Results 51 to 60 of about 107,409 (290)
Fluctuating salinity during development impacts fish life histories
Journal of Animal Ecology, EarlyView.Global freshwater ecosystems are increasingly threatened by salinisation. Salinity levels not only rise but also fluctuate due to extreme climate events and human activities. This study shows that stable elevated salinity accelerates reproduction in a freshwater fish, but fluctuations in salinity reduce reproductive output, with sex‐specific effects on
Meng‐Han Joseph Chung +4 more
wiley +1 more source
Cost-effective Solutions of Nitrogen Reduction in Enclosed Bay: Case Study of Sansha Bay, Fujian Province [PDF]
, 2016 由于污染物过度排放导致环境质量下降和生境退化是目前全球很多海湾面临的重要挑战，而总氮、总磷等营养盐是造成海湾水体污染和生境退化的主要原因之一。营养盐削减，特别是通过海岸带湿地修复进行营养盐削减不仅可以缓解水体富营养化改善水质，还可以达到改善海湾生境的质量的目的。由于来源的多样性和复杂性，营养盐削减需要大量的成本。在需要解决的环境问题日益增多而预算有限的约束下，研究达到预定的环境目标、成本最低的营养盐削减方案是当务之急。不同地区、不同营养盐削减措施的成本不同，同时，不同地区 ...
徐瑞琦
core
Global drivers of the conservation–invasion paradox
Conservation Biology, EarlyView.Abstract The conservation–invasion paradox (CIP) refers to a long‐term phenomenon wherein species threatened in their native range can sustain viable populations when introduced to other regions. Understanding the drivers of CIP is helpful for conserving threatened species and managing invasive species, which is unfortunately still lacking. We compiled
Yanhua Hong, Zhiyong Yuan, Xuan Liu
wiley +1 more source
, 2012 沉积物疏浚是削减富营养化湖泊内源负荷的最为直接和有效的手段。分析了沉积物疏浚的效果和可能引起的风险;从外源污染、作业区域和深度、沉水植物3个方面探讨了影响沉积物疏浚效果的关键因素。最后指出,富营养化湖泊沉积物疏浚的重要原则是截断外源污染、划分作业区域、合理控制挖掘深度、创造适宜生境、恢复沉水植物 ...
刘华丽 +3 more
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野生动物学报, 2014 生境破碎化是指由于人类活动或自然因素引起生境变化的一个生态过程。生境破碎化是生态学和保护生物学中较新的理论,已成为保护生态学、景观生态学和保护生物学研究领域中备受关注的热点问题之一。本文介绍了生境破碎化的基本概念、主要特点,以及生境破碎化在种群、群落、生态系统和景观层次引起的生态效应,概括了生境破碎化在形式上和功能上的主要表现。同时综述了生境破碎化研究的起源、发展和在森林采伐、道路及边缘效应3个主要方面的研究进展,并着重探讨了生境破碎化:(1)对野生动物生物多样性保护带来的生态效益;(2 ...
张明海 马建章
doaj
Conservation benefits of a large marine protected area network that spans multiple ecosystems
Conservation Biology, EarlyView.Abstract Marine protected areas (MPAs) are widely implemented tools for long‐term ocean conservation and resource management. Assessments of MPA performance have largely focused on specific ecosystems individually and have rarely evaluated performance across multiple ecosystems either in an individual MPA or across an MPA network.
Joshua G. Smith +23 more
wiley +1 more source
The scale-up fermentation of DAM and preliminary study of DAM-induced apoptosis in HeLa cells [PDF]
, 2015 丰富的海洋生物资源为天然产物提供了重要来源，红树内生真菌由于独特的生理和代谢系统，产生了一些新颖独特的次级代谢产物。去乙酰真菌环氧二烯（Deacetylmycoepoxydiene，DAM）是本课题组杨丽珊同学从红树植物秋茄内生拟茎点霉属真菌A-1-2-3次级代谢产物中分离得到，具有新颖的含氧桥结构骨架，前期实验表明，该化合物具有较强的抗肿瘤活性。 本论文通过对菌株发酵技术参数的优化，确立了DAM液体发酵放大的工艺控制流程并进行了规模制备，初步阐明了DAM的抗肿瘤作用及其诱导HeLa细胞凋亡的作用机制 ...
林鹏
core
Floristic analysis of the seed plants from Yandang Mountain of Yueqing, Zhejiang(浙江乐清雁荡山种子植物区系分析)
Zhejiang Daxue xuebao. Lixue ban, 2018 在文献查阅、野外调查和标本鉴定的基础上，对浙江乐清雁荡山种子植物区系特征进行了统计分析，得到：(1)区域内共有野生种子植物732种（含种下类群），隶属147科、433属；科、属水平显示出多样性，含1个种的科和属分别占总科数和总属数的41.5%和67.9%. (2)科的分布区类型中，热带成分有64科，占总科数的42.9%，温带成分共36科，占24.6%；属的分布区类型中，热带成分和温带地理成分分别占总属数的49.1% 和50.9%，泛热带分布及其变型所占比例最大，为24.1%.
CHENWeijie(陈伟杰) +3 more
doaj +1 more source
Opportunities, research gaps, and risks in allogenic ecosystem engineer mimicry
Conservation Biology, EarlyView.Abstract In an age of anthropogenically driven species loss and increasingly novel ecosystems, ecosystem engineer restoration is a process‐based approach to supporting ecosystem function. Many ecosystem engineers have low or declining population sizes.
Brandi Goss +2 more
wiley +1 more source
Study on the seasonal dynamics of small mammals in Jinhua City(金华城区小型兽类数量季节消长的研究)
Zhejiang Daxue xuebao. Lixue ban, 2002 自1997年1月至1999年12月,选择金华城区的居民区、宾馆、粮库和工厂等4种生境5个调查点,每月以夹夜法对小型兽类数量的季节消长进行研究.结果表明,金华城区褐家鼠(Rattus norvegicus)的捕获率为0.58%、黑线姬鼠(Apodemus agrarius)0.26%、臭鼩鼱(Suncus murinus)0.24%、黄胸鼠(Rattus flavipectus)0.12%、小家鼠(Mus musculus)0.05%;捕获率的季节消长呈现以6月和9月为高峰的双峰型曲线 ...
BAOYi-xin(鲍毅新) +3 more
doaj +1 more source