Results 11 to 20 of about 920 (119)

大西洋中北部双频微地动特征

open access: yesDizhen xuebao, 2021
本文对大西洋中北部两侧五个地震台站2015年记录到的地震数据进行处理,计算噪声功率谱密度和概率密度函数,并通过极化分析对双频微地动不同周期的主导源区方位角分布进行了分析。研究结果显示:大西洋中北部台站双频微地动发生显著分裂,各台站的峰值周期各不同,且来自相同方向和不同方向的双频微地动都有可能产生双频微地动分裂;大西洋中北部的噪声功率谱密度随季节变化复杂,部分台站冬季的功率谱密度振幅比夏季强,部分台站夏季的比冬季强;而大西洋中北部台站源区方位受季节影响不大,台站主要源区的方位不变 ...
Yizhi Fang, Mei Xue
doaj   +1 more source

The fine‐scale movement pattern of Amur tiger (Panthera tigris altaica) responds to winter habitat permeability 小尺度下东北虎 (Panthera Tigris altaica) 的运动模式对冬季栖息地渗透性的响应

open access: yesWildlife Letters, Volume 1, Issue 3, Page 119-130, September 2023., 2023
We collected Amur tiger track data and occurrence data through snow track tracking, sample line surveys, and camera traps. The study concluded that forest roads, scrub vegetation, and human landscape factors were the main factors influencing Amur tiger movements at fine scales and examined the negative correlation between tiger path curvature values ...
Ying Wang   +9 more
wiley   +1 more source

Survey optimization for invasive Burmese pythons informed by camera traps 基于自动相机监测技术的入侵物种缅甸蟒的调查优化

open access: yesWildlife Letters, Volume 1, Issue 3, Page 143-148, September 2023., 2023
We evaluated the utility of camera traps to survey invasive Burmese pythons in the Florida Keys by deploying cameras pointed towards target areas of known radiotagged snakes under two trigger mechanisms—motion‐triggered or timelapse. We estimated detection probability and diel activity to optimize future surveys using timelapse camera traps and paired ...
Michael V. Cove   +4 more
wiley   +1 more source

Trends and progress in studying butterfly migration 蝴蝶迁徙行为的研究趋势与进展

open access: yesIntegrative Conservation, Volume 1, Issue 1, Page 8-24, December 2022., 2022
We show (i) the potential importance of non‐English‐language literature for understanding butterfly migration globally, (ii) studies are mostly concentrated in North America and Europe with very few from the tropics, (iii) most studies are focused on three species: the Monarch (Danaus plexippus), Painted Lady (Vanessa cardui) and Red Admiral (Vanessa ...
Shawan Chowdhury   +10 more
wiley   +1 more source

Unravelling the processes between phenotypic plasticity and population dynamics in migratory birds

open access: yesJournal of Animal Ecology, Volume 91, Issue 5, Page 983-995, May 2022., 2022
This work highlights the critical role of the stopover stage of northward migration in the influence of migration tactics and population dynamics of migratory birds across the whole annual cycle. The authors also demonstrate the key processes linking individual migration tactics and population dynamics.
Jin Liu   +5 more
wiley   +1 more source

昭通绒鼠夏冬季节体重和产热特征的变化

open access: yes野生动物学报, 2021
为探究昭通绒鼠(Eothenomys olitor)体重和产热特征的季节性变化,对其夏季和冬季的体重、体脂重量、摄食量、静止代谢率(RMR)、非颤抖性产热(NST)、血清瘦素质量浓度、内脏器官和消化道重量、肝脏和褐色脂肪组织(BAT)中的生化指标以及下丘脑神经肽Y(NPY)、刺鼠相关蛋白(AgRP)、阿片促黑色素原(POMC)和可卡因-安他非明转录调节肽(CART)基因表达量进行测定。结果显示:昭通绒鼠夏冬两季体重差异不显著,但体脂重量夏季较高,冬季较低;摄食量、RMR和NST均是冬季高于夏季 ...
杨押佐 1 贾婷 2 张浩 1 王政昆 1 朱万龙 1
doaj  

冬季和夏季达乌尔黄鼠下丘脑c-Fos、nNOS和NPY表达及血清激素水平比较

open access: yes野生动物学报, 2023
动物通过中枢和外周信号的相互作用调节食欲,达乌尔黄鼠(Spermophilus dauricus)是一种典型的贮脂类冬眠动物。为探究动物冬眠期调节食欲的神经内分泌反应摘 要:与夏季活动期相比有何不同,通过免疫组织化学方法比较冬季和夏季达乌尔黄鼠下丘脑c-Fos、神经元型一氧化氮合酶(nNOS)以及神经肽Y(NPY)表达,同时用酶联免疫方法检测血清中调节食欲的胃饥饿素(GHRL)和促肾上腺激素释放激素(CRH)浓度。结果发现:冬季达乌尔黄鼠下丘脑弓状核(ARC)、室旁核(PVN)、腹内侧核(VMH ...
郑杨慧, 王恒, 马小梅, 王建礼
doaj  

冬春季狍取食营养策略及影响因素研究

open access: yes野生动物学报, 2023
为了对比分析冬季和春季狍(Capreolus pygargus)取食营养策略及其影响因素,2020年11月—2021年5月,在吉林珲春东北虎国家级自然保护区进行野外调查和样本采集等工作,共收集狍粪便38份,其中冬季26份,春季12份;植物样本953份,其中冬季542份,春季411份。通过分析狍食性,测定可食植物宏营养和微营养含量,以及定量环境中食物获得性和可食植物的营养含量,对比分析冬春季狍的食物组成和营养策略。结果表明:冬春季狍食物组成和食物可获得性存在差异 ...
齐琦, 包衡, 姜广顺
doaj  

A study on the interaction between ground-air temperature differences over the Qinghai-Tibet Plateau and sea surface-air temperature differences over the Indian Ocean(青藏高原地气温差与印度洋海气温差的相互影响)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2018
青藏高原和印度洋均对我国气候有重要影响,研究高原和印度洋的热力状况及其耦合关系对全面了解我国的天气现象具有重要意义.利用1981 — 2010年(30 a)欧洲中心ERA-interim的青藏高原和印度洋温度资料,以及NCEP/NCAR的垂直速度和风速资料,分析了青藏高原地气温差和印度洋海气温差的特征及其相互影响.结果表明,高原冬、夏季地气温差有所区别:冬季地气温差呈东北-西南向的带状分布,在高原中部、西南边界喜马拉雅山脉地区和东南边界出现了较大的负值中心,其他地区均为正值;夏季地气温差均为正值 ...
SHENZiwei(申紫薇)   +2 more
doaj   +1 more source

基于高通量测序技术对不同季节圈养褐马鸡肠道菌群多样性分析

open access: yes野生动物学报, 2022
为提高褐马鸡(Crossoptilon mantchuricum)疾病防控能力和饲养管理水平,利用高通量测序技术对其肠道菌群进行多样性分析,探知其肠道菌群在不同季节的变化规律,并预测潜在致病的高发时间段,结果表明:门水平上,圈养褐马鸡的肠道优势菌群为厚壁菌门(Firmicutes,52.11%)、拟杆菌门(Bacteroidetes,18.20%)、变形菌门(Proteobacteria,17.91%)和放线菌门(Actinobacteria,7.32%); 属水平上 ...
雷 英   +11 more
doaj  

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