检索结果-南通市图书馆

Harvesting of forest products and implications for Afrotemperate bird communities in a montane forest of the Eastern Cape, South Africa

引用

Forest Ecosystems 2019年第4期6卷 352-366页

作者： Jessica Leaver Johann C.Carstens Michael I.Cherry department of botany and zoology Stellenbosch University

Background: Harvesting of forest products is a widespread driver of disturbance in developing nations, where policies are increasingly aimed at managing natural forests for sustainable use. There is thus need for research aimed at understanding the impact of resource use on forest habitats and concomitant effects on *** forests in the Eastern Cape, South Africa are harvested informally for poles and medicinal bark and occur along elevational gradients of 800–1600 m above sea level. Patterns of spatial diversity and human disturbance are expected to be affected by elevation. Furthermore, species’ responses to disturbance are expected to vary depending on their level of habitat specialisation. Understanding harvest impacts on forest biodiversity thus requires disentangling the separate effects of elevation and disturbance, and considering forest-specialist and forest-generalist species separately. This study comprises two components. First, harvest activities, resultant harvestmediated habitat heterogeneity, and avifaunal species richness, composition and beta-diversity were compared across two elevational zones in a harvested forest. Second, the role of harvest-mediated habitat heterogeneity in driving patterns of avifaunal diversity were assessed, while controlling for elevation, and considering forest-specialist and forest-generalist species ***: Harvest rates were higher, and activities more varied in the lower elevation zone, with significant impacts of harvesting on habitat features resulting in higher harvest-mediated habitat heterogeneity at lower ***-mediated increases in habitat heterogeneity positively affected forest-generalist species richness, while forest-specialist richness was negatively affected. While species composition of both groups differed across elevational zones, variation in harvest-mediated habitat heterogeneity did not fully account for this, suggesting that factors other than disturbance

关键词： Human disturbance Habitat heterogeneity Habitat modification Beta-diversity Elevation Generalist species Forest-specialist species

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A fine-scale assessment of the ecosystem service-disservice dichotomy in the context of urban ecosystems affected by alien plant invasions

引用

Forest Ecosystems 2019年第4期6卷 323-338页

作者： Luke J.Potgieter Mirijam Gaertner Patrick J.O’Farrell David M.Richardson Centre for Invasion Biology Department of Botany and ZoologyStellenbosch University

Background: Natural resources within and around urban landscapes are under increasing pressure from ongoing urbanisation, and management efforts aimed at ensuring the sustainable provision of ecosystem services(ES) are an important response. Given the limited resources available for assessing urban ES in many cities, practical approaches for integrating ES in decision-making process are ***: We apply remote sensing techniques(integrating LiDAR data with high-resolution multispectral imagery)and combined these with supplementary spatial data to develop a replicable approach for assessing the role of urban vegetation(including invasive alien plants) in providing ES and ecosystem disservices(EDS). We identify areas denoting potential management trade-offs based on the spatial distribution of ES and EDS using a local-scale case study in the city of Cape Town, South Africa. Situated within a global biodiversity hotspot, Cape Town must contend with widespread invasions of alien plants(especially trees and shrubs) along with complex socio-political challenges. This represents a useful system to examine the challenges in managing ES and EDS in the context of urban plant ***: Areas of high ES provision(for example carbon sequestration, shade and visual amenity) are characterized by the presence of large trees. However, many of these areas also result in numerous EDS due to invasions of alien trees and shrubs – particularly along rivers, in wetlands and along the urban edge where tall alien trees have established and spread into the natural vegetation(for example increased water consumption, increased fire risk and reduced soil quality). This suggests significant trade-offs regarding the management of species and the ES and EDS they ***: The approach applied here can be used to provide recommendations and to guide city planners and managers to fine-tune management interventions at local scales to maximise the provision of ES.

