Results 21 to 30 of about 8,476 (172)
Differences in characteristics between naturalized threatened plants and other threatened plants
Conservation Biology, EarlyView.Abstract Many non‐native plant species introduced by humans have become naturalized. At the same time many species are threatened in their native range. However, the number of plant species threatened in their native range that are naturalized elsewhere remains unknown.
Weihan Zhao +10 more
wiley +1 more source
小扭口藓(Barbula indica)芽胞发育特征的实验研究 [PDF]
, 2005 在光照培养箱中人工对照培养小扭口藓(Barbulaindica(Hook. )Spreng)的芽胞,显微镜下观察并记录其发育成配子体的全过程。结果表明:小扭口藓芽胞在3 ~4d即可萌发; 10d左右开始分化出绿丝体、轴丝体及假根; 18d,轴丝体上的侧枝顶端细胞以分生缢割的方式产生单细胞或多细胞芽胞; 40d,轴丝体上开始出现配子体原始细胞;之后,配子体原始细胞发育成桑椹状的幼小配子体。还对芽胞形态发育、生理生态及配子体发生过程的特点进行了分析和讨论。，CN 23-1480/
赵建成,黄士良,李敏,张元明,王晓蕊,范庆书
core
Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, EarlyView.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
The studies of two marine microalgae on the growth, diapause induction and egg conservation of Acartia pacifica [PDF]
, 2016 本文以发育时长、变态存活率、产卵量、孵化率、成体头胸部长和体长为指标，研究了球等鞭金藻(Isochrysisgalbana)和海洋原甲藻(Prorocentrummicans)以不同浓度和配比对太平洋纺锤水蚤(Acartiapacifica)生长、发育和繁殖的影响，以期探索培养太平洋纺锤水蚤最适合的饵料配方。同时，我们通过改变温度和光周期的培养环境探索了诱导太平洋纺锤水蚤产滞育卵的条件，并尝试添加不同的冷藏保护剂以延长卵的冷藏保存时间。主要研究结果如下： 1、不同的饵料浓度对太平洋纺锤水蚤发育时间 ...
付聪
core
Effects of political identity activation and inaccurate metaperceptions on attitudes toward wolves
Conservation Biology, EarlyView.Abstract Polarization between groups can undermine durable conservation outcomes. Activating group identities (i.e., an individual's sense of self derived from membership in a group) can exacerbate differences, especially when people hold inaccurate perceptions of their peers and rivals.
Alexander L. Metcalf, Justin W. Angle
wiley +1 more source
野生动物学报, 2018 根据上海动物园斑嘴环企鹅(Spheniscus demersus)种群的谱系及相关数据,编制生命表,基于VERTEX10.2.5对该种群未来100年的动态进行模拟,进而为种群发展提出管理建议。结果显示在理想条件下,无近交、无灾害、无密度制约,种群呈持续增长状态,灭绝概率为0,种群数量将达到138只。而在实际情况下进行模拟,则不容乐观。种群衰退,100年后灭绝概率为95.8%,因此针对该种群现状有针对性地提出保护管理措施刻不容缓。
刘芳远 黄康宁 刘群秀 田秀华
doaj
Survival strategy of Calanus sinicus in the northwest of the South China Sea [PDF]
, 2015 中华哲水蚤（Calanussinicus）是我国近海生态系统的特征种之一，在我国浮游生物学和近海生态系统动力学研究中具有重要意义。本文基于2006~2007年在南海西北部进行的四个季节的航次调查，研究了中华哲水蚤的空间分布和季节变化，以广义可加模型为工具量化分析了影响中华哲水蚤丰度变化的重要环境因子，同时探讨了南海西北部中华哲水蚤的种群来源和生存策略问题。主要研究结果如下： （1）中华哲水蚤的丰度变化具有显著的季节差异。在北部湾调查区域，春季平均丰度为2.37±8.00ind/m3，占桡足类总丰度的6 ...
杨璐
core
Conservation Biology, EarlyView.Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
wiley +1 more source
野生动物学报, 1983 研究动物种群的动态,即种群数量及其变动规律,无论在生产实践上和生态学理论研究上,都具有重要的意义。褐马鸡（Crossoptilon mantchuricum）是世界珍稀雉类,被列为我国一类保护动物。掌握褐马鸡种群数量及其变化规律,反映出时间和空间的概念,求出现存量,这对保护和科学管理褐马鸡的资源尤为重要。褐马鸡以地面活动为主 ...
张俊, 刘焕金, 苏化龙, 冯敬义
doaj
Study on pollution ecology of microorganisms in polluted water in Shaxi Sanming river [PDF]
, 2005 摘要沙溪是闽江上游三大支流之一.近年来，随着三明市经济的发展，局部污染事件时有发生.微生物作为生态系统的三大组分之一，在有机质分解、营养物质循环和利用等方面起着重要的作用.由于微生物对环境胁迫的敏感性要比动物和植物高得多，因此它已成为评价环境变化的重要指标.本实验对沙溪三明河段的细菌、真菌、大肠菌群以及降解污染物的主要微生物种群进行了两年的数量跟踪，结合COD、总氮和总磷等污染物对沙溪水环境与微生物种群变化的关系进行了初步的研究.结果表明，各种微生物的数量变化与主要的有机污染物值之间存在显著的相关性 ...
谢文斐
core