Results 31 to 40 of about 1,838,862 (165)
Only 1541 (34.2%) of 4503 recognized non‐passerine bird species are held in ZIMS institutions worldwide. Approximately ~83% of the species kept globally are classified as non‐threatened and ~16% as threatened. To improve the conservation of threatened birds, a shift toward keeping threatened species should be considered within ex situ management ...
Anna Wahle +6 more
wiley +1 more source
环境温度对东北林蛙(Rana dybowskii)体温的影响
在10℃、16℃、22℃和28℃4个温度条件下,通过测量东北林蛙泄殖腔温度的方法,研究分析了东北林蛙2个不同种群在不同环境温度下的体温变化及其影响。结果表明,东北林蛙的体温随着环境温度的升高而升高,两性间体温无显著差异,但不同地理种群间体温存在一定的差异; 恒温条件下,集安种群的体温没有明显日变化节律,而伊春种群的体温存在显著的日节律变化; 伊春种群具有较低的体温和较强的体温调节能力。由此可知,环境温度是影响东北林蛙不同地理种群的体温及生理体温调节能力的主要因素之一。
孙清琳 徐骁骁 刘 鹏 赵文阁
doaj
Accurate species identification is critical for conserving endangered Firmiana trees in China. However, morphological similarities among closely related Firmiana species complicate its taxonomic identification. We conducted genome skimming on 62 samples representing all 10 Chinese species and discovered nrITS as the optimal DNA barcode, achieving 100 ...
Li‐Jun Yan +8 more
wiley +1 more source
We demonstrated that Anguilla japonica eDNA concentration was allometrically scaled with their body size in both the laboratory and riverine environments. Integrating body size allometry has the potential to improve population abundance estimates in the field, whereas further clarification is required for understanding eDNA production mechanisms ...
Toshiaki S. Jo +2 more
wiley +1 more source
ABSTRACT This article aims to sort out the meaning of the term “health nationalism,” operationalize this term and analyze this phenomenon in opposition to the cosmopolitan health policy model. Here, health nationalism is treated as a serious obstacle to access to healthcare and a cultural‐ideological barrier to equity in global public health. Two ideal
Piotr Żuk, Paweł Żuk
wiley +1 more source
调查分析了四川省冶勒自然保护区内垂枝香柏的年龄结构.编制了静态生命表;绘制了存活曲线、死亡率曲线和消失率曲线;并探讨了垂枝香柏的更新.结果表明:①该树种平均年龄较大,约为277年.②存活曲线处于Deevey-Ⅱ型和Deevey-Ⅲ型之间,死亡率与消失率变化趋势一致.种群生存率呈单调下降趋势,生存率下降趋势前期相对稳定,中期逐渐增大,后期又趋向于稳定,说明垂枝香柏种群相对稳定,并有一定的更新能力.③保护区内垂枝香柏整个生长期中,200年以前,死亡率变化相对平缓,200年以后,死亡率急剧上升 ...
李松茂 +6 more
doaj
长江江豚是一个独立的种群,由于人类活动的影响,其数量呈下降的趋势。运用漩涡模型( V O R T E X 73)分析了长江江豚的种群生存力,预测了未来 100a 长江江豚的种群动态,比较了在假设环境条件下以及采取和不采取保护措施长江江豚种群的濒危程度,并模拟了江豚饲养群体的动态。主要结果显示,长江江豚在未来 100a 内灭绝的概率为 001,平均灭绝时间为 100a。如长江环境状况进一步恶化,长江江豚的灭绝概率将大幅度提高、灭绝时间也将随之提前至 24~94a ...
张先锋,王克雄
core
Evaluating protected areas’ coverage of threats to terrestrial biodiversity
Abstract Protected areas (PAs) are vital for biodiversity conservation and have expanded globally. However, increasing pressures on biodiversity make it difficult to achieve conservation goals. Using threat probability maps based on the International Union for Conservation of Nature Red List and the World Database of Protected Areas, we analyzed the ...
Katherine Pulido‐Chadid +2 more
wiley +1 more source
2011年10月~2014年10月,为了了解花鼠种群与食物资源的关系,我们在凉水国家级自然保护区,采用样方法与标志重捕法对花鼠种群动态进行了研究,结果如下:2011年及2014年红松结实量呈爆发式增长,同期花鼠种群数量出现2个较高峰值; 花鼠在2012年平均胎仔数达到最低值(1.04±0.13)只,同年越冬期生存率最低,达到(0.11±0.04); 花鼠在2013年繁殖期后雌雄性比达到最高值1.17。数据分析表明,在研究期间,红松结实年际间波动明显。花鼠种群的波动基本与食物资源波动同步 ...
刘蓓蓓 王广鑫 许 林 聂佳旭 戎 可
doaj
2014—2016年春季,在贺兰山马麝活动比较频繁的12条沟段对马麝的生境选择进行研究。共记录马麝春季利用样方164个,对照样方77个。利用拟合优度卡方检验及Bonferroni不等式对非数值型生境因子进行分析,结果表明春季马麝偏爱选择位于阴坡的、以青海云杉为优势树种的针叶林带活动。Mann-whitey U检验表明麝春季对于13种数值型生境因子的选择存在显著差异,偏好选择海拔高度高、乔木密度大、乔木高度低、乔木距离近、灌木高度高、灌木距离远、水源距离远、裸岩距离远、隐蔽级高的生境类型。此外 ...
陈俊达 1 +5 more
doaj