关键词： Biodiversity Biological invasions Ecosystem disservices Ecosystem services Remote sensing Trade-offs Tree invasions Urban plant invasions

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Genes and proteins expressed at different life cycle stages in the model protist Euplotes vannus revealed by both transcriptomic and proteomic approaches

引用

Science China Life Sciences 2025年第1期 232-248页

作者： Yaohan Jiang Xiao Chen Chundi Wang Liping Lyu Saleh A.Al-Farraj Naomi A.Stover Feng Gao Key Laboratory of Evolution & Marine Biodiversity (Ministry of Education) and Institute of Evolution & Marine Biodiversity Ocean University of China Marine College Shandong University zoology department College of ScienceKing Saud University department of Biology Bradley University Laboratory for Marine Biology and Biotechnology Qingdao Marine Science and Technology Center

Sexual reproduction first appeared in unicellular protists and has continued to be an essential biological process in almost all *** protists, which contain both germline and somatic genomes within a single cell, have evolved a special form of sexual reproduction called conjugation that involves mitosis, meiosis, fertilization, nuclear differentiation, genome rearrangement, and the development of unique cellular structures. The molecular basis and mechanisms of conjugation vary dramatically among ciliates, and many details of the process and its regulation are still largely unknown. In order to better comprehend these processes and mechanisms from an evolutionary perspective, this study provides the first comprehensive overview of the transcriptome and proteome profiles during the entire life cycle of the newly-established marine model ciliate Euplotes vannus. Transcriptome analyses from 14 life cycle stages(three vegetative stages and 11 sexual stages) revealed over 26,000 genes that are specifically expressed at different stages, many of which are related to DNA replication,transcription, translation, mitosis, meiosis, nuclear differentiation, and/or genome rearrangement. Quantitative proteomic analyses identified 338 proteins with homologs associated with conjugation and/or somatic nuclear development in other ciliates, including dicer-like proteins, Hsp90 proteins, RNA polymerase Ⅱ and transcription elongation factors, ribosomal-associated proteins, and ubiquitin-related proteins. Four of these homologs belong to the PIWI family, each with different expression patterns identified and confirmed by RT-qPCR,which may function in small RNA-mediated genome rearrangement. Proteins involved in the nonhomologous end-joining pathway are induced early during meiosis and accumulate in the developing new somatic nucleus, where more than 80% of the germline sequences are eliminated from the somatic genome. A number of new candidate genes and proteins likely t

关键词：

来源：

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Behavioral thermoregulation is highly repeatable and unaffected by digestive status in Agama atra

引用

Integrative zoology 2018年第4期13卷 482-493页

作者： Jenna Van BERKEL Susana CLUSELLA-TRULLAS Centre for Invasion Biology Department of Botany and ZoologyStellenbosch UniversityMatielandSouth Africa

The precision and the extent of behavioral thermoregulation are likely to provide fitness benefits to *** the factors driving variation in selected or preferred body temperature(T_(set))and its usefulness as a proxy for optimal physiological temperature(Topt)are still *** T_(set)is often conserved among closely related species,substantial variation at the individual,population and species level has also been ***,the repeatability(calculated as the intra-class correlation coefficient)of T_(set)is generally *** factor that influences T_(set)is feeding status,with fed reptiles typically showing higher T_(set),a process thought to aid meal ***,using experiments simulating realistic feeding and fasting regimes in Agama atra,a heliothermic lizard from southern Africa,we test if T_(set)and its repeatability under these 2 states significantly *** T_(set)ranged from 33.7 to 38.4℃,with a mean(±SE)of 36.7±0.1℃ for fed and 36.6±0.1℃ for unfed *** of repeatability showed that females tend to be more consistent in the selection of body temperature than males,but not significantly so regardless of feeding *** report some of the highest repeatability estimates of T_(set)to date(full range:0.229–0.642),and that the weak positive effects of feeding status on T_(set)did not increase its *** conclusion,one of the major prerequisites for natural selection,consistent among-individual variation,is present,making the adaptive significance of T_(set)considerably more plausible.

