Results 11 to 20 of about 515,628 (150)

内蒙古赤峰地区环境因子对东北马鹿粪便皮质醇的影响

open access: yes野生动物学报, 2023
野生动物应激水平的非损伤性评估是了解野生动物对景观条件产生生理反应的重要方法。粪便皮质醇代谢产物(faecal cortisol metabolites,FCM)水平被认为是评价动物压力的潜在生物标志物。影响濒危东北马鹿(Cervus elaphus xanthopygus)应激的环境因子可能包括道路、植被、人为干扰和海拔等,因此采用酶联免疫分析法(ELISA)分析内蒙古高格斯台罕乌拉国家级自然保护区东北马鹿种群的粪便皮质醇激素数据,利用多元线性回归模型构建东北马鹿粪便皮质醇激素与环境因子的线性关系 ...
孙悦, 李剑峰, 张明海
doaj   +2 more sources

张掖东大山的甘肃马鹿

open access: yes野生动物学报, 1994
张掖东大山的甘肃马鹿甘肃马鹿又叫青鹿,是我国主要的经济动物之一,属国家二级保护野生动物,多栖息于海拔3500至5000米的高山森林或森林草原地带,有时也在稀疏的灌木丛中活动。它分布在西北地区的新疆、青海、甘肃、宁夏境内。张掖市东大山自然保护区的马鹿又...
王世积
doaj   +2 more sources

衰老脑海马CA1区突触结构的可塑性变化 [PDF]

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 1992
用E-PTA负染色和锇酸(O3 O4)处理普通透射电镜方法结合形态计量和体视学分析年青(3个月)和老年(27个月)SD大鼠海马CA1区分子层突触结构,结果显示衰老时海马CA1区突触形态结构发生了一系列退行性和代偿性变化:单位体积的突触数量(Nv),突触连接带总面积(Sv)明显减少,突触前终末内突触囊泡、线粒体数亦明显减少。突触后膜致密物厚度变薄,而突触接触带的平均长度则代偿性增大。突触间隙宽度,突触前终末剖面积,突触后终末棘器数无明显改变 ...
doaj   +1 more source

Seasonal Spatial Population Density Distribution Dynamics of Lynx and Ungulate Prey in Cold‐Temperate Coniferous Forests 寒温带针叶林猞猁和有蹄类猎物种群密度空间分布的季节性动态研究

open access: yesIntegrative Conservation, Volume 5, Issue 2, Page 225-235, June 2026.
This study used camera trap data from 6 years between 2016 and 2021 and generalized linear mixed models to explore the factors that influence the spatial density distribution of lynx and its prey populations in warm and cold seasons in Inner Mongolia Hanma National Nature Reserve, China.
Wentao Zhang   +11 more
wiley   +1 more source

Threats to the World's Bears and Efforts to Conserve Them: Perspectives and Actions of IUCN Bear Specialist Group Members 世界熊类面临的威胁及其保护努力:IUCN熊类专家组成员的观点与行动

open access: yesIntegrative Conservation, Volume 5, Issue 2, Page 177-191, June 2026.
A survey of IUCN Bear Specialist Group (BSG) members revealed that habitat loss, degradation and fragmentation is the greatest threat to each of the 7 species of terrestrial bears. Poaching and human–bear conflicts are also high threats for some of these species.
David L. Garshelis   +3 more
wiley   +1 more source

Harnessing social media data to track species range shifts

open access: yesConservation Biology, Volume 40, Issue 3, June 2026.
Abstract Biodiversity monitoring programs and citizen science data remain heavily biased toward the Global North. Especially in megadiverse countries with limited biodiversity records, incorporating social media data can help address existing data gaps.
Shawan Chowdhury   +15 more
wiley   +1 more source

Use of species’ responses to cryptic anthropogenic disturbances for monitoring biodiversity outcomes in tropical forests

open access: yesConservation Biology, Volume 40, Issue 2, April 2026.
Abstract Measuring area‐based conservation outcomes in tropical forests is challenging due to cryptic human disturbances (e.g., hunting). As a result, comparative studies of management strategies providing quantitative outcomes remain scarce, especially in the Neotropics.
Lucy Perera‐Romero   +5 more
wiley   +1 more source

渤海海峡区域地壳稳定性评价 [PDF]

open access: yes, 2017
区域地壳稳定性评价在我国主要作为工程建设的决策和规划的重要参考。这一方法是在我国的大型工程的建设活动中得到了广泛地应用,其应用范围包括大坝、核电站的决策和选址以及城市规划、铁路、隧道等工程的建设等。近年来,随着工程活动规模的扩大,对区域地壳稳定性评价也提出了新的要求:一是需要更加贴近工程实践,实现由场地评价向地质工程设计的转变;二是需要将评价区域由传统的陆地区域扩展到海域。本文即是一次进行海域工程区域地壳稳定性评价的尝试,利用所采集到的渤海海峡及邻区最新的GPS 数据、重磁场数据 ...
刘忠亚 赵铁虎 彭轩明, 赵铁虎
core  

Sun Bear Ecology and Conservation: Multiscale Habitat Associations in Southeast Asia 马来熊的生态与保护:东南亚地区的多尺度生境关联研究

open access: yesIntegrative Conservation, Volume 5, Issue 1, Page 125-136, March 2026.
We collated detections of the sun bear from new and previously published camera trap studies across its range. We then analysed these detections at two different spatial scales to assess the habitat associations and diel activity of this species. We found that the sun bear is tolerant to moderate habitat disturbances. ABSTRACT Degraded tropical forests,
Alexander Hendry   +5 more
wiley   +1 more source

海马CA3区突触结构在记忆中的变化

open access: yes, 2005
目的 探讨突触结构的可塑性变化与记忆保持的关系。方法 昆明品系1月龄小白鼠60只,进行一次性被动回避反应学习,在记忆形成前与后的不同时期取脑海马CA3区,用电子透镜检测其突触结构的变化。结果 在学习后24h、记忆保持良好(步入潜伏期>300s)时,穿孔突触由学习前占突触总数的6.3%增加到40.8%(P 320nm)由学习前占6.2%增至30.8 ...
许世彤, 何胜昔, 区英琦, 肖鹏
core   +1 more source

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