Results 31 to 40 of about 11,319 (223)

火干扰下扎龙保护区散养丹顶鹤孵化期行为时间分配

open access: yes野生动物学报, 2019
火烧是扎龙保护区一个主要的生境干扰类型。为了了解散养丹顶鹤针对火烧而形成的行为时间分配差异,本文采用定点观察法、焦点取样法对火烧区不同情景下散养丹顶鹤孵化期行为差异进行了比较分析。结果显示:(1)扎龙保护区,散养丹顶鹤孵化期的行为以孵化、觅食、警戒为主(92.48%);(2)火烧区的出现,散养丹顶鹤的孵化、觅食、警戒行为时间分配会略高,而理羽和翻卵行为时间分配会略低;这种变化与火烧区的距离呈一定相关性。但卡方检验显示出,火烧区的存在和火烧区距离不影响散养丹顶鹤繁殖行为时间分配。进一步分析表明:轻度火烧下,
吴可新 沙力瓦·拍依祖拉木 苏滢 李小琴 彭景萃 李亚骐 吴庆明
doaj  

同域分布的黑颈长尾雉和白鹇冬季期觅食节律与时间分化比较研究

open access: yes野生动物学报, 2021
为了探究同域分布的黑颈长尾雉(Syrmaticus humiae)和白鹇(Lophura nycthemera)冬季觅食时间分配及分化,2017年和2018年冬季在广西岑王老山国家级自然保护区布设了123台红外相机。结果:保护区内黑颈长尾雉和白鹇在冬季期觅食地存在重叠现象;在觅食时间分配上,黑颈长尾雉存在3个觅食高峰,分别在7:00—8:00、11:00—12:00和16:00—18:00,白鹇有2个觅食活动高峰,分别在10:00—11:00和14:00—15:00,白鹇的觅食高峰较黑颈长尾雉的往后推迟,
辛桂瑜 张廷瑞 陈金莲 严海连 刘玲 张嘉宏 李桂芬 贝永建
doaj  

Parent and child gender effects in the relationship between attachment and both internalizing and externalizing problems of children between 2 and 5 years old: A dyadic perspective

open access: yesInfant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 4, Page 424-444, July 2025.
Abstract Acknowledging that the parent–child attachment is a dyadic relationship, we investigated differences between pairs of parents and preschool children based on gender configurations in the association between attachment and problem behavior.
Magda Matetovici   +4 more
wiley   +1 more source

笼养东方白鹳越冬行为的研究

open access: yes野生动物学报, 2006
采用瞬时扫描法研究了东方白鹳(Cionia boyciana)越冬行为的活动节律和时间分配。结果表明:笼养东方白鹳在越冬期其活动有一定的节律性;越冬期的主要行为时间分配比例分别为静栖行为59.25%、避风行为11.17%、觅食行为6.41%、瞭望行为5.56%、理羽行为5.39%、游走行为5.14%;成年个体与幼雏在越冬行为时间分配上表现出了很大的差异;两性间越冬行为时间分配的差异不大;不同的温度、天气条件,对笼养东方白鹳越冬行为有影响。经观察发现:东方白鹳在高纬度北方地区越冬 ...
马雪峰   +4 more
doaj  

Effectiveness of protected areas in the Caucasus Mountains in preventing rangeland degradation

open access: yesConservation Biology, Volume 39, Issue 3, June 2025.
Abstract As land use intensifies globally, it increasingly exerts pressure on protected areas. Despite open, nonforested landscapes comprising up to 40% of protected areas globally, assessments have predominately focused on forests, overlooking the major pressures on rangelands from livestock overgrazing and land conversion.
Arash Ghoddousi   +12 more
wiley   +1 more source

The Study on Married Women's Time Allocation [PDF]

open access: yes, 2006
已婚女性的时间冲突日益引起社会学家和经济学家共同关注。本文明确将已婚女性作为研究对象,描述分析已婚女性时间配置的历史和现状,揭示已婚女性时间配置的影响因素。研究发现,已婚女性时间配置趋势表现为市场工作时间、闲暇时间总量的增加和家务时间总量的急剧减少,时间的支配能力不断强化,新古典经济学理论已不能完美解释已婚女性时间配置的现实。论文借鉴中西方理论和实证研究的成果,按照时间三分法的定义提出时间配置三个阶段,构建已婚女性时间配置影响因素的扩展型理论分析框架并提出相关假设。多元回归分析结果表明 ...
石红梅
core  

圈养丹顶鹤幼鸟的行为发育

open access: yes野生动物学报, 2013
为了研究圈养丹顶鹤幼鸟的行为发育规律,为今后的丹顶鹤保护以及再引入工程提供有价值的资料,2011年6~9月,采用目标动物取样法和瞬时扫描取样法,在扎龙自然保护区对6只笼养丹顶鹤幼鸟进行了研究。研究了圈养丹顶鹤幼鸟生长发育过程中的行为谱及其变化和日间行为规律的变化。结果表明,随着周龄的增加,幼鸟的休息行为时间分配随着周龄的变化明显减少,游走、取食、理羽和警戒行为的时间分配随着周龄的变化有所增加,而玩耍行为的时间分配先逐渐增大然后减少并稳定。最后,圈养丹顶鹤幼鸟的各行为时间分配分别为:游走14.83 ...
曹雨, 吴建平
doaj  

Automated multivolume placental reconstruction using three‐dimensional power Doppler ultrasound and infrared camera tracking

open access: yesUltrasound in Obstetrics &Gynecology, Volume 65, Issue 5, Page 624-632, May 2025.
ABSTRACT Objectives Placental insufficiency contributes to many obstetric pathologies, but there is no bedside clinical tool to evaluate placental perfusion. We have developed a method to acquire multiple three‐dimensional (3D) power Doppler (PD) ultrasound (US) volumes of placental vasculature, with infrared camera tracking of the precise spatial ...
A. Xue   +5 more
wiley   +1 more source

低干扰多PAN太赫兹无线个域网MAC协议

open access: yesGuangtongxin yanjiu, 2021
为解决现有多个域网(PAN)太赫兹无线个域网(WPAN)介质访问控制(MAC)协议中存在的在常规信道时间分配时段(N-CTAP)的网络间节点传输数据干扰问题,即在常规节点传输数据过程中,存在部分节点与其他网络节点互相在对方的通信范围之内,导致在传输数据时,很有可能受到干扰的问题,文章提出了一种低干扰多PAN太赫兹WPAN MAC协议(LIPAN)。通过将常规节点分类提出边缘节点类型概念,找出会产生干扰的常规节点;自适应常规节点类型报告机制,将常规节点的节点类型告知微微网协调器(PNC ...
任智, 苏新, 郭黎, 吴本源
doaj  

Hydraulic traits are coordinated but decoupled from carbon traits in herbaceous species

open access: yesFunctional Ecology, Volume 39, Issue 5, Page 1302-1317, May 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant hydraulic traits primarily define the water regulation strategy, thus enabling a better understanding of vegetation structure, function and dynamics under varying hydro‐environments.
Ruike Huang   +9 more
wiley   +1 more source

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