关键词： climate change co-adaptation evolutionary potential inter-individual variation specific dynamic action thermal preference

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Antifertility effect of ethanolic extract of Amalakyadi churna in male albino mice

引用

Asian Journal of Andrology 2003年第3期5卷 247-250页

作者： Y.N.Seetharam H.Sujeeth G.Jyothishwaran Arvind Barad G.Sharanabasappa B.Umareddy M.B.Vijaykumar Saraswati B.Patil Biosyatematics and Medicinal Plants Laboratory Department of Botany Department of Zoology Gulbarga University Gulbarga-585106 India

Aim: To evaluate the antifertility activity of the ethanolic extract of Amalakyadi churna by oral administration in male albino mice. Methods: The ethanol extract of Amalakyadi churna at the dose of 250 mg/kg and 400 mg/ kg body weight was administered orally for 30 days to adult male mice. On day 31, the mice were sacrificed and the testis and accessory reproductive organs were removed and weighed. The organs were processed for biochemical estimation and histological work. Results: Treatment with Amalakyadi churna resulted in decrease in the weights of testis and accessory reproductive organs. The diameters of testis, seminiferous tubules and Leydig cell nucleus were decreased. The spermatogenic elements, like spermatogonia, spermatocytes and spermatids in the testis were reduced significantly as well as the sperm count in cauda epididymis. There was a significant reduction in the protein, glycogen, DNA and RNA contents and the activity of acid phosphatase in the testis of extract treated mice compared with the control. The cholesterol content and the alkaline phophatase activity were increased significantly in treated mice. Conclusion: Amalakyadi churna extract arrests spermatogenesis in male mice without noticeable side effects.

关键词： Amalakyadi churna testis accessory organs reproduction spermatogenesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ethno-medicinal plants used by Bengali communities in Tripura, northeast India

引用

Journal of Forestry Research 2014年第3期25卷 713-716页

作者： Joydeb Majumder Partha P. Bhattacharjee Badal K. Datta Basant K. Agarwala Ecology & Biodiversity Laboratories Department of Zoology Tripura University Plant Taxonomy & Biodiversity Laboratory Department of Botany Tripura University

Northeastern India has high medicinal plant diversity due to variance in topography and physiognomy. We documented the uses of various medicinal plants by the Bengali people of West district and South district of Tripura state for their own health care as well as for domesti-cated animals. Based on semi structured interviews, group discussions and information from local informants, a total of 93 species of medicinal plants of 52 families and 83 genera were documented. These plants were used to treat more than 55 different human diseases and 6 diseases of livestock. Sixty-eight plant species were used singly and the rest were used in combination with other species for therapeutic formulations of various diseases. Leaves of plants were most often used for most of the ethnobotanical preparations. Maximum consensus value of 96% was recorded for Chromolaena odorata （L.） King ＆amp;H. Rob., and the mini-mum was 15%for Bambusa balcooa Robx. Of the 93 plant species, 75 species showed pharmacological properties. Prospects for augmenting existing knowledge and enhancing the use of traditional medicinal plants are discussed.

关键词： ethnobotanical survey Bengali community traditionalknowledge Tripura state Northeast India

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Use of non-timber forest products from invasive alien Prosopis species(mesquite) and native trees in South Africa: implications for management

引用

Forest Ecosystems 2015年第3期2卷 197-207页

作者： Ross T Shackleton David C Le Maitre Brian W van Wilgen David M Richardson Centre for Invasion Biology Department of Botany and ZoologyStellenbosch University Centre for Invasion Biology Natural Resources and the EnvironmentCSIR

Background: Prosopis species have been introduced to many areas outside their native range to provide benefits to local communities. Several Prosopis species and their hybrids(hereafter "mesquite") have, however, become naturalised and invasive and now generate substantial costs. Management options are limited because of the complex conflicts of interest regarding benefits and costs. Management policies and strategies must take account of such conflicts, but further insights are needed on the dimensions of uses and impacts before such information can be usefully applied. Current policy in South Africa allows for the growth and use of mesquite in one province,but not in others where its control is mandatory. We report on a study to quantify the direct use and perceptions of non-timber forest products(NTFPs) from mesquite and native trees in South ***: Semi-structures household interviews were conducted with various stakeholder groups to identify what tree products are used, to ascertain amounts used as well as to gauge perceptions of natural resource use between different tree species and use over ***: The direct household use value of native trees was higher than that of mesquite, and local stakeholders attached greater value to products from native trees than from mesquite. Therefore, native trees are and will still be preferentially harvested, and mesquite is unlikely to offer protection to native species by providing an alternative source of products. Mesquite pods do, however, provide valuable additional resources(fodder and medicinal products). The use of both native trees and mesquite is decreasing as the incomes of poorer households rise and as alternative energy sources become available. The benefits and reliance on mesquite are not as high as previously assumed and the impacts from mesquite invasions create large problems for local ***: This study provides further evidence that the impacts of mesquite exceed the benefi

