工生境成为白鹤重要的觅食越冬地。本文在总结前人的研究基础上 ...
刘 鹏 1 孙志勇 1 刘美娟 2 韩卫杰 1 刘 俊 1 冯莹莹 1 张壹萱 1 雷小勇 3 宋 琼 4 黄晓凤 1
doaj +1 more source
鄱阳湖湿地豆雁(Anser fabalis)越冬种群的春季迁徙路线及其活动特征
了解迁徙路线和迁徙前后活动规律对候鸟的保护具有重要意义.2019年2-3月,在鄱阳湖对20只豆雁(Anser fabalis)佩戴了卫星跟踪器,研究了鄱阳湖豆雁越冬种群的迁徙路线和活动特征.结果表明,最早的个体在3月12日开始北迁,较晚的个体4月25日北迁,截至6月20日仍有部分个体没有迁徙.豆雁卫星追踪时间为60.5±15.6天(n=19),迁徙距离为1349.5±1004.9 km(n=18),迁徙时间为34.7±16.1天(n=18),停歇地的数量为6±3(n=18 ...
曹开强 +11 more
semanticscholar +1 more source
哈萨克斯坦PKOP奇姆肯特炼油厂,位于古丝绸之路交汇点的南哈州首府奇姆肯特市,由于工艺落后逐渐不适合发展需要,在中哈两国政府的支持和石油公司的努力下,决定对其进行升级改造。加热炉衬里完成后需要越冬,而哈萨克1月份平均气温为-29℃至-4℃,由于气温较低,加热炉衬里在严寒气候下易遭到破坏,即需要对装置中加热炉衬里进行烘干处理。烘干采用热风法热处理方式,使用自制小型热处理设备,对加热炉及烟囱整体、同时进行烘干。文章从衬里烘干完成后,经过越冬后检查,烘干效果良好,为国外同类加热炉衬里烘干提供借鉴。
栋 王 +4 more
semanticscholar +1 more source
人为干扰对越冬后期稻田中小天鹅( Cygnus columbianus )昼间能量消耗的影响
能量的消耗模式是动物适合度的重要体现,动物的日常行为和栖息地特征共同影响日能量消耗.稻田生境是越冬水鸟重要的觅食场所之一,同时又容易受到人为干扰,越冬水鸟应对日间不同的人为干扰因素而合理进行能量消耗配置,对于在越冬后期为迁徙而贮备能量的水鸟来说尤为迫切和重要.本文采用焦点动物取样法,观测越冬后期稻田中小天鹅( Cygnus columbianus )在干扰和非干扰环境中昼间行为的时间分配,推算其能量消耗.结果表明,小天鹅在干扰环境中警戒行为的时间分配和能量消耗、单次警戒时间和警戒频次均显著大于非干扰环境,
于超 +5 more
semanticscholar +1 more source
安徽升金湖越冬白头鹤(Grus monacha)肠道菌群组成的时间变化
肠道微生物对于维持动物消化道内环境的稳定具有重要意义,而肠道微生物菌群结构也受寄主食物成份等外界环境因素的影响.研究动物肠道微生物菌群结构可以更好地了解动物生活状况.以升金湖越冬白头鹤的粪便作为研究对象,以微生物16S rRNA的V3~V4区作为标记基因,进行高通量测序,分析升金湖越冬不同时期白头鹤肠道菌群结构的差异性.研究结果表明:升金湖越冬期不同时期白头鹤粪便样品中微生物多样性指数如香农威纳多样性指数和辛普森指数无显著性差异.但是越冬期不同阶段的粪便样品中菌群组成存在差异,主要包括:在门分类水平 ...
赵广红 +7 more
semanticscholar +1 more source
Tracking with GPS and accelerometers shows that great evening bats in subtropical China use two overwintering strategies: some remain in continuous hibernation, while others switch between torpor and activity as temperatures change. This behavioral flexibility, shaped by climate, underscores the importance of protecting diverse roosting habitats for ...
Zhiqiang Wang +7 more
wiley +1 more source
Generation cycles in experimental populations of a multivoltine insect
Although theory suggests various mechanisms by which environmental and ecological factors may drive generational fluctuations, our field‐cage experiment is the first to demonstrate how internal dynamics and external disturbances jointly produce synchronised, large‐scale outbreak cycles.
Takehiko Yamanaka +3 more
wiley +1 more source
Overreliance on Orthographic Similarity in L2‐Japanese Conceptual Processing by L1‐Chinese Learners
ABSTRACT Orthographic and phonological similarities between first (L1) and second (L2) languages can facilitate L2 processing. Particularly, L1‐Chinese learners of L2‐Japanese can benefit from the shared morphosyllabic Chinese characters (Japanese kanji/Chinese hanzi) because of their similar orthographies.
Xuehan Zhao, Kexin Xiong, Sachiko Kiyama
wiley +1 more source
Clip Voice: Misogyny and the Renegotiation of a Gendered Vocal Style in Chinese Digital Discourse
ABSTRACT The participatory culture of social media allows women's voices to be heard but also parodied and policed. On Chinese social media platforms, where performers rapidly adopt and transform vocal trends for engagement, discourse on gendered vocal styles has proliferated.
Zichuan Yu, Rebecca Lurie Starr
wiley +1 more source
Our study addresses the significant knowledge gap regarding the wintering population and habitat utilization of the Yellow‐breasted Bunting (Emberiza aureola) in Nepal, providing crucial insights that can aid in the conservation of this critically endangered species in wintering grounds.
Hem Bahadur Katuwal +6 more
wiley +1 more source

