Results 51 to 60 of about 1,274,438 (219)
The obsolescence of protected area categories in a polycrisis world
Conservation Biology, EarlyView.Abstract Current global conservation models face significant limitations in addressing the global polycrisis, and the constraints of the International Union for Conservation of Nature protected area (PA) classification system are part of the issue. The principles of the new conservation paradigm—governance, equity, and interculturality—are not viable ...
Pamela Esther Degele
wiley +1 more source
仿生模式识别（拓扑模式识别）－－一种模式识别新模型的理论与应用
, 2002 本文提出了一种模式识别理论的新模型，它是基于“认识”事物而不是基于“区分”事物为目的。与传统以“最佳划分”为目标的统计模式识别相比，它更接近于人类“认识”事物的特性，故称为“仿生模式识别”。它的数学方法在于研究特征空间中样本集合的拓扑性质，故亦称作“拓扑模式识别”。“拓扑模式识别”的理论基点在于它确认了特征空间中同类样本的连续性（不能分裂成两个彼此不邻接的部分）特性。文中用“仿生模式识别”理论及其“高维空间复杂几何形体覆盖神经网络”识别方法，对地平面刚体目标全方位识别问题作了实验 ...
王守觉
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Early outcomes of England's new biodiversity offset market
Conservation Biology, EarlyView.Abstract Nature markets are being operationalized as a tool to address the biodiversity finance gap and achieve global biodiversity targets. However, there is limited understanding of how the outcomes of these markets align with biodiversity targets.
N. E. Duffus +3 more
wiley +1 more source
野生动物学报, 2018 蛇类养殖可以缓解野外资源的开发压力,起到积极的保护作用。但是从野外非法捕捉的蛇类以人工养殖之名混入合法市场的现象也十分常见。由于缺乏有效鉴别野生和人工饲养蛇类的方法,给监管市场和打击盗猎、非法贩卖等违法犯罪行为带来困难。本研究以养殖量和盗捕量较大的王锦蛇为例,建立了肝-头指数(Ilh)和肝-体指数(Ilb)两个肝脏指数来鉴别野生和人工饲养蛇类。利用这两个指标,采用Fisher's判别将已知来源的个体进行来源回判时,两个指标的正确判别率相同,在野生组均为96.9%,饲养组均为74.1%,整体正确率为86 ...
林 煜 田静茹 崔 杰 李 力 徐艳春 杨淑慧
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Protected areas on international borders show uneven conservation outcomes
Conservation Biology, EarlyView.Abstract Border protected areas (BPAs) are national protected areas that are immediately adjacent to a country's border or span two or more countries; they are characterized by distinctive opportunities and pressures. They play a critical role in protecting carbon‐rich ecosystems, conserving endangered biodiversity, reducing cross‐border environmental ...
Rachakonda Sreekar +10 more
wiley +1 more source
Conservation Biology, EarlyView.Abstract Global farmland biodiversity is declining rapidly, threatening both natural ecosystems and agricultural production. Although agri‐environmental schemes incentivize farmers to adopt environmentally friendly measures, the spatial mismatch between their local implementation and the landscape‐scale habitat requirements of farmland species has been
Annika L. Hass +5 more
wiley +1 more source
, 2006 采用改进的访谈方法,考察了3、4、5、6岁儿童的性别恒常性的发展。结果表明:3、4岁儿童已获得性别认同的能力,4、5岁儿童逐步获得性别稳定性的能力,5、6岁是性别一致性发展的快速期,大多数的6岁被试儿童已获得性别恒常性。研究还发现,在提示条件下,各年龄获得性别恒常性的被试人数大大增加;儿童对自己的性别恒常性的认知发展早于对他人 ...
范珍桃, 方富熹
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野生动物学报, 1991 对随机抽取的388号黄羊（Procapra gutturosa）某些指标（牙齿生长替换及磨损度、I牙冠比、体重、前臂长、后足长、尾长、眶间宽、身长、头长）与性别、年龄相关性的分析表明:前面项指标无显著性性别差异,且与年龄显著相关,可以单独作为年龄鉴定指标;后七项指标具显著性性别差异,与年龄关系不密切,只能用于区分成幼或3.5岁以前的年龄鉴别。另外发现高龄个体的牙齿磨损速度有降低的趋势,性成熟年龄雌性有超前雄性一年的趋势。
姜兆文, 徐利, 郑红
doaj
A framework for integrating resilience indicators into risk assessments
Conservation Biology, EarlyView.Abstract Globally, ecosystems are increasingly threatened by climate change and human pressures, yet ecosystem risk assessments predominantly emphasize exposure to stressors while overlooking intrinsic ecosystem resilience—the capacity to absorb and recover from disturbances.
Benoît Pichon +4 more
wiley +1 more source
野生动物学报, 2020 性别鉴定对鸟类种群动态、群落结构、栖息地利用以及行为研究都具有重要作用。除了自然选择与性选择，亲缘关系被认为与是否存在性二态有关。白头鹎（Pycnonotus sinensis）与领雀嘴鹎（Spizixos semitorques）隶属于鹎科（Pycnonotidae）不同属，是探讨亲缘关系与性二态差异之间相关性的适宜对象，二者在野外都难以从形态区分性别。本研究以分子为基础，对比同域分布的白头鹎和领雀嘴鹎雌雄个体间在形态上是否存在显著差异。结果表明白头鹎指名亚种在枕部白色斑块面积和尾羽具明显的性二态 ...
曾煜 1 李贺 2 逯金瑶 3 向晨旭 1 李翔 1 付昌健 1 李立 3 邢晓莹 1
doaj