关键词： Biological invasions Conflicts of interests Cost v

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Biological activities of Solanum pseudocapsicum(Solanaceae)against cotton bollworm,Helicoverpa armigera Hübner and armyworm,Spodoptera litura Fabricius(Lepidotera:Noctuidae)

引用

Asian Pacific Journal of Tropical Biomedicine 2012年第12期2卷 981-986页

作者： Alagarmalai Jeyasankar Selvaraj Premalatha Kuppusamy Elumalai department of zoology & botany Arignar Anna Government Arts College Entomotoxicity Unit.department of zoology Government Arts College

Objective:To evaluate the antifeedant,insecticidal and growth inhibition activities of Solanum pseudocapsicum(***)seed extracts against Spodoptera litura(***)and Helicotverpa armigera(***).Methods:Hcxane,diethyl cther,dichloromethanc and ethyl acetate seed extracts were prepared and tested for autifeedant,insecticidal and growth inhibitory activities against fourth instar larvae of&litura and ***:Ethyl acetate extract showed promising antifeedant and insecticidal activities against *** and *** of deformed larvae,pupae and adults were maximum in treatment of ethyl acetate *** of successful adult emergence was deteriorated by seeds on extract treated ***:Ethyl acetate extracts of ***,showed higher efficiency of antifeedant,insecticidal and growth inhibition ***,it can be used to controll agricultural insect pests,*** and ***.

关键词： Solanum pseudocapsicum Helicoverpa armigera Spodoptera litura Antifeedant Insecticidal

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ethno-Medico-Biology of Bhadrak district, Odisha, India

引用

Journal of Forestry Research 2013年第1期24卷 187-192页

作者： T. Panda N. Mishra B. K. Tripathy P. K. Das R.B.Mohanty department of botany S.N.CollegeRajkanikaKendrapara- 754220OdishaIndia. department of zoology Chandbali CollegeChandbaliBhadrak-756133OdishaIndia department of botany Dharmasala MohavidyalayaDharmasalaJajpurOdishaIndia department of botany Aul CollegeAulKendraparaOdishaIndia department of botany N.C.Autonomous CollegeJajpurOdishaIndia

We carried out an ethno-medico-biological investigation in the interior of Bhadrak district, Odisha, India to explore the therapeutic use of traditional plants/animals by local inhabitants. The villagers and rural people used plant and animal species as medicine. We recorded therapeutic use of 18 plant species of 13 families and 12 animal species of seven taxonomic categories. Different plant/animal parts like bark, leaf, flower, seed, stem, root, whole plant, oil, blood, milk, urine and flesh were reported as used in raw or cooked form against 17 specific diseases. Prominent diseases treated by plant/animal remedies were asthma, cardiovascular ailments, diabetes, epilepsy, jaundice, malaria, skin disorder and rheumatism. This study provides a better database for future studies.

关键词： Ethnobiology folklore phytotherapy traditional knowledge zootherapy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Scanning the horizon for nascent environmental hazards

引用

National Science Review 2014年第3期1卷 330-331页

作者： Zhigang Jiang Keping Ma Institute of zoology Chinese Academy of Sciences Institute of botany Chinese Academy of Sciences

In retrospect,it becomes evident that many environmental and conservation problems could have been detected or prevented at their early ***,in most cases,the early warning signs of such environmental issues are neglected;thus,the chance to take timely action is lost and heavy damage oten *** of these cases have been identiied by the European Union[1].For example,the UK government failed to foresee pub-

关键词： Scanning the horizon for nascent environmental hazards

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：