Results 21 to 30 of about 688,354 (170)
Wildlife Letters, EarlyView.Reported annual per‐capita harvest of muskrats (PCHM) decreased as wetland complexity (total number of wetland patches) decreased in 13 state and federal wetland areas in the Midwest, USA. Our results support the hypothesis that regional‐scale declines in the abundance of muskrats are likely associated with the losses to wetland habitats throughout the
Tim L. Hiller +5 more
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Journal of China and International Relations, 2019 2019是中国国家主席习近平提出共同、综合、合作、可持续安全观5周年。拙文首先就中国提出可持续安全观5年来，在国家决策、政策宣誓、国际认同方面取得的进展做一概要的总结；然后分析当前全球安全治理方面面临的挑战；在此基础上探讨21世纪全球安全治理的出路，将可持续安全观与气候变化问题、朝鲜半岛前景等国际安全治理的实际问题相结合，创造性地提出新的安全范式及解决问题的具体措施。 【关键词】可持续安全；全球治理；国际安全；气候变化 ...
Liu Jiangyong
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Wildlife Letters, EarlyView.This study investigates the breeding success of the critically endangered White‐rumped Vulture in Khaireni Community Forest, and examines local knowledge and perceptions toward its conservation. We found that 71% of active nests were successful, with breeding success significantly influenced by the proximity to carcass deposition sites.
Siddhartha Regmi +4 more
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Wildlife Letters, EarlyView.We staged dyadic interaction trials between two kangaroo rat species threatened by habitat loss to test whether one species dominates in direct interactions in the field. We found that Stephens’ kangaroo rat (Dipodomys stephensi) residents and intruders were dominant over Dulzura kangaroo rat (Dipodomys simulans). These results suggest that D. simulans
Janine N. Straughan +2 more
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Oxygen supply capacity (α) is a physiological trait hypothesized to shape the metabolic niche and biogeography of aquatic breathers, yet how natural selection targets α remains unclear.
Na Zhang +6 more
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Zhejiang Daxue xuebao. Lixue ban, 2003 可持续发展系统是"黑箱",至少是"灰箱",各因素间是否存在因果关系还不十分清楚,人工神经网络可以较为逼真地模拟该系统.本文以人工神经网络BP模型为工具,借助Matlab语言对区域可持续发展经济子系统指标进行预测研究.通过数据采集、网络结构模型设计、程序设计、网络训练等绘出指标预测图并进行分析,最后提出建议.结果表明,用人工神经网络来模拟可持续发展经济子系统是可行的.
YEZheng-bo(叶正波)
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When and why to give shorebirds a head start
Conservation Biology, EarlyView.Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
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Shuitu Baochi Xuebao, 2004 土地资源可持续利用是可持续发展战略的重要基础。重庆三峡库区土地资源可持续利用是维护库区生态环境,保证库区经济健康、高速发展的前提条件。库区移民安置区是整个库区经济最活跃、土地承载压力最大、生态最敏感的区域。本文在分析库区移民安置区土地利用特征、社会经济现状和生态环境条件的基础上,评价了该区域土地资源可持续利用的综合水平,系统阐述了土地资源可持续利用的限制因子和产生原因。安置区土地资源可持续利用的主要限制因子有社会经济发展水平和产业结构差距、土地资源利用优化配置水平、城镇化发展水平、资源环境问题 ...
周宝同 高明 谢德体 魏朝富
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Institutional lessons from the Nordic management model
Conservation Biology, EarlyView.Abstract To improve wildlife management outcomes, in terms of reaching management goals and increasing legitimacy, Nordic countries have developed institutional systems involving stakeholders that aim for a more inclusive and participatory model.
Jens Nilsson +2 more
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Zhongguo youzhi旨在寻找兼具产油和纤维素降解能力的菌株以有效降低发酵成本，进而促进产油微生物的应用。通过苏丹黑B染色法筛选印度血桐种仁中具有产油能力的内生菌，并通过刚果红筛选法初筛、滤纸条崩解实验和产纤维素酶活力测定复筛纤维素降解能力较强的菌株，采用单因素试验对其发酵条件进行优化，并对其产油脂主要脂肪酸组成进行测定。结果表明，印度血桐种仁中共筛选出6株兼具产油能力和纤维素降解的菌株，其中Mi007号菌株的透明圈直径与菌落直径比值（3.16）较大，滤纸崩解情况最佳，产纤维素酶活力（1233 U/mL）最高 ...
李浩1,2,孟加梅3,郭娟1,田波1 LI Hao1,2, MENG Jiamei3,GUO Juan1，TIAN Bo11.Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223， China; 2.University of Chinese Academy of Sciences, Beijing 101408, China; 3.Pu′er Tea College, West Yunnan University of Applied Sciences，Pu′er 671006，Yunnan，China
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